[Qgis-user] File Descriptor Limits in Linux

[Patrick Dunford via QGIS-User]

Good day

For many years it has been known that applications such as Qgis running 
under the Linux operating system have been subject to configuration of 
maximum number of file descriptors for open files. Generally the default 
is set to something like 1024 and will affect Qgis projects with more 
than 1024 layers.


There are currently two limits in Linux that may affect users of Qgis 
with a large number of layers in their project. These can be checked 
using the ulimit -n command which will display the maximum number of 
open files permitted in the current configuration.


1. PAM session limits are configured in the file /etc/security/limits.conf

2. On some distros, the limits also have to be separately configured for 
systemd.


Ubuntu up to and including 22.04 requires only step 1 to be completed.

Debian 12 on the other hand requires step 2 to be completed. It is not 
clear if this is a requirement on any other releases of Debian. However 
experience suggests this step has not been a requirement on most earlier 
Debian releases.


The specifics as far as I can determine for step 2 suggest that a .conf 
file is placed in the following path:


/etc/systemd/user.conf.d

This file can be any name chosen by a user (e.g. limits.conf). The file 
was copied from the user.conf file placed in /etc/systemd and it is also 
the case that editing this user.conf file in its default path would have 
the same effect, however the subdirectory usage is recommended.


This file must at a minimum contain the following:

[Manager]

DefaultLimitNOFILE=xx


This is a per-user limit and it does not apply to the root user. There 
is a different procedure for the root user, which I do not have 
documentation for. The result of ulimit -n run under a root shell will 
display a different result from running it as a non-root user.




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Re: [Qgis-user] Georeferencing Raster

[Patrick Dunford via QGIS-User]

When you are replying to a digest, kindly observe standard netiquette 
and only quote the part of the digest message that is relevant to the 
discussion.


Any activity that involves processing raster images is by definition 
much more resource intensive than editing vector layers. When you are 
drawing maps, most of the layers you are likely to be working with are 
vectors. It is inevitable your system will be much more impacted in 
performance when processing the raster data than it is for drawing 
vector layers. The onus is basically on you to ensure you are using a 
computer system that has good performance specifications.


On 18/03/24 20:28, Bodamer, Christian via QGIS-User wrote:

Hello Michaela,

sometimes I have the same problem with PDF files. In such cases I change PDF to 
TIFF or png etc. with 150 dpi.

Best regards,
Christian
Die Autobahn GmbH des Bundes
Niederlassung Ost
Magdeburger Straße 51 · 06112 Halle

Christian Bodamer
Landschaftsplaner Verwaltung A- und E-Flächen
M +49 1525 76 54 493
T + 49 345 9409 9459
christian.boda...@autobahn.de
http://www.autobahn.de/

--

Message: 3
Date: Fri, 15 Mar 2024 07:03:32 +
From: "Huesmann, Michaela" 
To: "qgis-user@lists.osgeo.org" 
Subject: [Qgis-user] Georeferencing Raster
Message-ID: <77500f54d9bb4515a69f646d86a9d...@stadt-steinfurt.de>
Content-Type: text/plain; charset="utf-8"

Hello all,

my collegue got some trouble with georeferencing raster images. As soon as he 
activates the tool  ?LAYER >> GEOREFERENCING? his system gets very, very 
slw. It takes plenty of time even to open the raster image and then to set 
referencing points. While changing the windows between Map and Referencing Tool the 
windows are getting grey and show ?No response?. In the end he doesn?t know wheter 
the system is still running or ?died? along the way.
I installed QGIS Version 3.34.4 now, but it ist he same behaviour as in hil 
older version 3.16.
Is there maybe a special setting, that can be changed to get a better 
performance?

Best regards, Michaela



[Kreisstadt Steinfurt]

  - 48565 Steinfurt


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Re: [Qgis-user] Decoration Grid / drawing tools

[Patrick Dunford via QGIS-User]

Oh OK. Well I had no idea those capabilities had been added in Qgis, 
though I do recall a user group conversation about having that type of 
capability some years ago. It looks someone has put a good work in place 
to have that capability added in the software, so thanks to the group 
and all the developers for your assistance in this matter.


On 31/01/24 12:56, Andrea Giudiceandrea via QGIS-User wrote:

Patrick Dunford enzedrailmaps at gmail.com
Tue Jan 30 01:56:23 PST 2024


So the best I can work out of how to digitise this shape is being 
able to align to the grid in some way perhaps with some kind of 
snapping to the grid or alignment to the grid or being able to see 
the angles on each corner or whatever. I am not sure how to achieve 
that at the moment.


Hi Patrick,
have you tried to use, as already adviced, the Advanced Digitizing 
tools [1]?


You can find online various tutorials: see e.g. one at random [2].

Best regards.

Andrea

[1] 
https://docs.qgis.org/3.34/en/docs/user_manual/working_with_vector/editing_geometry_attributes.html#the-advanced-digitizing-panel
[2] 
https://www.geodose.com/2022/08/qgis-tips-tricks-how-digitize-perfect-building-footprint.html

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[Qgis-user] Decoration Grid / drawing tools

[Patrick Dunford via QGIS-User]

Good day all

I note there is a canvas grid that can be turned on by going to View -> 
Decorations -> Grid. However the rotation of this appears to be fixed to 
north/south/east/west and does not appear to have any provision to be 
changed in rotation in any form, such as for example aligning to the 
four sides of the window.


Is there an option to do this or some setting that I have missed that 
would enable this?


Alternatively is there any kind of plugin available that would provide 
the required functionality?


Second issue is drawing tools. When I am tracing building outlines I 
want to be able to draw exact right angles with the sides of the 
building, which is easy using the rectangle digitising tool for regular 
rectangles, but not so easy when the the building has more than four 
corners in which case it is easier to draw by hand but I need some way 
of snapping the corners to exact 90 degree angles, Here I'm assuming the 
grid cannot be rotated as queried in my first question.


Supposing that plugins might provide additional tools to help achieve 
this, in the opinion of users of this group, which of these plugins 
could provide the best functionality?


Thanks.

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[Qgis-user] zoomToLayers pyqgis

[Patrick Dunford via QGIS-User]

Good day to all

I want to call zoomToLayers in a pyqgis script to zoom the map canvas to 
a layer which I have just applied a filter to. I am not sure how to do 
it as all the documented uses of this method seem to apply to different 
things than to a layer.


If the layer is not the currently active layer is there a method of this 
that can be called on a particular layer or selecting a particular layer 
as active then using the call that uses the active layer.


e.g.

project =QgsProject.instance()

layer = project.mapLayersByName("Live Aerial Footprints")[0]

layer.setSubsetString(aerialFilter)

# insert code here to zoom to this layer



Thanks

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Re: [Qgis-user] v.net.salesman

[Patrick Dunford via QGIS-User]

This package appears to be part of the GRASS software, not specifically 
Qgis. You should direct support requests to the GRASS user community, 
not the Qgis one.



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[Qgis-user] Vector tiles export from processing toolbox

[Patrick Dunford via QGIS-User]

Good day to all

I have used the processing tools to create XYZ raster tiles from my maps 
quite a lot and going through the rest of what is in there I see a tool 
to create vector tiles as well. Guessing this might use the GDAL MVT 
driver to create these tiles.


What is different about vector tiles is having to specify styles for 
them to be rendered in the client browser and I felt there is probably 
not a straightforward way of translating existing Qgis layer styles into 
whatever the style specifications are for Mapbox vector tiles, so as I 
use a lot of different styles on my source layers it might be a case of 
having to set them all up again for vector tiles? Any idea?


Thanks

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Re: [Qgis-user] Possible bug?

[Patrick Dunford via QGIS-User]

Yes it does look like the support for extensions in some of the Linux 
libraries is a bit illiterate.  It would seem like since extensions are 
not actually required in Linux that the library creators have not fully 
understood how to handle them. Certainly notice issues with Gimp.


On 23/07/23 21:34, Nyall Dawson via QGIS-User wrote:



On Sun, 23 July 2023, 5:39 pm Richard Duivenvoorde via QGIS-User, 
 wrote:


Hi Roxo,

You are right, I can confirm this with a very recent build of QGIS:

- with extension we ask for confirmation of overwriting
- without extension we silently overwrite an old file


It's actually an operating system (well, gtk library) issue. The same 
thing happens in other apps too on that same platform.


Nyall


Please file an issue (https://github.com/qgis/QGIS/issues), this
seems easily fixable.
See

https://qgis.org/en/site/getinvolved/development/bugreporting.html#bugs-features-and-issues

Regards,

Richard Duivenvoorde

On 7/22/23 20:21, Fernando M. Roxo da Motta via QGIS-User wrote:
>
>
>    Hi all,
>
>    Today I was exporting some QGis projects as PNG images
> (project>import/export>export map to image).  At certain point I
made
> a mistake and repeated the name of the previous map, and QGis
happily
> overwrote the previous image, without asking before. I tried to
repeat
> the action giving the full name of the file (map10.png) and QGis
asked
> for confirmation.    The difference was that the first time I
gave jjust
> a name, without the "extension" .png.
>
>    It seems that even if QGis will give the default "extension"
to the
> filename, it does not verify the prior existence of the file
after it
> attach the "extension".
>
>    This was in a QGis 3.26.0 on Linux Xubuntu 20.04.  I know
that both
> the QGis and system are kind of old, but if this "feature" is
present
> in current versions it can be cumbersome.
>
>
>
>    Roxo
>

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Re: [Qgis-user] pegged CPU and vast RAM usage saving Layer Definition File

[Patrick Dunford via QGIS-User]

I use QLR files quite often and have never had any problems creating 
them. I have a Python script that reads them to copy the files listed in 
the QLR between directories and it always works flawlessly. The layers 
are all rasters 4800x7200 pixels.


On 21/06/23 04:27, Greg Troxel via QGIS-User wrote:
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Re: [Qgis-user] Issue with QgsLayerTreeNode.itemVisibilityChecked

[Patrick Dunford via QGIS-User]

Strange, I thought I had already tried that.

Thanks!

On 23/05/23 15:47, David Strip wrote:

On 5/22/2023 7:44 PM, Patrick Dunford via QGIS-User wrote:


extentGroup = root.findGroup(extentGroupName)
extentLayers = extentGroup.children()
for extentLayer in extentLayers:
    if extentLayer.itemVisibilityChecked:
        print (extentLayer.name()) 


shouldn't that be
 if extentLayer.itemVisibilityChecked():
(note the addition of parens after the method name).___
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[Qgis-user] Issue with QgsLayerTreeNode.itemVisibilityChecked

[Patrick Dunford via QGIS-User]

Good day

I am using a python script running in the Qgis scripting console to read 
a list of layers in the table of contents and it is supposed to be able 
to find out which layer's visibility check box is checked or not by 
calling the method itemVisibilityChecked.


So I have a top level group in the layer tree whose name is specified in 
a constant called extentGroupName and I am using the piece of code shown 
below to evaluate which of the layers in the group have their check box 
checked or not:


extentGroup = root.findGroup(extentGroupName)

extentLayers = extentGroup.children()

for extentLayer in extentLayers:

    if extentLayer.itemVisibilityChecked:

        print (extentLayer.name())

When I run this code it always prints the name of every layer in the 
group (I can see that it has the names right so that clearly these layer 
names have come from that group) but it is clear that the state of the 
checkbox is always found to be checked as far as the script is concerned 
so it ignores whether it is actually checked or not and always returns 
True as the result of calling the method itemVisibilityChecked.


I can't see if there is anything wrong in my code and so it appears 
there is a bug in that it always returns True for the method 
itemVisibilityChecked regardless of what it is actually set to.


Qgis 3.28, Linux (both flatpak and LTS deb packages tested)

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[Qgis-user] Github Access Problems

[Patrick Dunford via QGIS-User]

Good morning Qgis project admins

In recent times I am unable to sign in to Github to access the Qgis 
project resources there. This is because Github has mandated two factor 
authentication for sign-in, and the verification codes they send me by 
email are never delivered. (Yes, I have checked my spam folders)


I believe it's well known in the IT industry that Microsoft and Google 
do not cooperate well when it comes to email delivery. Over many years 
when having stuff emailed from a Microsoft account to a Google account, 
the messages are generally very slow to be delivered.


I have not had any problems with logging on to Github in the past but 
now that MS have taken it over and fully integrated it to their 
operations, now that I guess Microsoft's servers are delivering emails, 
it seems like we are back to square one on slow or non existent email 
delivery.


I also note that until recently I was able to use my Github account to 
sign in to Gnome's Gitlab instance, but not anymore. Gnome stopped 
accepting Github login credentials on their site, saying there had been 
spam problems.


I understand a lot of organisations have migrated off Github since 
Microsoft took it over for various reasons. I do not know if the Qgis 
project has considered this option, but it seems to me that there is 
nothing I can do to solve what appears to be ongoing issues between MS 
and Google and therefore there is no obvious other solution to address 
the problems I have with my login, other than changing to a non-Google 
email account.


Regards


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Re: [Qgis-user] Issue with displaying all rows in the attribute table in QGIS

[Patrick Dunford via QGIS-User]

What kind of layer are you accessing? I never see this issue on the 
layers I use.


On 29/03/23 22:01, Pinkal Sanoria via QGIS-User wrote:

Hi Team,
I am writing to report an issue with QGIS that I have encountered 
recently. Specifically, I have noticed that when I open the attribute 
table for a layer in QGIS, it only displays a maximum of 99 rows. This 
is problematic for me as I often work with layers that have more than 
99 features.


Name Pinkal,
Hanoi
Thanks

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Re: [Qgis-user] [EXTERNAL] Re: Geopackage slow on NAS if not read-only

[Patrick Dunford via QGIS-User]

I haven't checked to see if it can be installed on Home as I have a 
Win10Pro computer.
However I do not recommend the NFS client for Windows since it is not 
native and tricky to set up. I would not have any certainty about its 
performance.
My Windows 10 computer is usually connected to the rest of my network 
using the inbuilt SMB support to a separate Samba server running on the 
host alongside NFS.


On 19/03/23 10:02, David Strip wrote:

On 3/18/2023 1:50 PM, Patrick Dunford via QGIS-User wrote:

but I use NFS, which is not available on Windows (my computers run Linux)


NFS is available on Win 10 and 11 in the Pro and Enterprise versions, 
but not the Home version.

I think it is not on by default, however.

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Re: [Qgis-user] [EXTERNAL] Re: Geopackage slow on NAS if not read-only

[Patrick Dunford via QGIS-User]

I would not contemplate using NFS on Windows as NFS support is not 
native in Windows. It could create a lot of other issues. It is easier 
for me in my situation to connect my single Windows computer to my 
network via a separate Samba share.


Best outcome is to change working practices as per other comments.

On 20/03/23 21:59, Árni Geirsson wrote:
Thank you all who have responded over the weekend with helpful 
suggestions. I wish I could use Linux on all the office computers but 
that is not realistic. But what I have now learned is that a) I could 
try NFS on Windows and b) there might be some hope in tweaking Samba. 
Both are interesting threads to pursue.
If it is true that the problem with geopackages/sqlite that I raised 
in the beginning does not exist when shared under NFS, I have to 
conclude that there is some bad chemistry between Samba and sqlite. 
Maybe that is something the sqlite developers can resolve.


Árni


On Sat, 18 Mar 2023 at 21:07, David Strip via QGIS-User 
 wrote:


On 3/18/2023 1:50 PM, Patrick Dunford via QGIS-User wrote:

but I use NFS, which is not available on Windows (my computers
run Linux)


NFS is available on Win 10 and 11 in the Pro and Enterprise
versions, but not the Home version.
I think it is not on by default, however.
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Re: [Qgis-user] [EXTERNAL] Re: Geopackage slow on NAS if not read-only

[Patrick Dunford via QGIS-User]

Thanks for this.

You've helped convince me I need to keep a big cabinet with a row of 
"huge" tower chassises in it to store all my map data instead of forking 
out to get one of those wee little NASs and save a bit of space :)


using Linux on my computer and NFS for networking when I need to open 
files on a different computer because the usual one is having some sort 
of problem.


lol

On 17/03/23 03:39, jhubbslist--- via QGIS-User wrote:
You'd only be "living with it" because you choose to use the wrong 
tools for the work and refuse to use the right ones. In this case, I 
see the "wrong tools" here as 1) network-shared files for common r/w 
access 2) the SMB/CIFS protocol in general 3) appliance-type file 
servers are trash. You can try to make things better by standing up a 
proper Linux-based file server and using NFS instead of SMB/CIFS but 
1) is enough of a problem that you'd only be throwing good work after 
bad.


If it suits your use cases, you might try implementing something like 
git - which is after a fashion just another networked file-sharing 
protocol - and use check-out/check-in controls to make changes to 
centrally-stored files but this means you'll be slinging entire copies 
of your datasets down to client machines on the regular; that may not 
work well for you.


The best answer is PostgreSQL/PostGIS and that's going to take some 
time and effort. Cost of doing business.




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Re: [Qgis-user] [EXTERNAL] Re: Geopackage slow on NAS if not read-only

[Patrick Dunford via QGIS-User]

I access files over a network and haven't really noticed a speed issue, 
but I use NFS, which is not available on Windows (my computers run Linux)


there are other file formats, geopackage is not the only one out there - 
spatialite also uses SQLite.



On 17/03/23 03:08, Árni Geirsson via QGIS-User wrote:
I do appreciate the good advice to use DBMS, I am doing that too and 
understand the advantages. I would never consider using a geopackage 
if I thought that multiple people would want to edit them at the same 
time. But that is not the case and that is not my problem. Sometimes, 
I just want to keep geodata in a file on a network share and run the 
risk (in my case insignificant) that the file will be corrupted by 
multi user access. This I can do with shapefiles, but unlike the 
shapefiles, I have to set the read-only flag on the geopackages stored 
on the network to get decent rendering speed, without ever wanting to 
edit the files. I think wanting to use file based storage for geodata 
in a networked environment is not unreasonable, even if there is some 
danger of corruption. All file based formats are probably subject to 
that risk, but I repeat, that issue is not what I am talking about, 
just the rendering speed of data in a geopackage that is not set to 
read-only.
I suspect that there is no solution and that I will just have to live 
with this - as I have done for years. It is just a bit annoying. And I 
am surprised how little it is discussed.


Árni
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Re: [Qgis-user] [EXTERNAL] Re: Geopackage slow on NAS if not read-only

[Patrick Dunford via QGIS-User]

there is such a system. It is called a client server DBMS. Apart from 
the fact they are designed to handle multiple users, they can also 
economise on network traffic by splitting the workload between the 
client and the server.


On 17/03/23 01:33, Sebastian Gutwein via QGIS-User wrote:
This is all beyond my expertise but I have also struggled with the 
effective use of gpkg’s. In my case over google drive.
Here is what SQLite (the underlying software for gpkgs) says about 
using a SQLite database on a network:

https://www.sqlite.org/useovernet.html

I hope that someday someone implements a system that allows this to 
work efficiently as gpkgs are better in many respects than shapefiles. 
Perhaps Geodiff could be part of that solution.



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Re: [Qgis-user] [EXTERNAL] Re: Geopackage slow on NAS if not read-only

[Patrick Dunford via QGIS-User]

To share files over a network there has to be specific provision in the 
software design. Sqlite is designed for single user situations. It is 
not a full DBMS.


It would not be recommended to share shapefiles for multi user since it 
is still a file based system. To handle multiple users accessing the 
same file or data the software has to be able to break the file into 
units that can be managed for multiple users. This is part of the design 
of DBMS, but not in the case of most types of files.


On 17/03/23 01:04, Árni Geirsson via QGIS-User wrote:

Hi Jorge
I understand what you are pointing at and I use databases such as 
Postgres/PostGIS also with good results. The thing is that working 
with data in files sometimes has advantages and that is certainly how 
shapefiles have been used. The geopackage has been suggested as a 
replacement for the shapefile in the context of regular QGIS 
usage without any caveat saying that geopackages only replace the 
storage and transfer role of shapefiles and that geopackages should 
not be used for editing in a shared environment, as is perfectly 
possible with shapefiles and widely practiced. Not all users have 
access to database systems such as Postgres. I'm just looking for some 
clarity on best practices for the common scenario of working with QGIS 
using file based data in a network environment.


Árni


On Thu, 16 Mar 2023 at 11:47, Jorge Gustavo Rocha via QGIS-User 
 wrote:


Hi,

For data storage and manipulation databases are suitable. Files
are not.

Geopackages are wonderful to transfer data between systems or to
archive an entire project (snapshot of data, styles and the
project itself).

Regards,

Jorge

On 16/03/23 11:30, Árni Geirsson via QGIS-User wrote:

Thank you Jarosław. Isn't it strange that this was discussed 5
years ago and SMB file sharing is very common? Would a linux
based NAS be able to use another protocol? What are my options
for file based data sharing in QGIS? Abandoning geopackages is
not a realistic option for me, but I could get a different kind
of NAS unit, if that helps, what kind then? What amazes me is how
little I see this discussed. There was a message in this thread
this morning from Thomas Struller, but I am not sure it is about
the same root problem, maybe Thomas can elaborate.
Should this perhaps be discussed in another forum, closer to the
development of geopackage/sqlite?

Árni Geirsson

On Thu, 16 Mar 2023 at 09:52, Sadowski Jarosław
 wrote:

Long story short: gpkg is bad idea for network drives as
SMB/NAS etc

Sources:
Write-Ahead Logging (sqlite.org)


writing gpkg and sqlite on samba shares fails · Issue #628 ·
r-spatial/sf · GitHub



*_*

*Jarosław Sadowski*
Kierownik Zespołu ds. Ochrony Środowiska |/Biuro Strategii i
Planowania, Projektowania i Inżynierii Podprogramu Kolejowego/
/Environmental Protection Team Leader //| Railway
Subprogramme Strategy & Planning, Design & Engineering
Department/
e: jaroslaw.sadow...@cpk.pl
m: +48 532 720 230

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Re: [Qgis-user] Disable anti-aliasing on XYZ layer

[Patrick Dunford via QGIS-User]

There's a lot of questions about the context of use of an XYZ layer that 
you haven't given us detail of.


Are you referring to a layer loaded into the Qgis canvas via a data 
connection or some other context involving XYZ layers?


On 10/03/23 02:05, Stephane Goldstein via QGIS-User wrote:

Hi.
Is there a way to disable anti-aliasing of the png tiles loaded on an 
XYZ layer ?

Thanks
Stephane

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[Qgis-user] Removing style symbol also removes label

[Patrick Dunford via QGIS-User]

Good day

I have a vector layer that I am applying styles to. It has both symbols 
and labels applied in the styles.


When choosing a symbol, there is a useful feature that I can choose 
whether or not to have a symbol displayed by a check box that I can 
check or uncheck.


However it seems that if I uncheck the box to hide the symbol, the label 
is also hidden which I don't think should be happening. It looks like 
this is a bug in the software.


Should it be worth while to file a bug report for this issue.

TIA

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Re: [Qgis-user] Formatting the text ?

[Patrick Dunford via QGIS-User]

If you want a box drawn around a label then going in the label settings 
choose the background tab, select "Draw background", set to "Rectangle" 
and the other options as needed (including set "Rotation" to "sync with 
label") is straightforward.


--

Reply only to the list using "Reply List" in your email client.

Do not send personal replies.

On 24/01/23 23:12, Rafal Jonca wrote:


Because I didn't know could I add attachements here.

This is standard USFS topo data. Styled to behave as a map. I got the 
style for all other layers, but problem with this labels layer. And 
all labels (literally all) are on one layer here. All the 
characteristics of every label is in the attributes.


Here you have what I am able to do: font, color, size. But every that 
frame represent perfect location of labels here, also their angle, 
size, long etc.


On first pic. what I am able to do, and on the other how it should 
look like.


Thank you for answer, Patrick.

W dniu 24.01.2023 o 10:07, Patrick Dunford via QGIS-User pisze:


It's not super clear what you are asking for because the link is not 
a project, it is a collection of database tables without an attached 
project file.


If you are referring to the format of text labels displayed on the 
map canvas on a data layer, that is a project file issue that does 
not depend directly on the data in a set of layers. Or you might be 
referring to the layout manager or atlas output for printing out a map.


Either way, screenshots and layer styles / labels properties or 
layout manager fields / labels properties look to me to be a lot more 
useful in understanding the question.


-

Reply only to list. Do not send me any personal replies

On 24/01/23 11:05, Rafal Jonca via QGIS-User wrote:


Hello list,

I have cartographical question. My question is how to format this 
text properly ? These are all text elements of the map on one layer. 
I know how to set up the font, color, size of these text elements, 
but how to put them into these frames ? Every text element should be 
inside his frame. The frames are sometimes angled. There is "angle" 
value in that, but how to use it ?


This is a sample of the layer: 
https://we.tl/t-sMpld53776?utm_campaign=TRN_TDL_05&utm_source=sendgrid&utm_medium=email&trk=TRN_TDL_05


Best,

Rafal


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Re: [Qgis-user] Formatting the text ?

[Patrick Dunford via QGIS-User]

It's not super clear what you are asking for because the link is not a 
project, it is a collection of database tables without an attached 
project file.


If you are referring to the format of text labels displayed on the map 
canvas on a data layer, that is a project file issue that does not 
depend directly on the data in a set of layers. Or you might be 
referring to the layout manager or atlas output for printing out a map.


Either way, screenshots and layer styles / labels properties or layout 
manager fields / labels properties look to me to be a lot more useful in 
understanding the question.


-

Reply only to list. Do not send me any personal replies

On 24/01/23 11:05, Rafal Jonca via QGIS-User wrote:


Hello list,

I have cartographical question. My question is how to format this text 
properly ? These are all text elements of the map on one layer. I know 
how to set up the font, color, size of these text elements, but how to 
put them into these frames ? Every text element should be inside his 
frame. The frames are sometimes angled. There is "angle" value in 
that, but how to use it ?


This is a sample of the layer: 
https://we.tl/t-sMpld53776?utm_campaign=TRN_TDL_05&utm_source=sendgrid&utm_medium=email&trk=TRN_TDL_05


Best,

Rafal


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Re: [Qgis-user] Missing python plugin support on Win7

[Patrick Dunford via Qgis-user]

Windows 7 is not a currently supported operating system by Microsoft. 
Support by other software vendors, whether they are the Qgis project 
itself, or the vendors of external libraries used by Qgis (of which 
there are many) is very limited and cannot be guaranteed long term. Bug 
fixes are not backported to editions of the software that have been 
listed as Windows 7 compatible.


Whilst users of older operating systems are currently able to access 
archived versions of the software packages, the project file formats 
change quite regularly and therefore the older versions will have 
compatibility issues with projects produced on more recent versions of 
the software. The same is to some extent true of the various component 
file formats that can be attached into a project although changes to 
these are less frequent. But if a new spatial format is introduced that 
wasn't around when the Windows 7 software was developed, it is not going 
to be backported since software editions for Windows 7 are not currently 
being developed.


The availability of patches to enable newer versions to run on older OS 
can't be guaranteed. It would be unwise to rely on the long term 
availability of any type of support for Windows 7. If the current 
versions of the software are compiled at 64 bit, they may not run on a 
32 bit Windows 7 installation. Since MS has now introduced Windows 11, 
the maximum level of support provided by many organisations will only 
extend back to Windows 10.


On 26/11/22 11:29, Antonio Valanzano via Qgis-user wrote:
I have reinstalled the sw version3.22.13-Białowieża using the Express 
Install
and I noticed that in the bin folder the patch for Win 7 was named 
api-ms-win-core-path-l1-1-0.dll.w7
and that misspelled name caused the problem of the missing python 
plugin support.


So I deleted the .w7 extension and now everything is working fine.
I hope this information could be useful to some other Win7 users.

I don't understand the reason for this misspelling during the 
installation process and only Jurgen can give an answer.


As *Jonathan Moules* wrote in a previous thread  "QGIS on Windows 7" 
".. Something like 10% of all Windows users are Windows 7 after all -.."
it is also my opinion that the possibility of using the latest 
versions of QGIS for Win7 users is relevant and thanks to this patch 
it is possible.


Antonio Valanzano












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Re: [Qgis-user] large DEM not loading tiles correctly

[Patrick Dunford via Qgis-user]

I think you are referring to XYZ tiles which are 256x256 pixels. These 
are designed to be put onto a web server and served through WMTS to a 
client. Is that the kind of application you are using them in?


On 29/09/22 01:22, Michael.Dodd wrote:


You can see the format via the link (shown in more detail here OS 
Terrain® 50 | OS Data downloads | OS Data Hub 
<https://osdatahub.os.uk/downloads/open/Terrain50?_gl=1*19hd950*_ga*MTM1NTcyMjQ5MC4xNjY0MzY3NTYw*_ga_59ZBN7DVBG*MTY2NDM2NzU2MC4xLjAuMTY2NDM2NzU2MS41OS4wLjA.&_ga=2.219085721.1292185665.1664367560-1355722490.1664367560>) 
they are ascii grid basically numbers so should not have any .jpg 
issues. It is unfortunate that they chose to make the grid file so 
difficult to use by chopping it into the many thousands of small 
squares each within its own folder within other folders within other 
folder.


*From:*Qgis-user  *On Behalf Of 
*Patrick Dunford via Qgis-user

*Sent:* Wednesday, September 28, 2022 1:14 PM
*To:* qgis-user@lists.osgeo.org
*Subject:* Re: [Qgis-user] large DEM not loading tiles correctly

CAUTION: This mail comes from outside the University. Please consider 
this before opening attachments, clicking links, or acting on the 
content.


Hello

This is a raster format? and how large are the tiles?

I spend a lot of time working with raster files often a few thousand 
at a time. There doesn't seem to be a problem displaying them in Qgis 
unless they are Progressive Jpeg format, which in more recent years 
seem to have an issue with one of the third party libraries Qgis uses 
to import with.


On 29/09/22 00:32, Michael.Dodd via Qgis-user wrote:

I am trying to put together the 50m uk DEM e.g.

https://www.data.gov.uk/dataset/835cf20a-8feb-4394-8b30-dcfe840ac13d/os-terrain-50-dtm

<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.data.gov.uk%2Fdataset%2F835cf20a-8feb-4394-8b30-dcfe840ac13d%2Fos-terrain-50-dtm&data=05%7C01%7Cmichael.dodd%40open.ac.uk%7Ce252ba17960e47d4459b08daa14af7f3%7C0e2ed45596af4100bed3a8e5fd981685%7C0%7C0%7C637999640602880359%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=0kauz1XTDogmzS2bswO60uWR2EgvdVNCSOPzTKC3pjo%3D&reserved=0>
but it often does not work.  The data are supplied as thousands of
small tiles that takes ages to unpack and put into a folder to get
into qgis, however when you try to load the tiles some work and
others don’t and even the ones that do work and display fine
sometimes don’t merge to form large tiles and sometimes will form
virtual rasters but not merged files.  Basically it is a mess.  I
suspect others have done this successfully so any suggestions?

It is particularly odd that some of the tiles will merge and
others won’t and that some won’t display if you ask it to load
hundreds at a time but if you just add them in a few at a time
then they will load and display (in addition to the hundreds
already loaded). This suggests various bugs assuming the original
data are not in a whole variety of slightly different formats
(should all be .asc)



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Re: [Qgis-user] large DEM not loading tiles correctly

[Patrick Dunford via Qgis-user]

Hello

This is a raster format? and how large are the tiles?

I spend a lot of time working with raster files often a few thousand at 
a time. There doesn't seem to be a problem displaying them in Qgis 
unless they are Progressive Jpeg format, which in more recent years seem 
to have an issue with one of the third party libraries Qgis uses to 
import with.


On 29/09/22 00:32, Michael.Dodd via Qgis-user wrote:


I am trying to put together the 50m uk DEM e.g. 
https://www.data.gov.uk/dataset/835cf20a-8feb-4394-8b30-dcfe840ac13d/os-terrain-50-dtm 
but it often does not work.  The data are supplied as thousands of 
small tiles that takes ages to unpack and put into a folder to get 
into qgis, however when you try to load the tiles some work and others 
don’t and even the ones that do work and display fine sometimes don’t 
merge to form large tiles and sometimes will form virtual rasters but 
not merged files.  Basically it is a mess.  I suspect others have done 
this successfully so any suggestions?


It is particularly odd that some of the tiles will merge and others 
won’t and that some won’t display if you ask it to load hundreds at a 
time but if you just add them in a few at a time then they will load 
and display (in addition to the hundreds already loaded). This 
suggests various bugs assuming the original data are not in a whole 
variety of slightly different formats (should all be .asc)



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Re: [Qgis-user] Profile data (other than plugins) that can cause crashes?

[Patrick Dunford via Qgis-user]

OK. so further testing with a new profile show the issue is still there 
with the new profile. It really is a very random issue with no obvious 
cause.


On 22/09/22 14:31, Patrick Dunford wrote:

Good day

Since I first began to use Kubuntu 22.04 from the .0 release I started 
to see crashes on Qgis that weren't experienced on the same versions 
running on previous releases of Kubuntu (certainly the case on 20.04). 
These seem to come and go depending on some random factors, which 
makes it extremely hard to write up a meaningful bug report for the 
issue which is why so far all that has been filed is one with the 
Ubuntu project bug reporting system.


All of these crashes occur when Qgis attempts to display a file 
operation dialog (e.g. add a layer, save a layer definition file, etc).


Today I started to see these issues happening on a system that has 
been trouble free for weeks if not months, the crashes became very 
consistent / repetitive which had not been observed for a long time up 
to now if at all.


I have tried a new profile and at the moment that makes the problem go 
away. However the next question would be what might be contained 
within a profile that could cause such an issue. Often it is 
considered the most likely issue in a profile is to do with installed 
plugins. In this case, both profiles contain the same plugins which 
are the 10 that are installed as core plugins (5 selected by default). 
If the issue is within a profile, it must be some other part of the 
profile.


Is there any base of experience about other parts of a profile (such 
as user settings) which can cause issues?


The most obvious different between profiles in this case is 
previewImages folder, however removing these images made no difference 
to the issue. It would require further testing or analysis to try to 
find out where the issue might be occurring. Nevertheless a bug report 
has been filed, attaching the old and new profiles.


Is there any straightforward way of producing a comparison between 
different versions of the databases (which must include all the user 
settings) in a profile.


T.I.A.

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[Qgis-user] Profile data (other than plugins) that can cause crashes?

[Patrick Dunford via Qgis-user]

Good day

Since I first began to use Kubuntu 22.04 from the .0 release I started 
to see crashes on Qgis that weren't experienced on the same versions 
running on previous releases of Kubuntu (certainly the case on 20.04). 
These seem to come and go depending on some random factors, which makes 
it extremely hard to write up a meaningful bug report for the issue 
which is why so far all that has been filed is one with the Ubuntu 
project bug reporting system.


All of these crashes occur when Qgis attempts to display a file 
operation dialog (e.g. add a layer, save a layer definition file, etc).


Today I started to see these issues happening on a system that has been 
trouble free for weeks if not months, the crashes became very consistent 
/ repetitive which had not been observed for a long time up to now if at 
all.


I have tried a new profile and at the moment that makes the problem go 
away. However the next question would be what might be contained within 
a profile that could cause such an issue. Often it is considered the 
most likely issue in a profile is to do with installed plugins. In this 
case, both profiles contain the same plugins which are the 10 that are 
installed as core plugins (5 selected by default). If the issue is 
within a profile, it must be some other part of the profile.


Is there any base of experience about other parts of a profile (such as 
user settings) which can cause issues?


The most obvious different between profiles in this case is 
previewImages folder, however removing these images made no difference 
to the issue. It would require further testing or analysis to try to 
find out where the issue might be occurring. Nevertheless a bug report 
has been filed, attaching the old and new profiles.


Is there any straightforward way of producing a comparison between 
different versions of the databases (which must include all the user 
settings) in a profile.


T.I.A.
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Re: [Qgis-user] Event loop in QGIS3

[Patrick Dunford via Qgis-user]

Thanks for this question. I had the same issue in my code, but running a 
console script in the Qgis application, printing to the console output 
would achieve the same thing. Is this applicable to scripts that run in 
the console?


On 17/08/22 07:02, Tudorache, Marian via Qgis-user wrote:


Hello community,

A while ago I sent a question about a problem with QMessageBox and 
message bar does not get updated during a long process.


In my example I create a script like this.

from qgis.PyQt import QtWidgets

message = "Wait to open the airspace project..."

msg = QtWidgets.QMessageBox()

msg.setText(message)

msg.show()

qgis.utils.iface.messageBar().pushMessage("Wait", message)

for i in range(1000):

    print(i)

qgis.utils.iface.messageBar().pushMessage("Done", "The process is done")

msg.setText("The process is done")

msg.show()

qgis.utils.iface.messageBar().pushMessage("Done", "The process is done"))

When I run the scrip in QGIS 2.18 the QMessageBox displays first the 
message "Wait to open the airspace project...". The same message is 
pushed to messageBar.


Then during the loop it displays the variable i.

At the end of the loop the QMessageBox displays the message "The 
process is done" which is also pushed to the messageBar.


When I run the same scrip on QGIS 3 the QMessageBox is empty. The 
message "Wait to open the airspace project..." is not displayed by 
QMessageBox nor by messageBar.


The print inside the loop displays the I and when the loop is done the 
QMessageBox displays the message "The process is done".


The messageBar displays also the message "The process is done". And 
after a while it displays the initial message "Wait to open the 
airspace project..."


I modified the scrip by adding QApplication.processEvents() inside the 
loop and now everything is fine.


It seems QGIS3 no longer triggers this event loop and I have to do 
this explicitly by calling processEvents from QApplication.


*Why QGIS 3 needs to call QApplication.processEvents() and QGIS 2 does 
not need?*


Thank you,

Marian




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Re: [Qgis-user] Convert huge shapefile to small size

[Patrick Dunford via Qgis-user]

A shapefile is a vector files, as far as I know. I don't think any 
rasters are stored in this format.


If there is a large volume of data, it may have a great many records 
referencing a large number of features. Vector layers are usually made 
up of a number of points that together form one feature. So practically 
all the data in a vector layer is the coordinates of these points.


The only way of getting it smaller is reduce the number of points, 
reduce the number of features, or maybe there is a format that's compressed?


Tiles depend on the zoom level, you don't need all the resolution at the 
lower scales or zoom levels because the map is just cluttered, you only 
need them when you zoom in.


On 28/07/22 13:46, krishna Ayyala via Qgis-user wrote:

Hello,
I have a shapefile of 5GB in size. Is it possible to convert this 
shapefile to a smaller size file? It can be any format, not 
necessarily a shapefile. But, preferably a vector format. I tried to 
convert it into tiles, but that didn't work as it was losing the 
resolution. I am looking to convert this 5GB size file to about 500MB.


Regards.

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Re: [Qgis-user] Export gpx?

[Patrick Dunford via Qgis-user]

There is also a limitation to the number of fields that can be stored. I 
think it is just limited to name?


On 25/07/22 08:17, Ramon Andinach via Qgis-user wrote:

Hi David,

The GPX format is only able to have points and lines. You’ll need to 
convert the polygon into a line first, and there is something in the 
vector menu that will do this.

(Points map to waypoints, lines map to tracks.)

Regards,
Ramon.

On 25 Jul 2022, at 03:52, David Witton via Qgis-user 
 wrote:


I'm trying to transfer the boundary of a property that is displayed 
in a vector layer in QGIS 3.16.15  into a mapping software. My first 
thought is to select the row in the attribute table, then export it 
as a .gpx file.


However I'm getting an error "Geometry type of 'Multi Polygon' not 
supported in GPX.


Is what I'm trying to do possible using another format?

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Re: [Qgis-user] SOLVED: Offline background map for large regions

[Patrick Dunford via Qgis-user]

You can also apply scale rules when using file based layers on your 
computer. Using a DB is great for certain applications, but if it is a 
local server on your laptop, you have to weigh up the pros and cons, 
since it has just shifted the processing workload from one application 
to another, which may or may not result in a net performance gain.


On 22/07/22 21:43, Andreas via Qgis-user wrote:

Hi,

finally I got it.

I will stick with the 180 GB spatialite db (though being a little
unhappy with the size), but applying a redy-to-go osm style I found on
the net reduced the details of the lower scales, so it stays useable
when staying there. The style has only 3 zoom levels, so maybe I'm going
to look for more. The speed bottleneck at the moment is CPU/GPU power,
as my laptop has no dedicated GPU.

Which also works very nicely is the live gps centering function which
helps keeping the overview. So I can find my current position without
the need of scrolling to higher scales.

Thank you all for your kind assistance and the many helpful hints!

Andreas
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Re: [Qgis-user] Offline background map for large regions

[Patrick Dunford via Qgis-user]

What are you drawing that needs 180 GB of data? That's the whole 
question. That's a lot of data for vectors.


In other words going back to my previous point - you do not need to draw 
all of the detail at lower scales. Use scaling rules to address that and 
performance should show a big increase.


On 21/07/22 08:42, Andreas via Qgis-user wrote:

Hi Asim,

meanwhile I found out that creating a spatialite database needs (unlike
 postgres) only very little RAM for building. On the other side, after
running a wole day and night on conversion of the  ~30GB osm_europe.pbf
with ogr2ogr, I have a 180 GB database now which needs minutes to load...

Don't know if postgres is more performant. Setup is much more 
complicated.


Regards,

Andreas



Am 20.07.22 um 03:43 schrieb Asim:
>
> On 7/15/22 4:11 PM, Andreas via Qgis-user wrote:
>> I think postgres itself is not the problem at all, but the scripts 
that

>> move the vector tiles into the database. In the instructions for usage
>> of these import scripts is written that they need at least as much RAM
>> as the size of the vector file. So I assume it has to load the whole
>> file into memory before it can be processed.
>
> Thank you for the clarification, Andreas.  I'm new to the GIS ecosystem
> but the OGR FDW seems to be addressing the problem of not having to 
load

> entire vector data at once: https://github.com/pramsey/pgsql-ogr-fdw.
>
> Asim
>
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Re: [Qgis-user] Startup error and missing directories under Fedora 36

[Patrick Dunford via Qgis-user]

Hello

The metasearch error is the same one that often comes up running the 
Flatpak edition of Qgis, however the Gis works well.


Are you running the Flatpak edition? The directory path may in fact be 
/.var/app/share etc.


Errors dues to the Flatpak environment are possibly down to Flatpak 
packaging and not necessarily in the software itself.


On 19/07/22 10:37, John Dougherty via Qgis-user wrote:

QGis / Python error:

Running QGis on Linux, Fedora 36, QGis is looking for a nonexistent
directory(ies)


  On start up of QGis 3.26 (Buenos Aires) I receive the
following error message:

2022-07-18T15:16:48 WARNINGPython error : Couldn't load plugin
'MetaSearch' due to an error when calling its classFactory() method See
message log (Python Error) for more details.

Looking in the Python error list reveals a long list of errors that all
come down to Python routines apparently looking for key elements in
a non-existent directory(ies):

   ImportError: cannot import name 'soft_unicode' from 'markupsafe'
   (/usr/lib/python3.9/site-packages/markupsafe/__init__.py)

and

   /app/share/qgis/python/qgis

Since this error does not appear under windows 10, it seems to be
something about the way my system is configured.  I can find no
indication of "/app" as a standard directory in any Linux release, nor
is there a "markupsafe" directory under
"/usr/lib/python3.9/site-packages".

Any help would be welcome.

JWDougherty
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Re: [Qgis-user] Offline background map for large regions

[Patrick Dunford via Qgis-user]

What you are talking about is vector based data which can be put into a 
project as either raster tiles generated statically, or vector tiles 
generated on the fly, and what you can actually get in practice will 
depend on what you have the skill or ability to implement. Implementing 
a tileserver of any kind requires quite a skillset.


I would go back to the shapefiles and look at the amount of detail that 
is needed at each zoom level. You can implement style rules that work at 
different scale levels, meaning the level of detail that is displayed at 
a small scale can be simplified quite a lot. I use this for generating 
XYZ tiles for a web site I maintain, because zoomed right out at zoom 
level 1 (something like a scale of 1:500 000) it is much easier to find 
the general area of the map without a lot of unnecessary clutter and has 
the bonus of taking less time to render.


On 15/07/22 11:35, Andreas via Qgis-user wrote:

Hi Paul,

thank you for the links!

Despite this is for Windows (I use Linux), it is for a XYZ tileserver
but I need vector tiles. Raster tiles may be too many for whole Europe
in plenty zoom levels. And I don't know where to get them, as everywhere
I know you can only download small regions; the mentioned link in the
video opentiles.com does not exist any more.

Postgres may not work for me, as I read it needs at least as much RAM as
the file size to import the map into the database. My vector tiles have
20 GB while my PC only 8 GB. It may run out of memory.

But probably this points me to the right direction. I just discovered
there is tileserver-GL https://tileserver.org/ and tileserver-PHP
available and I gave them a try.

Don't know why, but tileserver-gl can not be installed on Linux with nmp
(compile error due to unexpected OS), and there are only the options npm
or Docker. Docker is not in the standard repositories so foreign package
sources shall be added, what I really want to avoid because of the high
security risk. I tried also tileserver-PHP, but strangely as it is
intended as a local installation, it shows not even a configuration
interface without  internet access. It pulls its css and some javascript
from an external server :-/  Also, I can not get it running with the
maptiler .mbtiles because the WMTS capabilities (.mbtiles is read!)
seems to be provided in a wrong syntax.

So, still stuck...

Regards,

Andreas


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Re: [Qgis-user] Qgis 3.22.8 Error messages displayed in the GUI

[Patrick Dunford via Qgis-user]

I filed a bug report for this some time ago and was told it was not a 
bug in the software.


On 11/07/22 23:39, Piet via Qgis-user wrote:


Dear List,

I used a selfcompiled Qgis, build with 'Debug-Option' set in ccmake.

Now there's a small red window in the main window which displayed 
errors/warning.


In my case "Qt: QXcbConnection: XCB error: 3 (BadWindow), sequence: 
65154, resource id: 11286601, major code: 40 (TranslateCoords), minor 
code: 0",


which seems to be a known QT-Bug.

Can I turn of this error window?

Because it's upset me a bit and I can see the warnings in a console as 
well.


Thank you for any hint!

Kind regards

Piet


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Re: [Qgis-user] Offline background map for large regions

[Patrick Dunford via Qgis-user]

When it comes to a website, generally, a good way of getting background 
maps (rasters) is XYZ tiles or similar with the different zoom levels. 
Each higher zoom level doubles the amount of tiles needed, so the way to 
avoid too many tiles taking up too much space is to reduce the number of 
zoom levels needed to some realistic amount. The tiles are generally all 
the same size 256x256 pixels and it works very well in a web client over 
all different speeds of connection. You start at the lowest level and 
then zoom in to the next level and so on. This is how it is possible to 
do it over slow small devices such as phones, only downloading the tiles 
that actually need to be displayed at that point.


I am not sure if this is what you are referring to or something that 
actually loads in the Qgis canvas, in which case the above might not be 
relevant. But I have worked with many raster tiles loaded off the hard 
disk as backgrounds and generally there has not been a speed issue for 
them. However if you don't have enough RAM, this could create a problem. 
If you expect to use a lot of swap then buy a large SSD and set this up 
as you swap partition, since it will perform much better than a regular 
hard disk.


Also look at what resolution the downloaded imagery is, you may not need 
more than 1 metre resolution depending on how much you need to zoom in, 
so that you could be able to reduce the filesizes quote a lot.


On 10/07/22 20:58, Andreas via Qgis-user wrote:


Hello!

First I have to say that I'm a qgis beginner and I'm not very much into
the concepts about functions and design behind QGIS, and GIS in general.
So please apologize for any strange question...


Currently I have an older core i7 with 8 GB RAM running QGIS Desktop
3.10 on Linux Mint 20.3, which I know is already obsolete but it's in
the repositories of this most recent Linux Mint LTS version, and I need
a stable system that does not break due to a library update etc.


I want to visualize data points, that I collect "on the road" over large
distances, on the fly. So far so good everything works very fine,
opening the data log file in a text layer with surveillance of log
changes. Except having an offline background map for orientation. There
is not always internet connection, and also it would be quite expensive
to continuously download the tiles from a server over LTE.



Up to now I tried using shapefiles from geofabrik.de, but even importing
a small town takes minutes.

Also the plugins for downloading xyz tiles will not work, as I need
whole europe offline available in the best case, at least a whole 
country.


Then I imported a .osm file in a spatialite database but there are
thousands of attributes I have to chose from, not knowing which ones,
and also I cannot import more than a small region due to the insane time
it takes.

The last thing I tried was a download of Germany vector tiles from
maptiler.com, about 3,5 GB. When I drag and drop it into QGIS, it loads
for hours without coming to an end, there is no information about what
the software is doing (progress bar) or a button to stop the import, so
I finally killed the QGIS process.

I was also looking for GeoPackage maps, as they seemed to have an index
and mbtiles not (which may be what causes the described problems), but
did not find any resources on the net except from a site that provides
the whole planet earth (which is way too much for me).

Yesterday I tried to setup a QGIS Server to set up a WMTS service on the
same machine, but I failed on finding out how to make map data available
on the server (I have to provide a QGIS project file but as I already
wrote, I was not even able to import a simple all-germany map).


So, finally, there must be something I'm missing or I don't understand.
If you have a smartphone or a Garmin GPS, you can easily download a map
for whole germany that is about 2 GB, that can be imported in a few
seconds, then accessed very performant by slow processors with tiny
available memory. I also don't see why it should be necessary to go via
a WMTS Server (http) to provide map data in a way QGIS can them handle
with performance - how is the server getting its high performance, and
why QGIS can't do it on it's own? Or can it - how??


Any hints about how I can get large area offline maps into QGIS are
highly appreciated - thank you very much in advance!

Andreas







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Re: [Qgis-user] Issues with dependencies for Ubuntu 22.04

[Patrick Dunford via Qgis-user]

If you use apt which repository are you installing from? The Ubuntu 
repository or the Qgis repository?


On 8/07/22 02:29, vicentesmith via Qgis-user wrote:

Hello,
I'm trying to install QGIS  in a fresh Ubuntu 22.04 system. Before 
building QGIS, I'm installing the dependencies from 
https://github.com/qgis/QGIS/blob/master/INSTALL.md#33-install-build-dependencies 
for jammy. At some point during the process, the system asked which 
services to restart so I left the default ones (packagekit, palkit, 
rsyslog, ssh, systemd-journal, systemd-manager, systemd-networkd, 
systemd-resolved). Everything seemed OK at the end but rebooting the 
system froze everything and I cannot even log in.
NOTE: I also tried using apt to install QGIS directly. This time, 
there was no problem but it installed v3.22.4.

Thanks.



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Re: [Qgis-user] NULL in attribute table

[Patrick Dunford via Qgis-user]

Use the coalesce function to convert the null to something like ''

e.g. coalesce ('Field', '')

then test in an expression.

Otherwise null propagation will cause the expression to fail.

On 7/07/22 04:15, Dario C via Qgis-user wrote:

Hi there,
I'm using an attribute table on my layout. For all the field without 
any value I have NULL. Is there any way to add an expression like 
(when FIELD is NULL Then ' ') ?

Thank you

regards,
Dario

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Re: [Qgis-user] trouble adding a basemap from a WMTS source

[Patrick Dunford via Qgis-user]

If you are getting blank results there is a reasonable prospect of a 
problem with the service provider. This may include geographic 
limitations on the data access. Certainly from where I am, the page that 
is supposed to display the WMTS layers comes up blank, and a connection 
error results from attempting the steps below.


On 5/07/22 12:17, Stephen Sacks via Qgis-user wrote:
My project CRS is EPSG:2263;  all 21 layers were created in this 
project with CRS   EPSG:2263  , which seems appropriate for a public 
park in Brooklyn, NY.  If I use Google Satellite Hybrid as basemap, 
everything looks to be in the right  place.  I would like to replace 
the Google basemap with one of many maps available from the New York 
City Department of Information Technology & Telecommunications (DOITT 
https://maps.nyc.gov/tiles/#basemap-layers-wmts). But after many 
tries, all I get is a totally blank layer.

   Here, in detail, is what I  have done:
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Re: [Qgis-user] Simplify geometry - snap to grid

[Patrick Dunford via Qgis-user]

Is this the grid you see in View -> Decorations -> Grid ?

On 29/06/22 07:50, Delaz J via Qgis-user wrote:

Hi Klaus,

Just a guess: the only snap to grid thing I know about is 
https://docs.qgis.org/3.22/en/docs/user_manual/working_with_vector/editing_geometry_attributes.html#snapping-on-custom-grid. 
Worth a check?


Regards,

Harrissou

Le 28/06/2022 à 15:54, Klaus Mithöfer via Qgis-user a écrit :

hello,

with the simplify tool in QGIS you can simplify geometries using 
either  Douglas-Peucker Algorithm, Visvalingam-Algorithm or snap to 
grid. I understand the algorithms, but how the grid snapping work? 
Where is is the grid defined? I don't get that point. maybe someone 
can explain.


Thanks an kind regards
Klaus
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Re: [Qgis-user] Using OS Raster Data in QGIS

[Patrick Dunford via Qgis-user]

Generic rules for raster image files is there will be at least two or 
three files for each tile:


* The raster itself

* The world file which has a similar extension usually ending with a W 
e.g. JGW for a JPEG tile


* One or more XML files

The world file contains the coordinates and pixel size information, the 
XML file(s) will contain the CRS information.


If these files are missing Qgis will display a ? at the end of the file 
name when attempting to load it.


You can set the CRS in Qgis to compensate for a missing XML file CRS, 
but the world file is essential otherwise the raster will be loaded at 
the origin coordinates (0,0) of whatever CRS is being used.



On 26/06/22 02:38, DEREK Beddis via Qgis-user wrote:


Hi, I used QGIS about 4 years ago to produce maps for 1:25,000 and 
1:50,000 OS maps, I feel a fool now, but I am struggling to get QGIS 
2.18.28 to upload the files in the Raster (miscellaneous) section as I 
used to do. I just get all the files not being recognised.


I have downloaded the latest QGIS 3.8, but do not understand this one 
at all.


Could someone help me with a step by step loading of the OS raster 
data into the QGIS system so that I can produce some maps please?


I also have the Geo referencing and sea tiles but again QGIS does not 
seem to like them. I am using EPSG:27700


Thank You

Derek

Sent from Mailfor Windows


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[Qgis-user] WMTS connection timeouts

[Patrick Dunford via Qgis-user]

Good day

Often in my Qgis projects that have WMTS layers I see messages like the 
following


2022-06-20T07:41:15     WARNING Network request 
https://basemaps.linz.govt.nz/v1/tiles/aerial/EPSG:3857/16/64195/41592.jpeg?api= 
timed out


Does anyone know enough about WMTS to know why this might be occurring

The WMTS starts working again if I quit and restart Qgis. Is there any 
way of refreshing the connection from within the open project, or any 
settings that will stop this problem occurring.


Thanks
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Re: [Qgis-user] digitizing

[Patrick Dunford via Qgis-user]

There are some times when the libraries can run out of memory if a 
raster is very large, so you can have something that something like a 
graphics editor e.g Gimp can open OK but Qgis coujld have trouble 
opening it.


On 17/06/22 14:22, Firstname Lastname wrote:
I think that there is something wrong with the Tif file I was using.  
I had the same problem with a couple of files but I went back to the 
source file and redid the referencing and it is ok.


On Thu, Jun 16, 2022 at 7:46 PM Patrick Dunford via Qgis-user 
 wrote:


This is a generic answer, as more information would be needed to
determine exactly the situation you are experiencing.

If you zoom to the layer, is it then displayed in the same place
as the rest of your map?

My recollection of the georeferencer is it produces a world file
to go with the layer. This should have the correct top-left
coordinates and pixel resolution in it. Is there also an XML file
that specifies the CRS?

Look at the layer name where it is loaded in the GIS and see if
there is a question mark displayed next to its name, that
indicates QGIS doesn't have enough information to position the
layer, such as the information that is stored in sidecar files.

It is also possible if the file is very large that it will be slow
to display. Also have a look at the error log at the bottom of the
screen to see if any error messages are displayed.

On 17/06/22 04:23, Firstname Lastname via Qgis-user wrote:

i have been successfully using the georeferencer for some time. 
i referenced several maps and they succesfully georeferenced
and  displayed for me.
Then, i was digitizing and i ran the georeference tool and for
some reason, the new referenced maps do not display.  i have
exited and tried to georef in a new project and made sure that i
have the same CRS for the basemap and the georef tool but when i
run the referencer, the layer appear but the map will not
display.  i have tried restarting, clearing the georef tool and
running again but i get the same result.   Does anyone know what
i am doing wrong and why my referenced maps will not display?

-- 
Byron Veilleux, MSc. P.Geo

Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414

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Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
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Re: [Qgis-user] digitizing

[Patrick Dunford via Qgis-user]

This is a generic answer, as more information would be needed to 
determine exactly the situation you are experiencing.


If you zoom to the layer, is it then displayed in the same place as the 
rest of your map?


My recollection of the georeferencer is it produces a world file to go 
with the layer. This should have the correct top-left coordinates and 
pixel resolution in it. Is there also an XML file that specifies the CRS?


Look at the layer name where it is loaded in the GIS and see if there is 
a question mark displayed next to its name, that indicates QGIS doesn't 
have enough information to position the layer, such as the information 
that is stored in sidecar files.


It is also possible if the file is very large that it will be slow to 
display. Also have a look at the error log at the bottom of the screen 
to see if any error messages are displayed.


On 17/06/22 04:23, Firstname Lastname via Qgis-user wrote:
i have been successfully using the georeferencer for some time.  i 
referenced several maps and they succesfully georeferenced 
and  displayed for me.
Then, i was digitizing and i ran the georeference tool and for some 
reason, the new referenced maps do not display.  i have exited and 
tried to georef in a new project and made sure that i have the same 
CRS for the basemap and the georef tool but when i run the referencer, 
the layer appear but the map will not display.  i have tried 
restarting, clearing the georef tool and running again but i get the 
same result.  Does anyone know what i am doing wrong and why my 
referenced maps will not display?


--
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414

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Re: [Qgis-user] Purchase of old satellite photos for small AOI

[Patrick Dunford via Qgis-user]

Aerial photography might be a better option to explore for a small area 
like that, if it is available in your country.


On 12/06/22 06:58, Patrick Dunford wrote:

What do you call "high resolution"?

The highest resolution I see from my area on the likes of Google Maps 
is actually aerial photography, taken the traditional way with a plane.


On 4/06/22 06:24, Piotr Kania via Qgis-user wrote:
Hello everyone, do You know of a service/company that allows you to 
buy high resolution satellite imagery from 1999-2003 for a small area 
(AOI maximum 1 ha)? Probably Ikonos satellite products. Suppliers in 
my country require the purchase of a large area with a minimum of 
about 20 km2 (probably one "scene") - thanks for any answer.


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Re: [Qgis-user] Purchase of old satellite photos for small AOI

[Patrick Dunford via Qgis-user]

What do you call "high resolution"?

The highest resolution I see from my area on the likes of Google Maps is 
actually aerial photography, taken the traditional way with a plane.


On 4/06/22 06:24, Piotr Kania via Qgis-user wrote:
Hello everyone, do You know of a service/company that allows you to 
buy high resolution satellite imagery from 1999-2003 for a small area 
(AOI maximum 1 ha)? Probably Ikonos satellite products. Suppliers in 
my country require the purchase of a large area with a minimum of 
about 20 km2 (probably one "scene") - thanks for any answer.


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Re: [Qgis-user] issue with ”Task complete: Counting features in...”

[Patrick Dunford via Qgis-user]

It may well be the use of a cloud drive that could cause some problems. 
I use a cloud drive as backup but have never tried having it synced to a 
computer. Is there only one user using it all of the time?


On 16/05/22 21:43, Alexandru Munteanu via Qgis-user wrote:


Thank you, Nicolas, for your reply!

Yes, the project is on drive, with offline access. We use it so we can 
work remotely.


I have tried the following:
1. I copied the project on computer - it didn't work
2. deleted the wms layers - no luck
3. also tried to reduce the number of layers to have only the layers i 
use for a print layout - it still freezes and sometimes (not always) 
counts the features.


Also, another problem is when i save the project and close it - i have 
to forcibly shut it as it also freezes and wont close on its own.


Maybe i am doing something wrong, i don't know.

Best,
Alexandru



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Re: [Qgis-user] aq, floods and GIS

[Patrick Dunford via Qgis-user]

This appears to be irrelevant and should be removed as spam.

On 27/04/22 11:50, Dave Stevens via Qgis-user wrote:

https://blog.cerowrt.org/post/state_of_fq_codel/


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Re: [Qgis-user] RAM and processing speed requirements for QGIS

[Patrick Dunford via Qgis-user]

As others have written it will depend on the tasks you are doing.

The performance of any computer can be significantly improved by 
replacing HDDs with SSDs. Modern computers using the NVMe standards for 
SSD (M.2 interface etc) can offer a great deal of speed improvement for 
SSD storage over SATA which is very significant when working on 
intensive projects that use a lot of resources.


The PC platform is significantly easier to expand if resource needs 
change. My seven year old system started out with 8 GB of RAM and 
currently has 32 GB, whilst the swap file performance (virtual memory) 
has been significantly improved with SATA and M.2 SSD storage (now at 
200 GB). The latter provides almost limitless performance capability 
enhancements to the system at modest cost without having to upgrade the 
entire system. I use Ubuntu as the operating system for this computer.


On 20/04/22 06:46, Helena Farrell via Qgis-user wrote:
Hello, I am seeking input on whether my 7 year old Mac with 8GB RAM 
and a 2.7gigahertz processor is likely to perform poorly at running 
QGIS. Since these are like the bare minimum in terms of power, and I 
assume QGIS is a data-heavy program, I may need to invest in a new 
computer. Anyone have advice on RAM and processing speed 
specifications  that I should look for and whether a PC be better than 
a Mac for running this program?


Thank you!

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[Qgis-user] Issue " GDAL chokes opening attached JPG, yet works OK in other applications #1545 "

[Patrick Dunford via Qgis-user]

Just noted on the closed issue that I saw this problem for the first 
time today. The error message returned by Qgis being


2022-04-18T01:53:51     WARNING 
D1961_94CFT_92XGM_94CFW_92XGN_f6e10828_d0fa_42e6_a318_901bef99006f :: 
/mnt/sharerw/mainpc/maps/References/Volume 11-12 - MSL/Station - 
Dunsandel/D1961:94CFT-92XGM+94CFW-92XGN.jpg, band 1: IReadBlock failed 
at X offset 0, Y offset 600: Reading this image would require libjpeg to 
allocate at least 186624 bytes. This is disabled since above the 
104857600 threshold. You may override this restriction by defining the 
GDAL_ALLOW_LARGE_LIBJPEG_MEM_ALLOC environment variable, or recompile 
GDAL by defining the GDAL_LIBJPEG_LARGEST_MEM_ALLOC macro to a value 
greater than 104857600


In this case the raster file size is only 26 MB.

The error message is spurious as the issue is found to be caused by 
using a Progressive JPEG as exported from Gimp. When the Progressive 
setting is turned off in the Gimp export settings there are no problems 
importing the raster in Qgis or displaying it.


My recollection is the issue of progressive JPEGs not being able to be 
loaded in Qgis is not a new problem and something I first found to be 
happening several years ago. I had to at that time convert all the 
progressive JPEG rasters I had into non progressive. The issue may have 
occurred because of a new release of GDAL or possibly when Qgis 3.0 was 
introduced.
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Re: [Qgis-user] Help with scales in print layouts for geographic CRS

[Patrick Dunford via Qgis-user]

On 6/04/22 11:34, Greg Troxel via Qgis-user wrote:

Jorge Gustavo Rocha via Qgis-user  writes:

2) Using a geographic CRS, the same 150mm x 150mm map, at the same

1:1 scale, the area is bigger then the 1500m polygon. The result
is attached https://nextcloud.geomaster.pt/index.php/s/H2eAytsPANyxn6Y

On both layouts the scale bar widget is working properly. The
distances (and areas) are properly calculated in QGIS interface. I
have set the GRS 1980 ellipsoid for distance and area calculations.

What does it mean to use a geographic CRS for a print layout?  Do you
really expect longitude on the x axis and latitude on the y axis?  The
value of meters/degree is different for x and y, unless you are at or
near the equator.  (Living at 42N-ish, I'm very aware of this.)


This may be the case for projections like EPSG:3857 that are based on a 
spherical projection of the Earth but is it the case for all projections?



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Re: [Qgis-user] Qgis on Windows 10 ARM

[Patrick Dunford via Qgis-user]

There are a few possible resolutions available, but the hardware specs 
could limit a lot of them significantly. If any option requires $$$ it 
would be a toss up whether to put that towards a more capable device 
with a x86 CPU.


On 21/03/22 06:52, Thayer Young via Qgis-user wrote:

Hi Rayfson,

You will need an x86 emulator to run QGIS on ARM. This article says 
you need to upgrade to Windows 11 to get the Microsoft emulator:

https://www.pcmag.com/news/microsofts-x86-64-bit-emulator-for-arm-devices-is-exclusive-to-windows

FYI, Rosetta2 is the MacOS ARM emulator, I can verify that QGIS runs 
under Rosetta2.


-Thayer


On Saturday, March 19, 2022, 05:39:15 PM EDT, 
qgis-user-requ...@lists.osgeo.org  
wrote:

--
Date: Sat, 19 Mar 2022 17:37:12 -0400
From: rayfson souza 
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Qgis-user Digest, Vol 193, Issue 44
Message-ID:
    
Content-Type: text/plain; charset="utf-8"

I have a Samsung Galaxy Book with ARM processor running Windows 10. No 
qgis

installer works on this notebook. Is there an updated version of QGIS for
this processor and OS? I can't find a download for it.

Processor: Snapdragon (TM) 7c Gen 2 @.55GHz 2.55GHz

Ram: 4GB

64-bit operating system, ARM-based processor


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Re: [Qgis-user] Qgis on ARM

[Patrick Dunford via Qgis-user]

I checked and some distributions build ARM packages in their own 
repositories, for example Debian does.


On 17/03/22 10:23, Diego García del Río wrote:
indeed.. not even sure if its windows or chromeos or plain linux... 
but not sure if there is anything native for arm



*Diego Garcia del Rio*| CTO | Mediatel S.A. | Tel: +54 11 5218 0463 
(x103) | Cel: +54 9 11 4530-4697 | www.mediatel.com.ar 
<http://www.mediatel.com.ar/> | Juan Carlos Cruz 2360 – 4B (1636), 
Vicente López, Buenos Aires, Argentina |

https://goo.gl/maps/NZCFPwVkFFf14cR67


On Wed, 16 Mar 2022 at 16:45, Patrick Dunford via Qgis-user 
 wrote:


Are packages produced for ARM platforms?

On 17/03/22 05:22, Dave Stevens via Qgis-user wrote:
> On Tue, 15 Mar 2022 16:33:40 -0400
> rayfson souza via Qgis-user  wrote:
>
>> *OLÁ, SAUDAÇÕES, NÃO CONSIGO INSTALAR AS NOVAS VERSÕES DO QGIS 3.22
>> NO MEU NOVO COMPUTADOR, GOSTARIA MUITO DE ME AJUDAR POR FAVOR.*
> *HELLO, GREETINGS, I CANNOT INSTALL THE NEW VERSIONS OF QGIS
3.22 ON MY
> NEW COMPUTER, WOULD LIKE TO HELP ME PLEASE.*
>
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Re: [Qgis-user] (no subject)

[Patrick Dunford via Qgis-user]

If they were running a regular linux distro there could possibly be 
builds if the distro provided the software in their own repository.


However, I half expect it's possibly a chromebook that software installs 
won't be possible on.


On 17/03/22 10:23, Diego García del Río wrote:
indeed.. not even sure if its windows or chromeos or plain linux... 
but not sure if there is anything native for arm



*Diego Garcia del Rio*| CTO | Mediatel S.A. | Tel: +54 11 5218 0463 
(x103) | Cel: +54 9 11 4530-4697 | www.mediatel.com.ar 
<http://www.mediatel.com.ar/> | Juan Carlos Cruz 2360 – 4B (1636), 
Vicente López, Buenos Aires, Argentina |

https://goo.gl/maps/NZCFPwVkFFf14cR67


On Wed, 16 Mar 2022 at 16:45, Patrick Dunford via Qgis-user 
 wrote:


Are packages produced for ARM platforms?

On 17/03/22 05:22, Dave Stevens via Qgis-user wrote:
> On Tue, 15 Mar 2022 16:33:40 -0400
> rayfson souza via Qgis-user  wrote:
>
>> *OLÁ, SAUDAÇÕES, NÃO CONSIGO INSTALAR AS NOVAS VERSÕES DO QGIS 3.22
>> NO MEU NOVO COMPUTADOR, GOSTARIA MUITO DE ME AJUDAR POR FAVOR.*
> *HELLO, GREETINGS, I CANNOT INSTALL THE NEW VERSIONS OF QGIS
3.22 ON MY
> NEW COMPUTER, WOULD LIKE TO HELP ME PLEASE.*
>
> I don't know if there is a qgis-ES list but if so you might get
better
> responses. or Google translate which is what I used.
>
>   Sometimes I wonder
> whether the world is being run by smart people who are putting
us on or
> by imbeciles who really believe it.
>
> Mark Twain
> ___
> Qgis-user mailing list
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Re: [Qgis-user] (no subject)

[Patrick Dunford via Qgis-user]

Are packages produced for ARM platforms?

On 17/03/22 05:22, Dave Stevens via Qgis-user wrote:

On Tue, 15 Mar 2022 16:33:40 -0400
rayfson souza via Qgis-user  wrote:


*OLÁ, SAUDAÇÕES, NÃO CONSIGO INSTALAR AS NOVAS VERSÕES DO QGIS 3.22
NO MEU NOVO COMPUTADOR, GOSTARIA MUITO DE ME AJUDAR POR FAVOR.*

*HELLO, GREETINGS, I CANNOT INSTALL THE NEW VERSIONS OF QGIS 3.22 ON MY
NEW COMPUTER, WOULD LIKE TO HELP ME PLEASE.*

I don't know if there is a qgis-ES list but if so you might get better
responses. or Google translate which is what I used.

  Sometimes I wonder
whether the world is being run by smart people who are putting us on or
by imbeciles who really believe it.

Mark Twain
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Re: [Qgis-user] linux box accessing project-files on a windows server

[Patrick Dunford]

Thanks Richard. It looks like the networking issue is resolved, and they 
now also provide both stable and lts in flatpaks.


On 23/02/22 08:07, Richard Duivenvoorde wrote:

On 2/22/22 02:39, Patrick Dunford wrote:

Hello,

Yes I would say the problem is in the flatpak version of Qgis, since 
I experienced inability to access files over a NFS share.


You would need to find the people who produce the flatpak edition and 
raise this issue with them.


The flathub packager of QGIS is pretty responsive, try to great a 
clear issue here:

https://github.com/flathub/org.qgis.qgis/issues

Regards,

Richard Duivenvoorde

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Re: [Qgis-user] linux box accessing project-files on a windows server

[Patrick Dunford]

Hello,

what steps did you take to map the network share from Windows on your 
Linux Mint computer?


typical steps:

1. create a folder in ~ or in /mnt

2. install the cifs-utils package

3. create an entry in /etc/fstab to mount the samba share to the path 
specified in the first step.


On 21/02/22 23:37, Thomas Struller wrote:


Hallo Nicolas,

thank you for your reply. All my project files are on one network 
drive and I prefer to use geopackages. Perhaps it the problem is, that 
I install qigs from flathub. I’m wondering about that I am the only 
one who uses qgis on linux and want’s to access project-files on a 
windows file server.


Mit freundlichen Grüßen

Thomas Struller

Diplom Geologe (Univ.), BDG, V18

**

*Sachverständiger nach BBodSchG §18,*

*SG1 Historische Recherche*

*SG2 Pfad Boden – Gewässer*

*Akademischer Geoinformatiker*

**

**

Tel:   0049 911 12076 111

Mobil:   0049 170 33 20 494

Mail: thomas.strul...@lga-geo.de

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Re: [Qgis-user] linux box accessing project-files on a windows server

[Patrick Dunford]

Hi,

the /run path in Linux shouldn't be used for file access as it is 
intended for use by applications, not by end users.


If you have a file share to access in Linux, mount it to a path in your 
home folder or perhaps off from /mnt and assign the permissions required 
to access it there.



On 22/02/22 04:49, Richard Greenwood wrote:
I did a quick test. I installed QGIS 3.22 on a Windows 7 computer, 
created a project. Switched to Linux Mint, used the file manager to 
navigate to the Windows computer, double clicked the project and it 
opened correctly. The path that QGIS displays in the properties/info 
panel is:


Path



/run/user/1000/gvfs/smb-share:server=w7,share=c$/Temp/ASSESSOR_ROADS_2018_3.shp

I went back to the Windows computer, exported the shapefile to a gpkg, 
saved the project. Reopened it in Mint, all good. QGIS info for the 
gpkg layer:


Path



/run/user/1000/gvfs/smb-share:server=w7,share=c$/Temp/test.gpkg

I also tested putting the gpkg in a folder below the project file and 
that opened correctly on the Linux computer.
So I suggest that you start with a simple test project. Also, the 
project .qgz file is just a gzipped xml file. So you can unzip it, 
open the .qgs file in a text editor and search for "source=" to see 
what path info has been saved with the project.


Rich

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Re: [Qgis-user] linux box accessing project-files on a windows server

[Patrick Dunford]

Hello,

Yes I would say the problem is in the flatpak version of Qgis, since I 
experienced inability to access files over a NFS share.


You would need to find the people who produce the flatpak edition and 
raise this issue with them.


Are you able to use a native packaged version of Qgis? Running it in a 
virtual machine with a compatible edition of Linux with native Linux 
packages is definitely an option if you can't install any of those 
packages directly in the distribution you are using.


On 21/02/22 23:37, Thomas Struller wrote:


Hallo Nicolas,

thank you for your reply. All my project files are on one network 
drive and I prefer to use geopackages. Perhaps it the problem is, that 
I install qigs from flathub. I’m wondering about that I am the only 
one who uses qgis on linux and want’s to access project-files on a 
windows file server.


Mit freundlichen Grüßen

Thomas Struller

Diplom Geologe (Univ.), BDG, V18

**

*Sachverständiger nach BBodSchG §18,*

*SG1 Historische Recherche*

*SG2 Pfad Boden – Gewässer*

*Akademischer Geoinformatiker*

**

**

Tel:   0049 911 12076 111

Mobil:   0049 170 33 20 494

Mail: thomas.strul...@lga-geo.de

LGA Institut für Umweltgeologie und Altlasten GmbH

Christian-Hessel-Straße 1

90427 Nürnberg

_info@LGA-geo.de_

_www.LGA-geo.de _

__

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[Qgis-user] Keyboard Shortcuts

[Patrick Dunford]

Good day

I am looking at the keyboard shortcuts settings, specifically the 
ability to load a set of shortcuts from a file.


As far as I can tell, there is no global settings or ini file that 
stores all the shortcuts for the software. Instead, there is an option 
to create a file by saving it from the keyboard shortcuts dialog box, 
and this file can then be loaded back in at some future time.


As it looks to me now, I can't see a way in which it might be possible 
to wipe out all the existing settings before loading this file, or 
having the file that is loaded completely replace all of the existing 
shortcuts. In other words, loading that file appears to add to the 
already defined shortcuts.


My preference would be to have some simple way to load all the settings 
from a file to avoid having to manually customise the existing shortcuts 
each time (in this case to remove the three single letter shortcuts that 
appear to be default allocations in the user interface). Is there any 
way of achieving this?


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Re: [Qgis-user] Problème de crash répétitif sur manipulations basiques

[Patrick Dunford]

Try installing 3.22 then see if the problem is still occurring.

I've been getting lots of crashes since going from 3.16.8 to somewhere 
in the tens for no apparent reason, one was reported as a"buffer 
overflow" with no more detail available.


On 8/02/22 22:28, Bernd Vogelgesang wrote:


deepl translates this to:

I would like to contact you because I would like to have additional 
information concerning the use of the software on a laptop.


Indeed, as part of my work, I use QGIS 3.16.11 daily.

Unfortunately, I regularly run into problems with simple operations.

To give you an idea, I regularly copy/paste entities onto the 
corresponding attribute tables, but these sometimes correspond to 
20,000 entities to be copied


My intel core i5 laptop does not support this manipulation and the 
software automatically crashes.


Other tools such as the rastoriel fusion or the vectorial cutting but 
almost impossible with so many entities because either that crashes 
directly or that grinds during a few days to see the end of it.


After having seen with the IT company of our structure, I was asked to 
contact you to know how to solve the problem.


I have already made a number of updates (graphics card, etc) but to no 
avail.


What do you recommend to fix this so that I can use all the features 
of QGIS?


Translated with www.DeepL.com/Translator (free version)


Furthermore: There is a size limit for emails in this list of 100kb. 
Your logos in your email eat up 70kb (!) of this, so my first reply 
with a copy of your entire message already exceeded this limit and got 
blocked.




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Re: [Qgis-user] Readonly gpkg

[Patrick Dunford]

Just as a general comment with GPKG, I am aware there were some concerns 
expressed in this community about issues with this format. Are these 
issues being progressed?


I use spatialite in preference to gpkg in order to work around these issues.

On 1/02/22 06:26, Even Rouault wrote:


Resolution attempt in https://github.com/qgis/QGIS/pull/47098

Even



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Re: [Qgis-user] Trouble in georeferencing

[Patrick Dunford]

Hi, you should read the documentation for this tool, as at least four 
points are needed for a projective transformation.


https://docs.qgis.org/3.16/en/docs/user_manual/working_with_raster/georeferencer.html

This is probably the reason for distortion, but if the original is 
oblique, as implied by the use of the projective transformation, it can 
be hard to mark points accurately.


Output quality depends on the resampling method chosen. It is also of 
course affected by the original quality.


On 31/01/22 06:35, Akanksha Chugh wrote:

1.I clicked on Raster>Georeferencer
2. Open raster>Add points (X and Y)
3. Open Transformation settings
4. Define transformation type as projective, resampling method as 
nearest neighbour, target SRS as EPSG:4326- WGS 84, Compression as 
none and then ok.

5. Start georeferencing.




On Sun, Jan 30, 2022, 10:21 PM Patrick Dunford 
 wrote:


Ok. Can you give us a bit of detail of what you're trying to do.
List the steps that you undertook to get this result.


There are a lot of possible factors that can cause blurring, which
includes the resolution of the source raster, and the
transformation method employed.

Assuming you're using aerial photography, there are technical
factors that can cause visual distortion of distances.

On 31/01/22 02:10, Akanksha Chugh wrote:

Raster>Georeferencer

On Sun, Jan 30, 2022, 6:38 PM Patrick Dunford
 wrote:

Wjat is the name of the tool or plugin you are using.

On 31/01/22 01:25, Akanksha Chugh wrote:
> There appears black area around the image and also it is
stretched out
> and blurred.
>
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Re: [Qgis-user] Trouble in georeferencing

[Patrick Dunford]

Ok. Can you give us a bit of detail of what you're trying to do. List 
the steps that you undertook to get this result.



There are a lot of possible factors that can cause blurring, which 
includes the resolution of the source raster, and the transformation 
method employed.


Assuming you're using aerial photography, there are technical factors 
that can cause visual distortion of distances.


On 31/01/22 02:10, Akanksha Chugh wrote:

Raster>Georeferencer

On Sun, Jan 30, 2022, 6:38 PM Patrick Dunford 
 wrote:


Wjat is the name of the tool or plugin you are using.

On 31/01/22 01:25, Akanksha Chugh wrote:
> There appears black area around the image and also it is
stretched out
> and blurred.
>
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Re: [Qgis-user] Trouble in georeferencing

[Patrick Dunford]

Wjat is the name of the tool or plugin you are using.

On 31/01/22 01:25, Akanksha Chugh wrote:
There appears black area around the image and also it is stretched out 
and blurred.


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Re: [Qgis-user] Drop the points and show only clusters

[Patrick Dunford]

Sorry, I am not experienced in using this. The programmers who wrote it 
might be able to assist you on the Qgis user list.


On 28/01/22 14:58, krishna Ayyala wrote:


Patrick,
Thank you for sending the weblink. I watched the video. I was able to 
get up to the layer styling step. But,I am unable to figure out how to 
accomplish this task. I am herewith attaching the sample data of 1000 
points. When you get a chance, can you please guide me the steps so 
that  I will have  only those points that are within 1000ft of each 
other and drop the rest of the points?


Regards.

On Thu, Jan 27, 2022 at 2:23 PM Patrick Dunford 
 wrote:


Hi, a point cluster renderer is available in layer styling

Have a look at this web site


https://anitagraser.com/2017/06/13/even-more-aggregations-qgis-point-cluster-renderer/


On 28/01/22 09:25, krishna Ayyala wrote:
> Hello,
> I have a point shape with about 10,000 points. On the map, I
wish to
> show only those points that are within 1000ft of each other and
drop
> the rest of the points. All I am trying to see is only the
clusters.
> Can anyone help please?
>
> Regards.
>
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Re: [Qgis-user] Drop the points and show only clusters

[Patrick Dunford]

Hi, a point cluster renderer is available in layer styling

Have a look at this web site

https://anitagraser.com/2017/06/13/even-more-aggregations-qgis-point-cluster-renderer/


On 28/01/22 09:25, krishna Ayyala wrote:

Hello,
I have a point shape with about 10,000 points. On the map, I wish to 
show only those points that are within 1000ft of each other and drop 
the rest of the points. All I am trying to see is only the clusters. 
Can anyone help please?


Regards.

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Re: [Qgis-user] wfs problems

[Patrick Dunford]

I am interested in your comment because I have noticed WFS is buggier 
than WMTS sources in Qgis.


I never have any trouble with WMTS, but with WFS, there is very often an 
issue of missing tiles that Qgis will not download from the server.


On 29/08/18 6:34 pm, Juerg Lindauer wrote:

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[Qgis-user] Refreshing user interface during script execution

[Patrick Dunford]

Good day

I have a script that runs a number of processing steps that take a long 
time to execute and during this execution the only way I can display 
progress messages is by printing to the Python scripting console.


I would prefer to be using the message bar to display the messages but 
the screen does not update meaning these messages are not displayed. 
They only get displayed if there is also a print statement sending 
output to the console. The other parts of the user interface also do not 
update.


Using the message interface like this:

iface.messageBar().pushMessageOr perhaps using the status bar 
iface.statusBarIface().showMessage("Processed {}%".format(int(percent))) 
They all have the same basic issue. I also want to know how I can 
interrupt the script execution when it is running, at the moment the 
only option I have is to kill the Qgis application.





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Re: [Qgis-user] Expression to read field value from composer layout?

[Patrick Dunford]

Thanks for that. I also found a tutorial by Nathan Woodrow which 
explains how to do custom functions.


https://woostuff.wordpress.com/2015/05/21/accessing-composer-item-properties-via-custom-expressions-in-qgis/

On 5/08/21 12:51 am, Stefan Giese (WhereGroup) wrote:


here is a function which does the job. It's a bit more generic, you 
have to pass the layoutname and the itemID to get the text:


/from qgis.core import *//
//from qgis.gui import *//
//
//@qgsfunction(args='auto', group='Custom')//
//def get_layout_textitem(layoutTitle, itemId, feature, parent)://
//    """//
//    Gets the text from a labelitem in the layout with the name 
layoutTitle.//

//    Example usage://
//    //
//  get_layout_textitem('Layout 1', 'text1') -> 'lorem 
ipsum//

//    //
//    """//
//
//    project = QgsProject.instance()//
//    projectLayoutManager = project.layoutManager()//
//    layout = projectLayoutManager.layoutByName(layoutTitle)//
//
//    fileNameLabel = layout.itemById(itemId)//
//    fileNameText = fileNameLabel.text() //
//    return fileNameText/

//

Am 04.08.2021 um 14:06 schrieb Patrick Dunford:

layoutTitle = "Landscape 16:9 Header Nav Copyright Filename 2021"

project = QgsProject.instance()
projectLayoutManager = project.layoutManager()
layout = projectLayoutManager.layoutByName(layoutTitle)

fileNameLabel = layout.itemById('Filename')
fileNameText = fileNameLabel.text() 

--
Mit freundlichen Grüßen
Stefan Giese
Projektleiter/Consultant

Aufbau von Geodateninfrastrukturen mit Open-Source-Software
FOSS Academy 5 Tage-Kompaktkurs „Sommerschule 2021“
Jetzt anmelden:https://foss-academy.com/kompaktkurse/  
*

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Re: [Qgis-user] Expression to read field value from composer layout?

[Patrick Dunford]

OK

Is it then possible I might have to write my own function to get the 
values from the Qgis API?


I already have a Python script that runs in the main window console that 
contains this code


layoutTitle = "Landscape 16:9 Header Nav Copyright Filename 2021"

project = QgsProject.instance()
projectLayoutManager = project.layoutManager()
layout = projectLayoutManager.layoutByName(layoutTitle)

fileNameLabel = layout.itemById('Filename')
fileNameText = fileNameLabel.text()

How would I adapt that to a custom function in the Function Editor and 
assuming it is for the current layout.


Thanks

On 4/08/21 11:44 pm, Stefan Giese (WhereGroup) wrote:


Hi Patrick,

I think that you can not get the text from the label with the 
item_variables function. The keys are limited to the predefinded 
variables like:


_project_transform_context,item_id,item_uuid,layer_ids,layers,layout_dpi,layout_name,layout_numpages,layout_page,layout_pageheight,layout_pageoffsets,layout_pagewidth,miles_km,project_abstract,project_area_units,project_author,project_basename,project_creation_date,project_crs,project_crs_acronym,project_crs_definition,project_crs_description,project_crs_ellipsoid,project_crs_proj4,project_crs_wkt,project_distance_units,project_ellipsoid,project_filename,project_folder,project_home,project_identifier,project_keywords,project_last_saved,project_path,project_title,project_units,qgis_locale,qgis_os_name,qgis_platform,qgis_release_name,qgis_short_version,qgis_version,qgis_version_no,test,user_account_name,user_full_name

But you can use your own variable like filename and access it from 
anywhere:




Am 04.08.2021 um 13:27 schrieb Patrick Dunford:


I'm looking through the documentation and there is this example:


  14.2.2.13. Layout Functions
  
<https://docs.qgis.org/3.10/en/docs/user_manual/working_with_vector/expression.html#id24>

This group contains functions to manipulate print layout items 
properties.


Function



Description

item_variables



Returns a map of variables from a layout item inside this print layout

*An example:*

 *

Get the scale of the ‘Map 0’ in the current print layout:

map_get(  item_variables('Map 0'),  'map_scale')


How do I find out how to get the text value of the layout item 
"Filename" on the current print layout?



On 4/08/21 2:40 pm, Patrick Dunford wrote:
It is just an ordinary text field on a composer layout I think. I 
don't use the atlas functionality.


On 4/08/21 10:19 am, Nyall Dawson wrote:
On Wed, 4 Aug 2021 at 06:17, Patrick Dunford 
 wrote:

Good day

I am wishing to create a value in a field on a composer layout that
reads the value of another field on the layout and calculates a 
value to

be displayed.

For example, I have an existing field called Filename on the 
layout and
in a python script running in the main window console, I have this 
code

that reads the value of the Filename field as follows:

layoutTitle = "Landscape 16:9 Header Nav Copyright Filename 2021"

project = QgsProject.instance()
projectLayoutManager = project.layoutManager()
layout = projectLayoutManager.layoutByName(layoutTitle)

fileNameLabel = layout.itemById('Filename')
fileNameText = fileNameLabel.text()


Obviously I am hoping that doing this from a field within the layout
that reads another field on the same layout will be much simpler than
the above. How exactly would I achieve that?

Just to clarify -- by "field" do you mean "a field value from the
atlas layer", or "a text label item"?

Nyall


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--
Mit freundlichen Grüßen
Stefan Giese
Projektleiter/Consultant

Aufbau von Geodateninfrastrukturen mit Open-Source-Software
FOSS Academy 5 Tage-Kompaktkurs „Sommerschule 2021“
Jetzt anmelden:https://foss-academy.com/kompaktkurse/  
*

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79100 Freiburg
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Fon: +49 (0)761 / 519 102 - 61
Fax: +49 (0)761 / 519 102 - 11

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Re: [Qgis-user] Expression to read field value from composer layout?

[Patrick Dunford]

I'm looking through the documentation and there is this example:


 14.2.2.13. Layout Functions
 
<https://docs.qgis.org/3.10/en/docs/user_manual/working_with_vector/expression.html#id24>

This group contains functions to manipulate print layout items properties.

Function



Description

item_variables



Returns a map of variables from a layout item inside this print layout

*An example:*

 *

   Get the scale of the ‘Map 0’ in the current print layout:

   map_get(  item_variables('Map 0'),  'map_scale')


How do I find out how to get the text value of the layout item 
"Filename" on the current print layout?



On 4/08/21 2:40 pm, Patrick Dunford wrote:
It is just an ordinary text field on a composer layout I think. I 
don't use the atlas functionality.


On 4/08/21 10:19 am, Nyall Dawson wrote:
On Wed, 4 Aug 2021 at 06:17, Patrick Dunford 
 wrote:

Good day

I am wishing to create a value in a field on a composer layout that
reads the value of another field on the layout and calculates a 
value to

be displayed.

For example, I have an existing field called Filename on the layout and
in a python script running in the main window console, I have this code
that reads the value of the Filename field as follows:

layoutTitle = "Landscape 16:9 Header Nav Copyright Filename 2021"

project = QgsProject.instance()
projectLayoutManager = project.layoutManager()
layout = projectLayoutManager.layoutByName(layoutTitle)

fileNameLabel = layout.itemById('Filename')
fileNameText = fileNameLabel.text()


Obviously I am hoping that doing this from a field within the layout
that reads another field on the same layout will be much simpler than
the above. How exactly would I achieve that?

Just to clarify -- by "field" do you mean "a field value from the
atlas layer", or "a text label item"?

Nyall
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Re: [Qgis-user] Expression to read field value from composer layout?

[Patrick Dunford]

It is just an ordinary text field on a composer layout I think. I don't 
use the atlas functionality.


On 4/08/21 10:19 am, Nyall Dawson wrote:

On Wed, 4 Aug 2021 at 06:17, Patrick Dunford  wrote:

Good day

I am wishing to create a value in a field on a composer layout that
reads the value of another field on the layout and calculates a value to
be displayed.

For example, I have an existing field called Filename on the layout and
in a python script running in the main window console, I have this code
that reads the value of the Filename field as follows:

layoutTitle = "Landscape 16:9 Header Nav Copyright Filename 2021"

project = QgsProject.instance()
projectLayoutManager = project.layoutManager()
layout = projectLayoutManager.layoutByName(layoutTitle)

fileNameLabel = layout.itemById('Filename')
fileNameText = fileNameLabel.text()


Obviously I am hoping that doing this from a field within the layout
that reads another field on the same layout will be much simpler than
the above. How exactly would I achieve that?

Just to clarify -- by "field" do you mean "a field value from the
atlas layer", or "a text label item"?

Nyall

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Re: [Qgis-user] Expression to read field value from composer layout?

[Patrick Dunford]

What's an atlas layer? I don't use the atlas functionality.


On 4/08/21 10:19 am, Nyall Dawson wrote:

On Wed, 4 Aug 2021 at 06:17, Patrick Dunford  wrote:

Good day

I am wishing to create a value in a field on a composer layout that
reads the value of another field on the layout and calculates a value to
be displayed.

For example, I have an existing field called Filename on the layout and
in a python script running in the main window console, I have this code
that reads the value of the Filename field as follows:

layoutTitle = "Landscape 16:9 Header Nav Copyright Filename 2021"

project = QgsProject.instance()
projectLayoutManager = project.layoutManager()
layout = projectLayoutManager.layoutByName(layoutTitle)

fileNameLabel = layout.itemById('Filename')
fileNameText = fileNameLabel.text()


Obviously I am hoping that doing this from a field within the layout
that reads another field on the same layout will be much simpler than
the above. How exactly would I achieve that?

Just to clarify -- by "field" do you mean "a field value from the
atlas layer", or "a text label item"?

Nyall

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[Qgis-user] Expression to read field value from composer layout?

[Patrick Dunford]

Good day

I am wishing to create a value in a field on a composer layout that 
reads the value of another field on the layout and calculates a value to 
be displayed.


For example, I have an existing field called Filename on the layout and 
in a python script running in the main window console, I have this code 
that reads the value of the Filename field as follows:


layoutTitle = "Landscape 16:9 Header Nav Copyright Filename 2021"

project = QgsProject.instance()
projectLayoutManager = project.layoutManager()
layout = projectLayoutManager.layoutByName(layoutTitle)

fileNameLabel = layout.itemById('Filename')
fileNameText = fileNameLabel.text()


Obviously I am hoping that doing this from a field within the layout 
that reads another field on the same layout will be much simpler than 
the above. How exactly would I achieve that?


Thanks in advance.

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[Qgis-user] Info: Linz Data Service plugin

[Patrick Dunford]

Since June 30, 2021, Land Information New Zealand is advising its users 
of the Linz Data Service Plugin for Qgis 3.x. Instructions for use of 
the plugin available from the Linz Data Service website:


https://www.linz.govt.nz/data/linz-data-service/guides-and-documentation/using-the-linz-data-importer-plugin-in-qgis

(This email does not in any way impute any official representation of 
Land Information New Zealand or Linz Data Service)


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Re: [Qgis-user] plugin integration/interaction with layout window?

[Patrick Dunford]

Thankyou for your reply

I suppose there are potentially many solutions I could look at for my 
particular situation, one of those might be writing my own private 
plugin which will give me the capability to get a toolbar button from 
which it can then call my script if the script code is copied into the 
plugin.


Questions are mostly along the lines

- are there any differences in the way a script interacts with a running 
application when the script is incorporated into a plugin


- can a custom toolbar or button be added in the Layout window (using 
the code example shown for ch16 of the pyqgis cookbook)


- can a script or plugin place a message in the message bar of a Layout 
window instead of the main application window


On 29/06/21 7:26 pm, Luigi Pirelli wrote:

Hi Patrick

seems more a question for the developer list where many UX involved 
people can give you opinions.


Luigi Pirelli

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On Tue, 29 Jun 2021 at 05:48, Patrick Dunford <mailto:enzedrailm...@gmail.com>> wrote:


Just have a question here about the use of separate application
windows
for the Qgis application main window and the Layout window. Obviously
the separate layout windows can be multiple in number whereas most of
the time we only need one application main window open.

However for me there is the question of having different toolbars and
panels available in the two different types of window. Whilst they do
fulfill different functions of the application, the crossover between
those functions that is easy to achieve when running a script
somewhat
blurs the merits of separate windows and raises the question of why
panels and toolbars can only be used in one or the other windows
but not
both.

In other words should you have the two distinct types of window or
one
window that can have a combination of panels and toolbars from
anywhere.
Granted that that would be a challenge if implemented to its fullest
extent since most of the panels and toolbars are specific to each
window
type and the canvas would have to become some sort of panel as well.

My view on this is mostly driven by the apparently reasonable
conclusion
that the Python scripting console panel should not be limited to only
being able to be docked to the application main window instead of the
layout window as is currently the case. I have a script that
performs a
layout export to image and I have to keep switching backwards and
forwards between the main window and the layout window to run the
script, which can be for hundreds of export operations in a day. The
script itself reduces the number of mouse clicks needed to run
each of
the individual exports by automatically selecting the layers to
make up
an export in the main window.

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Re: [Qgis-user] Multiple lines issue in labelling

[Patrick Dunford]

It comes down to a perspective of how intuitive a UI feature should be.

The placement tab is a new feature in recent versions of Qgis and that's 
down to a subjective classification of things into "placement" options 
or whether there is a better way of classifying the settings that keeps 
them together in the same tab of the dialog.


You could put a message above the multiline section saying " this 
section is disabled because curved has been selected in other tab" or 
words to that effect.


On 27/06/21 6:51 pm, DelazJ wrote:


Hi,
These are quite different features I can't see how they would stay in 
the same tab, despite I understand your point.
Anyway, note that the multilinear options are disabled because these 
functionalities are not YET implemented for curved labels. See 
https://github.com/qgis/QGIS-Enhancement-Proposals/issues/62 
<https://github.com/qgis/QGIS-Enhancement-Proposals/issues/62>


Regards,
Harrissou

Le 25 juin 2021 04:43:11 GMT+02:00, Patrick Dunford 
 a écrit :


Yes it was set with that.

This does raise a question of the software design. I got an
introductory course in interface design many years ago, and we
were taught a control that enables or disables a part of a user
interface should not be placed in a different page of a multi
tabbed dialog.

On 25/06/21 1:08 am, DelazJ wrote:

Hi Patrick,
Do you set a curved placement for the labels?

Harrissou

Le jeu. 24 juin 2021 à 13:22, Patrick Dunford
mailto:enzedrailm...@gmail.com>> a écrit :

Good day

I have used the multiple lines feature in labelling some of
my layers.
However for some inexplicable reason this section in some
layers is
grayed out (disabled) and cannot be accessed.

All layers are Spatialite but this should have no relevance
as the
labelling settings are stored in the project file rather than
with the
layers data files.

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[Qgis-user] Separate or combined windows for Qgis canvas and Layout (or being able to dock the Python scripting console panel to a Layout window)

[Patrick Dunford]

Just have a question here about the use of separate application windows 
for the Qgis application main window and the Layout window. Obviously 
the separate layout windows can be multiple in number whereas most of 
the time we only need one application main window open.


However for me there is the question of having different toolbars and 
panels available in the two different types of window. Whilst they do 
fulfill different functions of the application, the crossover between 
those functions that is easy to achieve when running a script somewhat 
blurs the merits of separate windows and raises the question of why 
panels and toolbars can only be used in one or the other windows but not 
both.


In other words should you have the two distinct types of window or one 
window that can have a combination of panels and toolbars from anywhere. 
Granted that that would be a challenge if implemented to its fullest 
extent since most of the panels and toolbars are specific to each window 
type and the canvas would have to become some sort of panel as well.


My view on this is mostly driven by the apparently reasonable conclusion 
that the Python scripting console panel should not be limited to only 
being able to be docked to the application main window instead of the 
layout window as is currently the case. I have a script that performs a 
layout export to image and I have to keep switching backwards and 
forwards between the main window and the layout window to run the 
script, which can be for hundreds of export operations in a day. The 
script itself reduces the number of mouse clicks needed to run each of 
the individual exports by automatically selecting the layers to make up 
an export in the main window.


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Re: [Qgis-user] Blacks screen after opening attribute table

[Patrick Dunford]

If you know it's a profile specific issue then create a new profile and 
see it it goes away



I don't know of any way to debug specific issues with profiles so often 
the solution is just to create a new one.



On 24/06/21 8:21 am, Nomsa Mwayenga wrote:


Hi. I am having issues with my main profile. I am using v3.16.
For the past week, if i open the attribute table of any layer, the 
attribute table opens by my QGIS hangs and i get a black screen. I am 
able to navigate within the attribute table but cannot get back to the 
main view since it will just be a black screen. When that happens, i 
will need to switch profiles or restart QGIS.

I have tried deleting the last plugins I added but this hasn't helped.
Can anyone assist?


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Re: [Qgis-user] Multiple lines issue in labelling

[Patrick Dunford]

Yes it was set with that.

This does raise a question of the software design. I got an introductory 
course in interface design many years ago, and we were taught a control 
that enables or disables a part of a user interface should not be placed 
in a different page of a multi tabbed dialog.


On 25/06/21 1:08 am, DelazJ wrote:

Hi Patrick,
Do you set a curved placement for the labels?

Harrissou

Le jeu. 24 juin 2021 à 13:22, Patrick Dunford <mailto:enzedrailm...@gmail.com>> a écrit :


Good day

I have used the multiple lines feature in labelling some of my
layers.
However for some inexplicable reason this section in some layers is
grayed out (disabled) and cannot be accessed.

All layers are Spatialite but this should have no relevance as the
labelling settings are stored in the project file rather than with
the
layers data files.

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[Qgis-user] Multiple lines issue in labelling

[Patrick Dunford]

Good day

I have used the multiple lines feature in labelling some of my layers. 
However for some inexplicable reason this section in some layers is 
grayed out (disabled) and cannot be accessed.


All layers are Spatialite but this should have no relevance as the 
labelling settings are stored in the project file rather than with the 
layers data files.


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[Qgis-user] Fix pasted features conflicts dialog for OGC_FID field ?????

[Patrick Dunford]

Here is the dialog box that results for multiple conflicts in a paste of 
features with the OGC_FID field in a spatialite layer:


The only possible fix is to delete the value in OGC_FID and leave it to 
be autogenerated. This works for a single feature being pasted. But for 
multiples, there is no way to get that accepted and move on to the next 
conflicting feature. Therefore making it impossible to fix multiple 
paste conflicts.




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[Qgis-user] FID issues with GPKG / Spatialite

[Patrick Dunford]

To add further to the conversation about issues with conflicting FID 
fields in GPKGs.


This issue seems to be partly resolved with spatialite layers which begs 
the question of how it is not possible to have a similar automagical 
resolution capability implemented with GPKG so I suppose that must be 
down to the driver implementation from the external library (GDAL or 
something)?


Spatialite will sometimes (not always) generate a dialog box that gives 
the ability to automatically fix the problem. But it seems to be 
inconsistent; the attachment shows a time when the OK button is 
unavailable, meaing the automatic fix cannot be used.


So whilst it is great to have the automatic fix capability in spatialite 
there are times when it doesn't work either.



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Re: [Qgis-user] satellite basemap of New York city for qgis2web

[Patrick Dunford]

I don't use qgis2web. I use the XYZ tiles export tools in the processing 
toolbox to create tiles of my maps, which then go onto a fairly ordinary 
apache/php server with Leaflet running in the front end. Leaflet pulls 
in a WMTS layer aerial background in a very straightforward way.


HTML and javascript are not that hard to code with, for any of these 
solutions.


On 8/03/21 5:33 am, Stephen Sacks wrote:
Thanks Phil for your reply.  My knowledge of html and Java is 
minimal.  I need  qgis2web to write it for me.   I got an aerial view 
from Mapbox  that looks OK with my polygon and point layers in my 
desktop QGIS.  But qgis2web crashes unless I select OpenLayers or 
Leaflet.  When I send the qgis2web output files to my web host 
(infinityFree) the aerial view layer is missing. (You can see it at 
www.temp5.epizy.com, showing a few of the 35 gardens along Brooklyn's 
Promenade.) I hope a DoITT  aerial view will work with qgis2web.  I've 
tried geoServer but can't figure out how to make it give me a DoITT  map.



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Re: [Qgis-user] Detail-level of exported maps

[Patrick Dunford]

You can control the display of labels in the GIS and composer by 
specifying scale based rules for labelling


On 5/02/21 2:01 am, Frederik Franke wrote:


Dear QGIS users,

I’m relatively new to QGIS and need a quick help to export a map (as 
pdf) from the QGIS composer.


My map contains an OpenStreetMap background map and I have the problem 
that the exported OpenStreetMap is much too detailed (e.g. hundreds of 
village names are included with a very small font size). When I change 
the export resolution from 300 dpi to 72 dpi in the composer I can 
circumvent this problem. Only big cities are labeled now and the city 
names are in an appropriate size. Unfortunately the map has a very bad 
resolution now (I can see single pixels when I set the pdf-zoom factor 
to 100 percent).


How can I export a map with a lower detail-level but a good resolution?

Thanks and best

Fred


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Re: [Qgis-user] File based Geopackage bugs

[Patrick Dunford]

Thanks for you comment, however I did not see a reference to the issue 
of data loss when changing table structure (dropping columns etc).


On 3/02/21 11:36 am, Nyall Dawson wrote:

On Tue, 2 Feb 2021 at 12:12, Patrick Dunford  wrote:

I recall going back someway we were sold this Geopackage idea being
implemented into Qgis because it was going to be so much better than
shape files that everyone has been using up to now. I bought into these
ideas by converting shape files in most of my Qgis projects into
Geopackage files.

However there appear to be some serious bugs in Qgis' implementation of
Geopackages as a file based system, and since SQlite has an impeccable
reputation, it is a reasonable conclusion that there must be significant
uncorrected bugs in the Qgis code that deals with file based Geopackages.


Please have a read over the threads at
https://lists.osgeo.org/pipermail/qgis-developer/2020-March/060584.html
and  https://lists.osgeo.org/pipermail/qgis-developer/2020-May/061162.html

All your issues were discussed at length in those threads -- so
there's lots of background info there. Suffice to say, as you've
realised, many of the issues are still outstanding and yes, geopackage
can be a pain (a nightmare?) to use for some workflows.

Nyall



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Re: [Qgis-user] File based Geopackage bugs

[Patrick Dunford]

Hi Bernd

Thanks for your comments

As a previous commenter wrote, Spatialite also uses a similar format to 
Geopackage being also based on SQLite.


So far in my testing of Spatialite I have found it to have neither 
issue. Spatialite converted from Geopackage creates another field called 
ogc_fid and ignores the fid field from the Geopackage. A test paste 
resulted in the ogc_fid values being automatically updated to new ones 
when the table is posted.


I dropped several columns in a table with 38,000 records and saw no data 
loss with Spatialite, either.


I still have to test with 2.18 and the newest master to see how they 
work with geopackage files before filing a bug report.


I guess a question is whether the server based implementation of 
Geopackage has these issues.


On 3/02/21 3:06 am, Bernd Vogelgesang wrote:

for 2. I found a "workaround":
As far as I remember, copy/paste works, but when trying to save, you get
this warning/error.

In the attribute table, I pick the "fid" column, enter "$id" and perform
"update all". After that the layer can be saved.

A novice user will never come to that solution by itself, so this a real
show stopper for gpkg.


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Re: [Qgis-user] File based Geopackage bugs

[Patrick Dunford]

I filed a bug report last week for the second problem, but it surely 
must have been previously reported.


On 3/02/21 3:06 am, Bernd Vogelgesang wrote:

for 2. I found a "workaround":
As far as I remember, copy/paste works, but when trying to save, you get
this warning/error.

In the attribute table, I pick the "fid" column, enter "$id" and perform
"update all". After that the layer can be saved.

A novice user will never come to that solution by itself, so this a real
show stopper for gpkg.

Am 02.02.21 um 03:11 schrieb Patrick Dunford:

I recall going back someway we were sold this Geopackage idea being
implemented into Qgis because it was going to be so much better than
shape files that everyone has been using up to now. I bought into
these ideas by converting shape files in most of my Qgis projects into
Geopackage files.

However there appear to be some serious bugs in Qgis' implementation
of Geopackages as a file based system, and since SQlite has an
impeccable reputation, it is a reasonable conclusion that there must
be significant uncorrected bugs in the Qgis code that deals with file
based Geopackages.

Here are two examples:

1. Changing the data table associated with a layer, specifically the
operation of deleting columns, is almost 100% guaranteed to result in
automatic deletion of 100% of the features in the layer when the layer
is saved. I have seen this happen multiple times, whether in a layer
with 92 features or one with half a million.

2. Compared to shapefiles, Geopackages add an extra field called a fid
which is a unique numerical value. For new records, this value is
automatically generated. This requirement of uniqueness and the field
apparently being unchangeable by the end user makes it impossible to
paste features from another table if the values in the fid field for
pasted features happen to coincide with existing entries in the table.

These two examples are making me consider changing back to shapefiles
in all my projects because shapefiles did not cause either of these
two problems. Supposedly a shapefile is more prone to data corruption.
This may be the case but as the code in Qgis that deals with
shapefiles appears to be considerably more mature, these
considerations have to be reasonably weighed against each other.

Particularly in the case of issue 1, this appears to be a regression
since I do not recall it being an issue on Qgis 2.18 or possibly
earlier versions of Qgis 3. (I use the LTS edition of Qgis)

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[Qgis-user] File based Geopackage bugs

[Patrick Dunford]

I recall going back someway we were sold this Geopackage idea being 
implemented into Qgis because it was going to be so much better than 
shape files that everyone has been using up to now. I bought into these 
ideas by converting shape files in most of my Qgis projects into 
Geopackage files.


However there appear to be some serious bugs in Qgis' implementation of 
Geopackages as a file based system, and since SQlite has an impeccable 
reputation, it is a reasonable conclusion that there must be significant 
uncorrected bugs in the Qgis code that deals with file based Geopackages.


Here are two examples:

1. Changing the data table associated with a layer, specifically the 
operation of deleting columns, is almost 100% guaranteed to result in 
automatic deletion of 100% of the features in the layer when the layer 
is saved. I have seen this happen multiple times, whether in a layer 
with 92 features or one with half a million.


2. Compared to shapefiles, Geopackages add an extra field called a fid 
which is a unique numerical value. For new records, this value is 
automatically generated. This requirement of uniqueness and the field 
apparently being unchangeable by the end user makes it impossible to 
paste features from another table if the values in the fid field for 
pasted features happen to coincide with existing entries in the table.


These two examples are making me consider changing back to shapefiles in 
all my projects because shapefiles did not cause either of these two 
problems. Supposedly a shapefile is more prone to data corruption. This 
may be the case but as the code in Qgis that deals with shapefiles 
appears to be considerably more mature, these considerations have to be 
reasonably weighed against each other.


Particularly in the case of issue 1, this appears to be a regression 
since I do not recall it being an issue on Qgis 2.18 or possibly earlier 
versions of Qgis 3. (I use the LTS edition of Qgis)


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[Qgis-user] Qgis startup crashes on Debian 10

[Patrick Dunford]

Again as we saw with builds earlier this year, the latest 3.10.11 build 
will crash on startup. This happens on anything I can find running 
Debian 10.


There aren't seen anything similar on Ubuntu.

Is there likely to be some sort of issue with the build environment that 
affects Debian 10 compatibility?


The below is a K crash dump.

Application: qgis (qgis), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7feb14a2ce40 (LWP 11173))]

Thread 8 (Thread 0x7feafc8bd700 (LWP 11185)):
#0  0x7feb1d38f3f9 in pthread_cond_timedwait@@GLIBC_2.3.2 () from 
/lib/x86_64-linux-gnu/libpthread.so.0
#1  0x7feb1d9490fc in QWaitCondition::wait(QMutex*, unsigned long) 
() from /lib/x86_64-linux-gnu/libQt5Core.so.5

#2  0x7feb1d9411f2 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x7feb1d948a67 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x7feb1d388fa3 in start_thread () from 
/lib/x86_64-linux-gnu/libpthread.so.0

#5  0x7feb1d49d4cf in clone () from /lib/x86_64-linux-gnu/libc.so.6

Thread 7 (Thread 0x7feafd0be700 (LWP 11184)):
[KCrash Handler]
#6  0x7feb1df11b84 in ?? () from 
/lib/x86_64-linux-gnu/libQt5Network.so.5
#7  0x7feb1df10c49 in ?? () from 
/lib/x86_64-linux-gnu/libQt5Network.so.5
#8  0x7feb1db1a072 in QObject::event(QEvent*) () from 
/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x7feb20c2d4c1 in QApplicationPrivate::notify_helper(QObject*, 
QEvent*) () from /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#10 0x7feb20c34970 in QApplication::notify(QObject*, QEvent*) () 
from /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#11 0x7feb246c680b in QgsApplication::notify(QObject*, QEvent*) () 
from /lib/libqgis_core.so.3.10.11
#12 0x7feb1daf0489 in QCoreApplication::notifyInternal2(QObject*, 
QEvent*) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x7feb1daf346b in 
QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) 
() from /lib/x86_64-linux-gnu/libQt5Core.so.5

#14 0x7feb1db42103 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x7feb1bbc0f2e in g_main_context_dispatch () from 
/lib/x86_64-linux-gnu/libglib-2.0.so.0

#16 0x7feb1bbc11c8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x7feb1bbc125c in g_main_context_iteration () from 
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#18 0x7feb1db41727 in 
QEventDispatcherGlib::processEvents(QFlags) 
() from /lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x7feb1daef15b in 
QEventLoop::exec(QFlags) () from 
/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x7feb1d93ee76 in QThread::exec() () from 
/lib/x86_64-linux-gnu/libQt5Core.so.5

#21 0x7feb1d948a67 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x7feb1d388fa3 in start_thread () from 
/lib/x86_64-linux-gnu/libpthread.so.0

#23 0x7feb1d49d4cf in clone () from /lib/x86_64-linux-gnu/libc.so.6

Thread 6 (Thread 0x7feafd8bf700 (LWP 11183)):
#0  0x7feb1d492819 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x7feb1bbc1136 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x7feb1bbc125c in g_main_context_iteration () from 
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x7feb1db41743 in 
QEventDispatcherGlib::processEvents(QFlags) 
() from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x7feb1daef15b in 
QEventLoop::exec(QFlags) () from 
/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x7feb2488e3d0 in QgsNetworkContentFetcherTask::run() () from 
/lib/libqgis_core.so.3.10.11
#6  0x7feb2499a262 in QgsTask::start() () from 
/lib/libqgis_core.so.3.10.11

#7  0x7feb1d940fe1 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x7feb1d948a67 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x7feb1d388fa3 in start_thread () from 
/lib/x86_64-linux-gnu/libpthread.so.0

#10 0x7feb1d49d4cf in clone () from /lib/x86_64-linux-gnu/libc.so.6

Thread 5 (Thread 0x7feafe15f700 (LWP 11182)):
#0  0x7feb1d48e537 in write () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x7feb1bc06b5a in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x7feb1daf39b5 in QCoreApplication::postEvent(QObject*, QEvent*, 
int) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x7feb1db1954a in QMetaObject::activate(QObject*, int, int, 
void**) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x7feb1df37c64 in 
QNetworkConfigurationManagerPrivate::updateConfigurations() () from 
/lib/x86_64-linux-gnu/libQt5Network.so.5
#5  0x7feb1dfc470d in ?? () from 
/lib/x86_64-linux-gnu/libQt5Network.so.5
#6  0x7feb1db1a072 in QObject::event(QEvent*) () from 
/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x7feb1daf0466 in QCoreApplication::notifyInternal2(QObject*, 
QEvent*) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x7feb1daf346b in 
QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) 
() from /lib/x86_64-linux-gnu/libQt5Core.so.5

#9  0x7feb1db42103 in ?

[Qgis-user] Geopackage file data loss issue

[Patrick Dunford]

Good day

In most of my file-based projects I have converted all the shapefiles 
into geopackages as this is supposed to be better these days and I am 
sure with a database based format there should be significant overall 
benefits of stability etc of the data stored within these layers.


However there does seem to be a major problem with Qgis in the way it 
handles errors from rejecting a change in the database table structure, 
specifically adding and removing columns. This appears to consistently 
result in all of the records of the table disappearing from view into 
temporary files associated with the database, from which they cannot 
actually be retrieved by the user.


In the case of the layer shown in the attached picture, this has SHM and 
WAL files open that, according to the Sqlite specification, should 
contain unposted data from the table, but the end user has no way of 
forcing this data to be committed in this situation in which, in this 
case, an alter table or similar type of operation was rejected by the 
Sqlite library. Leaving 181 features in what appears to be a temporary 
table within the database and rendering the main data table (the first 
one in the list) in practice having no rows in it.


There appear to be two issues: 1. the rejected data processing operation 
on the table, 2. the error recovery coded into Qgis when a situation 
like this comes about, in this case I have cancelled the post (save) 
operation on the geopackage, this should have rolled back the database 
to its previous state prior to attempting the data processing operation, 
but instead of this roll back taking place the table is left in this 
inconsistent state from which the user is unable to retrieve their data.


Specifically (1)

a. Qgis will treat a table's field names as case sensitive so that 
styles that apply to a field that are copied between otherwise similar 
tables will not apply to the field in the table they are copied to if 
that field has one letter that is different case from the original. This 
behaviour is not consistent with the Sqlite data engine behaviour which 
does not distinguish between case sensitive names of fields so that 
attempting to rename the field will be rejected by the Sqlite layer 
resulting in potential data loss in the table due to Qgis's failure to 
handle the error situation properly.


b. I have seen a number of situations where attempting just to delete 
some columns out of a table will be rejected by the Sqlite layer for 
unknown reason, resulting in the same problem.




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Re: [Qgis-user] NO_PUBKEY F7E06F06199EF2F2

[Patrick Dunford]

The instructions on the Qgis website have been updated for downloading 
the key, presumably because a new key has been produced.


New instructions:


wget  -qO  -  https://qgis.org/downloads/qgis-2020.gpg.key  |  sudo  gpg  
--no-default-keyring  --keyring  
gnupg-ring:/etc/apt/trusted.gpg.d/qgis-archive.gpg  --import
sudo  chmod  a+r  /etc/apt/trusted.gpg.d/qgis-archive.gpg

On 15/08/20 3:25 am, Stephen Knox wrote:

Fernando M. Roxo da Motta wrote
>/$ sudo apt-key adv --keyserver keyserver.ubuntu.com 
 --recv-keys />/F7E06F06199EF2F2 Executing: /tmp/apt-key-gpghome.o5WmiyZOcR/gpg.1.sh 
 />/--keyserver keyserver.ubuntu.com  
--recv-keys F7E06F06199EF2F2 gpg: />/keyserver receive failed: No data /

Hi,
I also have this problem. I get:
Failed to fetchhttps://qgis.org/ubuntugis/dists/bionic/InRelease   The 
following signatures couldn't be verified because the public key is not 
available: NO_PUBKEY F7E06F06199EF2F2
But when I run sudo gpg --keyring 
gnupg-ring:/etc/apt/trusted.gpg.d/qgis-archive.gpg --list-signatures, I get:
gpg: WARNING: unsafe ownership on homedir '/home/ubuntu/.gnupg'
/home/ubuntu/.gnupg/pubring.kbx
---
pub   rsa4096 2020-08-08 [SCEA] [expires: 2021-08-08]
       39877635093F2656019711FAF7E06F06199EF2F2
uid           [ unknown] QGIS Archive Automatic Signing Key (2020) 
mailto:qgis-develo...@lists.osgeo.org>>
sig 3        F7E06F06199EF2F2 2020-08-08  QGIS Archive Automatic Signing Key (2020) 
mailto:qgis-develo...@lists.osgeo.org>>
sig          73F1A14C5E444875 2020-08-08  [User ID not found]

/etc/apt/trusted.gpg.d/qgis-archive.gpg
---
pub   rsa4096 2020-08-08 [SCEA] [expires: 2021-08-08]
       39877635093F2656019711FAF7E06F06199EF2F2
uid           [ unknown] QGIS Archive Automatic Signing Key (2020) 
mailto:qgis-develo...@lists.osgeo.org>>
sig 3        F7E06F06199EF2F2 2020-08-08  QGIS Archive Automatic Signing Key (2020) 
mailto:qgis-develo...@lists.osgeo.org>>
sig          73F1A14C5E444875 2020-08-08  [User ID not found]
So the key is there, but not being verified for some reason.
Stephen

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Re: [Qgis-user] QGIS flatpak linux error QGIS starting in non-interactive mode not supported

[Patrick Dunford]

I would suggest you log that on the Flatpak Qgis issues site as well if 
possible.


On 24/07/20 4:25 am, Todd Pfaff wrote:
Thanks to Richard Duivenvoorde  for finding me 
this solution, as discussed in "Subject: Re: [Qgis-user] How to 
install QGIS in Debian 11?" on "Date: Thu, 23 Jul 2020 17:38:55 +0200".



#!/bin/sh
#
# see here for information about running QGIS, or any flatpak app,
# via an ssh connection with display to ssh-forwarded X DISPLAY
#
#   https://github.com/flatpak/flatpak/issues/397
#
flatpak run \
  --share=network \
  --command=bash \
  org.qgis.qgis \
  -c "DISPLAY=$DISPLAY qgis $*"

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Re: [Qgis-user] Madeira

[Patrick Dunford]

I assume Windows? Everything in the Windows folder at 3.4 is likely to 
be stable since the current stable is 3.14


If Linux you could try your distro's own repos, or installing an older 
OS such as Debian 9 would give you 3.4 from the Qgis repos.


On 24/07/20 4:01 am, ent-ar...@gmx.de wrote:

Hi,

I have never been there (on Madeira), but I need this version.

Here http://download.osgeo.org/qgis/ I can find a lot of 3.4. how
can I recognise a stable version there?

Thanks in advance!

Stefanie

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Re: [Qgis-user] How to install QGIS in Debian 11?

[Patrick Dunford]

I would think Flatpak themselves are more likely to have documentation 
about limitations. You might also try the Qgis flatpak project on Github 
for assistance.


On 24/07/20 1:26 am, Todd Pfaff wrote:

On Wed, 22 Jul 2020, Richard Duivenvoorde wrote:


- learn about 'flatpak' and use that to run 3.14
  (https://qgis.org/en/site/forusers/alldownloads.html#flatpak). Though
  flatpak has some limitations as it runs in a sandbox...



Are those limitations and how they impact the capabilities of QGIS 
documented anywhere?  I don't see anything about limitations here:


  https://www.qgis.org/en/site/forusers/alldownloads.html#flatpak

nor here:

  https://flathub.org/apps/details/org.qgis.qgis


I believe I've run into a big limitation.  I've installed flatpak QGIS 
on a CentOS 7 linux system.  When I try to run it I get this error:


  $ flatpak run org.qgis.qgis
  QGIS starting in non-interactive mode not supported.
  You are seeing this message most likely because you have no DISPLAY
  environment variable set.

Any ideas about what limitation is causing that error?

Thanks!
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Re: [Qgis-user] How to install QGIS in Debian 11?

[Patrick Dunford]

I gather you are not very experienced with Linux? It would be somewhat 
advisable to consider if running a testing edition is going to be 
productive for you.


If I was running testing edition it would be on a virtual machine, not 
actual hardware. Testing editions of distros can break at any time and 
often do. What is the advantage you get from Debian 11 over Debian 10, 
or perhaps the latest release of Ubuntu on a virtual machine (Ubuntu can 
be more up to date than Debian but is also part of the official build 
support as you can see)


On 22/07/20 7:42 pm, aborruso wrote:

Hi Patrick,
thank you for all the details.

My goal is to use QGIS in my debian 11 bullseye, as "user". I do not have
the skill to debug complex (for me) installation processes.
My real goal is to use the standalone console tool for running processing
algorithms [1] , in a server machine of mine.

My starting points were:

- https://qgis.org/debian/pool/main/q/qgis/
- https://qgis.org/debian/dists/

There I do not find bullseye.

Then I have a very first stupid question: is it possible to install QGIS in
debian 11, in the "official" (not advanced) way [2].
If I understand correctly, it is not possible.

The second question is: is there some step by step guide for dummies, to try
to install QGIS 3.14.x (the one with inside the new standalone console tool)
in debian 11?
Probably no.

And probably the general reply to my question is: "for a basic linux user as
you, you must wait, there is no way to do it".

Best regards

[1] https://github.com/qgis/QGIS/pull/34617
[2] https://www.qgis.org/en/site/forusers/alldownloads.html#debian-ubuntu



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Re: [Qgis-user] How to install QGIS in Debian 11?

[Patrick Dunford]

Replying to both comments so far in this conversation.

All package managers to install the Qgis packages are dependent on the 
dependencies of these packages being available from their respective 
repositories. With an unstable distro this is more difficult as the 
packages in the distro repositories are constantly being updated and may 
not match the required ones at any particular point in time. As the 
message from the package manager says very clearly *"if you are using 
the unstable distribution that some required packages have not yet been 
created or been moved out of Incoming."*


Debian development editions are changing a lot more rapidly than the 
production editions which are noted for their stability so this is 
simply a fact of life using unstable or testing editions of Debian. 
There is always a risk with the unstable versions both of the distro and 
software that an update may break either and you may have to wait a few 
days until whichever unmet dependency is resolved but this may not 
actually happen until shortly after the next point release of Qgis 3.14 
is produced.


If you wanted to debug this further you could look at the lists of 
dependencies that are at this URL 
http://qgis.org/debian/dists/unstable/main/binary-amd64/Packages and 
then one possibility is to check all the dependencies of each package in 
turn. This is no doubt highly laborious considering the number of 
dependencies listed for the example libqgis-3d3.14.0 the first one in 
the list, and for all the others.


Using the nightly tree which is built more often therefore potentially 
more up to date is probably a better long term strategy. For example the 
current packages list at 
http://qgis.org/debian-nightly/dists/unstable/main/binary-amd64/Packages 
tells me there are later versions of some of the packages listed below 
present and they may be more likely to be up to date with the 
dependencies that are present in your computer.


There is one question I am unsure of however and that is whether 
unstable is for Ubuntu distros, and Debian users should be using the sid 
branch instead, or whether they are actually the same. sid is only 
available in debian-nightly tree however.


On 17/07/20 10:53 pm, aborruso wrote:

Hi,
I'm not able to install QGIS in Debian 11.

My steps

sudo add-apt-repository "deb https://qgis.org/debian unstable main"
sudo apt-get update
sudo apt-get install qgis

I have these errors:

Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
  qgis : Depends: libqgis-3d3.14.0 but it is not going to be installed
 Depends: libqgis-analysis3.14.0 but it is not going to be installed
 Depends: libqgis-app3.14.0 but it is not going to be installed
 Depends: libqgis-core3.14.0 but it is not going to be installed
 Depends: libqgis-gui3.14.0 but it is not going to be installed
 Depends: libqt5core5a (>= 5.12.2) but 5.11.3+dfsg1-4 is to be
installed
 Depends: libqt5webkit5 (>= 5.212.0~alpha3) but it is not going to be
installed
 Depends: python3-qgis (= 1:3.14.0+99unstable-1) but it is not going
to be installed
 Depends: qgis-providers (= 1:3.14.0+99unstable-1) but it is not
going to be installed
 Recommends: qgis-plugin-grass but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

How to solve these?

Thank you



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[Qgis-user] 3.10.7 fails to start after upgrade from 3.10.6

[Patrick Dunford]

Good day

After upgrading from 3.10.6 to 3.10.7 on Debian 10, Qgis crashes 
immediately at startup.


I attempted removing the user profile from the previous installation of 
Qgis, but the software still crashes after getting through the Getting 
Started dialog.


This problem has occurred on two of my computers that are both running 
Debian 10, after upgrading from 3.10.6 to 3.10.7, recently.


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