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/
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Department/
e: jaroslaw.sadow...@cpk.pl
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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_source=sendgrid_medium=email=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_source=sendgrid_medium=email=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=05%7C01%7Cmichael.dodd%40open.ac.uk%7Ce252ba17960e47d4459b08daa14af7f3%7C0e2ed45596af4100bed3a8e5fd981685%7C0%7C0%7C637999640602880359%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C=0kauz1XTDogmzS2bswO60uWR2EgvdVNCSOPzTKC3pjo%3D=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
> ___
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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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