[Qgis-user] Virtual Layer query with "currentExtent" not working anymore

[Bernd Vogelgesang]

Hi folks,

A while ago, I figured out how to limit a query on a layer by the
current map extent as a preparation for another query:

SELECT * FROM ASK_Geometrien WHERE
st_intersects(ASK_Geometrien.geometry, currentExtent());

Now, when I try it again later, the test fails with "no such function:
currentExtent"

Has something changed or are there other means to achieve the same goal?

QGIS 3.22.3-Białowieża

Cheers,

Bernd




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Re: [Qgis-user] Virtual Layer query with "currentExtent" not working anymore

[Халилов Артур Фирдусович]

Good afternoon,
how do I unsubscribe from the mailing list?

Sincerely,
Khalilov Artur

From: Qgis-user  On Behalf Of Andrea 
Giudiceandrea
Sent: Wednesday, January 19, 2022 3:00 PM
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Virtual Layer query with "currentExtent" not working 
anymore


Bernd 
Vogelgesang<https://www.mail-archive.com/search?l=qgis-user@lists.osgeo.org&q=from:%22Bernd+Vogelgesang%22>
 Wed, 19 Jan 2022 03:34:05 
-0800<https://www.mail-archive.com/search?l=qgis-user@lists.osgeo.org&q=date:20220119>

A while ago, I figured out how to limit a query on a layer by the

current map extent as a preparation for another query:

SELECT * FROM ASK_Geometrien WHERE

st_intersects(ASK_Geometrien.geometry, currentExtent());



Now, when I try it again later, the test fails with "no such function:

currentExtent"

Hi Bernd,
AFAIK there is no currentExtent() inbuilt function.

You need to define a custom currentExtent() function that returns the current 
extent.

Please see, for example: 
https://gis.stackexchange.com/questions/303325/how-to-speed-up-a-query-in-a-virtual-layer-of-qgis

Best regards.

Andrea Giudiceandrea
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Re: [Qgis-user] Issue with libQt5Core when running QGI 3.22 via singularity

[Shan-ho Tsai]

Hi Jürgen,

Thank you so much for your response, that worked!

Now I am seeing a new (non-fatal) error:

"Couldn't load plugin 'MetaSearch' due to an error when calling its 
classFactory() method

ModuleNotFoundError: No module named 'owsllib.ogcapi.records'  "

Is this a module that is missing in the docker container or perhaps singularity 
is somehow not finding it?

Any thoughts how I can resolve this issue? (I am interested in running QGIS 
without a server or web services, if it matters).

I really appreciate your kind help.

Regards,
Shan-Ho



Shan-Ho Tsai
GACRC/EITS, University of Georgia, Athens GA




From: Qgis-user  on behalf of Jürgen E. 
Fischer 
Sent: Tuesday, January 18, 2022 3:29 PM
To: qgis-user@lists.osgeo.org 
Subject: Re: [Qgis-user] Issue with libQt5Core when running QGI 3.22 via 
singularity

[EXTERNAL SENDER - PROCEED CAUTIOUSLY]


Hi Shan-ho,

On Tue, 18. Jan 2022 at 18:18:31 +, Shan-ho Tsai wrote:
> I'm trying to run QGIS 3.22 on an HPC cluster. Docker is not available on the 
> cluster, but Singularity is. I created a singularity image from the official 
> docker container documented at https://hub.docker.com/r/qgis/qgis. The 
> command I used to create the singularity image is

> singularity pull docker://qgis/qgis

> and this created qgis_latest.sif

> But when I run it via Singularity, I get the error that libQt5Core.so cannot 
> be found:

> [shtsai@b1-24 ~]$ singularity run qgis_latest.sif qgis --help
> /usr/bin/qgis: error while loading shared libraries: libQt5Core.so.5: cannot 
> open shared object file: No such file or directory

Run

strip --remove-section=.note.ABI-tag /usr/lib/x86_64-linux-gnu/libQt5Core.so.5


Jürgen

--
Jürgen E. Fischer   norBIT GmbH Tel. +49-4931-918175-31
Dipl.-Inf. (FH) Rheinstraße 13  Fax. +49-4931-918175-50
Software Engineer   D-26506 Nordenhttps://www.norbit.de
QGIS release manager (PSC)  Germany IRC: jef on Libera|OFTC
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Re: [Qgis-user] [QGIS-user] Convert r.report output from txt to csv/xls

[Nicolas Cadieux]

Hi,

I am not in front of my computer so it’s difficult for me to test the r.report 
functions.  I see they have various flags 

-h
Suppress page headers
-f
Use formfeeds between pages
-e
Scientific format

I see you can suppress some information like the header and probably some 
information at the bottom of the page.  What is -e???  Could that be a easier 
csv output?

Are you using r.report for cross tabulation?  You may be able to get a less 
messy output with another QGIS algorithm.  What specific information do you 
need? Gdal info using the -stats flag probably has the same info you are 
looking for.  Make sure you do not use approximate statistics.   QGIS also has 
zonal statistics algorithms.  That would probably easier than adding a new 
python function in the model (but yes, I could be done).

Nicolas Cadieux
https://gitlab.com/njacadieux


> Le 18 janv. 2022 à 21:10, Igor Oliveira Ribeiro  
> a écrit :
> 
> 
> Hi Nicolas,
> thanks for your help. So, I don't know how to use python in QGIS. I know R 
> and Matlab programming, but not about python. Please, see attached my model 
> in QGIS. I would like to insert after each r.report box a conversion of the 
> output file from txt to csv. Do you think it's possible?
> 
>> On Tue, Jan 18, 2022 at 10:05 PM Nicolas Cadieux 
>>  wrote:
>> Hi,
>> 
>> Probably but this would be a Grass request.  
>> 
>> Nicolas Cadieux
>> https://gitlab.com/njacadieux
>> 
 Le 18 janv. 2022 à 20:14, Ari Meyer  a écrit :
 
>>> 
>>> Just a question, given the discussion here.  Shouldn't such a report be 
>>> generated in a structured format like YAML/JSON/XML for easier parsing?  
>>> Would this merit an enhancement request?
>>> Ari
>>> 
 On Tue, Jan 18, 2022 at 6:54 PM chris hermansen  
 wrote:
 Nicolás, Igor and list,
 
> On Tue, Jan 18, 2022, 16:40 Nicolas Cadieux  
> wrote:
> Hi,
> The r.report is a rather complicated text file that contains a lot of 
> characters made for improving the look of the output.  On way could be to 
> python your way thought it so that is can find your way to the proper 
> information.  This would save time if you have lots of files. 
 
 
 Or if you have to process the same file many times because your data is 
 evolving.
> 
> The faster way, if you don’t program is to use a mixture of notepad++ 
> along with excel or open office.  You can easily remove all useless 
> characters like and replace them by no string or with a “,”.  Then you 
> can import in open office.  I like OpenOffice Calc for this because you 
> can they is to merge multiple separation characters into one.  This could 
> help with the imports.  For example, if you have “line 
> 1…….data,data,data”, you could use both the dot and the comma as 
> separators and the multiple dots would be merged as one unique separator. 
>  
 
 
 Or not... If your decimal points are dots.
> 
> If you have multiple files, you could use concatenation to make one big 
> .csv file.  For windows, use the example could here. 
> https://superuser.com/questions/111825/a-command-line-or-batch-cmd-to-concatenate-multiple-files
> 
> Hope this helps.  This by the way is an excellent way to start learning 
> Python programming.  Python has easy of way to read and write.txt file 
> and multiple way to manipulate text strings.  Great project if you have 
> the time to learn.
 
 
 I have to transform data files like this quite often.
 
 Generally whether using Python or another programming language, you want 
 to use regular expressions to match and transform text patterns. The 
 learning curve can be a bit steep but very worthwhile.
 
 On Unix / Linux there is a specialized language for this type of transform 
 called awk. It's probably available for Windows somewhere. The advantage 
 of awk is there is no programming overhead for reading and writing lines; 
 the awk programs are statements reacting to the input received from the 
 file.
> 
> Nicolas Cadieux
> https://gitlab.com/njacadieux
> 
>>> Le 18 janv. 2022 à 19:18, Igor Oliveira Ribeiro 
>>>  a écrit :
>>> 
>> 
>> Hi, 
>> I have been using qgis version 3.10 and 3.16. I've been using the 
>> r.report tool to extract some data from a raster. Currently, the report 
>> is generated from r.report in *.txt format. I would like to know if it 
>> is possible to convert this format to csv/xls, within QGIS?
>> 
>> -- 
>> 
>> See our last paper: 
>> Impact of biomass burning on a metropolitan area in the Amazon during 
>> the 2015 El Niño: The enhancement of carbon monoxide and levoglucosan 
>> concentrations.
>> 
>> Igor Oliveira Ribeiro
>> Post-Doc on Regional Climate Change, Vulnerability, Impacts and 
>> Adaptation - Cuomo Foundation/UEA
>> 
>> +55 9

Re: [Qgis-user] Virtual Layer query with "currentExtent" not working anymore

[Nicolas Cadieux]

Hi,

Look at the unsubscribe link at the bottom of the email.  Next time, I 
recommend you start a new question rather than jump on a old unrelated topic.
Cheers!

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 19 janv. 2022 à 07:11, Халилов Артур Фирдусович  
> a écrit :
> 
> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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[Qgis-user] QGIS and stereo image viewing / digitizing

[chris hermansen]

I've looked online for an answer to this question but haven't found
anything obvious.

Does anyone on this list work with stereo image viewing in conjunction with
QGIS in order to digitize the usual points, lines or polygons?  For
example, land cover?  Measuring heights of objects?

There seem to be lots of tools to do DEM extraction and ortho image
rectification but that's not where I'm going.

Thanks in advance for any pointers.

-- 
Chris Hermansen · clhermansen "at" gmail "dot" com

C'est ma façon de parler.
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Re: [Qgis-user] QGIS and stereo image viewing / digitizing

[Nicolas Cadieux]

Hi,

I am currently trying out OpenDroneMap for the creation of Orthophotos.  
This is challenging as I am using 1950's aerial photos.  If you find 
anything for viewing in 3D, please keep me posted.


Nicolas

On 2022-01-19 11:44 a.m., chris hermansen wrote:
I've looked online for an answer to this question but haven't found 
anything obvious.


Does anyone on this list work with stereo image viewing in conjunction 
with QGIS in order to digitize the usual points, lines or polygons?  
For example, land cover?  Measuring heights of objects?


There seem to be lots of tools to do DEM extraction and ortho image 
rectification but that's not where I'm going.


Thanks in advance for any pointers.

--
Chris Hermansen · clhermansen "at" gmail "dot" com

C'est ma façon de parler.

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--
Nicolas Cadieux
https://gitlab.com/njacadieux
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Re: [Qgis-user] QGIS and stereo image viewing / digitizing

[chris hermansen]

Nicolás and list,

On Wed, Jan 19, 2022 at 9:07 AM Nicolas Cadieux 
wrote:

> Hi,
>
> I am currently trying out OpenDroneMap for the creation of Orthophotos.
> This is challenging as I am using 1950's aerial photos.  If you find
> anything for viewing in 3D, please keep me posted.
>

I don't know if you have looked at MicMac but it could be of use to you.  I
might investigate it further for what I want to do as well since it seems
like a possibility (basically 3D feature tracing for land use cartography).

https://micmac.ensg.eu/index.php/Presentation

Not sure of any possible QGIS integration

> Nicolas
> On 2022-01-19 11:44 a.m., chris hermansen wrote:
>
> I've looked online for an answer to this question but haven't found
> anything obvious.
>
> Does anyone on this list work with stereo image viewing in conjunction
> with QGIS in order to digitize the usual points, lines or polygons?  For
> example, land cover?  Measuring heights of objects?
>
> There seem to be lots of tools to do DEM extraction and ortho image
> rectification but that's not where I'm going.
>
> Thanks in advance for any pointers.
>
> --
> Chris Hermansen · clhermansen "at" gmail "dot" com
>
> C'est ma façon de parler.
>
> ___
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>
> --
> Nicolas Cadieuxhttps://gitlab.com/njacadieux
>
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-- 
Chris Hermansen · clhermansen "at" gmail "dot" com

C'est ma façon de parler.
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Re: [Qgis-user] QGIS and stereo image viewing / digitizing

[Nicolas Cadieux]

Hi,

MicMac was on my list along with Orfeo Toolbox, Pix4D and Envi. Trying 
out the OpenSource platforms first.  I now have AnaBuilder in list.  
(Thanks Kirk).


Nicolas

On 2022-01-19 12:22 p.m., chris hermansen wrote:

Nicolás and list,

On Wed, Jan 19, 2022 at 9:07 AM Nicolas Cadieux 
 wrote:


Hi,

I am currently trying out OpenDroneMap for the creation of
Orthophotos.  This is challenging as I am using 1950's aerial
photos.  If you find anything for viewing in 3D, please keep me
posted.


I don't know if you have looked at MicMac but it could be of use to 
you.  I might investigate it further for what I want to do as well 
since it seems like a possibility (basically 3D feature tracing for 
land use cartography).


https://micmac.ensg.eu/index.php/Presentation

Not sure of any possible QGIS integration

Nicolas

On 2022-01-19 11:44 a.m., chris hermansen wrote:

I've looked online for an answer to this question but haven't
found anything obvious.

Does anyone on this list work with stereo image viewing in
conjunction with QGIS in order to digitize the usual points,
lines or polygons?  For example, land cover?  Measuring heights
of objects?

There seem to be lots of tools to do DEM extraction and ortho
image rectification but that's not where I'm going.

Thanks in advance for any pointers.

-- 
Chris Hermansen · clhermansen "at" gmail "dot" com


C'est ma façon de parler.

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-- 
Nicolas Cadieux

https://gitlab.com/njacadieux

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--
Chris Hermansen · clhermansen "at" gmail "dot" com

C'est ma façon de parler.


--
Nicolas Cadieux
https://gitlab.com/njacadieux
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[Qgis-user] Yoel Flores

[yoel flores]

For someone on this list who has dedicated himself to counting trees from
RGB drone images with qgis.
After adjusting the resolution of an RGB image, binarizing with NDVI,
applying a conditional and vectorizing, what can be done for automated
counting? Because in most cases it is not explained further or there are no
true results.
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[Qgis-user] QGIS 3.22 breaks CRS Transform Files?

[John Layt]

Hi,

We're preparing to upgrade the company from 3.16 LTR to 3.22 LTR and in our
testing we're hitting issues apparently due to the Mac packages changing
from PROJ 6 to PROJ 8 which seems to have changed the transform file names
and formats. I've not seen any warnings or documentation on these breaking
changes and how to deal with them so was hoping the list could offer some
enlightenment.

Most of our work is in OSGB36, but with an occasional sprinkling of WGS84,
or at least projects created in WGS84 by default with OSGB36 data then
added. Where required we use the OSTN15 transform. Some of these project
files stretch back to QGIS2 days so may be quite crufty.

The preferred OSTN15 transform shipped with 3.16 and earlier versions was
OSTN15_NTv2_OSGBtoETRS.gsb. In 3.22 this appears to have changed name and
format to uk_os_OSTN15_NTv2_OSGBtoETRS.tif.

We're seeing 2 issues in 3.22 we don't have in 3.16.

1) When opening projects with the OSTN15 transform in them, we get a
warning dialog that the grid file OSTN15_NTv2_OSGBtoETRS.gsb can't be found
and must be manually installed. The dialog tries to be helpful by including
a download link, but it's to the uk_os_OSTN15_NTv2_OSGBtoETRS.tif file
instead, so you need to manually source the gsb file. The ideal solution
would be for QGIS to automatically convert to using the tif as it seems to
already know they are equivalent, or to ask the user for confirmation to
do so.

2) If you create a new Project and it defaults to WGS84, and then you
change the CRS to OSGB36, you get the "Ballpark Transform" warning even
though there is no data to be transformed, and may never be. Also, the
warning gets displayed as an inline alert on the canvas as soon as you
select the new CRS, so if you don't Apply and close the Properties you
still see the warning. This may be a regression of
https://github.com/qgis/QGIS/issues/34983, but the message probably
shouldn't be displayed in these circumstances.

In general, the "Ballpark transform" message leaves users a little
stranded. Our less-experienced users usually end up with it as they
panicked and hit Cancel on the Transform select dialog when opening an
existing project. Perhaps the warning could actually link back to the
Transform Select dialog again? Or at least list the affected layers?

As it stands, it appears I will need to somehow install the gsb file in
every user profile and set the new tif as the default for all new projects.
Any words of advice on how best to achieve this, or other solutions?

We do need to better educate our users on CRS and transforms (and using
better default settings!), but it's hard when many are only occasional
users. Heck, I struggle myself! Does anyone know of some clear and simple
explanations of CRS transforms we can use?

Cheers!

John.
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[Qgis-user] Lagging qgis

[Alexandru Munteanu]

Hi all,

I'm having a really hard time editing shapes in qgis, any kind of shapes
(lines, polygons, dots). And doesn't matter the size of the shape file, I
can have few points or lines in the layer.
The lagging varies from drawing something new, or moving vertices around.
Even changing styles is difficult.
For example, I want to change the color of a line, or its width, so i
select it's style, double click, wait a while for it to open, select the
width, wait for to get selected, then wait a little for it to apply and so
on.

What can be the problem? Anyone encountered something similar?

I work in version 3.12, which runs on a Lenovo Thinkpad, intel i7, 16 GB
ram, win 11.

Thank you in advance for any tips,
Alexandru
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Re: [Qgis-user] Lagging qgis

[Richard Duivenvoorde]

On 1/19/22 20:38, Alexandru Munteanu wrote:

Hi all,

I'm having a really hard time editing shapes in qgis, any kind of shapes 
(lines, polygons, dots). And doesn't matter the size of the shape file, I can 
have few points or lines in the layer.
The lagging varies from drawing something new, or moving vertices around. Even 
changing styles is difficult.
For example, I want to change the color of a line, or its width, so i select 
it's style, double click, wait a while for it to open, select the width, wait 
for to get selected, then wait a little for it to apply and so on.

What can be the problem? Anyone encountered something similar?


Sometimes plugins are the culprit.

Can you try to create a profile without any plugins in it and then see if it it 
still slow?

If there is no problem anymore without plugins, you have to find the one that 
is creating the issue by enabling your old plugins one by one.

HTH,

Regards,

Richard Duivenvoorde

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Re: [Qgis-user] Lagging qgis

[Alexandre Neto]

Also, try a simple project with only the layer you are editing. If you have
too many layers and snapping enabled on all labels... It can be slow.

Alexandre Neto
User support
www.qcooperative.net

A quarta, 19/01/2022, 19:50, Richard Duivenvoorde 
escreveu:

> On 1/19/22 20:38, Alexandru Munteanu wrote:
> > Hi all,
> >
> > I'm having a really hard time editing shapes in qgis, any kind of shapes
> (lines, polygons, dots). And doesn't matter the size of the shape file, I
> can have few points or lines in the layer.
> > The lagging varies from drawing something new, or moving vertices
> around. Even changing styles is difficult.
> > For example, I want to change the color of a line, or its width, so i
> select it's style, double click, wait a while for it to open, select the
> width, wait for to get selected, then wait a little for it to apply and so
> on.
> >
> > What can be the problem? Anyone encountered something similar?
>
> Sometimes plugins are the culprit.
>
> Can you try to create a profile without any plugins in it and then see if
> it it still slow?
>
> If there is no problem anymore without plugins, you have to find the one
> that is creating the issue by enabling your old plugins one by one.
>
> HTH,
>
> Regards,
>
> Richard Duivenvoorde
>
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[Qgis-user] LTR cycle

[Ari Meyer]

>From looking at
https://qgis.org/en/site/getinvolved/development/roadmap.html#location-of-prereleases-nightly-builds
, am I interpreting this correctly to mean that 3.22.4 will become the next
LTR next month?  If so, what happens to 3.16 LTR at that point?

Thanks,
Ari
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Re: [Qgis-user] QGIS and stereo image viewing / digitizing

[Roland Spielhofer]

Hi,

maybe AliceVision (https://alicevision.org/) could be of use for you.

I still have not tried it myself, it's on my To Do-List.

 

Regards,

Roland

 
 

Gesendet: Mittwoch, 19. Januar 2022 um 19:01 Uhr
Von: "Nicolas Cadieux" 
An: "chris hermansen" 
Cc: "qgis-user" 
Betreff: Re: [Qgis-user] QGIS and stereo image viewing / digitizing


Hi,

MicMac was on my list along with Orfeo Toolbox, Pix4D and Envi.  Trying out the OpenSource platforms first.  I now have AnaBuilder in list.  (Thanks Kirk).

Nicolas

On 2022-01-19 12:22 p.m., chris hermansen wrote:



Nicolás and list,
 


On Wed, Jan 19, 2022 at 9:07 AM Nicolas Cadieux  wrote:



Hi,

I am currently trying out OpenDroneMap for the creation of Orthophotos.  This is challenging as I am using 1950's aerial photos.  If you find anything for viewing in 3D, please keep me posted.



 

I don't know if you have looked at MicMac but it could be of use to you.  I might investigate it further for what I want to do as well since it seems like a possibility (basically 3D feature tracing for land use cartography).

 

https://micmac.ensg.eu/index.php/Presentation

 

Not sure of any possible QGIS integration



Nicolas

On 2022-01-19 11:44 a.m., chris hermansen wrote:



I've looked online for an answer to this question but haven't found anything obvious.

 

Does anyone on this list work with stereo image viewing in conjunction with QGIS in order to digitize the usual points, lines or polygons?  For example, land cover?  Measuring heights of objects?

 

There seem to be lots of tools to do DEM extraction and ortho image rectification but that's not where I'm going.

 

Thanks in advance for any pointers.


--

Chris Hermansen · clhermansen "at" gmail "dot" com

C'est ma façon de parler.



 

 

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--
Nicolas Cadieux
https://gitlab.com/njacadieux

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--

Chris Hermansen · clhermansen "at" gmail "dot" com

C'est ma façon de parler.




--
Nicolas Cadieux
https://gitlab.com/njacadieux
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Re: [Qgis-user] LTR cycle

[Ari Meyer]

Thanks for confirming that, Andrea.  So 3.22.4 will indeed be marked as the
current LTR starting next month?  I ask because we plan to begin user
acceptance testing with our QGIS plugin in March, and would like to deploy
on the latest stable LTR.  We were initially targeting 3.16.15, but perhaps
the 3.22 LTR is worth considering at this point.

Another question: where do we find the release notes for builds like
3.16.16?  I only see
https://www.qgis.org/en/site/forusers/visualchangelogs.html which doesn't
show changes between point releases.  I also didn't see any release notes
in https://qgis.org/downloads/ .

Best,
Ari

On Thu, Jan 20, 2022 at 12:50 AM Andrea Giudiceandrea 
wrote:

> Ari Meyer
> <https://www.mail-archive.com/search?l=qgis-user@lists.osgeo.org&q=from:%22Ari+Meyer%22>
>  Wed, 19 Jan 2022 19:24:14 -0800
> <https://www.mail-archive.com/search?l=qgis-user@lists.osgeo.org&q=date:20220119>
>
> If so, what happens to 3.16 LTR at that point?
>
> Thanks,
> Ari
>
>
> Hi Ari,
> it will happen nothing special, but the same happened for the previous
> QGIS LTR versions 3.10, 3.4, 2.18,  The last QGIS 3.16 LTR version is
> the currently available 3.16.16 version. There will be no further versions
> in the 3.16.x series. This means that it will no longer possible to fix any
> bugs in the 3.16 branch and release a new 3.16.x (x>16) version with the
> bugs fixed (unless something exceptional happens in the meantime).
>
> Best regards.
>
> Andrea Giudiceandrea
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Re: [Qgis-user] LTR cycle

[Richard Duivenvoorde]

On 1/20/22 08:53, Ari Meyer wrote:

Another question: where do we find the release notes for builds like 3.16.16?  I only see 
https://www.qgis.org/en/site/forusers/visualchangelogs.html 
 which doesn't show 
changes between point releases.  I also didn't see any release notes in 
https://qgis.org/downloads/  .


Generated from gitlog and in the 3.16 branch on github: ?

https://github.com/qgis/QGIS/blob/release-3_16/ChangeLog

To be able to read in the browser:

https://raw.githubusercontent.com/qgis/QGIS/release-3_16/ChangeLog

Regards,

Richard Duivenvoorde

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