Re: [Qgis-user] Import German population data

[Bernd Vogelgesang via QGIS-User]

Hi,

I just copied you example lines to a text file, drag-dropped it into 
QGIS, used “Create points layer from table”, set the coordinate system 
to 3035, X,Y according to your settings, and got two points in Flensburg.


Am 06.07.24 um 14:23 schrieb Jonathan Berschauer via QGIS-User:

Hi everyone!

I want to import German population data ( 
https://www.statistikportal.de/de/veroeffentlichungen/georeferenzierte-bevoelkerungszahlen ) into QGIS.

The data is in ETRS89/LAEA / EPSG-3035 format.
I modified the CSV, so it looks like this:

==
Gitter_ID_1km;Zeitraum;Einwohner;X;Y
CRS3035RES1000mN3516000E4281000;2021;1403;4281000;3516000
CRS3035RES1000mN3516000E4282000;2021;1804;4282000;3516000
==

But when I import it as a layer, no data is shown...

Can anyone help?

Thank you very much!
Jonathan

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--
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Tel: 09192-3499427
mobil: 0163-1860160
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Re: [Qgis-user] clip raster by layer mask

[Bernd Vogelgesang via QGIS-User]

Did you e.g. try to copy the selected region to a memory layer and 
perform the clip with that? Maybe the outcome gives some clues …



Cheers,

Bernd
Am 30.05.24 um 20:33 schrieb Sibylle Stöckli via QGIS-User:

Dear community

I am using the QGIS tool "clip raster by layer mask".

Here the process

1. open attribute table of layer maks

2. select one "region"

3. select the raster layer layer of that "region"

4. raster - extraction-clip raster layer maks

Question: when checking the result, the assignment of the "region" is 
wrong. The clipped "region" is not that one that was selected in step 2.


Is there anything else that may hamper the compatibility of both layers? 
Both layers are EPSG:2056 (see figures). IS the Foat32 data type a problem?


Raster layer:

Layer mask “regions”

Kind regards

Sibylle


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Re: [Qgis-user] How to connect qfield to GPS RTK

[Bernd Vogelgesang via QGIS-User]

Hi,

I am not very experienced in this field either, but get my RTK running 
most of the time. I use a RTK GNNS from Ardusimple, connected to the 
Android device by bluetooth. What kind of RTK  do you try use?


I use 
https://play.google.com/store/apps/details?id=com.lefebure.ntripclient=en_US=1 
as the ntrip client app to handle the ntrip caster connection.


In Android, you have to enable the mock location in the developer 
settings and set the lefebure ntrip caster as source for the positioning 
data to bypass your internal GPS.


When everything is correctly configured in the ntrip client app, QField 
picks up the RTK positioning automatically.


This is what works for me but I have no further knowledge about other 
types of devices and connection possibilities so far.


Cheers,
Bernd
Am 17.04.24 um 18:30 schrieb david cebrian via QGIS-User:

Hello everyone,

I have read the qfield documentation but I still don't know how to 
connect my RTK to qfield in order to do a topographic survey. I am using 
android and the latest version of qfield.


 1.
Someone knows how to connect to ntrip caster? And 2) do I need
another app on my phone in order to do so? Any other relevant
information is most welcome.


Many thanks for the attention to this matter.

Best wishes,

David

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Re: [Qgis-user] Cross layer filtering

[Bernd Vogelgesang via QGIS-User]

Hi,

idea #1: Do not create a virtual layer (tried this way for years and its 
still somehow a nightmare), but just duplicate you layer and switch it 
to rule based rendering with a CASE WHEN clause for the selected property.


idea #2: I do not know what you exactly mean with "bring in an 
associated layer" and how much of it you have to bring in, but maybe 
aggregate functions in other virtual fields will do the job?


I just recently dived into the aggregate stuff, and there are not too 
many good examples around. I find it pretty stable and did not encounter 
any crashes like with virtual layers (it just works or not). Might take 
a while for calculations (but that is just a question of hardware 
upgrades ;) )
When this is just for layout purposes in the composer, rendering time 
should not be as significant as well.


#3: Use themes!

When running into troubles, just ping me.

Cheers,
Bernd

p.s. maybe just bad ideas, but this just popped into my mind after my 
third beer


Am 28.03.24 um 14:39 schrieb Paul Wittle via QGIS-User:

Hi,

I’ve been filtering a layer by adding a virtual column populated with 
is_selected() and then creating a virtual layer from it using the filter:


WHERE virtualField = 1

This is working well and allows you to have a copy of the layer that 
only shows the selected records when you are creating a layout.


I now need to bring in an associated layer, but I can’t find a reliable 
way to cross layer filter because QGIS just hangs for ages and crashes.


I’ve searched around and can see a lot of people talk about making the 
database do the work but of course it can’t if you are trying to use a 
selection filter.


What is the most reliable way of setting up a filter based on a join 
because QGIS tells me that I must use a virtual layer and even creates 
it for me; but then it just hangs and crashes.


Is there a better way?

Info required to replicate:

  * Create a layer (mine is from Oracle DB) and add a virtual field
called “SelectedRow” with the formula “to_int(is_selected())”
  * Bring in a second layer that has a one-to-many relationship based on
an attribute
  * I’m trying to filter the second layer based on the first one where
the second layer must only include rows that match a selected key. 


Thank in advance for any tips,

Paul

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mobil: 0163-1860160
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Re: [Qgis-user] QGIS through conda on Linux

[Bernd Vogelgesang via QGIS-User]

Hi Hannes,

ocl-icd-system  indeed did the trick :)

Will now investigate the other traps that my lie around.

See you then ;)

Bernd
Am 26.02.24 um 17:21 schrieb Johannes Kröger (WhereGroup):
I haven't tested OpenCL in a conda QGIS myself but assumed that the 
instructions would work (have working OpenCL on the host, then install 
the ocl-icd-system in the conda environment where you want to use it).


A quick test on a AMD Ryzen laptop just failed but even non-conda QGIS 
did not pick up OpenCL support on it. :\


I hope this isn't a dead end. Sorry for not keeping your goal with 
OpenCL support in mind when suggesting this initially!


On 26.02.24 15:32, Bernd Vogelgesang wrote:

S,

I thought to share my steps so far, so I will not have to ask again in 
some weeks ;)


terminal:
$ curl -L -O 
"https://github.com/conda-forge/miniforge/releases/latest/download/Miniforge3-$(uname)-$(uname -m).sh"

bash Miniforge3-$(uname)-$(uname -m).sh

was asked to deactivate the base environment and confirmed, but 
somehow this did not happen, so:


$ conda config --set auto_activate_base false

$ conda create --name qgis_3.34

then I got warned that there is a newer version of conda (strange, why 
isn't the new version installed right away?).

So done as told:

$ conda update -n base -c conda-forge conda

$ conda activate qgis_3.34

conda install qgis=3.34

stuff is installed, but again the warning to update

finally:
WARNING: No ICDs were found. Either,
- Install a conda package providing a OpenCL implementation (pocl, 
oclgrind, intel-compute-runtime, beignet) or
- Make your system-wide implementation visible by installing 
ocl-icd-system conda package.


That stuff is exactly what I was messing around with for the past week 
to get the graphics card support in QGIS. Gnrrr...!


So, what to do now? I feel like panicking ... ;)





Am 26.02.24 um 14:21 schrieb Johannes Kröger (WhereGroup):
Don't feel dumb, it is all written and spread out in super 
complicated ways but once running, it's alright-ish.


Normal Miniforge3 should be fine unless you know you want pypy.
Unless you know differently, try the "Miniforge3-Linux-x86_64" version.
Mamba is something hidden in the background, for you it will pretend 
to be Conda. Conda is the original project, mamba is a faster, 
compatible alternative.
Miniforge is something that comes with mamba "as conda" and 
automatically uses the big "conda-forge" repository where lots of 
software and libraries are available, packaged by the community.


You can use the command lines from 
https://github.com/conda-forge/miniforge?tab=readme-ov-file#install


After installation I recommend: $ conda config --set 
auto_activate_base false
Otherwise every terminal/shell session will run using a conda 
environment instead of your standard system environment.


Once installed, you can use the "create" line from other previous 
mail to install a QGIS environment. Then "conda activate qgis_3.34" 
to activate it in a terminal session, "qgis" in that same terminal to 
launch that QGIS and just close the terminal or enter "conda 
deactivate" to deactivate it again.


Cheers, Hannes


On 26.02.24 13:41, Bernd Vogelgesang wrote:

Hi Hannes,

Thanks for you answer. I played around before with those snakes and 
that's what maybe brought me into trouble.


And again, this zoo of species starts to confuse me, starting with 
the installer:

Miniforge3 or Miniforge-pypy3 ?
And when does the mamba come into play instead of the conda?

Sorry for me playing the dumb, but I almost spent a week trying to 
get things back to normal here at my desk.


Cheers,
Bernd

Am 26.02.24 um 12:35 schrieb Johannes Kröger (WhereGroup):

Hi Bernd,

a pragmatic solution which I have grown to like is using conda 
environments. Using mamba instead of the default conda via 
https://github.com/conda-forge/miniforge to reduce annoyances and 
then it is for example a simple "conda --create qgis_3.34 
qgis=3.34" to get a nicely isolated QGIS 3.34 with pdal etc.


Just make sure to deactivate the base environment in your 
terminal/shell, otherwise you are trading one potential mess for 
another ;)


Cheers, Hannes

On 26.02.24 12:10, Bernd Vogelgesang via QGIS-User wrote:

Hi,
using QGIS on the "normal" ubuntu-based Linux Mint for years, I 
again managed to render my system unusable by playing around too 
much, resulting in ever crashing QGIS so I even had to reactivate 
a Windows Virtual Box to be able to work!!


After a hell of problems with NVIDIA graphics drivers (opencl 
support in QGIS), I finally managed to get everything to work with 
Linux Mint Debian edition ... but now had to learn that Debian 
does not provide PDAL for point cloud stuff in the repositories.


Long story short: Can anyone give me recommendations how to get 
PDAL working with QGIS that do NOT include building PDAL and QGIS 
by myself?

Though I USE Linu

Re: [Qgis-user] QGIS through conda on Linux

[Bernd Vogelgesang via QGIS-User]

S,

I thought to share my steps so far, so I will not have to ask again in 
some weeks ;)


terminal:
$ curl -L -O 
"https://github.com/conda-forge/miniforge/releases/latest/download/Miniforge3-$(uname)-$(uname 
-m).sh"

bash Miniforge3-$(uname)-$(uname -m).sh

was asked to deactivate the base environment and confirmed, but somehow 
this did not happen, so:


$ conda config --set auto_activate_base false

$ conda create --name qgis_3.34

then I got warned that there is a newer version of conda (strange, why 
isn't the new version installed right away?).

So done as told:

$ conda update -n base -c conda-forge conda

$ conda activate qgis_3.34

conda install qgis=3.34

stuff is installed, but again the warning to update

finally:
WARNING: No ICDs were found. Either, 

- Install a conda package providing a OpenCL implementation (pocl, 
oclgrind, intel-compute-runtime, beignet) or 

- Make your system-wide implementation visible by installing 
ocl-icd-system conda package.


That stuff is exactly what I was messing around with for the past week 
to get the graphics card support in QGIS. Gnrrr...!


So, what to do now? I feel like panicking ... ;)





Am 26.02.24 um 14:21 schrieb Johannes Kröger (WhereGroup):
Don't feel dumb, it is all written and spread out in super complicated 
ways but once running, it's alright-ish.


Normal Miniforge3 should be fine unless you know you want pypy.
Unless you know differently, try the "Miniforge3-Linux-x86_64" version.
Mamba is something hidden in the background, for you it will pretend to 
be Conda. Conda is the original project, mamba is a faster, compatible 
alternative.
Miniforge is something that comes with mamba "as conda" and 
automatically uses the big "conda-forge" repository where lots of 
software and libraries are available, packaged by the community.


You can use the command lines from 
https://github.com/conda-forge/miniforge?tab=readme-ov-file#install


After installation I recommend: $ conda config --set auto_activate_base 
false
Otherwise every terminal/shell session will run using a conda 
environment instead of your standard system environment.


Once installed, you can use the "create" line from other previous mail 
to install a QGIS environment. Then "conda activate qgis_3.34" to 
activate it in a terminal session, "qgis" in that same terminal to 
launch that QGIS and just close the terminal or enter "conda deactivate" 
to deactivate it again.


Cheers, Hannes


On 26.02.24 13:41, Bernd Vogelgesang wrote:

Hi Hannes,

Thanks for you answer. I played around before with those snakes and 
that's what maybe brought me into trouble.


And again, this zoo of species starts to confuse me, starting with the 
installer:

Miniforge3 or Miniforge-pypy3 ?
And when does the mamba come into play instead of the conda?

Sorry for me playing the dumb, but I almost spent a week trying to get 
things back to normal here at my desk.


Cheers,
Bernd

Am 26.02.24 um 12:35 schrieb Johannes Kröger (WhereGroup):

Hi Bernd,

a pragmatic solution which I have grown to like is using conda 
environments. Using mamba instead of the default conda via 
https://github.com/conda-forge/miniforge to reduce annoyances and 
then it is for example a simple "conda --create qgis_3.34 qgis=3.34" 
to get a nicely isolated QGIS 3.34 with pdal etc.


Just make sure to deactivate the base environment in your 
terminal/shell, otherwise you are trading one potential mess for 
another ;)


Cheers, Hannes

On 26.02.24 12:10, Bernd Vogelgesang via QGIS-User wrote:

Hi,
using QGIS on the "normal" ubuntu-based Linux Mint for years, I 
again managed to render my system unusable by playing around too 
much, resulting in ever crashing QGIS so I even had to reactivate a 
Windows Virtual Box to be able to work!!


After a hell of problems with NVIDIA graphics drivers (opencl 
support in QGIS), I finally managed to get everything to work with 
Linux Mint Debian edition ... but now had to learn that Debian does 
not provide PDAL for point cloud stuff in the repositories.


Long story short: Can anyone give me recommendations how to get PDAL 
working with QGIS that do NOT include building PDAL and QGIS by myself?

Though I USE Linux for over 15 years,I would prefer avoiding that.
Fumbling around with too less insight on what I am actually doing 
just led me here...


Cheers,
Bernd





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Kappel 17
91355 Hiltpoltstein
Tel: 09192-3499427
mobil: 0163-1860160
m...@berndvogelgesang.deBEGIN:VCARD
VERSION:4.0
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TEL;TYPE=cell;VALUE=TEXT:+

Re: [Qgis-user] QGIS through conda on Linux (was: PDAL on LMDE (Debian) for noobs?)

[Bernd Vogelgesang via QGIS-User]

Hi Hannes,

Thanks for you answer. I played around before with those snakes and 
that's what maybe brought me into trouble.


And again, this zoo of species starts to confuse me, starting with the 
installer:

Miniforge3 or Miniforge-pypy3 ?
And when does the mamba come into play instead of the conda?

Sorry for me playing the dumb, but I almost spent a week trying to get 
things back to normal here at my desk.


Cheers,
Bernd

Am 26.02.24 um 12:35 schrieb Johannes Kröger (WhereGroup):

Hi Bernd,

a pragmatic solution which I have grown to like is using conda 
environments. Using mamba instead of the default conda via 
https://github.com/conda-forge/miniforge to reduce annoyances and then 
it is for example a simple "conda --create qgis_3.34 qgis=3.34" to get a 
nicely isolated QGIS 3.34 with pdal etc.


Just make sure to deactivate the base environment in your 
terminal/shell, otherwise you are trading one potential mess for another ;)


Cheers, Hannes

On 26.02.24 12:10, Bernd Vogelgesang via QGIS-User wrote:

Hi,
using QGIS on the "normal" ubuntu-based Linux Mint for years, I again 
managed to render my system unusable by playing around too much, 
resulting in ever crashing QGIS so I even had to reactivate a Windows 
Virtual Box to be able to work!!


After a hell of problems with NVIDIA graphics drivers (opencl support 
in QGIS), I finally managed to get everything to work with Linux Mint 
Debian edition ... but now had to learn that Debian does not provide 
PDAL for point cloud stuff in the repositories.


Long story short: Can anyone give me recommendations how to get PDAL 
working with QGIS that do NOT include building PDAL and QGIS by myself?

Though I USE Linux for over 15 years,I would prefer avoiding that.
Fumbling around with too less insight on what I am actually doing just 
led me here...


Cheers,
Bernd





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--
Dipl.-Geogr.
Bernd Vogelgesang
Kappel 17
91355 Hiltpoltstein
Tel: 09192-3499427
mobil: 0163-1860160
m...@berndvogelgesang.deBEGIN:VCARD
VERSION:4.0
N:Vogelgesang;Bernd;;;
FN:Dipl-Geogr. Bernd Vogelgesang
EMAIL;PREF=1:m...@berndvogelgesang.de
TEL;TYPE=cell;VALUE=TEXT:+491631860160
TEL;TYPE=work;VALUE=TEXT:+4991923499427
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[Qgis-user] PDAL on LMDE (Debian) for noobs?

[Bernd Vogelgesang via QGIS-User]

Hi,
using QGIS on the "normal" ubuntu-based Linux Mint for years, I again 
managed to render my system unusable by playing around too much, 
resulting in ever crashing QGIS so I even had to reactivate a Windows 
Virtual Box to be able to work!!


After a hell of problems with NVIDIA graphics drivers (opencl support in 
QGIS), I finally managed to get everything to work with Linux Mint 
Debian edition ... but now had to learn that Debian does not provide 
PDAL for point cloud stuff in the repositories.


Long story short: Can anyone give me recommendations how to get PDAL 
working with QGIS that do NOT include building PDAL and QGIS by myself?

Though I USE Linux for over 15 years,I would prefer avoiding that.
Fumbling around with too less insight on what I am actually doing just 
led me here...


Cheers,
Bernd




BEGIN:VCARD
VERSION:4.0
N:Vogelgesang;Bernd;;;
FN:Dipl-Geogr. Bernd Vogelgesang
EMAIL;PREF=1:m...@berndvogelgesang.de
TEL;TYPE=cell;VALUE=TEXT:+491631860160
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Re: [Qgis-user] Re: .csv table

[Bernd Vogelgesang via QGIS-User]

yepp, german speaking.

in case of of need, drop a line to mail at berndvogelgesang.de so I get
notified.

Cheers,
Bernd

Am 27.05.23 um 13:03 schrieb Burt Grabowski:

Hi Bernd,

are you german speaking
coincidentally? Maybe in some hours I will need some help, but I am
trying to make some clear .csv files.

Burt
--
Diese Nachricht wurde von meinem Android Mobiltelefon mit GMX Mail
gesendet.
Am 26.05.23, 21:46 schrieb Bernd Vogelgesang via QGIS-User
:

Hi Burt,

I can give it a try tomorrow.

Cheers,
Bernd

Am 26.05.23 um 16:07 schrieb Burt Grabowski via QGIS-User:
> Dear all,
>
> first of all I want to quickly introduce myself. My name is Burt
and I
> am a student of economics in Austria. I have a special request,
because
> I am an absolute beginner in QGIS, but have no time left. I am
writing
> on my diploma thesis and my supervisor wants to have some cards
in it. I
> spent a whole week, but I am not able to connect a simple .csv
file with
> the shape file. I would probably need 10 to 15 minutes, so who
would
> please have some time left for me for a zoom call, so that I can
create
> some tables for my diploma thesis? I would like to create them
over the
> weekend, because my deadline is getting closer and I cannot find
one
> description of my simple problem.
>
> Regards,
> Burt
>
> --
> Diese Nachricht wurde von meinem Android Mobiltelefon mit GMX Mail
> gesendet.
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Re: [Qgis-user] .csv table

[Bernd Vogelgesang via QGIS-User]

Hi Burt,

I can give it a try tomorrow.

Cheers,
Bernd

Am 26.05.23 um 16:07 schrieb Burt Grabowski via QGIS-User:

Dear all,

first of all I want to quickly introduce myself. My name is Burt and I
am a student of economics in Austria. I have a special request, because
I am an absolute beginner in QGIS, but have no time left. I am writing
on my diploma thesis and my supervisor wants to have some cards in it. I
spent a whole week, but I am not able to connect a simple .csv file with
the shape file. I would probably need 10 to 15 minutes, so who would
please have some time left for me for a zoom call, so that I can create
some tables for my diploma thesis? I would like to create them over the
weekend, because my deadline is getting closer and I cannot find one
description of my simple problem.

Regards,
Burt

--
Diese Nachricht wurde von meinem Android Mobiltelefon mit GMX Mail
gesendet.

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Re: [Qgis-user] Copying collected shape file to another shape file

[Bernd Vogelgesang via QGIS-User]

Hi,
just a wild guess (as I do not work with shape files anymore):
Did you check the properties of the target layer?
Is it a MultiPolygon-Layer or just a Polygon-Layer?

It might be possible that, when the target layer was created outside of
QGIS, that it is plain Polygon, while QGIS always creates Multipolygon
layers.
But I might be wrong

Cheers,
Bernd

Am 18.04.23 um 11:35 schrieb Riccardo via QGIS-User:

Good morning to all,


I need a hint about using Qgis, I hope someone of you could answer me.


I created an area shape file using the collect/multipart operation and
in such a way as to associate several areas to the same tabular record.


I need to copy this shape file to another shape file for a requirement
of a standard delivery.


Unfortunately, the shape file where I copy my original shape file
collected doesn't keep the collect property, and so I have a copied
shape file with every area associated to a unique record and not a a
shape file with more area associated to a unique record as the original
shape file.


How can I conserve this property during the copy between two shape files?


Many thanks!


Best Regards.


Riccardo.




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Re: [Qgis-user] QGIS and historical battle

[Bernd Vogelgesang via QGIS-User]

Hi,
I'm no archaeologist, but I know that there are quite some of them
around on this list.

First short answer: yes, of course!

First counter-question: What kind of geodata is already available to you?

Actually, I think you just need 3 data-sets:
a digital terrain model to find observation spots and valleys
a vector of rivers to find the confluences
a point vector of (historic) towns

Unfortunately you did not mention how big the possible region for this
battle is, so it is hard to guess if it makes sense to create a real
simulation model, or if places can be identified in a semi-manual way.

I think it would be useful to keep the discussion on the list, so others
can learn from the example as well.
Though this is not my business, I am always interested in such kind of
"riddles".

For a starter: There is the great Visibility Analysis Plugin of Zoran
Čučković, where you can create a Visibility Index on a terrain data-set
which I think is exactly meant to identify outlook spots in the
landscape for a given radius.

Cheers,
Bernd


Am 03.02.23 um 09:20 schrieb Lazanu Ciprian-Cătălin via QGIS-User:

Hello,
I want to start a project with a great challenge:

  * first an introduction - a battle between two armies in the medieval
period. we have a few pieces of information regarding this battle:
the number of soldiers from both armies (army A with ~ 25.000/30.000
soldiers and army B between 50.000 and 100.000 - medieval chronicles
have different numbers) and incomplete information regarding the
exact place of the battle. all we know is that it was on a river
valley and the main battle was regarding controlling a bridge at the
confluence of 2 rivers. another clue is that the battle was at a
short distance from an important city (name Town) which is located
in that river valley. Army B was marching on the river valley to
take the city Town and met army A at a short distance from the city.
The battle was around a bridge on the river. That is all we know.
(Army A won that battle).
  * what I want ... I want to see if I could locate that battle (so l
could make some archaeological investigation after that) using some
simulators ... for example: to see how long the marching formation
of army B (50.000 to 80.000/90.000 soldiers) was to see the
distribution on the field/road to city Town.
  * another clue ... we know that the commander of army A (the defender)
had a small base fortification from where he could see and command
the army and make orders. such a place is visible now on a hill from
where you could see at 15 - 20 km down the river valley. (I know
that l could use visibility analysis). On the ground, the surface is
no visible traces of that battle.

This battle is an important historical moment in the history of my
country and has an important local value.
So, is there anything in QGIS or other GIS software something to work so
l can make a simulation or something like that regarding this kind of
activity?
Thank you in advance ... and any suggestions could be sent via email in
private too.
Ciprian

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Re: [Qgis-user] Atlas QGIS en lugar de filas campo atributos

[Bernd Vogelgesang via QGIS-User]

I would like to automate the export of maps with QGIS 3.22 as an atlas
but instead of exporting by rows of a layer, for example municipalities,
I would need to export by columns, that is, I have n columns
corresponding to variables in a layer of points and I would like to get
the same map with different values for each point, n columns.

Thank you very much for the ideas in advance,

Am 13.12.22 um 13:18 schrieb Alejandro Chamizo de Castro via QGIS-User:

Hola,


me gustaría automatizar la exportación de mapas con QGIS 3.22 a modo
de atlas pero en lugar de exportar por filas de una capa, por ejemplo
municipios, necesitaría exportar por columnas, es decir, tengo n
columnas de corresponden a variables en una capa de puntos y quisiera
sacar el mismo mapa con los diferentes valores para cada punto, n
columnas.

Muchas gracias por las ideas de antemano,

--
Alejandro Chamizo de Castro
+34 653681823
Analista SIG

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Re: [Qgis-user] Opening ECW files in QGIS 3.22, Ubuntu 20

[Bernd Vogelgesang via Qgis-user]

you need gdal built with ECW support

https://trac.osgeo.org/gdal/wiki/ECW

never tried that. better try to get the rasters in a supported format or
use a Windows machine (I think with advanced install you can add ECW
support, but I have only Linux over here)


Cheers,

Bernd



Am 21.09.22 um 15:25 schrieb Rosa Lago via Qgis-user:

My operating system is Kubuntu 20.04.

Thank you

22/9/21 15:01(e)an, Rosa Lago via Qgis-user igorleak idatzi zuen:

Hello

I cannot open ECW files in QGIS 3.22. My operating system is Ubuntu
20. I have searched in the websites about it, but it seems
instructions are obsolate.

Please, could you help me with this problem give me some hints?

Thanks a lot

Rosa.


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Re: [Qgis-user] 1 Layout --> 9 Atlas

[Bernd Vogelgesang via Qgis-user]

Hi,
haven't done this in a long time and have no example project at hand, but get a 
first clue here: https://gis.stackexchange.com/a/173443 or here 
https://gis.stackexchange.com/a/339296
Hope others will fill the gaps.

Good luck



On 02.09.22 13:24, Miquel Pujol Garcia via Qgis-user 
 wrote:

*Hi QGISers,*

My question is about Atlas and Layout.

I have a file "polygons.shp" with 30 elements. Every element with ID.
I would like to do a layout sheet with 9 elements different and when
I refresh the view, and the elements change.

There's someone any idea how to do this?

Thanks,
*Miquel Pujol Garcia*


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

[Bernd Vogelgesang via Qgis-user]

so, maybe you should really drop all unneccessary fields or maybe all but an id 
field, and then create a relation to the original database, but in any case I 
would convert that stuff away from ESRI-Shape to Geopackage beforehand, as is 
it is a pita.

On 28.07.22 13:52, krishna Ayyala  wrote:

dbf file itself is 5.1GB. Rest all other files are less than 500MB. It
is the number of records which is huge. It has about 117,2100 points.

On Thu, Jul 28, 2022 at 12:02 AM Bernd Vogelgesang via Qgis-user
mailto:qgis-user@lists.osgeo.org>> wrote:

how big is the dbf file of that shape? Maybe you can also drop some
attributes.

Am 28.07.22 um 03:46 schrieb krishna Ayyala via Qgis-user:
 > 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] Convert huge shapefile to small size

[Bernd Vogelgesang via Qgis-user]

how big is the dbf file of that shape? Maybe you can also drop some
attributes.

Am 28.07.22 um 03:46 schrieb krishna Ayyala via Qgis-user:

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] Dimensioning in QGIS

[Bernd Vogelgesang via Qgis-user]

Hi Ian,

the only way I know of visualizing dimensions so far is by using a
special style: https://github.com/faunalia/QGIS-Resources.git

To be able to use it, you have to install the  "Resource Sharing"-plugin
and then install "Distance Measurement Styles" from there.

This is a quite clever but also a bit confusing approach, cause the
labels with the numbers are actually no labels in the common sense, but
generated as a font markers within the symbology.
You will have to play around with them to make them look as you like.
It may be good not to use thet style on your original features, but
create a separate dimensioning layer (a duplicate of your orginial layer)

Cheers,

Bernd


Am 23.06.22 um 23:33 schrieb IainS via Qgis-user:


Is there a tool for adding dimensions in QGIS. For those who are
wondering what I am talking about, it is common in CAD drafting to add
dimensions to what you have drawn and this is a whole part of a CAD
program where you can format dimensions …etc.

I have been asked to add dimensions to an archaeological hole I am
digging on a QGIS map and I was wondering whether there is a similar
dimensioning tool in QGIS.

Cheers

*Dr Iain Stuart*

*/JCIS Consultants /*

P.O. Box 2397

Burwood North

NSW, 2134

(02) 9701 0191
(0413) 380116 (m)


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Re: [Qgis-user] Adding Geometry table to QGIS

[Bernd Vogelgesang via Qgis-user]

Here is the list of vector formats that get eaten by QGIS:
https://gdal.org/drivers/vector/index.html#
I have no idea about this whole ESRI-SDE-shebang. That they detect their own 
formats is not big surprise though. So better ask ESRI about 
standard-compliance/export of data and so on.

On 01.06.22 15:02, Yamen Tekaji via Qgis-user  wrote:

Hello all,

I am trying to add a table with spatial data (geometry shape column) to
QGIS and view its polygons/points in the QGIS interface.

Unfortunately QGIS does not detect any geometry columns from the tables;
although they can be easily detected in ArcMAP. Please check the snapshots.

Is there a solution for this?
Note: the geometry information has been created by ESRI SDE

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Re: [Qgis-user] Spatial Filter

[Bernd Vogelgesang via Qgis-user]

That is "select by location" and it lives either as the yellow square
with the blue pin in the first row of icons, or search its address in
the toolbox.

Am 24.05.22 um 14:29 schrieb Yamen Tekaji via Qgis-user:

Hello all,

I need to do Spatial Filtering for my data. meaning, to select a
concession (polygon) and to ask QGIS to find all wells (points) that
exist (or does not exist) in this polygon.

is this possible? what is the tool name?

Thanks
Yamen

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Re: [Qgis-user] Questões sobre o QGIS 3.22.5

[Bernd Vogelgesang via Qgis-user]

Ah,

I first understood , that QGIS crashes with this error message.

Obviously, only the error message appears.

To get rid of the message, just deactivate the plugin

-> deepl.com ...

Am 02.04.22 um 15:59 schrieb Bernd Vogelgesang via Qgis-user:



I have installed QGIS 3.22-1, on Windows 64 bits Operating System.
The version installed is Standlone.

When I start the Program this message appears:

Python Error: Unable to load complement 'ProfileFromPoints' Due to an
error calling the Class Factory() method.

Please, how can I solve this?


https://www.deepl.com/translator#pt/en/Instalei%20o%20QGIS%203.22-1%2C%20no%20Sistema%20Operacional%20Windows%2064%20bits.%20A%20vers%C3%A3o%20instalada%20%C3%A9%20a%20Standlone.%0A%0AQuando%20inicio%20o%20Programa%20aparece%20esta%20mensagem%3A%0A%0AErro%20Python%3A%20Imposs%C3%ADvel%20carregar%20complemento%20'ProfileFromPoints'%20Devido%20a%20um%20erro%20ao%20chamar%20o%20m%C3%A9todo%20Class%20Factory().%0A%0APor%20favor%2C%20como%20fa%C3%A7o%20para%20solucionar%20isso%3F

From the message you received it indicates, that the plugin
"ProfileFromPoints" causes problems.
The easiest method to get rid of that problem, is to search for the
plugin's folder in the users directory, and to delete it.
At restart, the plugin will not be loaded, so the problem should be
solved.
The path to the folder is something like
QGIS3\profiles\default\python\plugins


Da mensagem que recebeu indica que o plugin "ProfileFromPoints" causa
problemas.
O método mais fácil para se livrar desse problema, é procurar a pasta
do plugin no directório de utilizadores, e apagá-la.
No reinício, o plugin não será carregado, pelo que o problema deve ser
resolvido.

O caminho para a pasta é algo semelhante a
QGIS3\profiles\default\python\plugins


Am 02.04.22 um 15:29 schrieb Julio Caetano Tomazoni via Qgis-user:


*Instalei o QGIS 3.22-1, no Sistema Operacional Windows 64 bits. A
versão instalada é a Standlone.*

*Quando inicio o Programa aparece esta mensagem:*

*Erro Python: *Impossível carregar complemento 'ProfileFromPoints'
Devido a um erro ao chamar o método Class Factory().

Por favor, como faço para solucionar isso?

Julio Caetano Tomazoni

Geógrafo, Especialista em Cartografia e Georreferenciamento Rural

Mestre e Doutor em geologia

Pós-Doutor em Química

Telefone 46 999756312

caet...@utfpr.edu.br


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Re: [Qgis-user] Questões sobre o QGIS 3.22.5

[Bernd Vogelgesang via Qgis-user]

I have installed QGIS 3.22-1, on Windows 64 bits Operating System. The
version installed is Standlone.

When I start the Program this message appears:

Python Error: Unable to load complement 'ProfileFromPoints' Due to an
error calling the Class Factory() method.

Please, how can I solve this?


https://www.deepl.com/translator#pt/en/Instalei%20o%20QGIS%203.22-1%2C%20no%20Sistema%20Operacional%20Windows%2064%20bits.%20A%20vers%C3%A3o%20instalada%20%C3%A9%20a%20Standlone.%0A%0AQuando%20inicio%20o%20Programa%20aparece%20esta%20mensagem%3A%0A%0AErro%20Python%3A%20Imposs%C3%ADvel%20carregar%20complemento%20'ProfileFromPoints'%20Devido%20a%20um%20erro%20ao%20chamar%20o%20m%C3%A9todo%20Class%20Factory().%0A%0APor%20favor%2C%20como%20fa%C3%A7o%20para%20solucionar%20isso%3F

From the message you received it indicates, that the plugin
"ProfileFromPoints" causes problems.
The easiest method to get rid of that problem, is to search for the
plugin's folder in the users directory, and to delete it.
At restart, the plugin will not be loaded, so the problem should be solved.
The path to the folder is something like
QGIS3\profiles\default\python\plugins


Da mensagem que recebeu indica que o plugin "ProfileFromPoints" causa
problemas.
O método mais fácil para se livrar desse problema, é procurar a pasta do
plugin no directório de utilizadores, e apagá-la.
No reinício, o plugin não será carregado, pelo que o problema deve ser
resolvido.

O caminho para a pasta é algo semelhante a
QGIS3\profiles\default\python\plugins


Am 02.04.22 um 15:29 schrieb Julio Caetano Tomazoni via Qgis-user:


*Instalei o QGIS 3.22-1, no Sistema Operacional Windows 64 bits. A
versão instalada é a Standlone.*

*Quando inicio o Programa aparece esta mensagem:*

*Erro Python: *Impossível carregar complemento 'ProfileFromPoints'
Devido a um erro ao chamar o método Class Factory().

Por favor, como faço para solucionar isso?

Julio Caetano Tomazoni

Geógrafo, Especialista em Cartografia e Georreferenciamento Rural

Mestre e Doutor em geologia

Pós-Doutor em Química

Telefone 46 999756312

caet...@utfpr.edu.br


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Re: [Qgis-user] WG: drop down Vektor not opening

[Bernd Vogelgesang via Qgis-user]

Nowadays, before reeinstalling QGIS, it is better to first check on
creating a new profile

Settings -> User Profile -> New Profile

This will give a fresh and clean "new" QGIS.

When there are problems with QGIS, it is most unlikely that the code
base is currupted. It is much more likely that plugins, settings etc.
get screwed.

Am 17.03.22 um 13:58 schrieb Lengenfelder, Michael via Qgis-user:


Dear community,

I have a problem since 2 days, the menü ‘Vektor’ doesn´t open anymore.
I reinstalles the software, but no help.

It´s 3.16.9 ‘Hannover’

thanks for help


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Re: [Qgis-user] QGIS layer styles not persisting in project

[Bernd Vogelgesang via Qgis-user]

ahh, this feature must have slipped in without noticing.

I knew only Properties-> Style -> add...  and tried this years ago. It
didn't work well by this time so I forgot about it.

Anyway, so it seems you expect, that when you switch a style for a
layer, and then add a theme, that this style will be preserved for the
layer in this theme?

p.s. better send you mails withour you logo. Answering with quoting
already exceeds the 100kb per mail.

Am 16.03.22 um 13:50 schrieb Yvan CALCAGNI:


Bernd, indeed you can have several named styles for one layer, Qgis
allows that

Right-click the layer to open the context menu --> Go toStyles-->Add



Le 16/03/2022 à 13:15, Bernd Vogelgesang via Qgis-user a écrit :

How can one multiply a style for one layer?
You can duplicate a layer multiple times and create an own style for
each and then set an indivual theme.
If thats what you do, and it doesn't work, i have no clue.

Layer styles are always saved in project files by default.
What do you mean with other format?



On 16.03.22 12:18, Yvan CALCAGNI via Qgis-user
 wrote:

Hi everyone,
in one of my project I'm setting up multiple styles for one the layers,
to make these styles matching the right project theme.

So I save the project but every times I'm re-opening it, layer styles
have disappeared.  Layer styles are never saved in project file? To
make
it work, the only solution is it to have geopackage layers (with
embedded style permitted by that format)? What if the layer is in
another format? multiple layer styles are forbidden in that case?

I'm running Qgis 3.24 standalone

Thank you guys!



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Re: [Qgis-user] QGIS layer styles not persisting in project

[Bernd Vogelgesang via Qgis-user]

How can one multiply a style for one layer?
You can duplicate a layer multiple times and create an own style for each and 
then set an indivual theme.
If thats what you do, and it doesn't work, i have no clue.

Layer styles are always saved in project files by default.
What do you mean with other format?



On 16.03.22 12:18, Yvan CALCAGNI via Qgis-user  
wrote:

Hi everyone,
in one of my project I'm setting up multiple styles for one the layers,
to make these styles matching the right project theme.

So I save the project but every times I'm re-opening it, layer styles
have disappeared.  Layer styles are never saved in project file? To make
it work, the only solution is it to have geopackage layers (with
embedded style permitted by that format)? What if the layer is in
another format? multiple layer styles are forbidden in that case?

I'm running Qgis 3.24 standalone

Thank you guys!



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Re: [Qgis-user] points to polygons conversion

[Bernd Vogelgesang via Qgis-user]

Well, yes, thats sounds like nonsense ;)

The only thing I could think of is trying to make voronoi polygons
(toolbox) on those centroids, but for sure this will not bring up any
usefull findings.




Am 16.03.22 um 11:04 schrieb Francesca Parente via Qgis-user:

Hello group,

I'd have a question I hope it doesn't sound too nonsense to you: I'm
working on a points shapefile, which I know has been created by
centroids of polygons- but I don't have access to polygonal areas.
I would need to select just those in some locations and recover their
original area within polygonal borders.

Is there a chance I can get it done by having this shapefile of
centroids only?!

Thanks a lot for your time and good day to all,
Francesca
--

Francesca Parente

_ SESS Euro PhD
 in
SocioEconomic and Statistical Studies
_ Luiss SEP  School of European Political Economy

email: francescaparente@gmail.com
paren...@luiss.it


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Re: [Qgis-user] Centra la vista in un punto

[Bernd Vogelgesang via Qgis-user]

Which plugin should I install to query the map from x and y coordinates
and get the point on the map?

https://www.deepl.com


Am 13.03.22 um 09:49 schrieb SB via Qgis-user:


Quale plugin installare per interrogare la mappa partendo dalle
coordinate x e y ed ottenere ò'indicazione del punto sulla mappa?


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Re: [Qgis-user] Importing spreadsheet: Strange behaviour

[Bernd Vogelgesang via Qgis-user]

Hi Micha,

thank you.

And where in this theoretical situation exactly do you use drag and drop
of spreadsheets to the canvas in this process?

Bernd


Am 13.03.22 um 09:56 schrieb Micha Silver:


On 13/03/2022 10:37, Bernd Vogelgesang wrote:


Hi Micha,


can you elobrate a bit more on these situations where the data has no
column header, cause I don't know them.




Well, just a few theoretical examples:

I might have several tables of data from some sensor (i.e. rainfall,
temperature) with dates, long/lat and column headers. Merging all the
tables would cause the column headers to get repeated for each table.
I usually just remove *all* column headers, then import, and point to
the correct columns for long/lat.


When I extract values from a multiband raster at point locations (for
some ML model) I get just columns of values; the actual column names
are not important.


Hope that clarifies.



Bernd


Am 13.03.22 um 09:35 schrieb Micha Silver:



On 13/03/2022 10:22, Bernd Vogelgesang via Qgis-user wrote:


Hi Andrea,

thanx for clarifying.

imho this is not a "wise" design decision. Maybe I am too less a
pro, but i can't think of any situation when someone seriously
working with table data does NOT want to have a column header. What
would be the advantage of that?



There are situations where the data table contains only data: no
column headers.



Ok, if this is a GDAL-design decision, then at least QGIS should
have default settings in the environment preventing this.

An ordinary user will never ever expect this behaviour nor find
this setting by himself.

Cheers,

Bernd


Am 13.03.22 um 08:55 schrieb Andrea Giudiceandrea:

*Bernd Vogelgesang*
/Sat Mar 12 14:13:04 PST 2022/


So: All-string tables will not be imported correctly. Always e.g.
add an
id-field with number


Hi Bernd,
this is by design:
https://github.com/OSGeo/gdal/blob/1c5bc766513c4407f702bd8cd8bfa958ed61cfea/ogr/ogrsf_frmts/xlsx/ogrxlsxdatasource.cpp#L597-L598

Am 12.03.22 um 23:04 schrieb Jonas Küpper://

>/what should have fixed it as well would be to pass
OGR_XLSX_HEADERS = />/FORCE to the provider while loading
xlsx-files but a i couldn't find a />/way how to do that. (see
https://gdal.org/drivers/vector/xlsx.html) /


Hi Jonas,
you can set a GDAL/OGR configuration option, like
OGR_XLSX_HEADERS, via the "Settings" -> "Options" -> "System" ->
"Environment" setting panel in QGIS.

Regards.

Andrea Giudiceandrea


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--
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918



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Re: [Qgis-user] Importing spreadsheet: Strange behaviour

[Bernd Vogelgesang via Qgis-user]

Hi Micha,


can you elobrate a bit more on these situations where the data has no
column header, cause I don't know them.


Bernd


Am 13.03.22 um 09:35 schrieb Micha Silver:



On 13/03/2022 10:22, Bernd Vogelgesang via Qgis-user wrote:


Hi Andrea,

thanx for clarifying.

imho this is not a "wise" design decision. Maybe I am too less a pro,
but i can't think of any situation when someone seriously working
with table data does NOT want to have a column header. What would be
the advantage of that?



There are situations where the data table contains only data: no
column headers.



Ok, if this is a GDAL-design decision, then at least QGIS should have
default settings in the environment preventing this.

An ordinary user will never ever expect this behaviour nor find this
setting by himself.

Cheers,

Bernd


Am 13.03.22 um 08:55 schrieb Andrea Giudiceandrea:

*Bernd Vogelgesang*
/Sat Mar 12 14:13:04 PST 2022/

So: All-string tables will not be imported correctly. Always e.g. add an
id-field with number


Hi Bernd,
this is by design:
https://github.com/OSGeo/gdal/blob/1c5bc766513c4407f702bd8cd8bfa958ed61cfea/ogr/ogrsf_frmts/xlsx/ogrxlsxdatasource.cpp#L597-L598

Am 12.03.22 um 23:04 schrieb Jonas Küpper://

>/what should have fixed it as well would be to pass OGR_XLSX_HEADERS = 
/>/FORCE to the provider while loading xlsx-files but a i couldn't
find a />/way how to do that. (see https://gdal.org/drivers/vector/xlsx.html) /


Hi Jonas,
you can set a GDAL/OGR configuration option, like OGR_XLSX_HEADERS,
via the "Settings" -> "Options" -> "System" -> "Environment" setting
panel in QGIS.

Regards.

Andrea Giudiceandrea


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--
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918
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Re: [Qgis-user] Importing spreadsheet: Strange behaviour

[Bernd Vogelgesang via Qgis-user]

Hi Andrea,

thanx for clarifying.

imho this is not a "wise" design decision. Maybe I am too less a pro,
but i can't think of any situation when someone seriously working with
table data does NOT want to have a column header. What would be the
advantage of that?

Ok, if this is a GDAL-design decision, then at least QGIS should have
default settings in the environment preventing this.

An ordinary user will never ever expect this behaviour nor find this
setting by himself.

Cheers,

Bernd


Am 13.03.22 um 08:55 schrieb Andrea Giudiceandrea:

*Bernd Vogelgesang*
/Sat Mar 12 14:13:04 PST 2022/

So: All-string tables will not be imported correctly. Always e.g. add an
id-field with number


Hi Bernd,
this is by design:
https://github.com/OSGeo/gdal/blob/1c5bc766513c4407f702bd8cd8bfa958ed61cfea/ogr/ogrsf_frmts/xlsx/ogrxlsxdatasource.cpp#L597-L598

Am 12.03.22 um 23:04 schrieb Jonas Küpper://

>/what should have fixed it as well would be to pass OGR_XLSX_HEADERS = />/FORCE 
to the provider while loading xlsx-files but a i couldn't find a />/way how to do 
that. (see https://gdal.org/drivers/vector/xlsx.html) /


Hi Jonas,
you can set a GDAL/OGR configuration option, like OGR_XLSX_HEADERS,
via the "Settings" -> "Options" -> "System" -> "Environment" setting
panel in QGIS.

Regards.

Andrea Giudiceandrea
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Re: [Qgis-user] Importing spreadsheet: Strange behaviour

[Bernd Vogelgesang via Qgis-user]

Caramba!

That did the trick indeed! Added a field "dummy" and some numbers in the
next rows and gave it a try: Tada! All headers there.

So: All-string tables will not be imported correctly. Always e.g. add an
id-field with number

Thanx a ton!

Bernd

Am 12.03.22 um 23:04 schrieb Jonas Küpper:


Hi Bernd,

for what its worth: I experienced these Field1, Field2 troubles
recently as well. The problem is that gdal apparently does not assume
headers in a table, if all columns are string data. What usually fixes
that for me is to add a dummy column where the first row (the header)
is a string eg. "dummy" but all the subsequent rows are numbers. i
stumbled over this behavior in the sources
https://github.com/OSGeo/gdal/blob/1a30b3fab043a918e78cac7cc035ddc2670a9ba9/ogr/ogrsf_frmts/xlsx/ogrxlsxdatasource.cpp#L575
.

what should have fixed it as well would be to pass OGR_XLSX_HEADERS =
FORCE to the provider while loading xlsx-files but a i couldn't find a
way how to do that. (see https://gdal.org/drivers/vector/xlsx.html)

Cheers

Jonas


On 11.03.2022 21:52, Bernd Vogelgesang wrote:

Hi Chris,

mhm.
There are only two columns with ordinary names.
The data holds some special characters, and first I thought this
might influence the process as well. But the version where I deleted
those entries does not behave differently.
Very strange.

Meanwhile, I exported the file to a csv, imported this one
successfully and then saved as gpkg. So at least, the data is in and
working.


Thanks,
Bernd


Am 11.03.22 um 21:38 schrieb chris hermansen:

Bernd and list,

On Fri, Mar 11, 2022, 12:08 Bernd Vogelgesang via Qgis-user
 wrote:

Hi folks,

for quite some time, I hold frequently changing data in a xlsx-file.
Working in a spreadsheet application is so much more efficient
sometimes.

This spreadsheet easily imports by drag and drop, the import
dialog pops
up where to choose which tab to import, and finally the table is
there
with the first row as column heads.

Now, I'm getting just nuts.

I'm trying to do the same with other data, and whatever I try, it
imports the table ignoring the header row, so its Field1, Field2...

Findings so far:

I had a long file name. With this, there was no import dialog,
but the
first tab was imported immediately, but without the header row.

I saved the file with a short file name, and now the import
dialog asks
which tab to import. But still, the first data-row is ignored.

Dragging my other already existing file into that project works just
perfectly.

What could be the reason for this behaviour?


Clutching at straws here...

Sometimes when making a pivot table in LibreOffice calc I notice
that column headings (first row) aren't interpreted as such.

This seems to occur on the following scenarios:

1) a column has an en empty cell in row 1 (or missing title)

2) a column exists outside the area of interest with no header (this
probably would not apply in your case, but maybe you have some
calculations to the right of your data which don't have a column header)

3) there are some "strange" characters in one or more header fields
(I can't recall precisely what constitutes "strange")


What you might want to do is save a copy of your spreadsheet, then
delete anything to the left or right of your columns, and check that
your column names are all "legal variable" names ie begin with a
letter, only letters and numbers

I hope this helps; good luck!

Chris
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Re: [Qgis-user] Automating creation of county distribution maps

[Bernd Vogelgesang via Qgis-user]

Hi Mike and list,

I took the challenge and so far succeeded at the very moment. Mike sent
me a (not so clean list) of species and counties.

My idea was to produce an atlas. (Actually, it should be made by a
report, but since those are a bit quirky still, I went the pure atlas way)

It's a bit hacky, a more straightforward way would be nice.

- cleaning the data and importing them (table species/county, county
polygons)

- create table of individual species (toolbox "Delete duplicates by
attribute") -> 101 unique species

- Setting up a relation between county layer and species/county-table on
the county name

- new text field in county layer "species" :

relation_aggregate('name_of_relation', 'concatenate', "species_names", ',')

this creates a comma-separated list of species for each county polygon

Prepare Atlas

Coverage layer: (fake coverage, as it does not move)

- create bounding box of the county-layer (Extract layer extent)

- take list of individual species and add the geometry: retrieved the
wkt of the extent in the field calculator -> "Geometry by expression":
geom_from_wkt('Polygon ((355937 4117435, 782844 4117435, 782844 4498773,
355937 4498773, 355937 4117435)')

-> 101 extents with species name as atlas coverage

- create new map layout

- Activating atlas, setting species name-field as page name

- duplication of the county-layer and setting up a rule based style:

visible: array_contains( string_to_array( "species_names",','),
@atlas_pagename)

invisible: else

this query will look for the pagename (= species name) in the array of
species names in the county polygons, and if the name is in, then the
polygon is shown in grey, alse transparent.

add text field @atlas_pagename

set atlas output filename to @atlas_pagename

Export atlas as images

DONE

Question: is there a way to aggregate the species per county without
setting up that relation beforehand? This is an extra step which would
be nice if it could be circumvented by some cool function.

Any ideas or comments?

Am 12.03.22 um 10:04 schrieb Jésahel Benoist via Qgis-user:

Hello Mike,

I tried to follow your question and the most I read the less I
understand !
Could you simply explain what you want to see, what action the user
have to do and what he gets?
For this, try to give input data and what will link them : plants
(table with plant name and states distribution?), states (geometric
data with states names?), columns to link...
The good point is that I'm sure QGIS can do this. But nobody will
engage work if objective isn't precise enough.

Regards,

J. B.


Le ven. 11 mars 2022 à 21:50, Mike Breiding - Morgantown WV via
Qgis-user  a écrit :

I had the range USA range map in the screen shot and have since
updated
it. https://photos.app.goo.gl/ktn5quT6s6SRwrzBA
WV-Mike

On 3/10/2022 11:04 AM, chris hermansen wrote:
> Perhaps others are better understanding how you want to
visualize the
> distributions, but what I get from your description is that if
you have
> 100 (or 2500) species then you will have 100 (or 2500) maps, which
> sounds unwieldy to me.

I neglected to mention the use for the distribution maps.
They will be used in a print brochure.
A page mock up can be seen here:
https://photos.app.goo.gl/ktn5quT6s6SRwrzBA

The USA distribution map in the mock up was made in Qgis using the
information from:
https://plants.usda.gov/home/plantProfile?symbol=BODI2

This is interactive and will display down to the state and county
level.
However, they are not up to date at the state/county level. If
they were
I would simply make a screen shot and that would be the end of it.

The state distribution map used in the mock up was made using Qgis
based
on data from the West Virginia University Herbarium which has the
most
up to date information on distribution.

WV-Mike



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Re: [Qgis-user] Importing spreadsheet: Strange behaviour

[Bernd Vogelgesang via Qgis-user]

Hi Chris,

mhm.
There are only two columns with ordinary names.
The data holds some special characters, and first I thought this might
influence the process as well. But the version where I deleted those
entries does not behave differently.
Very strange.

Meanwhile, I exported the file to a csv, imported this one successfully
and then saved as gpkg. So at least, the data is in and working.


Thanks,
Bernd


Am 11.03.22 um 21:38 schrieb chris hermansen:

Bernd and list,

On Fri, Mar 11, 2022, 12:08 Bernd Vogelgesang via Qgis-user
 wrote:

Hi folks,

for quite some time, I hold frequently changing data in a xlsx-file.
Working in a spreadsheet application is so much more efficient
sometimes.

This spreadsheet easily imports by drag and drop, the import
dialog pops
up where to choose which tab to import, and finally the table is there
with the first row as column heads.

Now, I'm getting just nuts.

I'm trying to do the same with other data, and whatever I try, it
imports the table ignoring the header row, so its Field1, Field2...

Findings so far:

I had a long file name. With this, there was no import dialog, but the
first tab was imported immediately, but without the header row.

I saved the file with a short file name, and now the import dialog
asks
which tab to import. But still, the first data-row is ignored.

Dragging my other already existing file into that project works just
perfectly.

What could be the reason for this behaviour?


Clutching at straws here...

Sometimes when making a pivot table in LibreOffice calc I notice that
column headings (first row) aren't interpreted as such.

This seems to occur on the following scenarios:

1) a column has an en empty cell in row 1 (or missing title)

2) a column exists outside the area of interest with no header (this
probably would not apply in your case, but maybe you have some
calculations to the right of your data which don't have a column header)

3) there are some "strange" characters in one or more header fields (I
can't recall precisely what constitutes "strange")


What you might want to do is save a copy of your spreadsheet, then
delete anything to the left or right of your columns, and check that
your column names are all "legal variable" names ie begin with a
letter, only letters and numbers

I hope this helps; good luck!

Chris
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[Qgis-user] Importing spreadsheet: Strange behaviour

[Bernd Vogelgesang via Qgis-user]

Hi folks,

for quite some time, I hold frequently changing data in a xlsx-file.
Working in a spreadsheet application is so much more efficient sometimes.

This spreadsheet easily imports by drag and drop, the import dialog pops
up where to choose which tab to import, and finally the table is there
with the first row as column heads.

Now, I'm getting just nuts.

I'm trying to do the same with other data, and whatever I try, it
imports the table ignoring the header row, so its Field1, Field2...

Findings so far:

I had a long file name. With this, there was no import dialog, but the
first tab was imported immediately, but without the header row.

I saved the file with a short file name, and now the import dialog asks
which tab to import. But still, the first data-row is ignored.

Dragging my other already existing file into that project works just
perfectly.

What could be the reason for this behaviour?


Cheers,

Bernd




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Re: [Qgis-user] Attachment and links used for this list.

[Bernd Vogelgesang via Qgis-user]

Attachments are allowed, but you have to keep it under 100kb! So better sth 
like 50kb, if you also have a lot of textwith it

On 09.03.22 18:07, Mike Breiding - Morgantown WV via Qgis-user 
 wrote:

Apparently attachments are not permitted and HTML links are scrubbed.
How does one share a graphic with the list?
WV-Mike


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Re: [Qgis-user] question about DATE of satellite ESRI and Google basemaps in QuickMapServices Plugin

[Bernd Vogelgesang via Qgis-user]

Hi,

I can remember that there was this question a while ago. Though I do not 
remember the answer.

But my guess is, that in Google Earth e.a. , you are shown the year of the 
picture, while those in Google Maps e.g. are sometimes different, and there is 
no way to find out how old they are.

Maybe for the ESRI-stuff you might have more luck using their REST-service to 
load those images (did this lng time ago, have no clue anymore)


Cheers,

Bernd

On 10.03.22 19:44, Nick Jadallah via Qgis-user  
wrote:

Hello,

I have installed QuickMapServices for QGIS to have more basemap options.
I have used the "Google Satellite" and "ESRI Satellite" basemaps. It
just occurred to me that the YEAR in which these maps were published
(i.e. which year the satellite image data is from) is important for my
project. Do you know what year they are from? Or, if not, do you know
where I can find this information?

Thank you very much for any help or guidance you can provide!


-Nick

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Re: [Qgis-user] Automating creation of county distribution maps

[Bernd Vogelgesang via Qgis-user]

As long as the informations are this vague and we do not know what his
data-sets looks alike, there is no use in proposing a workflow.

The spreadsheet approach sounds horrible to me ;)

Bernd


Am 10.03.22 um 18:49 schrieb Nicolas Cadieux via Qgis-user:

Hi,

I’am not quite sure what processes you want automated but if the step
previously described suit your needs, then all the steps could be
incorporated into a model and this model, like any algorithm found in
« processing » can be batched.

Nicolas Cadieux
https://gitlab.com/njacadieux


Le 10 mars 2022 à 08:07, Mike Breiding - Morgantown WV via Qgis-user
 a écrit :


I appreciate you taking the time for writing such a detailed set of
instructions.
However, it is quicker for me to do it manually.

If the process could be automated then of course it would be a
different matter.
I am working only with the ferns - less than a hundred records.
The flower plants are over 2500.

Thanks,
WV-Mike
=
On 3/9/2022 3:46 PM, David Strip wrote:

As first step towards building a model as Nicolas has suggested:
I assume you have a layer with the county boundaries. Export this
layer as a CSV file, keeping only the name of each county in the
export step, and don't export the geometry.
Now open this file in your spreadsheet app of choice.
Add a new column for each plant species.
Put a one in that column for each county where the species is present.
Save the file (still as CSV).

Open the county layer and the new CSV files in Ggis.
Open the properties window for the county layer and click on the
Joins tab.
Click on the "+" to add a new join. Join to the CSV layer, and
select the county names field as the join field for each.

Now your county layer has the plant species column.
To display a single species, open the properties window for the
county layer, select symbology. Set the symbology as rule based. To
color just those counties with species 1, your rule would say
something like Species1 = 1, where Species1 is the field name you
used. Pick a color/transparency of your choice, then set the "all
others" rules to be the background color you want.

That does it for one species. You can then export to tiff or
whatever. Getting it to cycle through all the different species is
for someone else to explain.


-- Mike Breiding www.EpicRoadTrips.us
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