Re: [Qgis-user] Removal of overlap geometries within the same layer - merge to largest neighbor polygon

[Wouter Impens via QGIS-User]

Hi Andreas,

You could do a ' self-intersect'  of the polygon layer, calculate the area,
select polygons under specific area (assuming they're small overlaps) and
run the ' eliminate selected polygons' tool.
The GRASS tool v.clean offers some solutions too.

Greetings
Wouter

Op di 25 jul 2023 om 12:02 schreef Andreas Neumann via QGIS-User <
qgis-user@lists.osgeo.org>:

> Hi,
>
> A friend of mine has a dirty input data set with lots of overlapping
> geometries (within the same layer) and asked me if there is a tool within
> QGIS to automatically remove the overlaps and assign the overlapping area
> to the neighbor polygon with the largest area.
>
> The solution was surprisingly hard to find, although I am pretty sure
> there are multiple combinations of algorithms that would solve the problem.
> Here is the solution I came up with: 
> https://github.com/qgis-ch/overlap_removal/tree/main
> - perhaps you have better ideas - more elegant solutions?
>
> Wouldn't it be great if QGIS had a processing tool to solve this overlap
> cleaning within the same layer "out of the box" without having to use a
> graphical model or a more or less complicated sequence of algorithms in the
> processing toolbox? Apparently, ArcGIS has such a tool ...
>
> Saga and GRASS also might have such tools - but I couldn't get the SAGA
> based QGIS plugin "Dissect and dissolve overlaps" (
> https://plugins.qgis.org/plugins/dissect_dissolve_overlaps).
>
> The same problem exists for automatically filling small gaps in the
> polygon data set ...
>
> Andreas
>
>
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Re: [Qgis-user] Drag/drop style.qml files?

[Wouter Impens via Qgis-user]

Hi Richard,

I think you've been dreaming about the .qlr file :)
Difference between Layer Definition File (qlr) and QGIS Layer Style File
(qml)? - Geographic Information Systems Stack Exchange


Greetings
Wouter

On Thu, 25 Aug 2022 at 11:14, Richard Duivenvoorde via Qgis-user <
qgis-user@lists.osgeo.org> wrote:

> Hi,
>
> Did I dream about this, or did I see some demo somewhere about dragging
> and dropping a style layer file (.qml) on a layer (in the layer panel) to
> style a layer?
>
> I just tried, and failed, I googled but hit only info about Qt-QML...
>
> Anybody can help me? Dream or Reality :-) ?
>
> Regards,
>
> Richard Duivenvoorde
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Re: [Qgis-user] QGIS WINDOWS 11

[Wouter Impens via Qgis-user]

Hi,

I've been using QGIS LTR on windows 11 for some time now, I didn't
encounter any issues..

Greetings
Wouter

Op wo 15 jun. 2022 om 11:23 schreef Johannes Kröger (WhereGroup) via
Qgis-user :

> Hey Samuel,
>
> it's hard to give guarantees when it comes to software but: I don't think
> there should be any issues with *modern* QGIS versions on Windows 11. QGIS
> 3.4 is 3 years old though and in no way supported any more. Please try to
> use QGIS 3.22 or later if you are worried about modern Windows support.
>
> Cheers, Hannes
> Am 15.06.22 um 08:09 schrieb sam via Qgis-user:
>
> Hello !
>
>
>
> I’m about to buy a new computer for my next year of university. I’ll have
> some Qgis lessons and I would like to know if all the Qgis versions are
> compatibles with Windows 11 (espacially the 3.4.9 ones).
>
>
>
> Thanks for your help !
>
>
>
> Samuel
>
>
>
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Re: [Qgis-user] Problem merging 30-m SRTM tiles in QGIS 3.24.3 for MacOS 10.14.6

[Wouter Impens via Qgis-user]

Hi Walter,

I'm having good results using the 'r.patch' tool from GRASS for merging
rasters.

Hope this helps

Greetings
Wouter

Op do 19 mei 2022 om 23:31 schreef Walter Alvarez via Qgis-user <
qgis-user@lists.osgeo.org>:

>
> I’m trying to merge either two or twelve 30-m SRTM tiles using QGIS
> 3.14.3.  In either case (2 or 12) I am stopped by the following problem:
>
> Using Raster > Miscellaneous > Merge…
>
> I get the “Merge" window.   I try to use Input layers > Elements selected
> > “…"
>
> That takes me to the "Multiple Selection" window, showing the 2 or 12
> files I want to merge (filenames:   nXXeXXX_1arc_v3 [EPSG:4326]).
>
> After selecting all the files, when I click “OK”   the "Multiple Selection
> Window” and the “Merge” window both disappear, and I cannot figure out what
> to do next, or do differently.
>
> I can’t figure out how to get past this problem and merge my tiles.
>
> Thanks for any help you can offer!
>
> Walter
>
> __
>
>
> Walter Alvarez
> Professor of the Graduate School
> Department of Earth and Planetary Science
> University of California Berkeley
>
>
>
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Re: [Qgis-user] Write vector attribute table from pandas dataframe

[Wouter Impens via Qgis-user]

Hi,

If you have a field to join on, you could export the dataframe to something
that is readable in QGIS like csv or xlsx

Greetings
Wouter

Op za 23 apr. 2022 om 19:34 schreef Nicolas Cadieux via Qgis-user <
qgis-user@lists.osgeo.org>:

> Hi Ming,
>
> The best thing would be to show your code and ask others how it can be
> optimized.  I find that https://gis.stackexchange.com/ is the best place
> to do this but this user list definitely has some very  competent
> programmers.  Not being one of those competent programmers, I will just
> state that pandas and geopandas use a process called vectorization where
> the “for loop” is done for you.
>
>
> https://medium.com/analytics-vidhya/understanding-vectorization-in-numpy-and-pandas-188b6ebc5398
>
> This means that looping over elements in a dataframe can be MUCH slower
> than using vectorization.  So basically, you need to figure out the right
> code and avoid “for loops“ when using dataframes.
>
> Hope this helps
>
> Nicolas Cadieux
> https://gitlab.com/njacadieux
>
> Le 22 avr. 2022 à 11:50, ming han via Qgis-user 
> a écrit :
>
> 
> Hi everyone
>
>  Is there an efficient way to copy data in a pandas dataframe to the
> vector attribute table?
>
>   I am looping element by element, which is very slow.
>
> Thanks
> Ming
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Re: [Qgis-user] Center line of an elongated BASIN

[Wouter Impens]

Hi,

The HCMGIS plugin has a 'skeleton / medial axis' tool in it , it works fine
to get a centerline!

cheers
Wouter

Op do 10 feb. 2022 om 23:47 schreef Allan López :

> Yes, it does.
>
> Thanks a lot indeed. I am testing it.
>
> Best,
>
> Allan
>
> El jue, 10 feb 2022 a la(s) 15:19, Alexis R.L. (alroyl...@gmail.com)
> escribió:
>
>> As far as I know v.voronoi.skeleton in gdal is the closest thing we have
>> that can do this in base QGIS.
>>
>> I hope this helps,
>>
>> Alex
>>
>> Le mer. 9 févr. 2022 à 17:57, Allan López  a écrit :
>>
>>> Dear All, I need to calculate and display the center line of an
>>> elongated river basin ( not the center of the main river trunk) from a SHP.
>>>
>>> Thank's in advance.
>>>
>>> Allan Lopez
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Re: [Qgis-user] Bulk export atlas not working

[Wouter Impens]

Hi list,

I can solve the problem by making new layouts, the ones I was using were
made before updating QGIS and the plugin.
Just in case someone has the same problem...

Greetings
Wouter

Op ma 20 dec. 2021 om 10:14 schreef Dietrich Heintz :

> Hi Wouter,
> would it be an option to uncheck "Single file export" and later merge the
> documents into one?
> ciao Dieter
>
> On 20.12.2021 10:10, Wouter Impens wrote:
>
> Hi Dieter,
>
> You can export an atlas to a single pdf, with multiple pages. The QGIS
> function in the layout is working fine but when I try to automate the
> process, There's only a pdf with the last page. By watching the process, I
> can see that all the pages are made but they overwrite themselves.
> The output is configured like this:
> [image: image.png]
> The automatisation with the 'maps printer plugin' used to work fine, It's
> not clear to me why it is not working now.
>
>
> Cheers
> Wouter
>
>
> Op ma 20 dec. 2021 om 10:00 schreef Dietrich Heintz :
>
>> Hello Wouter,
>> what do you mean with overwriting themselves. The Atlas needs a value for
>> the filename, which is derived from an entry of the reference geometry?
>> ciao Dieter
>>
>> On 20.12.2021 09:36, Wouter Impens wrote:
>>
>> Hi Hannes,
>>
>> Thanks for your answer.
>> The names are unique. But the problem is not that one atlas layout is
>> overwriting another, they're overwriting themselves. Ik only get the last
>> page of each atlas.
>> While the atlas is exporting, I can see in the windows explorer that a
>> file is made and then reset to 0, only the last atlas page is kept.
>>
>> Greetings
>> Wouter
>>
>> Op ma 20 dec. 2021 om 09:28 schreef Johannes Kröger (WhereGroup) <
>> johannes.kroe...@wheregroup.com>:
>>
>>> Hey Wouter,
>>>
>>> what is the atlas' expression for the filenames? Make sure they are
>>> unique, iterating and/or writing to a unique directory.
>>>
>>> Cheers, Hannes
>>>
>>> Am 18.12.21 um 18:51 schrieb Wouter Impens:
>>>
>>> Dear list,
>>>
>>>
>>>
>>> When using the ‘maps printer’ plugin for a bunch of atlas layouts, the
>>> atlas pages are constantly overwritten by the next page, so I end up with
>>> only the last page in the atlas layout.
>>>
>>> I used this before and it was working perfectly.
>>>
>>> I also tried with the following script:
>>>
>>>
>>>
>>> import qgis.core
>>>
>>> layouts_list = QgsProject.instance().layoutManager().printLayouts()
>>>
>>> for layout in layouts_list:
>>>
>>> QgsLayoutExporter.exportToPdfs(layout.atlas(),
>>>
>>>
>>> 
>>> 'C:\\Users\\d08909\\Documents\\01_WERKMAP\\03_EXPORT\\',
>>>
>>>
>>> QgsLayoutExporter.PdfExportSettings())
>>>
>>>
>>>
>>> But it’s giving me the same result.
>>>
>>>
>>>
>>> Manually exporting the altlas layouts one by one is no problem.
>>>
>>>
>>>
>>> I’m using QGIS 3.16.14 on windows.
>>>
>>>
>>>
>>> Any help is apreciated!
>>>
>>>
>>>
>>> Kind regards,
>>>
>>> Wouter Impens
>>>
>>>
>>>
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Re: [Qgis-user] Bulk export atlas not working

[Wouter Impens]

Hi Dieter,

You can export an atlas to a single pdf, with multiple pages. The QGIS
function in the layout is working fine but when I try to automate the
process, There's only a pdf with the last page. By watching the process, I
can see that all the pages are made but they overwrite themselves.
The output is configured like this:
[image: image.png]
The automatisation with the 'maps printer plugin' used to work fine, It's
not clear to me why it is not working now.


Cheers
Wouter


Op ma 20 dec. 2021 om 10:00 schreef Dietrich Heintz :

> Hello Wouter,
> what do you mean with overwriting themselves. The Atlas needs a value for
> the filename, which is derived from an entry of the reference geometry?
> ciao Dieter
>
> On 20.12.2021 09:36, Wouter Impens wrote:
>
> Hi Hannes,
>
> Thanks for your answer.
> The names are unique. But the problem is not that one atlas layout is
> overwriting another, they're overwriting themselves. Ik only get the last
> page of each atlas.
> While the atlas is exporting, I can see in the windows explorer that a
> file is made and then reset to 0, only the last atlas page is kept.
>
> Greetings
> Wouter
>
> Op ma 20 dec. 2021 om 09:28 schreef Johannes Kröger (WhereGroup) <
> johannes.kroe...@wheregroup.com>:
>
>> Hey Wouter,
>>
>> what is the atlas' expression for the filenames? Make sure they are
>> unique, iterating and/or writing to a unique directory.
>>
>> Cheers, Hannes
>>
>> Am 18.12.21 um 18:51 schrieb Wouter Impens:
>>
>> Dear list,
>>
>>
>>
>> When using the ‘maps printer’ plugin for a bunch of atlas layouts, the
>> atlas pages are constantly overwritten by the next page, so I end up with
>> only the last page in the atlas layout.
>>
>> I used this before and it was working perfectly.
>>
>> I also tried with the following script:
>>
>>
>>
>> import qgis.core
>>
>> layouts_list = QgsProject.instance().layoutManager().printLayouts()
>>
>> for layout in layouts_list:
>>
>> QgsLayoutExporter.exportToPdfs(layout.atlas(),
>>
>>
>> 
>> 'C:\\Users\\d08909\\Documents\\01_WERKMAP\\03_EXPORT\\',
>>
>> QgsLayoutExporter.PdfExportSettings())
>>
>>
>>
>> But it’s giving me the same result.
>>
>>
>>
>> Manually exporting the altlas layouts one by one is no problem.
>>
>>
>>
>> I’m using QGIS 3.16.14 on windows.
>>
>>
>>
>> Any help is apreciated!
>>
>>
>>
>> Kind regards,
>>
>> Wouter Impens
>>
>>
>>
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Re: [Qgis-user] Bulk export atlas not working

[Wouter Impens]

Hi Hannes,

Thanks for your answer.
The names are unique. But the problem is not that one atlas layout is
overwriting another, they're overwriting themselves. Ik only get the last
page of each atlas.
While the atlas is exporting, I can see in the windows explorer that a file
is made and then reset to 0, only the last atlas page is kept.

Greetings
Wouter

Op ma 20 dec. 2021 om 09:28 schreef Johannes Kröger (WhereGroup) <
johannes.kroe...@wheregroup.com>:

> Hey Wouter,
>
> what is the atlas' expression for the filenames? Make sure they are
> unique, iterating and/or writing to a unique directory.
>
> Cheers, Hannes
>
> Am 18.12.21 um 18:51 schrieb Wouter Impens:
>
> Dear list,
>
>
>
> When using the ‘maps printer’ plugin for a bunch of atlas layouts, the
> atlas pages are constantly overwritten by the next page, so I end up with
> only the last page in the atlas layout.
>
> I used this before and it was working perfectly.
>
> I also tried with the following script:
>
>
>
> import qgis.core
>
> layouts_list = QgsProject.instance().layoutManager().printLayouts()
>
> for layout in layouts_list:
>
> QgsLayoutExporter.exportToPdfs(layout.atlas(),
>
>
> 
> 'C:\\Users\\d08909\\Documents\\01_WERKMAP\\03_EXPORT\\',
>
> QgsLayoutExporter.PdfExportSettings())
>
>
>
> But it’s giving me the same result.
>
>
>
> Manually exporting the altlas layouts one by one is no problem.
>
>
>
> I’m using QGIS 3.16.14 on windows.
>
>
>
> Any help is apreciated!
>
>
>
> Kind regards,
>
> Wouter Impens
>
>
>
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[Qgis-user] Bulk export atlas not working

[Wouter Impens]

Dear list,



When using the ‘maps printer’ plugin for a bunch of atlas layouts, the
atlas pages are constantly overwritten by the next page, so I end up with
only the last page in the atlas layout.

I used this before and it was working perfectly.

I also tried with the following script:



import qgis.core

layouts_list = QgsProject.instance().layoutManager().printLayouts()

for layout in layouts_list:

QgsLayoutExporter.exportToPdfs(layout.atlas(),


'C:\\Users\\d08909\\Documents\\01_WERKMAP\\03_EXPORT\\',

QgsLayoutExporter.PdfExportSettings())



But it’s giving me the same result.



Manually exporting the altlas layouts one by one is no problem.



I’m using QGIS 3.16.14 on windows.



Any help is apreciated!



Kind regards,

Wouter Impens
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Re: [Qgis-user] Query_for automatic building extraction from High Resolution Satellite Image

[Wouter Impens]

Hi Shrawan,

You could have a look at the 'orfeo toolbox' QGIS interface — Orfeo ToolBox
7.4.0 documentation (orfeo-toolbox.org)

The toolbox offers some model training for automated classification

Greetings
Wouter

Op ma 4 okt. 2021 om 13:07 schreef shrawan tripathi <
shrawantripathi1...@gmail.com>:

> Hi All,
> I have to digitize the building footprint/parcels from satellite Image @
> 50 cm resolution Satellite Image, can anyone please suggest me the tool for
> automatic extraction of same in QGIS. It would be great help for me.
>
> --
> Warm regards
> Shrawan Kumar Tripathi
> GIS Consultant
>
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[Qgis-user] couldn't load plugin 'processing' after update to 'Zurich'

[Wouter Impens]

Hi List,

After updating there seems to be a problem loading the processing toolbox,
Ik get this error message:

Couldn't load plugin 'processing' due to an error when calling its
classFactory() method
ModuleNotFoundError: No module named 'yaml'

Traceback (most recent call last):
  File "C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 335, in _startPlugin
plugins[packageName] = package.classFactory(iface)
  File "C:/OSGEO4~1/apps/qgis/./python/plugins\processing\__init__.py",
line 50, in classFactory
from processing.ProcessingPlugin import ProcessingPlugin
  File "C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 798, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
  File "C:/OSGEO4~1/apps/qgis/./python/plugins\processing\ProcessingPlugin.py",
line 47, in
from processing.gui.HistoryDialog import HistoryDialog
  File "C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 798, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
  File "C:/OSGEO4~1/apps/qgis/./python/plugins\processing\gui\HistoryDialog.py",
line 33, in
from processing.gui import TestTools
  File "C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 798, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
  File "C:/OSGEO4~1/apps/qgis/./python/plugins\processing\gui\TestTools.py",
line 27, in
import yaml
  File "C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 798, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
ModuleNotFoundError: No module named 'yaml'


Python version: 3.9.0 (tags/v3.9.0:9cf6752, Oct  5 2020, 15:34:40) [MSC
v.1927 64 bit (AMD64)]
QGIS version: 3.18.0-Zürich Zürich, bdef9fb3
Python Path:

   - C:/OSGEO4~1/apps/qgis/./python
   - C:/Users/d08909/AppData/Roaming/QGIS/QGIS3\profiles\default/python
   -
   C:/Users/d08909/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins
   - C:/OSGEO4~1/apps/qgis/./python/plugins
   - C:\OSGeo4W64\bin\python39.zip
   - C:\OSGEO4~1\apps\Python39\DLLs
   - C:\OSGEO4~1\apps\Python39\lib
   - C:\OSGeo4W64\bin
   - C:\OSGEO4~1\apps\Python39
   - C:\OSGEO4~1\apps\Python39\lib\site-packages
   - C:\OSGEO4~1\apps\Python39\lib\site-packages\win32
   - C:\OSGEO4~1\apps\Python39\lib\site-packages\win32\lib
   - C:\OSGEO4~1\apps\Python39\lib\site-packages\Pythonwin
   - C:/Users/d08909/AppData/Roaming/QGIS/QGIS3\profiles\default/python
   -
   
C:\Users\d08909\AppData\Roaming\QGIS\QGIS3\profiles\default\python\plugins\kmltools\libs
   -
   
C:/Users/d08909/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\qgis2web
   -
   C:\Users\d08909\AppData\Roaming\QGIS\QGIS3\profiles\default\python\plugins
   - .

Ik updated using the osgeo4w-setup.exe
I'm using windows 10

Thanks!

Wouter Impens
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[Qgis-user] transformation problems

[Wouter Impens]

Dear list,

I 'm getting odd behavior concerning transformations in QGIS

When I add a layer I get the error message 'No transformation available
between x (CRS of the layer) and custom CRS'
But there is no custom CRS, it looks like QGIS adds an empty one (I can
find it in settings>transformations). But if I delete that one, it makes no
difference.
If I add a layer with another CRS than the first one (like OSM), I get the
error once again and the layer CRS is indeed not transformed and there's no
background OSM.

I'm using QGIS 3.16.3 on Ubuntu 20.04.1

Any help is appreciated!

Greetings
Wouter Impens
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Re: [Qgis-user] (no subject)

[Wouter Impens]

Hi Maria,

I recently started as a Linux newbie on Ubuntu 20.04 and I managed to 
install QGIS following the steps on 
https://www.qgis.org/nl/site/forusers/alldownloads.html#debian-ubuntu



Kind regards

Wouter


Op 18-06-2020 om 14:25 schreef Maria Fernanda Obando Picado:

Hi! Thanks for incluiding me.

I changed from Ubuntu 18.04 to Ubuntu 20.04, so I automaticly lost the 
qgis software. When I tryed to install it again, many troubles came 
out, like "qgis needs 'this' or 'this' but its not going to be 
install" or 'its going to install 'this' in stand of 'this'; "E: the 
package its not found" and also "you have broken packages". I tryed to 
erase old packages, tryed to clean caché, tryed commands like 
"autoremove", "autoclean", "sudo apt-get -f install' and i followed 
all the suggested steps from the qgis original tutorial but nothing 
worked!


Its there any other suggestions about how to install qgis? this 
vertion is actually working?  I even tryed to install qgis copying 
from the terminal to the repository both latest versions 
(https//:qgis.org/ubuntu  and 
https//:qgis.org/ubuntu-ltr )


Please, anything will help, i'm in the middle of my final work to get 
a master degree and i already lost 2 days trying to fix this. My plan 
B is just, get back to Ubuntu 18, but its possible that that doesnt 
work easily anyway.


Thanks for your atention!

Regards.

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Re: [Qgis-user] How to calculate surface volume from UAV DEM tif files in QGIS

[Wouter Impens]

Hi Sean,

In the GRASS toolbox you can find some tools to handle volumes.
I found this post:
https://gis.stackexchange.com/questions/168035/calculate-volume-over-sloped-ground-in-grass-gis

Hope it helps.

Greetings
Wouter


Op ma 8 jun. 2020 om 17:13 schreef Sean Hill :

> Is it possible to calculate surface volume from aerial photographs
> (orthomosaic maps in DEM tif file format) in QGIS?
>
> Everything I have found on the internet refers to using
> satellite images. I did find one article on generating surface
> volume from drone imagery but is difficult to understand as it is
> missing some steps and/or the steps aren't clear and do not render the
> same results from step to step even though I follow the steps to the
> letter.
>
> Please help
>
> Sean
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Re: [Qgis-user] How to shorten this in Field Calculator

[Wouter Impens]

Hi Willem,

You could calculate this using a python script.

If you like, I could send you some code examples how to make a new field,
use expressions, etc. in python.


Greetings
Wouter Impens

Op wo 28 aug. 2019 om 13:58 schreef Willem Korevaar :

> I would like to shorten the following proces (= workaround)  of
> calculating a simple  Rs (Spearman Rank correlation) in the Field
> Calculator .
>
> https://drive.google.com/file/d/1vuW50nm1h4LduaAO01ThO6Nv-VXUGBo9/view?usp=sharing
>
> [image: image.png]
> and as an example:
>
> [image: image.png]
>
> Its about two columnsin the table  (X-Y in the example )  : P_00_14_JR
> (age 0-14 in %) and  P-N_W_AL (people from outside W-Europe in %).
> I know that it can be done with an R- script, but as I m working with
> students and I want to show them how the formula works and R is not working
> anymore on the schoolsystem I tried a workaround. It works, but there are
> too many steps.
> My workaround is in 2.18.9 :
>
>
>1. using the plugin Sort and number and ranking both columns. So two
>more fields : r_014 and r_nw (rang x and y)
>2. make kolom 6 ((x-y)2) using Field Calculator:
>(  "r_0-14"   - "r_nw_ll"   ) ^ 2
>3. create new field in FC named RS:
>1- (  ( 6 * (  sum( "kolom6"  ) ) / ( ( (count(  "BU_NAAM" ) ^ 2) * (
>count(  "BU_NAAM" ) ) ) - count( "BU_NAAM"  ) ) ) )
>In which 'BU_NAAM' = n (number of objects in this case names of
>neighbourhoods in Den Haag) but this one can be any other fieldname.
>New fieldname = RS and with 'Real' and precision 5
>4. in this case Rs = 0,488 which means a little correlation
>(I know that there should be no ties in the values, but that would
>make the proces more complicated in case of
>
> Is there a way in the FC I can do it in less steps?
> This is the link to the table used in QGIS and the Rs formula in the
> example:
>
> https://drive.google.com/file/d/1vuW50nm1h4LduaAO01ThO6Nv-VXUGBo9/view?usp=sharing
> I hope this all wil make sense :-)
>
>
> Gr
> Willem Korevaar
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Re: [Qgis-user] How to change raster values from another raster

[Wouter Impens]

Hi Vivien,

The tool ''r.patch'' should do the trick. More info on
https://grass.osgeo.org/grass76/manuals/r.patch.html

Greetings
Wouter


Op wo 10 apr. 2019 om 11:55 schreef vivien@hotmail.fr <
vivien@hotmail.fr>:

> Hello everyone,
>
> I'm going to introduce myself quickly. I'm a french researcher in Geology
> and I use a lot Qgis for my work. I don't know if it's the good forum to
> ask
> for support on Qgis so tell me if another forum is more appropriate.
>
> I have a DEM with a dame lake in the middle. I need to have the topography
> under the lake level so I built another DEM with the topography under the
> lake level. This new DEM has the same projection than the first one but not
> the same resolution.
>
> I want to change the elevation values of the fist DEM  using the values of
> the new DEM. I have already drawn a polygone of the area where I want
> change
> the values (the lake).
>
> How can I do this? Can I use a raster calculator?
>
> Thank you in advance for your answers.
>
>
> Vivien
>
>
>
> --
> Sent from: http://osgeo-org.1560.x6.nabble.com/QGIS-User-f4125267.html
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Re: [Qgis-user] problem in clipping

[Wouter Impens]

Hi Boaz,

You can use the processing tool 'repair geometry' to fix the geometry.

regards
Wouter

Op do 28 mrt. 2019 om 09:48 schreef Boaz Bar Ilan :

> im trying to clip and get this message
>
>
> Feature (6727) has invalid geometry. Please fix the geometry or change the
> Processing setting to the "Ignore invalid input features" option.
>
> Execution failed after 4.02 seconds
>
> im usinf 3.4 version
>
>
> can you help ?
>
> thanks
>
> boaz
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Re: [Qgis-user] QField: recommendations for aerial basemap preparation?

[Wouter Impens]

Hi Bernd,

It's possible to load a WMS layer in your project for Q-field, maybe that's
a solution?
But then of course you need an internet connection all the time...

Greetings
Wouter

Op zo 24 mrt. 2019 om 21:37 schreef Bernd Vogelgesang <
bernd.vogelges...@gmx.de>:

> Hi,
>
> I need an aerial basemap for my QField-project to be able to locate
> positions. As QField has not the ability to navigate to a point or
> indicate the direction of movement, provided only with a topographic
> basemap, I'm stumbling through the forest and have a hard time finding
> the positions.
>
> The project area is huge, around 400 square kilometers! I have a Mrsid
> file of the area of 1.6 GB with 20 centimeter resolution,
> transformed with gdal_translate to tiff is 42.5 GB,
> compressed with gdal_transform with jped-compression 50% 968 MB,
> resampled to 40cm resolution and 50% jpeg has 295 MB
>
> I used the QField sync plugin to generate a baselayer in gpgk-format
> from this ,which has 540 MB with 40 cm resolution.
>
> Unfortunately, on the tablet, the baselayer is loading so slow, that it
> is impossible to work with it. Each redraw takes around 10 seconds in
> the small scale, rising to infinity in higher scales.
>
> I wonder if there are other approaches recommendable, for example
> splitting the image into separate layers for bigger regions, which I
> could then turn on and off, or if I should prepare the image apart from
> using the plugins converter to gpkg.
>
> Due to the enourmous amount of time needed to process the image on the
> PC, a trial-and-error approach seems not to be feasable, so I ask you if
> someone can recommend an approach for such a huge beast.
>
>
> Thanx in advance,
>
> Bernd
>
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Re: [Qgis-user] pyQGIS - set attributes by expression

[Wouter Impens]

A very late thank you Nyall, but indeed this works. Maybe it can be added
to the PYGIS Cookbook documentation?

Cheers
Wouter

Op do 7 feb. 2019 om 08:08 schreef Nyall Dawson :

> On Wed, 6 Feb 2019 at 18:14, Wouter Impens 
> wrote:
> >> > I'm trying to iterate over the fields of a vector layer (using the
> index) and fill in the values by an expression
> >> >
> >> >  my_features = a_layer.getFeatures()
> >> > for a_feat in my_features:
> >> > mijn_index = a_feat.fieldNameIndex('perc_nr')
> >> > value = an_expr
>
> Change this to:
>
> my_features = a_layer.getFeatures()
> context = QgsExpressionContext()
> for a_feat in my_features:
> mijn_index = a_feat.fieldNameIndex('perc_nr')
> context.setFeature(a_feat)
> value = an_expr.evalute(context)
> ...
>
> Nyall
>
>
> >>
> >> What's "an_expr" here? Is it a QgsExpression object?
> >>
> >> Nyall
> >>
> >> >  a_feat.setAttribute(mijn_index, value)
> >> >
> >> > a_layer.commitChanges()
> >> >
> >> > I don't get an error but nothing is filled in. I evaluated the
> expression and it's true. It also works in the field calculator.
> >> >
> >> > Anyone an idea?
> >> >
> >> >
> >> > Kind regards
> >> > Wouter
> >> > ___
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> >> > Qgis-user@lists.osgeo.org
> >> > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> >> > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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Re: [Qgis-user] pyQGIS - set attributes by expression

[Wouter Impens]

Thanks for the help Nyall, but I still don't get any result.
I'll put the whole script here, maybe I'm doing something wrong on another
level (I'm rather new in coding):

from PyQt5.QtCore import *
from qgis.core import *

canvas = qgis.utils.iface.mapCanvas()
my_layers = canvas.layers()

for a_layer in my_layers:
a_layer.startEditing()
a_layer.addAttribute (QgsField('perc_nr', QVariant.String))
a_layer.commitChanges()

my_features = a_layer.getFeatures()
an_expr = QgsExpression('''to_string(  to_int( substr(  "CAPAKEY" , 7,
4)))+' ' +  CASE WHEN substr(  "CAPAKEY" , 14, 1) = '_'  THEN '' else
lower(substr(  "CAPAKEY" , 14, 1)) END + ' ' +  CASE WHEN to_int( substr(
"CAPAKEY" , 15, 3)) = '0'  THEN ''  else  to_string(  to_int( substr(
"CAPAKEY" , 15, 3)))  END  + ' ' +  CASE WHEN to_int( substr(  "CAPAKEY" ,
12, 2)) = '0'   THEN '' else '/' + to_string( to_int( substr(  "CAPAKEY" ,
12, 2))) END''')
context = QgsExpressionContext()
for a_feat in my_features:
my_index = a_feat.fieldNameIndex('perc_nr')
context.setFeature(a_feat)
value = an_expr.evaluate(context)
a_feat.setAttribute(my_index, value)

a_layer.commitChanges()

The first part - ading the attribute - works fine, but filling in the
fields don't give any result (nor an error either).
I'm working in QGIS 3.

Thanks!
Wouter


Op do 7 feb. 2019 om 08:08 schreef Nyall Dawson :

> On Wed, 6 Feb 2019 at 18:14, Wouter Impens 
> wrote:
> >> > I'm trying to iterate over the fields of a vector layer (using the
> index) and fill in the values by an expression
> >> >
> >> >  my_features = a_layer.getFeatures()
> >> > for a_feat in my_features:
> >> > mijn_index = a_feat.fieldNameIndex('perc_nr')
> >> > value = an_expr
>
> Change this to:
>
> my_features = a_layer.getFeatures()
> context = QgsExpressionContext()
> for a_feat in my_features:
> mijn_index = a_feat.fieldNameIndex('perc_nr')
> context.setFeature(a_feat)
> value = an_expr.evalute(context)
> ...
>
> Nyall
>
>
> >>
> >> What's "an_expr" here? Is it a QgsExpression object?
> >>
> >> Nyall
> >>
> >> >  a_feat.setAttribute(mijn_index, value)
> >> >
> >> > a_layer.commitChanges()
> >> >
> >> > I don't get an error but nothing is filled in. I evaluated the
> expression and it's true. It also works in the field calculator.
> >> >
> >> > Anyone an idea?
> >> >
> >> >
> >> > Kind regards
> >> > Wouter
> >> > ___
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> >> > Qgis-user@lists.osgeo.org
> >> > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> >> > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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Re: [Qgis-user] pyQGIS - set attributes by expression

[Wouter Impens]

Hi Nyall,

It is indeed a QgsExpression object. I 'm able to use it in the field
calculator so it should work...


Op di 5 feb. 2019 22:25 schreef Nyall Dawson :

> On Wed, 6 Feb 2019 at 00:37, Wouter Impens 
> wrote:
> >
> > Hi,
> >
> > Hope anyone can help me with this:
> >
> > I'm trying to iterate over the fields of a vector layer (using the
> index) and fill in the values by an expression
> >
> >  my_features = a_layer.getFeatures()
> > for a_feat in my_features:
> > mijn_index = a_feat.fieldNameIndex('perc_nr')
> > value = an_expr
>
> What's "an_expr" here? Is it a QgsExpression object?
>
> Nyall
>
> >  a_feat.setAttribute(mijn_index, value)
> >
> > a_layer.commitChanges()
> >
> > I don't get an error but nothing is filled in. I evaluated the
> expression and it's true. It also works in the field calculator.
> >
> > Anyone an idea?
> >
> >
> > Kind regards
> > Wouter
> > ___
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[Qgis-user] pyQGIS - set attributes by expression

[Wouter Impens]

Hi,

Hope anyone can help me with this:

I'm trying to iterate over the fields of a vector layer (using the index)
and fill in the values by an expression

 my_features = a_layer.getFeatures()
for a_feat in my_features:
mijn_index = a_feat.fieldNameIndex('perc_nr')
value = an_expr
 a_feat.setAttribute(mijn_index, value)

a_layer.commitChanges()

I don't get an error but nothing is filled in. I evaluated the expression
and it's true. It also works in the field calculator.

Anyone an idea?


Kind regards
Wouter
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Re: [Qgis-user] Vector Affine trouble

[Wouter Impens]

Hi Rutger,

I don't know if it's the most efficient way, but I would import the image
rather as a raster and use de Gdal georeferencer plugin to put it in the
right place.
Then you could use de raster to polygon tool to change into a shapefile.

Hope this helps
Kind regards

Wouter Impens

Op 12 jan. 2019 23:37 schreef "Rutger Emmelkamp" :

Hello everybody,

Hope someone can help me out this Saturday night (or Sunday or Monday) but
no hurry!

How to georeference an Illustrator vector image (contour line map) from a
specific area?
I have qgis 3.4.3 installed and qgisAffine and Vector Blender plugins don’t
work for this version.

I managed to turn the file into a .shp file and I see it somewhere off the
coast of Ghana (coordinates 0,0) but how do I drag it into place?
I think I’m looking for a Vector Affine Transformation plugin or menu but
can’t find it.

Hope someone can help me in the right direction.

Thanks and have a nice weekend.

Rutger
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