Questions tagged [qgis-3]
for questions specific to the 3.x series of QGIS.
4,417
questions
4
votes
1
answer
91
views
Getting list of intersecting layers into a field in a polygon table
I have a polygon layer with many other layers (different geometry but no points) in a map and I'd like to return the actual layer names where any object intersects with my polygons into a comma ...
0
votes
0
answers
10
views
Imported CSV files from Fieldmove and QGIS only displayed as lists?
Downloaded some .csv data for an assignment I need to do (from fieldmove specifically), and am trying to display a single point for which i downloaded said data as a csv. file. However, when i try to ...
1
vote
1
answer
34
views
In QGIS, a joined layer is not automatically set to edit mode, when edit mode of parent layer is switched on
I joined some fields of a different layer in QGIS (version 3.34.5) via layer properties, set them to editable and added them to the attribute form of the parent layer.
However, when I use the form ...
0
votes
0
answers
13
views
Version error on SAGA NextGen on QGIS and MacOS
I am trying to use SAGA NextGen on QGIS and when I try to run a program I get an error message saying that I need to update the SAGA binaries to 9.1. I am using QGIS 3.34 on MacOS.
Is there any way ...
1
vote
0
answers
44
views
Calling ST_IsValid on a QgsGeometry in PyQGIS, referencing PyQGIS object in SQL statement
I'd like to be able to verify the validity of a geometry of type QgsGeometry within PyQGIS.
From what I can understand, the steps are
Convert QgsGeometry to something that ST_IsValid will recognize.
...
0
votes
1
answer
23
views
Using PyQGIS to iterate through layers with custom layout
How do I select the layer and apply a layout for export to .PNG?
I use: QGIS 3.34 and the Python Console.
So the manual process is: select layer => go to Layout Manager => Select Layout => ...
0
votes
0
answers
62
views
Meaning of light-blue cross on map-canavas
What is the meaning of this light blue cross sign on the map canvas of QGIS?
I upgraded from 3.34 to 3.36 and now I see this cross sign, when opening a new blank project and also on some, but not all ...
3
votes
1
answer
456
views
I can't merge two vector layers due to their fid field
I have two vector point GeoJSON layers) showing supermarkets in 2 adjacent cities. I would like to combine them in one way or another (by merging them or adding the feature of one to the other). Their ...
1
vote
1
answer
40
views
Meaning of error message on QGIS start-up
On start up QGIS 3.36.1 on Windows 10 I get this weird error message:
2024-03-25T12:10:17 WARNING Traceback (most recent call last):
File "C:\Users/Kurt/AppData/Roaming/QGIS/...
0
votes
0
answers
15
views
I am calculating LST for Mumbai
I am calculating LST for Mumbai and I found that only Airport and Slum, Barrel land is having high LST than any other region. I need to analyze it more if its just showing all area cooler in city like ...
3
votes
1
answer
195
views
QGIS Attribute Form -> Value Relation -> Filter expression: expressions or functions to get the names of current layer and current field
Shortcut to the core question:
How to write a custom function to get the name of a field in an Attribute Form?
I would like to use it as a variable in a Filter expression of a field with a Value ...
3
votes
0
answers
348
views
K-shortest path between two points in QGIS
I am new to QGIS. I have a road network layer in QGIS. I can compute the shortest path between the two points over the road network layer via the Network Analysis toolbox in QGIS.
I am interested in ...
1
vote
0
answers
41
views
QGIS crashed when exporting from map layout
I am a self-taught QGIS user, and I am making a map of the nature preserve where I work. I was practically finished with the whole project when I ran into this problem. Every time I go to export the ...
3
votes
2
answers
503
views
Varying page size of maps within an Atlas in QGIS?
I would like to create an atlas of a series of maps covering a number of woodlands and to have them all at the same map scale.
This would work best visually if some of the maps were in landscape, and ...
1
vote
1
answer
22
views
Expression Builder using times
I have brought in vector layer from a .csv file containing Total Response Time for Emergency Services Incidents. While the times are in HH:MM:SS format I believe that having brought it in as a .csv ...
2
votes
0
answers
25
views
pyqgis - Show layer properties in layer name in a same way as feature count [closed]
Setting 'Show Feature Count' adds a number of features in layer's name, but doesn't actually change its name, in a sense that its name can still be got from the 'name()' method and the result would ...
4
votes
2
answers
2k
views
How to open Cesium 3D tiles with QGIS 3
How to open Cesium 3D Tiles with Qgis
The format is not available but this is an OGC standard:
https://www.ogc.org/standards/3DTiles
GeoPackage seems to be working on adding the extension:
https://...
0
votes
0
answers
24
views
QGIS Export ESRI File Geodatabase versus ESRI FileGDB
Ive just noticed in QGIS (v3.28.11) that on the "Save Vector Layer As" format options, that there are two ESRI File Geodatabase options.
One is called
ESRI File Geodatabase
The other is ...
6
votes
1
answer
930
views
Backup QGIS (3.2.1) layer to independent PostGIS table?
I'd like to make multiple, progressive backup copies of QGIS (3.2.1) layers that are stored in PostGIS tables. I've tried multiple routes to export them as files on disk, but they all seem to destroy ...
3
votes
1
answer
525
views
qgis-bin.exe is not responding at startup
Whenever I open up qgis, it always does this:
I'm really new to this, so please bear with me:
I tried a whole lot of things, I uninstalled and reinstalled almost 10 times, and I'm starting to get ...
2
votes
1
answer
720
views
QGIS3 application not there after installing
I installed QGIS3 on my computer at work. The installation was completed without errors. But there is no QGIS application on the computer. The folder exists though, and it also contains all the other ...
0
votes
1
answer
60
views
Node information in a PostGIS dataset
I am working in QGIS / PostGIS to plan the cable layout for a seismic array. The power distribution is from the green point with the white cross in the middle. The nine green points marked with a ...
3
votes
3
answers
1k
views
Change Output name in Script - QGIS 3
I exported a model as script using the properly option in QGIS 3.8.
The Script works perfectly, but the output name is changed.
Heres a print of the model:
I want that the script´s output name, from ...
0
votes
1
answer
37
views
Retain QGIS window layout
Is it possible (in QGIS 3.16) to retain the layout of windows. So whenever I open the project it opens as below?
Critically the Attribute table in Form view with the Pan option on the RHS and a ...
4
votes
1
answer
235
views
Automatically installing plugins on QGIS, deploying QGIS plugins on an IT infrastructure
My company is preparing a default QGIS configuration file (qgis_global_settings.ini) for deploying on a great number of MS Windows workstations.
We have selected a few QGIS plugins we want to be ...
0
votes
2
answers
932
views
Red marker cross on canvas can't be hidden or deleted
I've somehow created an indelible red X on my map in QGIS. I can't select it, and switching off all the layers doesn't hide it. It doesn't show in the print layout. Its a constant screen size, eg mm.
...
0
votes
2
answers
547
views
Unable to upgrade QGIS from 3.14 to 3.16.5 or 3.18.1
I have run many versions of QGIS 2 and 3 on two Mac computers. I have not been able to get 3.16.5 (LTR) or 3.18.1 to work on either of them.
However, on a third computer which has never had QGIS ...
2
votes
1
answer
193
views
Disconnect between raster symbology in Layers Panel and Layer Properties (QGIS 3)
I'm working on a Python plugin for QGIS that applies a customised colorRampItemList to a single band raster. The result displays correctly on the map and in the Layers Panel but incorrectly in the ...
2
votes
1
answer
171
views
Showing multiple raster images on map QGIS 3.20
I am using multiple raster images that are all geo-referenced, have different icons and are part of a large mosaic. Although I have linked all of them on the attribute table and view each image, I ...
1
vote
1
answer
73
views
QGIS export layer relations from one project to another
I have a .qgz project with a spatial layer and two non-spatial layers, primarily created for data collection. All the three layers are saved in a single .gpkg file and the non-spatial layers are ...
2
votes
2
answers
2k
views
Accessing QGIS using Jupyter Notebook
Using Python for QGIS in a Jupyter Notebook, how can I automate the task of
importing a dxf file
getting a data web service as a layer ?
I have tried (https://lerryws.xyz/posts/Install-Jupyter-...
2
votes
1
answer
590
views
Browser Widget slows QGIS
I read a lot of speeding up the browser widget, but nothing seemed to help me.
As long i have it closed QGIS 3 is fast but if I open it all actions slows down.
My project is on a local ssd - fast dir ...
0
votes
0
answers
29
views
Limiting the shown area for a shapefile
I am new to QGIS so im not that experienced with the program. I want to create a GeoPackage with various WMS and shapefile information sources for a small area, but all my source files have displayed ...
2
votes
1
answer
803
views
Install QGIS 3.4 with GRASS support in Ubuntu 18.04
I can install QGIS3.X but cannot run a GRASS process. I get the popup:
This algorithm cannot be run :-(
GRASS 7 can't be found on this system from a shell. Please install it or configure your ...
6
votes
1
answer
257
views
Using Arabic labels in QGIS
In QGIS 3.30 I am trying to render labels in Arabic. When I turn on the labels, the Arabic text appears mirrored compared to how it is correctly written in the attribute table.
Does anyone have any ...
0
votes
0
answers
27
views
Supressing algorithms messages in custom processing algorithms log
I would like to provide clean feedback in processing algorithms log, but it is full of intermediate algorithms results, which are cryptic and needless for user:
Is there a way to suppress these ...
0
votes
1
answer
273
views
QGIS Options CRS setting error that cannot be changed
At some point, maybe after a QGIS update, my settings in the Options panel cannot be changed anymore.
Even before any Project is loaded, I have this error if I try to save in Options. Otherwise, I can ...
6
votes
2
answers
752
views
Added raster layers with PyQGIS do not show up
I have a list ("datList") with names of raster layers which I want to add. When I add raster layers in the Python Console everything works fine:
for da in datListe:
layerDir = "C:/[...
2
votes
2
answers
715
views
I am importing layers from a DWG file into QGIS, and they are visible in the "Layers" panel, but they are not visible in the layout
I am very new to QGIS. I have a DWG file containing vector layers and I am using Project>Import/Export>Import Layers from a DWG/DXF. Some layers are then visible in the map, but others are not. ...
3
votes
1
answer
225
views
QgsAttributeDialog in PyQGIS Standalone Application
I am trying to implement a desktop application with PyQGIS 3, I have not been able to program a layer info using the attribute dialog that the QGIS API.
This is part of the code that I use:
def info(...
1
vote
1
answer
505
views
Sphinx doc error "no module named 'qgis'" with QGIS python plugin
I try to generate my PyQGIS plugin documentation with Sphinx.
I made a python virtualenv based on QGIS environment and initiated my Sphinx doc with the package already installed in it.
But when I ...
1
vote
0
answers
20
views
"ERROR: Incomplete GRASS session: Variable 'LOCATION_NAME' not set" while running r.covar in QGIS
QGIS version: 3.34.3-Prizren
QGIS code revision: 47373234ac
Qt version: 5.15.3
Python version: 3.9.18
GDAL version: 3.8.3
GEOS version: 3.12.1-CAPI-1.18.1
PROJ version: Rel. 9.3.1, December 1st, 2023
...
1
vote
1
answer
764
views
Merge multiple raster .tif in QGIS 3.2?
I'm trying to merge 12 .tif raster layers (raster -> misc -> build virtual raster), but keep getting this error:
Loading resulting layers The following layers were not correctly
generated./var/...
0
votes
1
answer
27
views
I can't seem to overlay maps with a transparent background in the map layout like I used to
I have a workspace that I created maybe a year ago that was an evolution of a workspace I've used since before version 3, where I have 3 maps elements in a layout stacked in an overlay (to keep them ...
1
vote
1
answer
29
views
QgsVectorLayer not loading correctly
I'm working with PyQGIS and have encountered an issue. While my code successfully creates a new layer (as evident in the screenshot attached), this layer does not load correctly into the project. I'm ...
1
vote
1
answer
40
views
How to pass driver-specific options to QgsVectorFileWriter?
I would like to add layer to .gdb according to ( PyQGIS cookbook) example:
# Write to an ESRI GDB file
save_options = QgsVectorFileWriter.SaveVectorOptions()
save_options.driverName = "FileGDB&...
0
votes
1
answer
35
views
How to display an image in a UI custom form created with QtDesigner in QGIS 3.28
I created a custom form with QtDesigner. For the image in the form I used a QLabel and added the path of the picture to the "pixmap" attribute. The path is
C:\Users\Dennis\Desktop\Formulare\...
5
votes
1
answer
275
views
QGIS rule based symbology for rasters in Atlas?
I'm making species distribution maps and have got the Atlas working perfectly using a polygon layer to show the quarter degree grid cells for species observation records. I have ~ 250 species.
The ...
1
vote
2
answers
277
views
Install qgis-server-font-loader Plugin on QGIS 3.4.8 (Windows Server 2016)
I'm trying to install this plugin: https://github.com/avinet/qgis-server-font-loader.
First I copied the Zip-folder in C:\OSGeo4W64\apps\qgis-ltr\plugins
then I opened QGIS and installed the plugin ...
0
votes
1
answer
205
views
Importing cmap file in QGIS
I have a cmap file that I want to import in QGIS and use as the color ramp for my map layer. How do I do this?