Questions tagged [qgis-3]

for questions specific to the 3.x series of QGIS.

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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?

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