Questions tagged [qgis-3]

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

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QGIS layout, print grid labels beside lines

I am using QGIS (v3.36.1) to make a map for planning purposes. For the layout, I am looking at a map made in some kind of CAD software. It has labels on the gridlines inside the border, which I can ...
MortenSickel's user avatar
  • 3,814
0 votes
0 answers
18 views

QGIS crash everytime post not saving new layer

I edited one layer but closed project without saving it. Now my project is opening but it crashes within 2 - 3 minutes' of opening. What all I can do to save my work?
Rahul Raj's user avatar
1 vote
0 answers
37 views

pyqgis calculate field using expression

EDIT: sample data can be downloaded here: https://github.com/jude9apple/sampleData I am using QGIS 3.36 and python 3 (in Pycharm) to run a script which read a table containing which processes apply to ...
Juliette Lapeyre's user avatar
1 vote
0 answers
36 views

WMS layer doesn't load using PyQGIS

I'm using the following code to load a WMS layer to QGIS : url = "https://data.geopf.fr/wms-r/wms?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&STYLES=normal&FORMAT=image/geotiff&...
aogino's user avatar
  • 11
0 votes
0 answers
12 views

Semi-Automatic Classification plugin error - QGIS - failed dependencies

I had been using SCP for the last year and just recently it stopped working. If I run any process that generates new images, those images are empty (all no data). I tested the dependencies and got: -...
Rodrigues's user avatar
  • 490
0 votes
0 answers
24 views

QGIS Issue: Empty Tables When Styling or Adding Features

When using QGIS, I encounter empty tables when attempting to style features or add polygons to layers. This happens consistently across different functions.
Iacobet Iulian's user avatar
0 votes
0 answers
35 views

How to clip satellite base map into polygons

I'm trying to create a model to detect trees within the boundary of a country in QGIS 3.34. So far, I'm using the Google Maps Satellite base map from QuickMapServices. I created a vector layer where I ...
Bartek's user avatar
  • 9
0 votes
0 answers
43 views

QGIS: How to speed up loading of relation in forms

In QGIS I have two layers: layer containing points (trees) that each have an specific ID table contains all survey data. Each survey also contains the specific ID of the tree I linked them via the ...
Alexander Halm's user avatar
-1 votes
1 answer
31 views

Moved QGIS 3.6 to new PC and now need to change Output folder and Scripts folder

I moved my old QGIS to a new PC. Installed from zero, and later just copied "C:\Users[User]\AppData\Roaming\QGIS\QGIS3\profiles". Everything works fine, when I open my old projects it's all ...
Filip Frankopan's user avatar
0 votes
0 answers
25 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 ...
That Rock Guy's user avatar
0 votes
0 answers
21 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 ...
ddomizia's user avatar
  • 648
1 vote
1 answer
39 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 ...
ENOTTY's user avatar
  • 111
1 vote
0 answers
46 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. ...
nr_aus's user avatar
  • 3,535
0 votes
0 answers
19 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 ...
kalpanapardeshi's user avatar
1 vote
1 answer
46 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/...
Kurt's user avatar
  • 7,097
4 votes
1 answer
101 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 ...
RBCMark's user avatar
  • 387
1 vote
0 answers
70 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 ...
Kurt's user avatar
  • 7,097
1 vote
1 answer
24 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 ...
Mark Leander's user avatar
1 vote
0 answers
43 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 ...
Madeline Cox's user avatar
2 votes
0 answers
26 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 ...
ViperMiniQ's user avatar
0 votes
0 answers
26 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 ...
nr_aus's user avatar
  • 3,535
0 votes
1 answer
30 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 => ...
Cerveser's user avatar
  • 101
0 votes
1 answer
38 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 ...
GeorgeC's user avatar
  • 8,228
0 votes
0 answers
31 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 ...
Student M's user avatar
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 ...
Kubson's user avatar
  • 614
1 vote
0 answers
23 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 ...
GiorgosK's user avatar
0 votes
1 answer
61 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 ...
MortenSickel's user avatar
  • 3,814
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 ...
willemite's user avatar
  • 118
1 vote
1 answer
30 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 ...
Diogo Barros's user avatar
0 votes
1 answer
38 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\...
Dennis's user avatar
  • 43
1 vote
1 answer
41 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&...
Kubson's user avatar
  • 614
0 votes
0 answers
35 views

Run specific Python script (created with Model Designer) when pushing a button in Qt Designer

Let me start by saying my Python knowledge is very, very limited. I created three models using the Model Designer in QGIS, and exported them as python scripts. Then I used the Plugin Builder and Qt ...
LaiaE's user avatar
  • 1
1 vote
0 answers
25 views

Is it possible to hide cartesian area from the 'derived information' of the identify features tool in QGIS?

I'd like to remove the cartesian area calculation in the derived information section of the identify features tool, since it sometimes confuses some colleagues to have two values there. Couldn't find ...
telcush's user avatar
  • 11
0 votes
1 answer
113 views

QGIS 3.34 core plugin SAGA GIS provider defect, missing metadata file (OSGeo4W)

I updated QGIS to the new version via OSGeo4W Setup. Everything worked fine, but when I check plugins, the sagaprovider core plugin shows an error message, that the plugin is defect and the metadata ...
Hollul's user avatar
  • 173
0 votes
0 answers
24 views

Implementing Centralized QGIS Plugin Distribution via Custom Repository

In our company, the use of QGIS plugins must be restricted. We would now like to implement the distribution of plugins centrally and no longer via the user profile. To do this, we have created our own ...
cc_schr_gis's user avatar
4 votes
2 answers
111 views

Why QGIS expression display double at concave sections?

I am trying to display the vertices of a polygon with vertex number. In symbology, I have used the Marker line and font marker. . When the Line offset is -5 positive the text 'P7' is displayed far ...
neogeomat's user avatar
  • 8,380
0 votes
0 answers
18 views

Region of Interest selection error in Semi-Automatic Classification Plugin (Error: unable to calculate)

Yesterday I upgraded the Semi-Automatic Classification Plugin. Immediately after doing this, the automatic ROI selection is giving me that error as shown in the attached image. I have tried to ...
Aim Banda's user avatar
1 vote
1 answer
43 views

Calculate default value for field not working in QField but working in QGIS

In QGIS (3.34.3) with an input form I'm assigning as the default value of a field of my buildings polygons the code (codice) from the polygon area to which it belongs, that is stored in another layer, ...
stefan0n's user avatar
  • 306
1 vote
0 answers
31 views

Using advanced digitizing tools over multiple layers in QGIS

I need to make movements in different layer polygons at the same time (I mainly use move feature and rotate feature tools). I've seen some posts explaining how to do this in multiple steps, but the ...
Mig TabSher's user avatar
2 votes
1 answer
48 views

How to update QGIS display from script run in console

Working from the Python console in QGIS, I am trying to create an 'animation' of sorts by selecting one line after another in a layer with parallel lines, with a pause on each line. I've started from ...
marcp's user avatar
  • 895
0 votes
0 answers
33 views

Click Functionality Not Working in QGIS Selection Tools

Yesterday, I was using the "select entities by area or single click" tool to select a group of polygons from a shapefile and then using the "change properties of a group of files" ...
Adam Lavoie's user avatar
0 votes
0 answers
53 views

Semi-Automatic Classification QGIS Plug-In Error When Running Maximum Likelihood Classifier

I have the following python error when trying to run the Maximum Likelihood classification in Semi-Automatic Classification plugin version 8.2.2 on QGIS 3.28.5. Python version is 3.9.5 File "C:\...
Sean Jarrett's user avatar
0 votes
0 answers
40 views

QGIS 3.28.5 can't open a project file

Do you know any solution? I think in similar cases I could unzip the .qgz file and then I was opening the .qgs file but I can't do it with this project. I saw other answers, the file is there for ...
Pitheas's user avatar
  • 741
0 votes
0 answers
31 views

Not achieving correct pixel width and height for map export in QGIS

Trying to export the full extent of a EPSG:4326 layer of the earth (-180, 180,-90,90) with an exact pixel width (8192) and height (4096). I can't seem to get the width/height correct. If I set the ...
AndrewS's user avatar
2 votes
1 answer
41 views

Adding geometry from first row of attribute table to all other rows of attribute table of layer using PyQGIS

I have a layer where only the first row in the attribute table has a geometry. I want to copy this geometry to all other rows of the attribute table of this layer but the geometry is still empty. ...
Robert B K's user avatar
0 votes
0 answers
29 views

How to generate CSV file for polygons to show in QGIS

My table looks like this: but adding this as a text defined layer hasn't got me anywhere as X and Y are not clearly defined. I am new to QGIS.
Hemproski's user avatar
2 votes
1 answer
70 views

How to hide or remove the subgroup labels on a QgsLayoutItemLegend with PyQGIS?

I'm trying to build a layout with pyqgis and I'm not able to hide or remove the label from the caption subgroup as shown in the image below. This is what I have until now: ... legend = ...
Francisco Camello's user avatar
0 votes
0 answers
25 views

How to automate the code to synchronization postgis live layer on pyqgis?

I possess a dataset stored on a PostGIS server and aim to establish a fundamental synchronization mechanism through code. Although I've implemented the provided code for this purpose, when utilizing ...
Nihar Sahoo's user avatar
0 votes
0 answers
17 views

QGIS 3.34 and nested GeoJSONs

Is there an issue with how QGIS 3.34 ingests GeoJSONs that were exported by Kili with nested attributes? { "type": "FeatureCollection", "features": [ { "type": &...
Karen Kowalewsky's user avatar
2 votes
1 answer
55 views

Change selection color to be just a polygon with no fill in QGIS 3

Can we change this to be no fill color but just a yellow outline? Currently stuck in v3.16 but I don't see this in the Dev version either.
GeorgeC's user avatar
  • 8,228

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