All Questions
7,900 questions
4
votes
1
answer
177
views
Adding XYZ button to QGIS Manage Layers Toolbars
QGIS manage Layers toolbar offers a quick shortcut to the "data source manager". For instance, clicking on the "add raster layer" button brings me immediately to the proper tab of ...
- 546
0
votes
1
answer
69
views
Copy layer group from one project to another with PyQGIS
Using QGIS 3.8, is there anyway to copy a layer group (and its subgroups) from project1.qgz to project2.qgz? I'm trying to write an script that adds a layer group (with several layers and group layers ...
- 81
-1
votes
2
answers
95
views
Generating two points between two existing points using PyQGIS [closed]
I have the following problem: I have two points and I need a script to create two new points that are contained between the existing points and that the 4 points are collinear. I will add two images ...
- 199
1
vote
1
answer
70
views
Getting bounding box for scratch layer source using PyQGIS
I drew a New Temporary Scratch Layer, named New Scratch Layer, in QGIS. Both layer and project CRS are EPSG:3857. I am trying to compute its bounding box using PyQGIS. I use the following script:
[...
- 2,690
1
vote
2
answers
75
views
How to group actions on a custom QGIS toolbar
I've written a custom plugin for QGIS that has several actions. I can add them separately to my custom toolbar but as the plugin grows I'd like to group several of them together in a dropdown that ...
- 673
0
votes
3
answers
175
views
GeoPandas dataframe to JSON gives type error: Object of type QVariant is not JSON serializable
I'm creating a plugin and within the code I have a GeoPandas geodateframe created from a QGIS Vector layer which I need to reformat back into a QGIS vector layer. To create a vector layer from a ...
- 1,853
2
votes
1
answer
100
views
QGIS-Plugin: How to re-integrate QDialogButtonBox after deleting the buttons?
I'm writing a plugin for QGIS and created the basic-code according to this: https://www.qgistutorials.com/en/docs/3/building_a_python_plugin.html, so the base code is like this: https://github.com/g-...
- 1,853
0
votes
1
answer
122
views
Creation of QGIS Plugin: How to add comboboxes interactively
I am creating a QGIS Plugin, in which the user can rename columns to specfied names depending on a certain policy.
In the image you can see, that the user selects a layer in QGIS which field names ...
- 1,853
0
votes
1
answer
28
views
Programmatically enable/Disable a plugin repository
I'd like to enable or disable a repository from the plugin repository with pyqgis.
Exactly like when you're clicking on this checkbox in the plugin manager interface :
I only find a way to remove a ...
- 1,657
0
votes
0
answers
51
views
Python script problem with Qvariant
I have a problem with a pygis script.
This is a script to load in a shapefile layer from a WFS source and to add 4 extra fields to the attributes: Label, Legende1, Legende2 and PercId. In one of the ...
- 107
1
vote
1
answer
67
views
Getting value of "Editable" checkbox in layer fields widget settings with Python?
I have been trying to find a way to check the editability state of fields within a layer in QGIS 3.34 with no luck. I've tried using QgsVectorLayerUtils calls of fieldIsReadOnly, fieldIsEditable, and ...
- 13
2
votes
1
answer
127
views
How to filter only active layers in QgsMapLayerComboBox
I'm filtering the layers in a QgsMapLayerComboBox and in addition to filtering according to geometry, I want to remove the layers that are disabled? Is it possible? How do I do it? I'm using the ...
- 199
0
votes
0
answers
68
views
Recalling a MainWindow from an other script on PyQGIS console
I'm writing some scripts on Python console in QGIS. I have been stuck since a lot of time because I'm not able to recall a MainWindow class object from an other script. I've created a main menu with ...
3
votes
1
answer
76
views
Layer Feature Id Number
I have a short Python action that creates a new shape file for any feature that you click on in the layer. That part all works fine. When you zoom out it will select multiple feature and give you a ...
- 363
2
votes
1
answer
73
views
Plotting circle by center and radius in QGIS Python Console
Using QGIS's Python Console, I would like to be able to specify a coordinate in a given projection and draw a regular n-gon of a specific size centered on that point.
I can achieve the above if the ...
- 2,690
1
vote
0
answers
38
views
Using pyrcc5 when OSGeo4W is not installed on C:
I am writing a plugin from QGIS that I started up using plugin builder. On a previous system my OSGeo4W was on my C: and I also had an older version of QGIS (v3.26), and I generated the resource files ...
0
votes
0
answers
37
views
Customize QgsAttributeDialog
I would like to customize the QgsAttributeDialog. I need the driving attribute to be not a textBox but a ComboBox.
Is it possible to do this?
- 49
2
votes
1
answer
75
views
"Couldn't load PyQGIS" when launching QGIS with Anaconda
I'm trying to install QGIS in a new environment on Anaconda.
Here is the command I used:
conda install -c conda-forge qgis
But it seems like Python couldn't work with this QGIS here when I launch ...
- 21
1
vote
0
answers
92
views
Transfering features and its fields a layer to another in QGIS using Python
I created my own plugin to copy and paste layers in QGIS. All functions and code are working fine, but when I select 'Copy All Fields' and then try to copy and paste the selected field, QGIS crashes ...
- 49
2
votes
1
answer
96
views
Adding attribute values to existing GeoPackage with PyQGIS
I have an existing GeoPackage and want to copy Features from another layer to this one using PyQGIS and execute it inside a QGIS Macro. For that, I have the following code:
from qgis.core import ...
- 55
6
votes
1
answer
96
views
Chaging default path for saving output layouts in QGIS
We work on a large number of projects and the file structure is normally the same so repeatedly browsing for the right location to save plans has issues. I would like to be able to change the default ...
- 2,002
2
votes
1
answer
108
views
Position labels dynamically based on their point feature values
In QGIS I go to the layer properties and in the labels/positioning section in the 'Offset X, Y' field I click on 'Defined data overwrite' and enter the following expression:
'array("...
- 61
2
votes
1
answer
84
views
Modify vertex for polygon in QGIS Python script
For a given polygon, I'd like to modify the vertex, some of them should be deleted and some of them should be updated with new coordinates. And I know exactly the index for the related vertex.
The ...
- 803
0
votes
2
answers
40
views
PyQgis: filledMarkerSymbolLayer data defined properties not transferred to marker symbol
No pressing need here - I am mostly trying to determine what symbology can and can't
be modified in PyQgis as opposed to the QGis GUI. In this particular case, filled
marker symbols.
Qgs....
0
votes
0
answers
35
views
QGIS Python Script for loading MS-Server Tables and create relates and Attribute Form Widgets
I have the following Python script for QGIS3, which is supposed to load spatial
and non-spatial tables into a new project. Relationships are then to be set and
certain links are to be created in the ...
- 17
2
votes
1
answer
73
views
Setting extent for screenshot via PyQGIS
I am trying to figure out how I can set the extent of the rendered image because with QgsMapSettings().setExtent it doesn't work for me.
How can I set the extent as big as the biggest active vector ...
- 21
0
votes
0
answers
44
views
Ignore the same exception multiple times and continue with code
I'm currently working on a Python 3.12.3 plugin for QGIS 3.36.2 that adds two toolbars and a layer at different stages of its code. In unload I want to remove all of them with e.g.:
self.toolbar....
- 291
2
votes
0
answers
83
views
Filtering Projected coordinate reference systems in select CRS dialog box with PyQGIS
I am writing a PyQGIS script, where for the select CRS dialog box, I only want to show the projected coordinate Systems.
Is there a way to make such a choice inside the parameter definition as ...
- 21
0
votes
0
answers
64
views
QGIS/Lizmap : Custom filter on inherited layer
I just started a new job and I get to work with Lizmap to create custom maps for each French region. To achieve this I would like to use the parent/child feature from Lizmap to create a parent project ...
- 1
1
vote
0
answers
70
views
Iterating through layers contained in GeoPackage with the same SubsetString using PyQGIS
I want to iterate through layers contained in a GeoPackage using PyQGIS and select features based on attributes.
I use the same method on two layers in the same GeoPackage. The first correctly filters ...
- 69
1
vote
1
answer
61
views
Trigger Python code with "Navigate to next feature" button on QGIS
I am creating a script in the Action feature of QGIS that plots the values of an attributed table in matplotlib when I click on a feature in a layer as shown below.
class ClickTool(QgsMapToolIdentify):...
- 468
1
vote
1
answer
101
views
Making Python script originally produced with QGIS Modeler work on QGIS console
I'm writing some scripts on QGIS Python console, and I would like to implement some dialog windows, as those about the parameters' insertment, converting from the result of model builder, but when I ...
2
votes
1
answer
100
views
"TypeError: unsupported operand type(s) for /: 'QVariant' and 'int'" when automatically updating with PyQGIS
Using the Python Console I would like to update multiple columns at once that run the same function. I have a list of column names and a function, there is a for loop that should iterate through the ...
- 495
1
vote
1
answer
102
views
Asking user to select any features in QGIS
I would be like writing a script on the PyQGIS console, that, at the beginning, stops itself and asks the user to select some features of a layer. I mean a window dialog which asks the user to select ...
0
votes
2
answers
49
views
QGIS not finding all layers?
I'm having an issue with QGIS not identifying all layers correctly.
In my project, I have a group named "Mapas" with the following structure:
Layers inside "Mapas":
localizacao_pl
...
- 11
0
votes
0
answers
45
views
What are the properties creating a new QgsSimpleFillSymbolLayer?
I would be create a new QgsSimpleFillSymbolLayer, setting also the shape of symbol. At the moment, I set just the color and the outline.
layer_style = {}
layer_style['color'] = '%d, %d, %d' % (...
0
votes
0
answers
44
views
How to handle dynamically created buttons and their functionality at QGIS Plug-ins
I am making my first plug-in and I created a plug in with the plug-in builder. As far as I understand, and please correct me if I am wrong, the plug_in_dialog.py script should handle all the dialog ...
- 11
3
votes
1
answer
98
views
Symbology display issues in raster layers
The code below aims to apply symbology based on NDVI values to the selected raster layer. However, after running the script it does not display correct information (image 1). I need to access layer ...
- 797
2
votes
1
answer
86
views
Changing frame styles of annotation with PyQGIS, e.g. setting the transparency to 0 %
With PyQGIS I want to create an Annotation, for each feature in a Layer.
For that I wrote this script (with the help from Programmatically adding annotations and changing some points):
from PyQt5....
- 325
1
vote
2
answers
155
views
Easiest way for non-programmers to add my script to QGIS
QGIS 3.36.2, Python 3.12.3
I've got a script (about 500 lines of code) that I add to my project and test with the "Open Existing Script" button of the Processing Toolbar (it's not formatted ...
- 291
0
votes
0
answers
50
views
How to render the features in according with a specific attribute
I'm writing a script on PyQGIS. My goal is to render the features of two layers in according with attribute "NId" that is the same for both layers "terrFiltrati" and "...
0
votes
0
answers
55
views
Calculating of point stationing along axis in QGIS
I have this issue in QGIS: I need to calculate the stationing of start- and endpoints from line features (cable management system) alongside an axis (railway). The stationing should run along the axis ...
- 23
0
votes
1
answer
61
views
QGIS plugin upload error: There were errors reading plugin package (please check also your plugin's metadata). Cannot find LICENSE in the plugin
My metadata text includes license=https://www.gnu.org/licenses/gpl-3.0.html and I have also included a license.txt file with the text of the license in the link above but still getting this error ...
- 353
0
votes
1
answer
51
views
QGIS 3 Python script don't iterate through raster layers in print composer and saves only one raster layer with different years
I use QGIS3 and I have project with series of heatmap raster layers from different years (Grass_Snake_2005-2024, one raster layer for each year), in this project I set up already map in map Print ...
- 101
0
votes
1
answer
47
views
QGIS crashes when I set the labels
I'm writing a script for QGIS, using the Python console. I noticed that when the script processes the rows about the label settings, when I delete the layer "terrFiltrati", QGIS crashes and ...
3
votes
1
answer
85
views
Getting signal on layer scale based visibility changed in PyQGIS
Is it possible, to get a signal, when something (user or script) changes layer scale visibility?
I tried
layer.configChanged.connect(self.test_2)
layer.flagsChanged.connect(self.test_2)
layer....
- 299
0
votes
0
answers
56
views
QGIS crashes when the script runs
I'm writing a script on PyQGIS, but when I start it, this always crashes and I don't understand the reason.
After a lot of attempts, I undersand the problems are the following rows of code:
QgsProject....
0
votes
1
answer
57
views
Running script converted from PyQtDesigner on PyQGIS
I converted a .ui file of a project built on PyQtDesigner into a file .py. In an external IDE, the code works and the dialog window shows, while on the Python console in Qgis doesn't work. Here is the ...
0
votes
2
answers
91
views
How to import other scripts in the same folder?
I'm writing a PyQGIS script and I would import in my script other external scripts. I tried in this way but the code doesn't work.
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import ...
3
votes
1
answer
75
views
"Enable" custom icon to give it QGIS' default white border
QGIS 3.36.2, Python 3.12.3
If you hover over an icon of the default toolbars in QGIS (e.g. the Toolbox), then that icon gets a light grey background and a black border (leftmost) until you move your ...
- 291