Questions tagged [qgis-plugins]

Software plugins that add functionality to the QGIS package

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27 views

QGIS GUI not starting

Recently, I installed QGIS 3.10.14. I tried to start the application but QGIS would not start after the "setting up GUI" and "Starting Python". I also tried to uninstall QGIS and ...
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0answers
15 views

Drawing polygon around a raster (only where pixels have data) QGIS

I have a raster (grey scale image with white background [can change to e.g. green]). I want to make a polygon of the extent of the pixels with data (outline)- not the whole raster file. How can I do ...
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17 views

Enabling snapping on features created with PyQGIS

I have implemented a custom digitizing tool derivated from QgsMapToolDigitizeFeature class. Here is the code written to save the feature into the layer: layer.dataProvider().addFeatures([feature]) ...
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17 views

QGIS: Landover Analysis Dialog Box Too Small

When I open the Landcover Analysis plugin within QGIS, the information in the dialog box is overlapping and doesn't fit the window. Even if I increase the size of the dialog box. It makes it pretty ...
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1answer
32 views

Is there a plugin for calculating the walking time in QGIS 3

In the previous QGIS version there's this plugin: Walking time but it's not compatible with QGIS 3. Is there another plugin doing the same thing?
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12 views

Installing LecoS plug-in for QGIS v3.16 on Mac Big Sur

I am new to QGIS and was learning some spatial analysis. I have tried to install LecoS plug-in on QGIS v3.16, unsuccessfully. I have tried the All-in-one version, but when I install the plug-in I got ...
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1answer
37 views

Connecting Qt Designer GUI to python code in QGIS Plugin

I am creating a Plugin for QGIS 3.10 and have made a (big?) mistake. I started by creating the whole GUI in Qt Designer and the corresponding code in Qt Creator with C++. Now I have realized that I ...
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20 views

QGIS spline plugin tool cannot be imported

I'm using QGIS 3.10.14 and installed the spline plugin for digitizing curves. However, I get the error message below when I try and load the spline plugin. Traceback (most recent call last): File &...
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28 views

How can I control a custom parameter in QGIS WMS/WMTS/WFS webservices

GeoServer layers can be configured to be very flexible with parameters in at least these two ways: viewparams pass through to the SQL view (link) time/elevation/custom dimension (link and link) A ...
4
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1answer
68 views

Bivariate legend plugin throws NameError exception

While using QGIS 3.10 and 3.16 on Mac OS X Big Sur, the Bivariate legend plugin throws a NameError exception. How do I fix this or work around it? The following stack trace is from QGIS 3.10. The 3.16 ...
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1answer
18 views

Georeferencer Plugin: Installed but does not appear in raster menu (QGIS 10.3, Windows 10)

I see that others have had problems finding a rouge georeferencer window, or using the plugin. But when my student tries to use the confirmed installed georeferencer plugin in QGIS 3.10 on Windows 10 ...
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37 views

Strange “Exception Unknown” Error - Alternatives to OD matrix from QNEAT3? Possible graph failure with OSM data? [duplicate]

I have previously posted this but I've been running into a hard to understand problem using QGIS's QNEAT3 Plugin. I've contacted the creator of the plugin and he was unsure of the problem too. I'm ...
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33 views

Two Separate QGIS Plugins Under one Provider

I have developed a QGIS processing plugin that has a processing provider of its own. That plugin is working fine. Now I am developing a second plugin and I want to provide it the same provider so that ...
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1answer
54 views

Name of QGIS Plugin

What is the name of this QGIS Plugin?
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0answers
24 views

Returned non-zero exit status 2 gdal_merge.py in QGIS plugin

I'm trying to merge several files within a QGIS plugin via gdal_merge.py. In Anaconda distribution exactly the same code works as it is like that. I suppose Python in QGIS can't find gdal_merge.py. ...
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0answers
17 views

Coordinates problems when converting DXF to SHP

I had a DXF converted by a QGIS plugin called "AnotherDXF2Shape V0.9". When I overlayed the shapefile on Google Maps, the draw is not in the same position as it should have been. The ...
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25 views

Handling multiple QGIS Plugins in one custom menu

I want to create multiple plugins (for example 'Plugin_1', 'Plugin_2', etc.) which are independent of each other, but which are organized in one custom menu. For example 'MyMenu'. I am also aware of ...
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2answers
106 views

Conditional statements PyQGIS

I am looking for a simple example to create a conditional statement in the pyQGIS console. Today I wrote a simple script to add a field [CAT] to a vector layer. This script can be found below. I want ...
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0answers
16 views

Confusing QNEAT3 Exception: Unknown

When I try to run QNEAT3's "OD Matrix as Lines/CSV" function, I am getting a very strange error. Traceback (most recent call last): File "C:/Users/dicki/AppData/Roaming/QGIS/QGIS3\...
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1answer
13 views

QGIS 3.x Removing vector layers with geopackage source with PyQgis (win 32 error)

I'm aware that there are quite a few answers out there that have to do with removing datasources that are used to populate QGIS layers, but I feel like my question is slightly different in that it ...
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0answers
30 views

QGIS - Least Cost Analysis - Removing waterbodies

I'm new to least cost analysis. I have a DEM-layer of a region, an I also have created slope layer. The purpose is to calculate the least cost path between to ancient sites with QGIS. However, in the ...
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1answer
25 views

Python QGIS, attribute values are saved as NULL using actionAddFeature().trigger()

I am new using python in QGIS. I was trying to create a simple plugin in QGIS to create a new shapefile with a single attribute 'id', start the edition mode, and add new features manually on the ...
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0answers
60 views

Plugins in QGIS as an environmental impact assessment tools

Are there extensions in QGIS to carry out environmental impact assessments? Reviewing forums I have found the impact of transport mobility, visibility problems, etc. https://plugins.qgis.org/plugins/...
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21 views

Excel Sync Plugin in QGIS

I am trying to sync excel file with shapefile, I tried excel sync plugin but couldn't implement successfully. Could anyone tell how to use this plugin to sync shapefile with excel file.
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0answers
18 views

How to populate and add a new column in CSV file for QGIS Python plugins

I am trying to add a new column(field) in a CSV file and also populate the CSV file with the result of the multiplication between the 4th column(field) and 0.3048. my code copies everything in the CSV ...
1
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0answers
31 views

Unusual QGI3S “Exception: Unkowns”

I'm trying to process some OSM data extracted via Osmium. I've managed to process some of my smaller datasets, but as I've begun working on the bigger ones, I'm receiving some odd errors. Specifically,...
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1answer
35 views

Can the QGIS spatial index be used to evaluate points contained in multiple polygons of shapefile layers using PyQGis?

I want to use the spatial index of QGIS to improve the performance in the spatial query of multiple points in multiple polygons, both are shapefiles, but has not given me good results in execution ...
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0answers
17 views

How to make an instance of a GUI every time when click button

I create a custom plugin in QGIS 2 with Qt Designer. When I press button of the plugin I want to open a dialog with a table that has loaded data from the db. The problem is that I am confused on how ...
2
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0answers
23 views

How to dissolve overlapping distance isochrones

For my master's thesis I need to create distance isochrones (10/20/30/../100km) around certain coordinates. In my case they overlap and I want the overlapping parts to dissolve, but at the same time ...
2
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0answers
20 views

Check geometries distorting polygons when removing gaps

Using QGIS 3.10.9 with the check geometries plugin (v0.1), and I have a simple polygon layer as a test run with a deliberate gap. I use the check geometries plugin with the topology check 'check for ...
1
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1answer
35 views

How do I install a QGIS processing plugin headless for use with qgis_process?

I'm trying to use the UMEP for processing plugin in a docker container https://plugins.qgis.org/plugins/processing_umep/ After extracting the plugin zip to the plugins directory, it appears in the ...
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0answers
16 views

Geometry checker not removing overlap between features

I have a polygon shapefile layer (CRS EPSG:27700 British National Grid) that has a deliberate overlap and gap between features. When using the Geometry Checker Plugin (V0.1) in QGIS 3.10.9 I am ...
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1answer
28 views

How do I use my points to create Nearest Neighbors Clusters Map? [closed]

I have points which I am trying to analyse using visualist tools in QGIS and I am an encountering a common error ( see attached image ). How best can I rectify the problem? Tried several times to ...
3
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0answers
32 views

Is it safe to access layer object(e.g. QgsVectorLayer) in background task(QgsTask) in QGIS3

I was confused if it's safe for developers to access QgsVectorLayer in a background task(QgsTask), like reading data from layers? Because descriptions in PyQGIS cookbook are different with different ...
3
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1answer
27 views

Compute the number of shortest paths that use a link

I am currently computing shortest path algorithms between two sets of points (origin set and destination set) and a road network, using the plugin QNEAT3. It works and gives me the distances between ...
2
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0answers
62 views

Function that runs perfectly fine outside of QGIS keeps crashing QGIS (3.16) Python 3.7

I'm very new to QGIS, PyQt and even Python so I'm sorry if there is a very obvious mistake I am making, but I can seem to get one of my functions to run from within a plugin I'm writing for QGIS (3.16)...
3
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2answers
89 views

Why do I get gaps in the isochrones polygons with ORS tool in QGIS?

I am trying to represent isochrones from a points layer using ORS Tools in QGIS 3.8.3-Zanzibar. Does anyone know why there are some gaps in the resulting polygons, even though the road, according to ...
3
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1answer
38 views

Error when installing the “Minkowski fractal dimension calculator” Plugin in QGIS 3

I have tried to install the Minkowski fractal dimension calculator via the QGIS Plugin Repository, but got this error shown in the screenshot.
5
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1answer
78 views

Implementing French language in PyQGIS Plugin

I build a plugin with PyQGIS. If the user changes the language of QGIS interface then automatically my Plugin dialog and messages need to change that particular language (we just looking into French ...
0
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0answers
26 views

QGIS: Plug-in to determine optimal distance between coordinate and shape file [duplicate]

I have coordinates of power plants and I would like to determine their optimal distance (shortest distance) to electric grid lines (shape file). How could this be done in QGIS?
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1answer
24 views

Failing to load OS .gz files into QGIS 3.16 using OS Translator II

I'm new to QGIS and not strong on writing scripts or code. That said I've installed QGIS 3.16, PostGIS 3.1.0, PostgreSQL 13 and also OS Translator 2 and followed the configuration guidance at https://...
1
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1answer
42 views

Showing only selected features of vector layer in PyQGIS [closed]

I am developing a Plugin in QGIS and I want to show only selected parts of a layer. How can I handle this with PyQGIS?
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0answers
32 views

Why is QGIS (resource sharing plugin) telling me that R (3.4.4-1ubuntu1) is not installed?

This morning I went to install the R Processing scripts to my installation of QGIS3.12 (on linux Mint 19.3) and although the Resource Sharing plugin installs the resources required and the scripts ...
7
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3answers
202 views

Allocating point attributes as default values for line layer

I want to add points "ID" attribute as a default value for a line created between two points, for line layer fields "start_point" and "stop_point".
3
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0answers
41 views

Unable to install QGIS Plugins on Windows

I've installed QGIS 3.16 Hannover on my laptop about three days ago (Windows 10 Home 1909) and am unable to install any plugins, nor get access to any of the core plugins save four. When going to ...
2
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0answers
49 views

How to keep PyQt GUI alive while doing heavy calculation and updating Progress bar and logger

I have a GUI designed with PyQt, this GUI has a progress bar and a logger. when the user clicks the Run button the GUI/QGIS will become "No responding" the actions normally take 45minutes to ...
5
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1answer
127 views

PyQGIS: New vector created inside group instead of TOC

def newPolygonVector(self): vlt = QgsVectorLayer("Polygon?crs=EPSG:32647", "", "memory") vlt.dataProvider().addAttributes([QgsField("id", QVariant.Int)])...
14
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0answers
204 views

Unit testing for QGIS 3 plugins

There is a nice resource on unit testing for QGIS. There is also a post on this, Writing automated tests for QGIS plugins, which requires the use of docker and relies on QGIS 2 plugin - QGIS Tester. ...
2
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1answer
54 views

Visualize polyline n-to-n relations in QGIS using PyQGIS

I have 2 traffic networks (A and B) with links relating to each other. Each link has an id. E.g. link 1 of network A can have a relation to 3 links of network B. Link 2 of network A might also have a ...
1
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0answers
47 views

Changing the Processing plugin icon - QGIS

I have built a processing plugin which shows up in the QGIS Processing Toolbox. However, I am struggling trying to change the icon. Usually I do: pyrcc5 -o resources.py resources.qrc and it updates ...

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