QGIS Planet

Using Threads in PyQGIS3

While porting a plugin to QGIS3 I decided to also move all it’s threading infrastructure to QgsTasks. Here three possible variants to implement this. the first uses the static method QgsTask.fromFunction and is simpler to use. A great quick solution.

How to filter features in QGIS using the graphical processing modeler

This article describes a new algorithm for the processing modeler called feature filter algorithm. If you are already familiar with ETL concepts and the graphical modeler, you can directly jump to the section the feature filter algorithm. Building workflows for

Marco becomes QGIS.org Co-chair

We are very proud to announce that one of our founders and directors Marco Bernasocchi was elected as QGIS.org project steering committee (PSC) co-chair. With over 10 years of involvement with QGIS (he started working with QGIS 0.6) Marco will

Porting QGIS plugins to API v3 – Strategy and tools

The Release of QGIS 3.0 was a great success and with the first LTR (3.4) scheduled for release this fall, it is now the perfect time to port your plugins to the new API. QGIS 3.0 is the first major

PostgreSQL back end solution for quality assurance and data archive

Did you know that the possibilities to make a full QGIS back end solution for quality assurance and archiving in PostgreSQL are immense? SQL has it’s well known limitations, but with a little bit creativity you can make quite nice

PostgreSQL backend sollution for quality assurance and data archiving

Did you know that the possibilities to make a full QGIS backend solution for quality assurance and archiving in PostgreSQL are immense? SQL has it’s well known limitations, but with enough creativity you could create quite nice solutions just using

Interlis translation

Lately, I have been confronted with the need of translating Interlis files (from French to German) to use queries originally developed for German data. I decided to create an automated convertor for Interlis (version 1) Transfer Format files (.ITF) based

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Cours PyQGIS 13.11./14.11.2017 à Neuchâtel

Le cours est complet. Le cours est destiné aux utilisateurs avancés de QGIS qui souhaitent accroître leurs possibilités grâce à l’utilisation de python dans QGIS. Lors de cette formation, nous aborderons différentes possibilités d’interaction avec l’API QGIS ainsi que la

Best practices for writing Python QGIS Expression Functions

Recently there have been some questions and discussions about python based expression functions and how parameters like [crayon-5b363aa4b6ea7798770061-i/]  need to be used. So I thought I’d quickly write down how this works. There is some intelligence If the geometry or a

QGIS Expressions Engine: Performance boost

Expressions in QGIS are more and more widely used for all kinds of purposes. For example the recently introduced geometry generators allow drawing awesome effects with modified feature geometries on the fly. The last days at the QGIS developer meeting

QGIS2 compatibility plugin

Lately I’ve been spending time porting a bigger plugin from QGIS 2.8 to 3 while maintaining 2.8 compatibility. You can find it at https://github.com/opengisch/qgis2compat/ and http://plugins.qgis.org/plugins/qgis2compat/ One code to rule them all. My target was to have to edit the

Updating PyQt signals that use lambda in QGIS with 2to3

Just for the sake of documenting things, when running qgis 2to3 on a plugin I encountered a tricky situation regarding signals. [crayon-5b363aa4b95ea602594060/] The original code: [crayon-5b363aa4b95fb956711994/] The generated code: [crayon-5b363aa4b9601918024095/] so in do_load_project we get False instead of “my test

Using threads in QGIS python plugins

Here an example on how to work with threads in a consistent and clean manner in QGIS python plugins

QGIS: Qt5 and Python3 migration, current state

Behind the scenes a lot has happened to get ready for Qt5 and Python3. On the same codebase that is becoming the next release QGIS 2.16. This is really a great thing since we can focus work on a single

Prepare your plugins for QGIS 3

QGIS 3 is not yet there and there is still plenty of time to prepare and migrate. But I thought I would give some advice about things that you can keep in mind while working on your plugins to make

Increasing the stability of processing algorithms

Processing just got a new testing framework to improve the long-term stability of this important plugin. And you can help to improve it, even if you are not a software developer! This is yet another piece in our never-stopping crusade to

Geometry generator symbology

Say hello to geometry generators, a new way to use expression syntax to generate a geometry on the fly during the rendering process.
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QField Documentation

After getting QField up and running in Android 5, we felt it was time to start documenting how QField works, we started documenting how to install and use QField. We also added a section on how to handle your data

Passing android Intents to Qt

Working on QField I had the necessity of passing values from the QtActivity.java to the Qt cpp world, here how I did it using an Intent that is sent to the QtActivity (the one you should not edit that comes with

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