Book Image

Learn QGIS - Fourth Edition

By : Andrew Cutts, Anita Graser
Book Image

Learn QGIS - Fourth Edition

By: Andrew Cutts, Anita Graser

Overview of this book

QGIS 3.4 is the first LTR (long term release) of QGIS version 3. This is a giant leap forward for the project with tons of new features and impactful changes. Learn QGIS is fully updated for QGIS 3.4, covering its processing engine update, Python 3 de-facto coding environment, and the GeoPackage format. This book will help you get started on your QGIS journey, guiding you to develop your own processing pathway. You will explore the user interface, loading your data, editing, and then creating data. QGIS often surprises new users with its mapping capabilities; you will discover how easily you can style and create your first map. But that’s not all! In the final part of the book, you’ll learn about spatial analysis and the powerful tools in QGIS, and conclude by looking at Python processing options. By the end of the book, you will have become proficient in geospatial analysis using QGIS and Python.
Table of Contents (8 chapters)

Adding functionality using actions

If you need to add custom functionality to QGIS, then actions are the simplest way of achieving this. The different types of actions are listed as follows:

  • Generic actions: These start external processes. For example, you can run command-line applications such as ogr2ogr.
  • Python actions: These execute Python scripts.
  • Open actions: These open a file using your computer's configured default application; for example, your PDF viewing application for .pdf files or your browser for websites.
  • Operating system actions: These work like generic actions, but are restricted to the respective operating system you are running.

Configuring your first Python action

Open QGIS and load in the popp...