Book Image

Learning QGIS - Third Edition

By : Anita Graser
Book Image

Learning QGIS - Third Edition

By: Anita Graser

Overview of this book

QGIS is a user-friendly open source geographic information system (GIS) that runs on Linux, Unix, Mac OS X, and Windows. The popularity of open source geographic information systems and QGIS in particular has been growing rapidly over the last few years. Learning QGIS Third Edition is a practical, hands-on guide updated for QGIS 2.14 that provides you with clear, step-by-step exercises to help you apply your GIS knowledge to QGIS. Through clear, practical exercises, this book will introduce you to working with QGIS quickly and painlessly. This book takes you from installing and configuring QGIS to handling spatial data to creating great maps. You will learn how to load and visualize existing spatial data and create data from scratch. You will get to know important plugins, perform common geoprocessing and spatial analysis tasks and automate them with Processing. We will cover how to achieve great cartographic output and print maps. Finally, you will learn how to extend QGIS using Python and even create your own plugin.
Table of Contents (13 chapters)
Learning QGIS Third Edition
About the Author
About the Reviewer


In this chapter, we covered the different ways to extend QGIS using actions and Python scripting. We started with different types of actions and then continued to the Python Console, which offers a direct, interactive way to interact with the QGIS Python API. We also used the editor that is part of the Python Console panel and provides a better way to work on longer scripts containing loops or even multiple class and function definitions. Next, we applied our knowledge of PyQGIS to develop custom tools for the Processing Toolbox. These tools profit from Processing's automatic GUI generation capabilities, and they can be used in Graphical modeler to create geopreocessing models. Last but not least, we developed a basic plugin based on a Plugin Builder template.

With this background knowledge, you can now start your own PyQGIS experiments. There are several web and print resources that you can use to learn more about QGIS Python scripting. For the updated QGIS API documentation, check...