Book Image

QGIS Python Programming Cookbook, Second Edition - Second Edition

By : Joel Lawhead
Book Image

QGIS Python Programming Cookbook, Second Edition - Second Edition

By: Joel Lawhead

Overview of this book

QGIS is a desktop geographic information system that facilitates data viewing, editing, and analysis. Paired with the most efficient scripting language—Python, we can write effective scripts that extend the core functionality of QGIS. Based on version QGIS 2.18, this book will teach you how to write Python code that works with spatial data to automate geoprocessing tasks in QGIS. It will cover topics such as querying and editing vector data and using raster data. You will also learn to create, edit, and optimize a vector layer for faster queries, reproject a vector layer, reduce the number of vertices in a vector layer without losing critical data, and convert a raster to a vector. Following this, you will work through recipes that will help you compose static maps, create heavily customized maps, and add specialized labels and annotations. As well as this, we’ll also share a few tips and tricks based on different aspects of QGIS.
Table of Contents (16 chapters)
QGIS Python Programming Cookbook - Second Edition
About the Author
About the Reviewer
Customer Feedback


In this chapter, we'll programmatically create dynamic maps using Python to control every aspect of the QGIS map canvas. We'll learn to dynamically apply symbology from data in a CSV file. We'll also learn how to use some newer QGIS custom symbology, including font markers, arrow symbols, null symbols, and the powerful new 2.5D renderer for buildings. We'll use labels and map bookmarks. We'll learn the new way in which QGIS handles map services, which formerly required a plugin. We'll also go beyond the canvas to create custom map tools. You will see that every aspect of QGIS is up for grabs with Python, to write your own application. Sometimes, the PyQGIS API may not directly support your application goal, but there is nearly always a way to accomplish what you set out to do with QGIS.