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

Animating a layer

QGIS increasingly supports cartographic visualizations that go beyond GIS analysis. Many of these visualizations are provided by plugins, such as the animation feature of the mmqgis plugin. You can animate lines and points to bring your thematic map to life. In this example, we'll animate hub lines generated from the nearest neighbor analysis of UFO sightings in major cities. This data is the output from the Chapter 8, QGIS WorkflowsPerforming nearest neighbor analysis recipe.

Getting ready

You will need to make sure you have the mmqgis plugin installed via the QGIS plugin manager. Once installed, the plugin will show up as its own menu.

Unzip the following two zipped datasets and extract them to a directory named ufo in your qgis_data directory:

You can download the second dataset here:

You will need to create a directory named video in the...