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

Chapter 5. Creating Dynamic Maps

In this chapter, we will cover the following recipes:

  • Accessing the map canvas

  • Changing the map units

  • Iterating over layers

  • Symbolizing a vector layer

  • Setting a transparent layer fill

  • Using a filled marker symbol

  • Rendering a single band raster using a color ramp algorithm

  • Setting a feature's color using a column in a CSV file

  • Creating a complex vector layer symbol

  • Using icons as vector layer symbols

  • Using an outline for font markers

  • Using the arrow symbol

  • Creating a graduated vector layer symbol

  • Creating a categorized vector layer symbol

  • Using live layer effects

  • Creating inverted polygon shapeburst fills

  • Creating a map bookmark

  • Navigating to a map bookmark

  • Setting scale-based visibility for a layer

  • Using SVG for layer symbols

  • Using pie charts for symbols

  • Using the 2.5D renderer

  • Using XYZ tiled map services

  • Using Esri ArcGIS map services

  • Labeling a feature

  • Using null symbols

  • Changing map layer transparency

  • Adding standard map tools to the canvas

  • Using a map tool to draw points on the...