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Building Mapping Applications with QGIS

You're reading from   Building Mapping Applications with QGIS Create your own sophisticated applications to analyze and display geospatial information using QGIS and Python

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Product type Paperback
Published in Dec 2014
Publisher Packt
ISBN-13 9781783984664
Length 264 pages
Edition 1st Edition
Tools
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Author (1):
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Erik Westra Erik Westra
Author Profile Icon Erik Westra
Erik Westra
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Table of Contents (11) Chapters Close

Preface 1. Getting Started with QGIS FREE CHAPTER 2. The QGIS Python Console 3. Learning the QGIS Python API 4. Creating QGIS Plugins 5. Using QGIS in an External Application 6. Mastering the QGIS Python API 7. Selecting and Editing Features in a PyQGIS Application 8. Building a Complete Mapping Application using Python and QGIS 9. Completing the ForestTrails Application Index

Chapter 5. Using QGIS in an External Application

In Chapter 1, Getting Started with QGIS, we looked briefly at a standalone Python program built using PyQt and the PyQGIS library. In this chapter, we will use the same technique to build a complete turnkey mapping application using PyQGIS. Along the way, we will:

  • Design and build a simple but complete standalone mapping application
  • Learn how to use a wrapper script to handle the platform-specific dependencies before our Python program is run
  • Define our application's user interface in a separate Python module so that we keep our UI separate from the application's business logic
  • Dynamically show and hide map layers based on the user's preference
  • Learn how to use a rule-based renderer to selectively display features based on the map's current zoom level
  • See how data-defined properties can be used to calculate the font size to use for a label based on the feature's attributes
  • Implement Google Maps style panning and...
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