Building Mapping Applications With QGIS by Westra, Erik -- Read -- Imperial Library of Trantor

Index

Building Mapping Applications with QGIS

Table of Contents Building Mapping Applications with QGIS Credits About the Author About the Reviewers www.PacktPub.com

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Preface

What this book covers What you need for this book Who this book is for Conventions Reader feedback Customer support

Downloading the example code Downloading the color images of this book Errata Piracy Questions

1. Getting Started with QGIS

About QGIS

Installing and running QGIS Understanding QGIS concepts

Linking QGIS and Python

Exploring the Python Console Examining a Python plugin Writing an external application

Summary

2. The QGIS Python Console

Using the console Working with geospatial data in the console Scripting the QGIS user interface

The status bar The message bar Progress indicators QGIS logging Custom dialogs and windows

Summary

3. Learning the QGIS Python API

About the QGIS Python APIs Deciphering the C++ documentation Organizing the QGIS Python libraries

The qgis.core package

Maps and map layers Coordinate reference systems Vector layers

Displaying vector data Accessing vector data Spatial indexes

Raster layers

How raster data is displayed Accessing raster data

Other useful qgis.core classes

The qgis.gui package

The QgisInterface class The QgsMapCanvas class The QgsMapCanvasItem class The QgsMapTool class Other useful qgis.gui classes

Using the PyQGIS library

Analyzing raster data Manipulating vector data and saving it to a shapefile Using different symbols for different features within a map Calculating the distance between two user-defined points

Summary

4. Creating QGIS Plugins

Getting ready Understanding the QGIS plugin architecture Creating a simple plugin The plugin development process

Using the Plugin Builder Automating the build process Plugin help files Unit testing Distributing your plugin

Writing a useful plugin Possibilities and limitations of plugins Summary

5. Using QGIS in an External Application

Introducing Lex Getting the data Designing the application Creating the application's framework Adding the user interface Connecting the actions Creating the map canvas Labeling the points Filtering the landmarks Implementing the zoom tool Implementing the pan tool Implementing the explore mode Further improvements and enhancements Summary

6. Mastering the QGIS Python API

Working with symbol layers Combining symbol layers Implementing symbol layers in Python Implementing renderers in Python Working with custom map layers Creating custom map canvas items Using memory-based layers Summary

7. Selecting and Editing Features in a PyQGIS Application

Working with selections Using the layer editing mode Adding Points Editing Points Deleting Points and other features Adding lines and polygons Editing lines and polygons Summary

8. Building a Complete Mapping Application using Python and QGIS

Introducing ForestTrails Designing the ForestTrails application Creating the application

Laying out the application Defining the toolbar icons The constants.py module The forestTrails.py module The mapTools.py module The ui_mainWindow.py module Running the application

Obtaining the basemap Defining the map layers Defining the map renderers The Pan Tool Implementing the track editing mode Summary

9. Completing the ForestTrails Application

The Add Track map tool Testing the application Vertex snapping The Edit Track map tool The Delete Track map tool The Get Info map tool The Set Start Point and Set End Point actions The Find Shortest Path action Adjusting the toolbar actions Suggested improvements Summary

Index

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