You're reading from QGIS Python Programming Cookbook, Second Edition Automating geospatial development

Product type Paperback

Published in Mar 2017

Publisher Packt

ISBN-13 9781787124837

Length 464 pages

Edition 2nd Edition

Languages

Python

Tools

Eclipse

Concepts

Geospatial Analysis

Author (1):

Joel Lawhead

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Table of Contents (10) Chapters

Preface

1. Automating QGIS FREE CHAPTER

2. Querying Vector Data

3. Editing Vector Data

4. Using Raster Data

5. Creating Dynamic Maps

6. Composing Static Maps

7. Interacting with the User

8. QGIS Workflows

9. Other Tips and Tricks

Adding standard map tools to the canvas

In this recipe, you'll learn how to add standard map navigation tools to a standalone map canvas. Creating the simplest possible interactive application provides a framework to begin building specialized geospatial applications using QGIS as a library.

Getting ready

Download the following zipped shapefile and extract it to your qgis_data directory into a folder named ms from https://github.com/GeospatialPython/Learn/raw/master/Mississippi.zip.

How to do it...

We will walk you through the steps required to create a map canvas, add a layer to it, and then add some tools to zoom and pan the map, which are given as follows:

First, because we are working outside the QGIS Python interpreter, we need to import some QGIS and Qt libraries:

        from qgis.gui import * 
        from qgis.core import * 
        from PyQt4.QtGui import * 
        from PyQt4.QtCore import SIGNAL, Qt 
        import sys, os

Then, we must set the location of our main QGIS application...

The rest of the chapter is locked

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Authors (1)

Joel Lawhead

Joel Lawhead is a PMI-certified Project Management Professional (PMP), a certified GIS Professional (GISP), and vice president of NVision Solutions, Inc., an award-winning firm specializing in geospatial technology integration and sensor engineering for NASA, FEMA, NOAA, the US Navy, and many other commercial and non-profit organizations. Joel began using Python in 1997 and started combining it with geospatial software development in 2000. He has authored multiple editions of Learning Geospatial Analysis with Python and QGIS Python Programming Cookbook, both from Packt. He is also the developer of the open source Python Shapefile Library (PyShp) and maintains a geospatial technical blog.

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