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QGIS 2 Cookbook

You're reading from   QGIS 2 Cookbook Become a QGIS power user and master QGIS data management, visualization, and spatial analysis techniques

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Product type Paperback
Published in Apr 2016
Publisher
ISBN-13 9781783984961
Length 390 pages
Edition 1st Edition
Tools
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Authors (3):
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 Mandel Mandel
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Mandel
 Olaya Ferrero Olaya Ferrero
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Olaya Ferrero
Anita Graser Anita Graser
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Anita Graser
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Toc

Table of Contents (19) Chapters Close

QGIS 2 Cookbook
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
1. Data Input and Output FREE CHAPTER 2. Data Management 3. Common Data Preprocessing Steps 4. Data Exploration 5. Classic Vector Analysis 6. Network Analysis 7. Raster Analysis I 8. Raster Analysis II 9. QGIS and the Web 10. Cartography Tips 11. Extending QGIS 12. Up and Coming Index

Using the Python console


QGIS has a built-in Python console, where you can enter commands in the Python programming language and get results. This is very useful for quick data processing.

Getting ready

To follow this recipe, you should be familiar with the Python programming language. You can find a small but detailed tutorial in the official Python documentation at https://docs.python.org/2.7/tutorial/index.html.

Also load the poi_names_wake.shp file from the sample data.

How to do it…

QGIS Python console can be opened by clicking on the Python Console button at toolbar or by navigating to Plugins | Python Console. The console opens as a non-modal floating window, as shown in the following screenshot:

Let's take a look at how to perform some data exploration with the QGIS Python console:

  1. First, it is necessary to get a reference to the active (selected in the layers tree) layer and store it in the variable for further use by running this command:

    layer = iface.activeLayer()
    
  2. After acquiring a...

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