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QGIS Python Programming Cookbook, Second Edition

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

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Product type Paperback
Published in Mar 2017
Publisher Packt
ISBN-13 9781787124837
Length 464 pages
Edition 2nd Edition
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Author (1):
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Joel Lawhead Joel Lawhead
Author Profile Icon Joel Lawhead
Joel Lawhead
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Toc

Table of Contents (10) Chapters Close

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 a scale bar to a map

A scale bar is one of the most important elements of a map composition, as it defines the scale of the map to determine the ground distance on the map. The QGIS composer allows you to create several different types of scale bars from a simple text scale ratio to a graphical, double bar scale bar with two measurement systems. In this recipe, we'll create a scale bar that increments in kilometers.

Getting ready

You will need to download the following zipped shapefile and extract it to your qgis_data directory in a subdirectory named ms:

https://github.com/GeospatialPython/Learn/raw/master/mississippi.zip

https://github.com/GeospatialPython/Learn/raw/master/Mississippi.zip

In addition to the shapefile, you will also need the MapComposer class. This class encapsulates the boilerplate composer code in a reusable way, to make adding other elements easier. You can download it from https://github.com/GeospatialPython/Learn/raw/master/MapComposer.py.

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