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QGIS 2 Cookbook

QGIS 2 Cookbook

By : Mandel, Olaya Ferrero, Anita Graser
5 (1)
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QGIS 2 Cookbook

QGIS 2 Cookbook

5 (1)
By: Mandel, Olaya Ferrero, Anita Graser

Overview of this book

QGIS is a user-friendly, cross-platform desktop geographic information system used to make maps and analyze spatial data. QGIS allows users to understand, question, interpret, and visualize spatial data in many ways that reveal relationships, patterns, and trends in the form of maps. This book is a collection of simple to advanced techniques that are needed in everyday geospatial work, and shows how to accomplish them with QGIS. You will begin by understanding the different types of data management techniques, as well as how data exploration works. You will then learn how to perform classic vector and raster analysis with QGIS, apart from creating time-based visualizations. Finally, you will learn how to create interactive and visually appealing maps with custom cartography. By the end of this book, you will have all the necessary knowledge to handle spatial data management, exploration, and visualization tasks in QGIS.
Table of Contents (14 chapters)
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13
Index

Automating multiple route computation using batch processing


If you have multiple input point layers, you can use Processing's batch processing capabilities to speed up the process. In this recipe, we will compute routes for two input point layers at once, but the same approach can be applied to many more layers.

Getting ready

To follow this recipe, load network_pgr.shp and the two point layers, sample_pts_for_routing.shp and sample_pts_for_routing2.shp.

How to do it…

To get started, right-click on the point layer to route tool in the Processing Toolbox option and select Execute as batch process. Then perform the following steps:

  1. In the points column, click the button and use the Select from open layers option to select sample_pts_for_routing and sample_pts_for_routing2.

  2. Select and remove the third line using the Delete row button at the bottom of the dialog.

  3. In the network column, click the button and use the Select from open layers option to select network_pgr. You can avoid having to pick...

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