Book Image

QGIS 2 Cookbook

By : Alex Mandel, Víctor Olaya Ferrero, Anita Graser, Alexander Bruy
Book Image

QGIS 2 Cookbook

By: Alex Mandel, Víctor Olaya Ferrero, Anita Graser, Alexander Bruy

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 (19 chapters)
QGIS 2 Cookbook
About the Authors
About the Reviewers

Routing point sequences

In the recipes so far, we routed from one starting point to one destination point. Another use case is when we want to compute routes that connect a sequence of points, such as the points in a GPS track. In this recipe, we will use the point layer to route processing script to compute a route for a point sequence. At its core, this script uses the same idea that was introduced in the previous recipe, Calculating the shortest paths with the QGIS network analysis library, but this computes several shortest paths one after the other.

Getting ready

To follow this recipe, load network_pgr.shp and sample_pts_for_routing.shp, which contains a point layer that should be routed from the sample dataset.

Additionally, you need to get the point layer to route script from and save it in the Processing script folder, which is set to C:\Users\youruser\qgis2\processing\scripts...