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 with one-way streets in the Road graph plugin

When it comes to vehicle routing, it is often necessary to go into more detail and consider driving restrictions, such as one-way streets. This recipe shows you how to use one-way street information to route with the Road graph plugin.

Getting ready

To follow this recipe, load network_pgr.shp from the sample data. Additionally, make sure that the Road graph plugin is enabled in Plugin Manager.

How to do it…

To demonstrate routing with one-way street information, we will first visualize the one-way values, and then we will configure the Road graph plugin to use the one-way information, as follows:

  1. Before we start routing with one-way information, it is helpful to visualize the one-way streets. It is worth noting that the one-way direction will depend on the direction of the link geometry (that is, the direction the link was digitized in). The best way to visualize the link direction is by assigning arrow symbols, as shown in the following screenshot...