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

Understanding the feature and layer blending modes

In this recipe, we will look at the different layer and feature blending modes. Using these tools, we can achieve special rendering effects, which you may already know from other graphics programs.

Getting ready

To follow this recipe, you just need to load stamen.png and effect.png from our sample data. Make sure that stamen (left-hand side in the following screenshot) is the lower layer and effect (right-hand side in the following screenshot) is the upper layer. To test the feature blending modes, load blending.shp:

(Background maps "Watercolor" and "Toner" by Stamen Design, under CC BY 3.0. Data by OpenStreetMap, under CC BY SA).

How to do it…

Using the two raster layers, we can try the different blending modes. Of course, this works for vector layers, as well:

  1. Double-click on the effects layer to open Layer Properties.

  2. You can find the blending settings by going to Layer Properties | Style | Color Rending together with other helpful controls...