Book Image

QGIS:Becoming a GIS Power User

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

QGIS:Becoming a GIS Power User

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

Overview of this book

The first module Learning QGIS, Third edition covers the installation and configuration of QGIS. You’ll become a master in data creation and editing, and creating great maps. By the end of this module, you’ll be able to extend QGIS with Python, getting in-depth with developing custom tools for the Processing Toolbox. The second module QGIS Blueprints gives you an overview of the application types and the technical aspects along with few examples from the digital humanities. After estimating unknown values using interpolation methods and demonstrating visualization and analytical techniques, the module ends by creating an editable and data-rich map for the discovery of community information. The third module QGIS 2 Cookbook covers data input and output with special instructions for trickier formats. Later, we dive into exploring data, data management, and preprocessing steps to cut your data to just the important areas. At the end of this module, you will dive into the methods for analyzing routes and networks, and learn how to take QGIS beyond the out-of-the-box features with plug-ins, customization, and add-on tools. This Learning Path combines some of the best that Packt has to offer in one complete, curated package. It includes content from the following Packt products: ? Learning QGIS, Third Edition by Anita Graser ? QGIS Blueprints by Ben Mearns ? QGIS 2 Cookbook by Alex Mandel, Víctor Olaya Ferrero, Anita Graser, Alexander Bruy
Table of Contents (6 chapters)

Chapter 7. Raster Analysis I

In this chapter, we will cover the following recipes:

  • Using the raster calculator
  • Preparing elevation data
  • Calculating a slope
  • Calculating a hillshade layer
  • Analyzing hydrology
  • Calculating a topographic index
  • Automate analysis tasks using the graphical modeler

Introduction

Raster analysis is a classic area in GIS analysis. This chapter shows you some of the most important and common tasks of raster analysis. Elevation data is commonly stored as raster layers, and in this format, it is particularly suitable to run a large variety of analysis. For this reason, terrain analysis has traditionally been one of the main areas of raster analysis, and we will show you some of the most common operations that are related to Digital Elevation Models (DEM), from simple analysis, such as slope calculation, to more complex ones, such as drainage network delineation or watershed extraction.

Using the raster calculator

The raster calculator is one of the most flexible and versatile...