Book Image

QGIS Quick Start Guide

By : Andrew Cutts
Book Image

QGIS Quick Start Guide

By: Andrew Cutts

Overview of this book

QGIS is a user friendly, open source geographic information system (GIS). The popularity of open source GIS and QGIS, in particular, has been growing rapidly over the last few years. This book is designed to help beginners learn about all the tools required to use QGIS 3.4. This book will provide you with clear, step-by-step instructions to help you apply your GIS knowledge to QGIS. You begin with an overview of QGIS 3.4 and its installation. You will learn how to load existing spatial data and create vector data from scratch. You will then be creating styles and labels for maps. The final two chapters demonstrate the Processing toolbox and include a brief investigation on how to extend QGIS. Throughout this book, we will be using the GeoPackage format, and we will also discuss how QGIS can support many different types of data. Finally, you will learn where to get help and how to become engaged with the GIS community.
Table of Contents (9 chapters)

Styling raster data

Turn off all the vector layers. In this section, we are going to focus on rendering raster data. Load into the map the SR_50M_alaska_nad and landcover layers. We will style these layers. The options for styling raster data include the following:

  • Multiband color: When you have three or more raster bands (for example, a satellite image), this option allows you to choose which bands are for the red, green, and blue channels
  • Paletted/Unique values: Colors discrete raster data (landcover classification, for example)
  • Singleband gray: Applies a black to white or white to black color ramp for continuous raster data (elevation data, for example)
  • Singleband pseudcolor: Will apply a color ramp to continuous raster data (elevation data, for example)
  • Hillshade: Will style a DEM as a hillshade raster on the fly

The SR_50M_alaska_nad image will, by default, load as Singleband...