Book Image

Learn QGIS - Fourth Edition

By : Andrew Cutts, Anita Graser
Book Image

Learn QGIS - Fourth Edition

By: Andrew Cutts, Anita Graser

Overview of this book

QGIS 3.4 is the first LTR (long term release) of QGIS version 3. This is a giant leap forward for the project with tons of new features and impactful changes. Learn QGIS is fully updated for QGIS 3.4, covering its processing engine update, Python 3 de-facto coding environment, and the GeoPackage format. This book will help you get started on your QGIS journey, guiding you to develop your own processing pathway. You will explore the user interface, loading your data, editing, and then creating data. QGIS often surprises new users with its mapping capabilities; you will discover how easily you can style and create your first map. But that’s not all! In the final part of the book, you’ll learn about spatial analysis and the powerful tools in QGIS, and conclude by looking at Python processing options. By the end of the book, you will have become proficient in geospatial analysis using QGIS and Python.

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Table of Contents (8 chapters)
Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Get in touch
Free Chapter
1
Where Do I Start?
Where Do I Start?
Installing QGIS 3.4
Running QGIS for the first time
What is new in QGIS 3
Introducing the QGIS user interface
Finding help and reporting issues
Summary
2
Data Creation and Editing
Data Creation and Editing
Data formats
Loading data
Interacting with data
Vector data
Raster data
Other data
Summary
3
Visualizing Data
Visualizing Data
Styling data
Styling raster layers
Saving styles
Styling vector layers
Summary
4
Creating Great Maps
Creating Great Maps
Communicating with data
Labeling
Creating a map
Loading data
Summary
5
Spatial Analysis
Spatial Analysis
Processing toolbox
Analyzing raster data
Combining raster and vector data
Advanced vector and raster analysis with processing
Summary
6
Extending QGIS with Python
Extending QGIS with Python
Adding functionality using actions
Getting to know the Python console
Creating custom geoprocessing scripts using Python
Developing your first plugin
3D view
Summary
7
Other Books You May Enjoy
Other Books You May Enjoy
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Raster data

Raster data is not created like vector data. Quite often, raster data is created from other raster data, such as creating a slope raster from a topographic raster. Raster data can also be created from vector data, which can be done by gridding a series of coordinates/points. QGIS has the ability to perform all of these functions. We will further explore raster visualization in Chapter 4, Creating Great Maps, and processing rasters in Chapter 6, Extending QGIS with Python.

In this section, we will convert our Canada_Provinces.shp to a raster. In the menu, click Raster | Conversion | Rasterize (vector to raster), as shown in the following screenshot:

Vector to raster

In the following dialog box, enter these parameters:

  • Input Layer: Canada_Provinces.
  • Burn-in value: id.
  • Output raster size units: Pixels.
  • Width: 10 (this will create a raster with a width of 10 pixels...
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