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
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Creating custom geoprocessing scripts using Python

In Chapter 5, Spatial Analysis, we used the tools of Processing Toolbox to analyze our data. We are not limited to these tools, however, as we can also write our own. We can expand processing with our own scripts. The advantages of processing scripts over normal Python scripts, such as the ones we saw in the previous section, are as follows:

  • Processing automatically generates a graphical user interface for the script to configure the script parameters
  • Processing scripts can be used in Graphical modeler to create geoprocessing models

Writing your first processing script

We will now create our first script that fetches some layer information. The processing has been completely...

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