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.
Table of Contents (8 chapters)

Advanced vector and raster analysis with processing

In the following sections, we will cover more advanced processing tools and see how we can use the modeler to automate our tasks.

Finding nearest neighbors

Finding nearest neighbors – for example, the airport nearest to a populated place – is a common task in geoprocessing.

To do this, load the popp.shp into QGIS as well as the airports.shp, if this is not already loaded. Then search for the Distance to Nearest Hub tool (Line to Hub) in the toolbox. You should use the popp.shp as the Source points layer and the airports as the Destination hubs layer. The Hub layer name attribute will be added to the results attribute table to identify the nearest feature. Select...