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 11. Extending QGIS

In this chapter, we will cover the following topics:

  • Defining custom projections
  • Working near the dateline
  • Working offline
  • Using the QSpatiaLite plugin
  • Adding plugins with Python dependencies
  • Using the Python console
  • Writing Processing algorithms
  • Writing QGIS plugins
  • Using external tools

Introduction

QGIS can do many things on its own. However, as with all software, there are limits to its default abilities. The great news is there are many ways to extend QGIS to do even more through built-in customization options, existing add-on plugins, creating new analysis algorithms, creating your own plugins, and using external software that compliments QGIS. This chapter covers just a few of the common customizations and plugins that haven't been mentioned in other chapters, and how you can get started with making your own add-ons to share with others.

Defining custom projections

Map projections stump just about everybody at some point in their GIS career, if not more...