Book Image

Mastering Geospatial Development with QGIS 3.x - Third Edition

By : Shammunul Islam, Simon Miles, Kurt Menke, GISP, Richard Smith Jr., GISP, Luigi Pirelli, John Van Hoesen, GISP
Book Image

Mastering Geospatial Development with QGIS 3.x - Third Edition

By: Shammunul Islam, Simon Miles, Kurt Menke, GISP, Richard Smith Jr., GISP, Luigi Pirelli, John Van Hoesen, GISP

Overview of this book

QGIS is an open source solution to GIS and widely used by GIS professionals all over the world. It is the leading alternative to proprietary GIS software. Although QGIS is described as intuitive, it is also, by default, complex. Knowing which tools to use and how to apply them is essential to producing valuable deliverables on time. Starting with a refresher on the QGIS basics and getting you acquainted with the latest QGIS 3.6 updates, this book will take you all the way through to teaching you how to create a spatial database and a GeoPackage. Next, you will learn how to style raster and vector data by choosing and managing different colors. The book will then focus on processing raster and vector data. You will be then taught advanced applications, such as creating and editing vector data. Along with that, you will also learn about the newly updated Processing Toolbox, which will help you develop the advanced data visualizations. The book will then explain to you the graphic modeler, how to create QGIS plugins with PyQGIS, and how to integrate Python analysis scripts with QGIS. By the end of the book, you will understand how to work with all aspects of QGIS and will be ready to use it for any type of GIS work.
Table of Contents (18 chapters)
Title Page
Copyright and Credits
About Packt
Contributors
Preface
Index

Using diagrams to display thematic data


To add a diagram, open the vector's Layer Properties window and then click on the Diagrams tab. The Diagrams tab, as shown in the following screenshot, has five sections, as well as a Diagram type selector.

Note

QGIS supports the addition of three diagram types as overlays on top of vector data. The three diagram types are pie charttext diagram, and histogram. The underlying vector data can still be styled to provide a nice base map.

TheDiagram type selector allows you choose which type of diagram to use: Pie chart, Text diagram, or Histogram. When you choose a type of diagram, the other five sections change to contain the options that are appropriate for the diagram type.

The sections are Attributes, Rendering, Size, Placement, Options, and Legend. Attributes is common to all diagram types and provides the mechanism for adding attributes to diagrams. Size and Placement contain parameters that are shared by all of the diagram types. Appearance and Options...