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

Working with the Data Plotly plugin


This Data Plotly plugin allows you to draw JavaScript library D3 plots in QGIS and is a new addition to QGIS. You can use this plugin by installing the Data Plotly plugin from the Plugins menu in the menu bar. For this, we will use the shapefile BGD_adm3_data_re.shp. Now, to use this plugin, click Plugins | Data Plotly | DataPlotly. This opens a panel on the right-hand side. We will now make a box plot for the value2field of this layer. To do so, select BGD_adm3_data_re for Layer and select value2 for Y Field. Note that there is also the Grouping Field option, which allows us to get multiple bar plots grouped by the field selected here. We can also change the color properties of this plot along with the transparency. This panel will look like this:

Now, click on Create Plot at the bottom right to get a box plot of the field value2. This will give the following box plot. If you hover the mouse over this boxplot, you will see the minimum, maximum, median...