Book Image

QGIS By Example

By : Alexander Bruy, Daria Svidzinska
Book Image

QGIS By Example

By: Alexander Bruy, Daria Svidzinska

Overview of this book

Table of Contents (17 chapters)
QGIS By Example
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Graphical Modeler


As we have already seen in previous chapters, even a simple analysis may require several steps. In real-life applications, much more complex tasks exist, and they involve and combine different processes of analysis. Running them manually is a time-consuming process, and it may take hours to complete. Things become even worse and complicated when you need to run this analysis several times with different input data or use the same data with different settings.

This is where the QGIS Processing framework comes to help. It allows us to automate repeated tasks and create new complex algorithms that involve different types of data processing. With the help of the Graphical modeler from the Processing toolbox, we can easily create our own algorithms by combining existing algorithms. The created model can be executed like any other Processing algorithm, and even used as part of another, more complex model.

There are two common ways of opening the Graphical Modeler:

  • From the menu...