Automating Vector and Raster Workflows using the Graphical Modeler in QGIS
Contents
Disclaimer
Please note that this tutorial was created as a term project for the Carleton University class GEOM4008 - Advanced Topics in Geographic Information Systems. The tools used below are just a some of many that can be found within QGIS and outputs may heavily vary depending on the inputs.
Introduction
The objective of this tutorial was to provide an in-depth walk through of automating two workflows in the QGIS Graphical Modeler. The first is a simple workflow using sample vector data covering geoprocessing tools such as buffer, clip and merge. It will also demonstrate how to perform a field calculation within a model. The second workflow is more complicated and works with a sample DEM. The workflow covers the various steps required to determine the watershed basins within your area of interest. The different algorithms covered in this tutorial are; fill sinks, catchment area, channel network, watershed basins and vectorising grid classes. These algorithms are native to SAGA GIS, but through QGIS's advanced interface processing toolbox, they as well as GRASS GIS algorithms are accessible.
Software
To download QGIS, please go to the following link :
