Smooth Stream Networks Derived from DEMs in QGIS
Channel: Hans van der Kwast
Date: 2023-08-06

Stream networks derived using stream and catchment delineation procedures in QGIS can be improved by smoothing. This video shows how to this on-the-fly using a geometry generator expression. Next, you'll see how to export the result to a new vector layer using the Export by expression tool from the Processing Toolbox.

QGIS version: 3.32 Lima, should also work with 3.28
Plugins: PCRaster Tools plugin, OpenTopography DEM Downloader plugin
Open data: (c) OpenStreetMap Contributors, SRTM
Stream and Catchment Delination tool via Resource Sharing plugin with repository https://github.com/jvdkwast/qgisrepository

0:00 Introduction
0.26 Using the Stream and Catchment Delineation Processing Tool
2:19 Styling rivers with the Interpolate Line renderer
3:06 Smooth rivers with a geometry generator expression
5:04 Store a geometry generator expression result in a new vector layer (geometry by expression tool)

#QGIS #QGISHydro #PCRaster