Derive all subcatchments from a DEM using PCRaster in QGIS

This video shows how to use the PCRaster QGIS tools to derive all subcatchments from a DEM. We’ll convert a DEM in GeoTIFF format to PCRaster format. Then we’ll derive the local drain direction map. Next, the streamorder tool is used to derive the Strahler orders. After calibration we determine the orders of the channels from which we derive the outlets of the subcatchments. 0:00 Introduction and workflow 1:53 Convert to PCRaster format 2:20 Create local drain direction map (lddcreate) 3:20 Calculate Strahler orders (streamorder) 4:07 Derive channels from Strahler orders 5:32 Create lookup table with RAT 6:37 Reclassify Strahler orders (lookup) 7:24 Find downstream Strahler order (downstream) 7:52 Use raster calculator to find junctions 9:07 Give outlets unique ID (uniqueid) 9:56 Convert layer data type 10:30 Create nominal zero map (spatial) 10:49 Fill nodata (cover) 11:24 Derive subcatchments (catchment) 12:00 Derive subcatchments (subcatchment)