QGISHydro Webinar 4: Stream & Catchment Delineation

In this series of 7 free webinars during the Corona Crisis, Kurt Menke and Hans van der Kwast demonstrate the 7 chapters of the book QGIS for Hydrological Applications - Recipes for Catchment Hydrology and Water Management. In this webinar we demonstrate how to perform stream and catchment delineation in QGIS using the SAGA tools from the toolbox. We also show how to visualise the flow direction map and use the 3D view. Join us next Friday from 9 pm CEST / 7 pm UTC. Register at http://loc8.cc/qgishydro The book is available at http://locatepress.com/hyd (c) OpenStreetMap Contributors --------------------------------------------------------------------------------------------------------- Note that with the new dependencies in QGIS this will not work. For work around see:    • Install QGIS with SAGA 2.x (old dependencies)   And also see: https://github.com/qgis/QGIS/issues/4... --------------------------------------------------------------------------------------------------------- 0:00 Introduction QGISHydro Webinar 4 7:59 Start demo Stream and Catchment Delineation 10:35 Download SRTM tiles 14:00 Mosaic SRTM tiles to virtual layer 15:38 Reproject and subset DEM 20:28 Fill sinks 22:28 Profile tool 23:33 Style DEM 26:18 Calculate Strahler orders 27:08 Style ordinal raster 28:08 Calibrate Strahler orders 31:50 Delineate streams and basins, flow direction 34:39 Style channels using calibrated Strahler orders 36:55 Style flow direction layer with ramp 42:30 Style flow direction using Crayfish plugin 46:22 Define outflow point 46:47 Delineate catchment 49:17 Polygonize the catchment 52:43 Clip layers to catchment boundary 56:20 Visualise in 3D view 57:48 Q & A 1:07:25 Shameless plugs