Video 1 of 3, Mapping catchments and streams from DEM. In this video we will prepare a 30 m depressionless DEM of the Salma dam catchment in Afghanistan.
If we want to understand the water balance of a catchment or drainage basin, we need to start by delineating the catchment/watershed. In this threepart sequence we will prepare the DEM (Video 1), map the catchment/watershed (Video 2) and extract the streams (Video 3).

00:00 Terminology: catchment, watershed, drainage basin & drainage divide
00:49 Introduction
01:20 Location of Salma dam, Afghanistan
01:37 Step 1: Prepare the DEM
03:11 Use SRTMdownloader to locate the DEM tiles
03:35 Build virtual raster mosaic DEM tiles
04:28 Copypaste the raster style
04:50 Raster coordinate issues
05:52 Raster Projections Warp (Reproject) raster & resample pixel size
07:55 Save raster as GeoTiff
09:00 Step 2: Burn the streams
09:25 GRASS Raster r.carve
10:49 Step 3: Fill sinks
11:23 GRASS Raster r.fill.dir

Link to Video 1:    • QGIS 101: Prepare the DEM  Mapping c...   (THIS VIDEO)
Link to Video 2:    • QGIS 101: Map the Catchment  Mapping...  

This video is part of the online QGIS 101 training course.
For more QGIS videos see the QGIS playlist:    • QGIS 101  

#filledDEM #rcarve #rfilldir