QGIS 101: Prepare the DEM - Mapping catchments & streams from DEM - Part 1 of 3

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 three-part 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 SRTM-downloader to locate the DEM tiles 03:35 Build virtual raster - mosaic DEM tiles 04:28 Copy-paste 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: https://youtu.be/9ugvu0c2mv8 (THIS VIDEO) Link to Video 2: https://youtu.be/VHe5jkALa2c This video is part of the online QGIS 101 training course. For more QGIS videos see the QGIS playlist: https://youtube.com/playlist?list=PLp1lK6n-xb5Pqm6JmiwORjm8vuK5g2yf1 #filledDEM #rcarve #rfilldir