Mosaic DEM Tiles in QGIS by Creating a Virtual Raster

This video covers section 4.3 of the book QGIS for Hydrological Applications, Second Edition, by Hans van der Kwast and Kurt Menke. You'll learn how to mosaic the SRTM DEM tiles to one raster by creating a virtual raster.
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[@peterokitoi7757]

is it still necessary to convert a strm dem download having only one tile into a mosaic

[@HansvanderKwast]

Obviously it doesn't make sense to mosaic 1 tile. You should mosaic if # tiles >= 2.