Digital Elevation Model (DEM) Processing

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This section is still under construction! This article was last modified on 01/21/2014. If you have comments please use the Discussion page or contribute to the article!

This article is part of the QGIS tutorial 2013/14.
In this article you will learn how to pre-process and enhance digital elevation model (DEM) data, as well as how to create a 3D-Model

Loading, merging and reprojection of DEM data

  1. Add the raster layers N51E009.hgt and N51E010.hgt to a new QGIS project (from geodata\raster\DEM, see Course data). Arrange the first above the latter layer.
  2. Merging layers
    • Select Raster --> Miscellaneous --> Merge. In the appearing menu, click the Select in beside the Input files field. Browse for the maps N51E009.hgt and N51E010.hgt and select both (by clicking with pressed Ctrl key).
    • Select an output directory and file name (e.g. N510_merged) under Output file. Confirm with OK.
  3. Reprojecting layers (warp)
    • Select Raster --> Projections --> Warp (reprojects).
    • As Input file choose the merged layer from the preceding step. Select an according path and file name for Output file.
    • Determine the correct source and target coordinate system (Source SRS and Target SRS -- The coordinate system of the source layer is WGS84 (EPSG:4326). Use UTM32 (EPSG:32632) as target.
    • Confirm with OK.
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