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There is a lidar data source of digital elevation model of Germany.

  1. The spec of the lidar data is:
  • Horizontal CRS: EPSG 25832
  • Vertical DATUM: EPSG 7837
  1. I have anther DEM whose vertical datum is WGS84 Earth Gravitational Model (EGM 96) geoid.

How can I transform my DEM to make it have the same vertical datum as EPSG:7837. I don't have ground control points. Is it possible to do the transformation without GCP?

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Using gdal you can add the vertical datum with -s_scs EPSG:25832+7837:

gdalwarp -s_srs EPSG:25832+7837 -t_srs "+proj=longlat +datum=WGS84 +no_defs +geoidgrids=egm96_15.gtx" input.tif output.tif

You can download the grid from osgeo and copy the file to ../share/proj/ withing your gdal/qgis path.

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