Open Digital Elevation Model (OpenDEM)
The Portal for sharing the 3rd Dimension
First Open Government Data Digital Terrain Model available for Germany
For the German Federal State Hamburg the first Digital Terrain Model Open Government Dataset is available (click on the Image to Search the Catalogue).
The Open DEM SRTM DTM Processing Howto is online (click on the image).
This Howto explains how to compute an approximately Digital Terrain Model from the SRTM dataset and OSM data land-use/-cover classes for correction (click on the image).