TanDEM-X

TanDEM-X
TanDEM-X (TerraSAR-X add-on for Digital Elevation Measurement) is the name of TerraSAR-X's twin satellite, a German Earth observation satellite using SAR (Synthetic Aperture Radar) - a modern radar imaging technology. It is a second, almost identical spacecraft to TerraSAR-X. TanDEM-X is also the name of the satellite mission flying the two satellites in a closely controlled formation with typical distances between 250 and 500 m.
 
The primary mission objective is the generation of a consistent global Digital Elevation Model (DEM) with an unprecedented accuracy according to better than DTED Level 2 specifications. The new DEM resolution will correspond to DTED Level 3 (post spacing of better than 12 meters) and a height accuracy of better than 2m - a standard not yet defined. Digital Elevation Models of posting better than DTED Level 2 are often called HRTI (High Resolution Terrain Information) DEM.
 

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