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  • TanDEM-X is the name of TerraSAR-X's twin satellite, a German Earth observation satellite using SAR - a modern radar imaging technology. Implemented in a Public-Private-Partnership between the German Aerospace centre and EADS Astrium, 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. This unique twin satellite constellation will allow the generation of the WorldDEM™, the seamless global digital elevation models available from 2014. Wikipedia

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