The German Earth observation satellite TanDEM-X, together with its twin satellite, TerraSAR-X, have completely mapped the entire land surface of Earth after only a year of service.
The data is being used by the German Aerospace Center (Deutsches Zentrum fur Luft- und Raumfahrt; DLR) – which controls both radar satellites – to create the world's first single-source, high-precision, 3D digital elevation model of Earth.
Over the last year, the two radar satellites have been moving through space in close formation – at times just a few hundred metres apart. Strip by strip, they have recorded Earth from different angles and transmitted high-resolution radar data from their orbit at an altitude of 514 kilometres down to the three ground stations - Kiruna (Sweden), Inuvik (Canada) and O'Higgins (Antarctica).
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