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TanDEM-X (TerraSAR-X add-on for Digital Elevation Measurements) is an innovative formation flying radar mission that opens anew era in spaceborne radar remote sensing. Its primary objective is the acquisition of a global Digital Elevation Model (DEM) withunprecedented accuracy (12 m horizontal resolution and 2 m relative height accuracy). This goal is achieved by extending theTerraSAR-X synthetic aperture radar (SAR) mission by a second TerraSAR-X like satellite, TanDEM-X (TDX). Both satellites flyin close orbit formation of a few hundred meters distance, and the resulting large single-pass SAR interferometer features flexiblebaseline selection enabling the acquisition of highly accurate cross-track interferograms not impacted by temporal decorrelation andatmospheric disturbances. Beyond the global DEM, several secondary mission objectives based on along-track interferometry as wellas new bistatic and multistatic SAR techniques have been defined. Since 2010 both satellites have been operated in close formationto map all land surfaces at least twice and difficult terrain even up to four times. While data acquisition for the DEM generation willbe concluded by the end of 2014 it is expected to complete the processing of the global DEM in the second half of 2016

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

TANDEM-X MISSION STATUS