German TanDEM-X satellite seeks 3D view of Earth
The TanDEM-X satellite has blasted into orbit on a mission to acquire the most precise 3D map of the Earth's surface.
The German radar spacecraft will fly in formation with an identical platform called TerraSAR-X launched in 2007.
Together, the pair will measure the variation in height across the globe to an accuracy of better than two metres.
http://news.bbc.co.uk/2/hi/science_a...t/10362030.stm
Also
http://www.spaceflightnow.com/news/n1006/21dnepr/