The Germans have launched a second synthetic aperture radar (SAR) satellite on a Russian rocket. This satellite follows the launch of TERRASAR by a few months. What they're going to do is fly the two satellites in close formation, allowing the generation of very high resolution Digital Elevation Maps (DEMs, of course) via interferometry.
That's about as much as I understand. Still, you've got to admire the technology.
TanDEM-X launched, returns first images (the Daily Mail may be a tabloid, but it also covers science pretty well, with some exceptions, particularly climate change)
TanDEM-X technical concept
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