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Trapping Bin Laden
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2. Spy satellites
Spy satellites have been scanning Afghanistan for signs of anything that could be a hide-out. While the satellites’ exact capabilities are not in the public domain, they are thought to be able to pick out objects 10cm across.
If there is cloud cover, the US can deploy an advanced space-based radar system powerful enough to produce near-photographic quality images in any weather conditions.
Satellite intelligence needs to be supported by what the miltiary call "ground truths". Once military commanders have an idea of where to look, they need other technology and intelligence on the ground to confirm they're on the right track.


See also:
US launches anti-terror satellite
US buys Afghanistan images rights

Full coverage of US attacks and their aftermath
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