Spy satellites could analyse shadows from space to help identify terrorists

A computer programme has been developed to process the image of a shadow cast on the ground, and match it up with its owner.

The technique, called gait analysis, works on the premise that it is extremely difficult to disguise your walking style.

Webmaster's Commentary: 

... as long as it's a sunny day, the suspect is walking on flat ground, and not in a crowd.

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