New Plane-Based Surveillance System Sees Practically Everything

A new surveillance camera system can track movements in a city center for over six hours. Made by the aptly named "Persistent Surveillance Systems," the HAWKEYE II can watch a 4-mile square, and because it goes on the bottom of a manned airplane like a Cessna, it is, unlike drones, probably legal...

http://www.popsci.com/article/gadgets/new-plane-based-surveillance-system-sees-practically-everything?dom=tw&src=SOC

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