It's been three years since we first heard about DARPA's ARGUS-IS, but thanks to a PBS Nova special entitled "Rise of the Drones," we finally have more information about the 1.8-gigapixel camera that is supposedly the highest-resolution surveillance system in the world. The documentary showed video footage of the imaging system in action, though the camera itself remains shrouded in mystery for security reasons. Designed to be used withUAVs like thePredator, the ARGUS-IS (which stands for Autonomous Real-time Ground Ubiquitous Surveillance - Imaging System) can spot a six-inch object within a ten square mile radius from 20,000 feet in the air. As shown in the clip after the break, the high-res cam doesn't quite reveal facial features, but you can spot details like a bird flying around a building and the color of someone's clothes.