This is probably old news by now and there's possibly better stuff out there by now. Still, pretty amazing stuff.
Ever wonder how they found the Boston bombers in just a few days?
This may help you to understand what the government is looking at.
This photo was taken in Vancouver, Canada and shows about 700,000
people.
Hard to disappear in a crowd. Pick on a small part of the crowd click
a couple of times -- wait – then, click a few more times and see how clear
each individual face will become each time. Or use the wheel on
your mouse.
This picture was taken with a 70,000 x 30,000 pixel camera (2100 Mega
Pixels.) These cameras are not sold to the public and are being installed
in strategic locations. The camera can identify a face among a multitude of People.
Place your computer's cursor in the mass of people and double-click a couple times. It is not so easy to hide in a crowd anymore.
http://www.gigapixel.com/mobile/?id=79995