Gizmodo has written about the “World’s Highest Resolution Camera”, with 1.8 gigapixels, which is being developed for the US government. They shared this clip from the PBS show NOVA which recently broadcast an episode called “Rise of the Drones”.
This is the next generation of surveillance. … It is important for the public to know that some of these capabilities exist. – BAE Systems Engineer Yiannis Antioniades, who designed the sensor
I know some folks working on drone-related journalism and drone-related photography. This should give you some more ideas about what might be possible. And I can’t help but think of what extreme ‘Google Street View’ style projects could be possible from a camera also known as “Wide-Area Persistant Stare’. Maybe some day we’ll see such a thing, for now it remains a classified US Government program.