New drone carries camera with 900 times the resolution of 2 megapixel camera found in some mobile phones:

US Army unveils 1.8 gigapixel camera helicopter drone

The army said that was enough to track people and vehicles from altitudes above 20,000 feet (6.1km) across almost 65 square miles (168 sq km). In addition, operators on the ground can select up to 65 steerable “windows” following separate targets to be “stared at”. Vehicles, people and other objects can be tracked even if they move in different directions.