They began as wartime technology, but now drones are changing the way we witness the world, especially when we can't see it for ourselves.
Technology which located Mayan cities has been used to rediscover a southern African city from the 15th century.
Long awaited changes to the regulations on some drone flights in Australia are set to give the industry a shake up.
Expert image analysts have an important role to play, even in an age of computer interpretation and crowdsourcing.
Constant, complex changes in cities and mine sites are hard to monitor. Drawing on digital aerial photography, it's now possible to track land-use and vegetation changes in areas as small as 10-20cm.