From Professional aerial mapping

Collects aerial photography of 1-10sqkm in a single flight at down to 5cm precision.
The eBee has a flight time of up to 45 minutes allowing to cover areas of up to 10sqkm in a single flight. With its 16MP camera it can shoot aerial imagery at down to 3cm/pixel resolution. The images can then be used to create maps and elevation models with a precision of 5cm.

Disclaimer:  The above does seem like a sponsored ad but this site does not advertise for anyone.  I am interested in drone technology and creative applications for them and found this interesting.   Click here for more references to drones on this site.