Summer Time Aerial View From a 29 June 2015Quadcopter Flight Over Sarah’s Old Dallas Center IA Farm:
Seen at center is, a aerial view of Sarah’s Old Farmstead, looks today. Higher up, you can see the Northern Border of Sarah’s Old Farm, and the neighboring farms further North. The curved horizon is because of the Fish-Eye Lens of the camera.
A quadcopter, also called a quadrotor helicopter or quadrotor, is a multirotor helicopter that is lifted and propelled by four rotors. Quadcopters are classified as rotorcraft, as opposed to fixed-wing aircraft, because their lift is generated by a set of rotors (vertically oriented propellers). ….
The largest use of quadcopters in the USA has been in the field of aerial imagery.
https://en.wikipedia.org/wiki/Quadcopter

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