Table 1. Main characteristics of the UAV and sensor settings during the flight.

UAV microdrone md4-1000	SONY α ILCE-5100L + E 20 mm F2.8
Vertical speed: 1.0 m s-1 Cruising speed: 5.0 m s-1 Flight length: 2 km Flight height: 80 m Flight time: 10 minutes	Weight: 238+69 g Sensor pixel size: 0.004 x 0.004 mm Image size: 6,000 x 4,000 pixel Focal Length: 20 mm Shutter speed: 1/1600 s ISO: 100 F-stop: F/3.5