Still image quality at various heights and distances from object - Phantom 4
Data collected 28 May 2016 Glencoe, IL. Object is 21 x 16 x 10 inches. 

At a height of 15 feet AGL, observers found the drone intrusive and threatening. At a height of 25 feet AGL, observers knew the drone was there but found its presence more tolerable.
50 feet horizontally
25 feet AGL
25 feet horizontally
25 feet AGL
20 feet horizontally
25 feet AGL
20 feet horizontally
20 feet AGL
15 feet horizontally
20 feet AGL
15 feet horizontally
15 feet AGL