Need to shoot a subject from directly overhead? Need to apply for an airspace authorization? Don't have time to go out to an uncontrolled area to do a manual test? Drone Field Of Vision Altitude can help. By entering your CMOS size, native resolution (4:3 or 3:2), and width of the subject you need to shoot, this app will tell you the minimum altitude you'll need to fit your subject in the frame. Use any combination of feet or meters when sizing your subject or reading your required altitude.