According to the

P4P specs the horizontal Field Of View (FOV) is 84°.

Formula1: L = 2 x (h x tg(a/2))

Formula2: W = L / 16 x 9 (16:9 aspect ratio)

L=lenght, h=height, a=angle, W=width

tg(84/2)=0.9004

So at a height of 10 meters: L=18m & W=10.125m

CONDITIONS:

1. You're shooting (straight down) perpendicular to the ground.

2. The ground area is flat.

3. Height is from ground level, NOT take-off point.

Excel sheet:

Microsoft Excel Workbook

1drv.ms