Get 1 mile square farm pic

The 35mm equivalent lens is fixed. I can set different aperture or speed but FOV won't change. FOV will change with distance to the subject.
 
For P4P, how high up to get 1 mile square farm pic?
Much too high.
If you go up 400 feet, you can get a single image of an area 400 x 600 feet.

To get the farm on a single looking-down image, you would have to fly .
You would have to go up 1 mile to get an image of an area 1.5 x 1 mile

What you need for the task is specialised software to fly a mapping mission and create a huge composite image from many individual images.
It could be done, but it would be a big job.
To map a 1 mile square area from 400 feet would take 5 or 6 batteries and generate a few thousand individual overlapping images.
 
Yes DroneDeploy is for mapping, but they do have flight loads that can do vertical as well. The only two that I can think of that they do not have that many other programs do our orbit and facade inspection. You can use the flight app for free, but need a paid account to process them. Although you can just ditch in Microsoft ICE which is free.
 

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