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Quick and dirty: the horizontal FOV of the P3 camera is 94 degrees. Call it 90. Looking nadir means you have 45 degrees going each way which will give an approximately equal distance from center to side as you are high (AGL).
Call it 2X your height.
Example: 100m AGL gives roughly a 200m wide image. With a 4:3 aspect ratio (4000x3000) the image will be 150m long.
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