If you have a roof that is 40 feet off the ground, and you want a GSD that requires an AGL altitude of 20 feet, then you have to fly 60 feet off the ground.
However, the effective overlap and sidelap will not be the same for the roof which is 40 feet closer to the camera as the closer the object the faster it moves through the frame.
How do you calculate what you need to increase the overlap and sidelap to, to get an effective overlap of objects in a plane of the photo that has a smaller field of view than the ground?
is there an “RSD” mode you can activate?
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