Correct me if I’m wrong but the field of view of the ground on a given camera is going to be 50% smaller if you fly at half the altitude. So the area of the ground captured at 100ft altitude is going to be 50% of the area captured at 200ft.
If you go into DroneDeploy, and create a mission (Mavic 2 Pro Drone), 39 acres for this example, 200ft AGL, default overlap of 65% sidelap, 75% frontlap, it gives you 491 total photos.
Now if you turn on terrain mode and tell it the tallest feature above your launch point is 100ft, essentially the software (assuming you have terrain follow turned OFF) has to then basially assume you are flying at 100ft AGL instead of 200ft since there are elevation rises as high as 100ft within the mission.
When you do this, it changes the overlap to 80% sidelap, 85% frontlap with a totla of 1443 images I don’t see how that could be correct.
Wouldn’t the equivalent overlap at a mission flown at 100ft be half the overlap if flown at 200ft and would result in the same number of photos? Why on DD does it go from 491 images to 1443 images on a 200ft mission when you turn terrain mode on with 100ft highest ground elevation?
I think this has something to do with the area is actually the factor of elevation change squared. So flying 50% lower, the width and height of the frame is going to be 1/4 the length bt the