Official comment
You can't adjust the flight altitude on a per pass basis using the Map Pilot app. The overlap planning is calculated using the elevation of the takeoff point. Running up a hill will reduce the distance from the aircraft to the ground resulting in a smaller image spot and reduced overlap. If you plan it at 60% overlap and reduce the ground to aircraft distance by half, you will get get half the overlap, or 30%. That isn't enough to process. If you plan it at 90%, that will only go down to 45% which is marginal at best.
If you are flying by hand, you can try to stay the same distance above the ground but it gets really hard to maintain consistent overlap.
When it doubt, err on the high side. The only thing more annoying that having too much data is not having enough.
