dji PHANTOM 4 Flight Manual - Page 16
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Ensuring Correct Overlap:
Getting the correct overlap of the images is important to ensure successful data processing. Aerobotics requires at least
75% overlap and sidelap (set through the mission planning app). However, this overlap is set relative to your takeoff
point, thus where you take off from is important.
Take off from near highest point
Do NOT take off from the low part
of your mission.
This will reduce overlap between
images where the terrain is higher
than takeoff point.
Take off from near the highest
part of your mission.
This will increase overlap as the
terrain gets lower than the takeoff
point.