Just trying to understand your flight .. you saying you flew really low and flew an orbit .. then went up and flew a bigger orbit - same centre? And on? Not a whole lot of point as I see it - you want to fly overlapping (horizontally) orbits .. So flying at say 30m .. 45 degree gimbal .. that will be about 1cm GSD with your Phantom give or take. Fly in a pattern of equilateral triangles .. one orbit at each point of the triangle .. one in the middle .. 60m side for the triangles .. make sense? So the orbits are flown in kind of a triangular mesh pattern. If you are just flying this building .. I'd probably do one just outside each corner .. maybe one in the middle each side if you were motivated .. about 45 images per orbit .. about 250 images all up. Should be heaps.
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