Discussion
If D = Detector Dimension, F = Focal Length, H = Flying Height, then Ground Resolution Element (GRE) is equal to
Answer: A
By similar triangles, a detector of size D at focal length F corresponds on the ground to the same angle seen from the flying height H.\[ \mathrm{GRE} = \frac{D}{F} \times H \]So the ground resolution element is (D/F) times H. D/F is the angular size (scale factor) and has no height in it, H/F is the reciprocal of the scale and is not a ground size, and D/H is unrelated to the geometry, so only the first option is a ground distance in the right units.
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