If the focal length of lens (f), flying height (H) and height of ground above mean sea level (h) are known, then the scale at height 'h' (Sh) is equal to

1
f / (H - h)
2
(H - h) / f
3
(h - H) / 2f
4
2f / (h - H)
5
(h - H) / 4f

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