Surveying
The relation between the air base (B), photographic base (b), flying height (H) and the focal length (f) of a vertical photograph, is

B = b/fH
B = H/bf
B = bH/f
B =f/bH

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Surveying
Bowditch rule is applied to

determine the effect of local attraction
a closed traverse for adjustment of closing error
an open traverse for graphical adjustment
None of these

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