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
The prismatic compass and surveyor’s compass

give whole circle bearing (WCB) of a line and quadrantal bearing (QB) of a line respectively
both give QB of a line and WCB of a line
both give WCB of a line
both give QB of a line

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