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

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Surveying
Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.

By subtracting the sum of their longitudes exceeding 180° from 360° if places are in different hemispheres
By subtracting their longitudes if places are in the same hemisphere
All of these
By adding their longitudes if places are in the different hemispheres

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