Surveying
The parallax equation Δp = BmΔh/H - h is applicable to entire overlap of the photographs only if parallax is measured

Parallel to base line
Normal to base line
Neither (A) nor (B)
Both (A) and (B)

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Surveying
Contour interval is

Inversely proportional to the scale of the map
Larger for accurate works
Larger if the time available is more
Directly proportional to the flatness of ground

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Surveying
The rise and fall method

is not suitable for levelling with tilting levels
provides a check on the reduction of intermediate point levels
is less accurate than height of instrument method
quicker and less tedious for large number of intermediate sights

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