Surveying
On vertical photographs, height displacement is

All listed here
Positive for points above datum
Zero for points vertically below the air station
Negative for points below datum

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Surveying
For a line AB

none is correct
the forebearing of AB and back bearing of AB differ by 180°
both (A) and (B) are correct
the forebearing of AB and back bearing of BA differ by 180°

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