Surveying
The height displacement on a vertical photograph

Increases as the horizontal distance increases from the principal point
All listed here
Decreases as the flying height increases
Increases as the ground elevation increases

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Surveying
For a line AB

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

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Surveying
The rise and fall method

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

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