Surveying
On vertical photographs, height displacement is

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

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Surveying
A telescope is said to be inverted if its

vertical circle is to its left and the bubble of the telescope is down
vertical circle is to its left and the bubble of the telescope is up
vertical circle is to its right and the bubble of the telescope is up
vertical circle is to its right and the bubble of the telescope is down

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