Surveying
On vertical photographs, height displacement is

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

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Surveying
If altitude bubble is provided both on index frame as well as on telescope of a theodolite, then the instrument is levelled with reference toi) altitude bubble on index frameii) altitude bubble on index frame if it is to be used as a leveliii) altitude bubble on telescopeiv) altitude bubble on telescope if it is to be used as a level The correct answer is

both (ii) and (iii)
only (iii)
both (i) and (iv)
only (i)

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