Surveying
The parallax of a point on the photograph is due to

All listed here
Ground elevation
Flying height
Length of air base

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Surveying
Which of the following errors can be eliminated by taking mean of bot face observations ?

error due to imperfect graduations
error due to line of collimation not being perpendicular to horizontal axis
error due to imperfect adjustment of plate levels
error due to eccentricity of verniers

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