Surveying
The orthogonal projection of the perspective centre on a tilted photograph, is called

Nadir
Isocenter
Plumb point
Principal point

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Surveying
A ’level line’ is a

line parallel to the mean spheriodal surface of earth
line passing through the center of cross hairs and the center of eye piece
horizontal line
line passing through the objective lens and the eye-piece of a dumpy or tilting level

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