Surveying
In direct method of contouring, the process of locating or identifying points lying on a contour is called

vertical control
centring
horizontal control
ranging

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Surveying
A ’level line’ is a

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

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