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. Is usually an imaginary level surface or arbitrarily assumed level surface, from which vertical distances are measured
Datum
Elevation
Bench Mark (B.M.)
Line of collimation
Axis of telescope
Ans. Datum
Vertical datum - Any level surface to which elevations are referenced. This is the surface that is arbitrarily assigned an elevation of zero. Elevation - The distance measured along a vertical line from a vertical datum to a point or object.
By: Brijesh Kumar ProfileResourcesReport error
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