Terms used in levelling
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Level surface:
Curved surface parallel to mean spheroidal surface of earth, it is perpendicular to plumb line at all points. Eg. Surface of still water
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Horizontal surface:
A plane surface tangential to level surface, it is perpendicular to plumb line at only one point
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Datum surface:
A level surface with respect to which elevation of points are measured
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Elevation/reduced level:
Height of a point above datum
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Benchmark:
A fixed reference of known elevation w.r.t. Which elevation of points are measured
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Station:
A point where staff is held for sighting
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Height of instrument:
Reduced level of line of collimation
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