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[pdf] LEVELING Ebook & Notes  

This book contain 30 pages notes with objective and conventional Questions 

3.1 LEVELLING
Levelling is an operation in surveying performed to determine the difference in levels of two points.
By this operation the height of a point from a datum, known as elevation, is determined.
3.2 LEVEL SURFACE
A level surface is the equipotential surface of the earth’s gravity field. It is a curved surface and
every element of which is normal to the plumb line.
3.3 DATUM
A datum is a reference surface of constant potential, called as a level surface of the earth’s gravity
field, for measuring the elevations of the points. One of such surfaces is the mean sea level surface
and is considered as a standard datum. Also an arbitrary surface may be adopted as a datum.
3.4 LEVEL LINE
A line lying in a level surface is a level line. It is thus a curved line.

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