Q. Name the level surface to which the elevations are referred:
Solution:
Datum : The level surface (real or imaginary) used for reference is called a datum
A benchmark is a point of reference by which something can be measured. In surveying
Base line : one of known measure or position used (as in surveying or navigation) to calculate or locate something
Changing point : A surveying point on which a level rod is held, after a foresight has been made on it, and before the differential-leveling instrument is moved to another station so that a backsight may be made on it to determine the height of instrument after the resetting
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