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Levelling is a method of identifying the height of one point or object parallel relative to another. It is used in surveying to create or establish the elevation of a point relative to a datum, or to establish a point at a given elevation relative to a datum.
Levelling in surveying is the process of measuring the elevation of points on the ground. It involves the use of a levelling instrument, such as a dumpy level or a theodolite, to measure the elevation of points on the ground.
The surveyor then records the data and uses it to create a map or plan of the area. Levelling is used in a variety of applications, including engineering, construction, and land management.