Heights can also be measured using total stations, handheld lasers and GPS devices.
However, levelling offers an inexpensive, simple and accurate method for measurinheights, and it is widely used in construction sites.
Any method of measuring the heights of points above or below the ground using anagreed datum.
These datum's or reference points are present in all construction sites and has an
arbitrary height assigned to the point. Most construction sites will have several of th
benchmarks, and if they have heights based on an arbitrary datum, they are known Temporary Bench Marks.