Datum: A reference point used in surveying and construction, such as a benchmark or an elevation point. A datum can be used to establish a reference point or elevation for a survey or construction project. It is important to establish a datum to ensure that the measurements taken are accurate and consistent. A datum can be any permanent object or benchmark, such as a well, a marker, or a benchmark set into the ground. This point can then be used as a reference point for other measurements. Datums are also used to establish elevations for maps and other geographic information systems.
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