what is a datum?
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Datum in surveying is used by surveyors to locate or imagine a reference or starting point for maps, plans and it is also used to measure an object considering datum as reference.
A datum in surveying is a reference point used to measure the height of points on the surface of the earth. It is usually determined by taking elevation readings from a known benchmark and then using these readings as a baseline for other measurements.
The datum is important because it allows surveyors to accurately measure the heights of points on the landscape, which is essential for construction and engineering works.