A datum (plural datums or data) is a reference point from which measurements are made. In surveying and geodesy, a datum is a set of reference points on the Earth’s surface against which position measurements are made. Horizontal datums are used for describing a point on the Earth’s surface in latitude and longitude or another coordinate system. Vertical datums measure elevations or depths.
Check Also
IAF celebrates 26 years of Operation Safed Sagar
Indian Air Force celebrates 26 years of Operation Safed Sagar: Read how IAF flushed out …
What is a secondary datum line