Ms 2025 Datum Definition. Definition and importance of datum in gd&t in gd &t, a datum is a reference point, line, or plane from which other measurements, locations, and orientations of other. It is a mathematical model that describes the earth's shape and is critical in.
A datum is a reference or base for a system of geographic coordinates that serves as a standard measurement. It is probably customary to use date() as the default value in the table definition default value and constraints.