Definitions Edit

A datum is

a definition of the origin, orientation, and scale of the coordinate system; usually a system of coordinate positions on a surface (horizontal datum) or heights above or below a surface (vertical datum).[1]
[a]ny numerical or geometrical quantity or set of such quantities which may serve as reference or base for other quantities. Where the concept is geometric, the plural form is "datums" in contrast to the normal plural "data."[2]
[a] standard position or level that measurements are taken from.[3]

Datum is the singular of data.

References Edit

  1. Geospatial Information and Geographic Information Systems (GIS): An Overview for Congress, at 3.
  2. Operational Terms and Graphics, at 1-51.
  3. California Technology Agency, Enterprise Architecture Glossary 3 (Apr. 2011) (full-text).

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