Spatial reference system - Wikipedia
https://en.wikipedia.org/wiki/Spatial_reference_system
OverviewTypes of systemsComponentsExamples by continentIdentifiersSee alsoExternal linksA spatial reference system (SRS) or coordinate reference system (CRS) is a framework used to precisely measure locations on the surface of Earth as coordinates. It is thus the application of the abstract mathematics of coordinate systems and analytic geometry to geographic space. A particular SRS specification (for example, "Universal Transverse Mercator WGS 84 Zone 16N") comprises a choice of Earth ellipsoid, horizontal datum, map projection (except in the geographic coordinate system
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