EPSG Geodetic Parameter Dataset (also EPSG registry) is a public registry of geodetic datums, spatial reference systems, Earth ellipsoids, coordinate transformations and related units of measurement, originated by a member of the European Petroleum Survey Group (EPSG) in 1985.
Each entity is assigned an EPSG code between 1024 and 32767,[1][2] along with a standard machine-readable well-known text (WKT) representation.
The dataset was created in 1985 by Jean-Patrick Girbig of Elf, to "standardize, improve and share spatial data between members of the European Petroleum Survey Group".
[6] In 2005, the EPSG organisation was merged into International Association of Oil & Gas Producers (IOGP), and became the Geomatics Committee.
[6][7] Since then, the acronym "EPSG" became increasingly synonymous with the dataset or registry itself.