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Spatial reference system
A spatial reference system (SRS) or coordinate reference system (CRS) is a coordinate-based local, regional or global system used to locate geographical entities. A spatial reference system defines a specific map projection, as well as transformations between different spatial reference systems. Spatial reference systems are defined by the OGC's Simple feature access using well-known text, and support has been implemented by several standards-based geographic information systems. Spatial reference systems can be referred to using a SRID integer, including EPSG codes defined by the International Association of Oil and Gas Producers.
Some systems are:
*Universal Transverse Mercator coordinate system
*British national grid reference system
*Hellenic Geodetic Reference System 1987
*Irish grid reference system
*Irish Transverse Mercator
*Israeli Transverse Mercator
*Israeli Cassini Soldner
*Jordan Transverse Mercator
*Lambert conformal conic projection
*International mapcode system
*Military grid reference system
*United States National Grid
It is specified in ISO 19111:2007 Geographic information—Spatial referencing by coordinates, also published as OGC Abstract Specification, Topic 2: Spatial referencing by coordinate.()
==See also==
*Geodesy
*Geographic information system (GIS).
* List of National Coordinate Reference Systems
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