| Geodesy | |
|---|---|
| Fundamentals | |
| Geodesy · Geodynamics Geomatics · Cartography |
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| Concepts | |
| Datum · Distance · Geoid Figure of the Earth Geodetic system Geog. coord. system Hor. pos. representation Map projection Reference ellipsoid Satellite geodesy Spatial reference system |
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| Technologies | |
| GNSS · GPS · ... | |
| Standards | |
| ED50 · ETRS89 · NAD83 NAVD88 · SAD69 · SRID UTM · WGS84 · ... |
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| History | |
| History of geodesy NAVD29 · ... |
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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 of systems in existence are: