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
A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity. Any other quantity of that kind can be expressed as a mul ...
. Originally created by
European Petroleum Survey Group (EPSG). Each entity is assigned an EPSG code between 1024-32767,
along with a standard machine-readable
well-known text (WKT) representation. The dataset is actively maintained by the
IOGP Geomatics Committee.
Most
geographic information systems (GIS) and GIS
libraries
A library is a collection of materials, books or media that are accessible for use and not just for display purposes. A library provides physical (hard copies) or digital access (soft copies) materials, and may be a physical location or a vir ...
use EPSG codes as
Spatial Reference System Identifiers (SRIDs) and EPSG definition data for identifying coordinate reference systems, projections, and performing transformations between these systems, while some also support SRIDs issued by other organizations (such as
Esri
Esri (; Environmental Systems Research Institute) is an American multinational geographic information system (GIS) software company. It is best known for its ArcGIS products. With a 43% market share, Esri is the world's leading supplier of GIS ...
).
Common EPSG codes
* EPSG:4326 -
WGS 84, latitude/longitude coordinate system based on the Earth's center of mass, used by the
Global Positioning System among others.
* EPSG:3857 -
Web Mercator projection used for display by many web-based mapping tools, including Google Maps and OpenStreetMap.
*EPSG:7789 -
International Terrestrial Reference Frame
The International Terrestrial Reference System (ITRS) describes procedures for creating reference frames suitable for use with measurements on or near the Earth's surface. This is done in much the same way that a physical standard might be descr ...
2014 (ITRF2014), an Earth-fixed system that is independent of continental drift.
History
The dataset was originally created by European Petroleum Survey Group in 1985 and was made public in 1993.
In 2005, the EPSG organisation was merged into
International Association of Oil & Gas Producers (IOGP), and became the Geomatics Committee. However, the name of the EPSG registry was kept to avoid confusion.
Since then, the acronym "EPSG" became increasingly synonymous with the dataset or registry itself.
References
External links
*
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Spatial databases
Spatial analysis
Geodesy
Catalogues
Geomatics