The EPSG Geodetic Parameter Dataset

The EPSG Dataset

The IOGP's EPSG Geodetic Parameter Dataset contains many definitions of coordinate reference systems and coordinate transformations which may be global, regional, national, or local in application. It is maintained by the Geodesy Subcommittee of the IOGP Geomatics Committee. The EPSG Dataset is a vital resource for ensuring accuracy and consistency in defining spatial locations using coordinates, as highlighted on the Geodetic Awareness page.

The EPSG Dataset is the de facto standard in the geospatial industry, initiated in 1985 and first made public in 1993. For more information about its content and usage, refer to the History of the EPSG Dataset and Guidance Notes under “Support Documentation”.

EPSG Dataset Change Request

To request changes to the EPSG Dataset use EPSG Dataset Change Request Help. Recent changes to the data can be viewed in the EPSG Dataset Release History. 

Registration

To gain access to the EPSG data through these web pages you must agree to the Terms of Use by registering on this site. Once logged in, you will have access to additional functionality and may also manage your account including your subscription to EPSG updates.

To register, you must enter your email address (visible to IOGP) and password (not visible). This information is not used outside this site, nor is it passed on to any third party.

Click here to register.

About this site

The IOGP GeoRepository site contains the authoritative EPSG Dataset. Its data model follows the ISO 19111:2019 international standard for referencing by coordinates, including its provision for dynamic datums, geoid-based vertical datums, datum ensembles and derived projected coordinate reference systems. EPSG Dataset versions 10.0 and later follow this data model. It is generally backward compatible with the previous 19111:2007 data model but has some modifications and additional elements (see the overview of the data model changes).

EPSG Dataset versions v10.003 in the 2019 model and v9.9.1 in the 2007 data model released in September 2020 contain the same data. Both are available from the Dataset Archives. Subsequent data releases are being made only in the new data model.

GeoRepository API

Software developers can find the RESTful GeoRepository API description in swagger.

The EPSG Registry API User Guide provides assistance to computer application developers who wish to use the RESTful API of the EPSG GeoRepository to query and retrieve entities and attributes from the Dataset. 

See also the Open Geospatial Consortium (OGC) standard syntax for a resolvable http URI string, which also explains how to construct hyperlinks to epsg.org reports using EPSG codes.