EPSG.io: Find Coordinate Systems Worldwide

Published March 14th, 2014

Find EPSG coordinate systems worldwide

We are pleased to announce a new open-source web service with a database of coordinate systems used in maps worldwide.

UPDATE: We released an API for batch maps and geodata transformation. For details, visit the API documentation page.

EPSG.io simplifies the discovery of coordinate reference systems utilized all over the world for creating maps and geodata and for identifying geo-position. It is a practical tool for anybody interested in cartography and digital map making who needs to know exact latitude and longitude values for numerical coordinates in different spatial reference systems. The map application allows us to show the precise location anywhere on the planet also visually.

The website comes with a fulltext search indexing over 6000 coordinate systems. The search starts by typing the name of the system, name of covered country, state or any of the combinations of these. Searching for EPSG and ESRI codes is supported as well.

Each coordinates system and transformation has a short permanent link and is exportable in various formats (WKT, XML, OGC GML, Proj.4, JavaScript, SQL).

Soon, this functionality will be used by MapTiler Engine to simplify the transformation of existing raster geodata and images into Google Maps and OGC WMTS-compatible tiles. MapTiler is the easiest way how to prepare custom maps for mobile devices and web presentations.

Georeferencer, the online service for turning scanned maps into geodata in a web browser, will soon utilize EPSG.io service as well - allowing a user-friendly selection of any coordinate system and map projection during the georeferencing process.

The EPSG.io website is built around the official EPSG database maintained by the OGP Geomatics Committee. The database comprises very detailed geodetic parameters from a range of sources and authorities. EPSG.io simplifies access to exact parameters for thousands of spatial reference systems, transformations and conversions, datums, ellipsoids, meridians, units, etc.

The whole project is open-source - with complete source code available on GitHub. Contribution from the online community is very welcome. New features, fixes of bugs, and additional functionality can be easily developed by anybody who is interested in the improvement of the system.

The web supports the OpenSearch protocol. In Chrome web browser, it is possible to type into the address bar “epsg.io” then <tab> and your search phrase. Firefox can add the system to the list of supported search engines as well. The website is available as a Google Chrome OS application. The website availability and performance are improved by a CDN with over 20 caching servers worldwide. 

The initial version of this open-source project has been developed by the Moravian Library in Brno, Czech Republic, thanks to support from the Programme of Applied Research and Development of the National and Cultural Identity (NAKI) from the Ministry of Culture of the Czech Republic, project No. DF11P01OVV003 - TEMAP - Technology for access to Czech map collections: methodology and software for protection and re-use of national cartographic heritage.

The main features

  • Fulltext search for the complete database of coordinate systems from EPSG
  • Short rememberable URLs, i.e., https://epsg.io/4326 
  • Type GPS latitude/longitude and get projected coordinates or vice versa
  • Precise numerical location on a map / aerial photo for any place on the planet
  • Export definitions in various formats, including WKT, OGC GML, XML, Proj.4, SQL, JS, etc.
  • Facets for retrieval of alternative record types from the official EPSG database
  • API for the search in the EPSG database and for transformations

Frequently answered questions

How does the system differ from spatialreference.org and epsg-registry.org?

It is much easier to find the coordinate systems (for example, query “utm wgs norway” gives a list of all UTM zones with WGS covering the area of Norway). All available transformations for the selected coordinate reference systems are visible and applicable (it is possible to find an alternative 7-parameter transformation for Proj4js replacing a default grid transformation or choose a transformation with higher accuracy for a selected area). Preview location for any numerical coordinates on a detailed map - with copy&paste functionality. The complete EPSG database with codes for datums, units, transformations, etc., is indexed and searchable, and the individual EPSG records are linked from every detail page.