The European Petroleum Survey Group (EPSG; now defunct, and superseded by the OGP Surveying and Positioning Committee) created and maintains a spatial reference database, assigning EPSG code numbers to spatial reference systems (combinations of coordinate systems, projections, and datums). There really is no way to figure out the spatial reference system from just the code number alone, or vice versa, so you need to look them up. The official database is in Microsoft Access format, not terribly easy to use; the code list in tabular format isn’t much better. There’s now a convenient online version of the database, searchable by keywords or code number. You can then access additional information for that spatial reference system in a number of different formats:
- Human-Readable OGC WKT
- Proj4
- OGC WKT
- JSON
- GML
- ESRI WKT
- USGS
- MapServer Mapfile
- PostGIS spatial_ref_sys INSERT statement
Users can also upload their own spatial reference definitions, which I suppose is a good thing as long as you exercise caution in using them.
Other posts in the Coordinate Converters series
- Coordinate Converters I - NAD Conversions
- Coordinate Converters II - Worldwide Coordinate Conversion
- Coordinate Converters III - Two Freeware Converters
- Fast Lookup Of The State Plane Coordinate System ID For Any US County
- Handy Online Lookup Of EPSG Coordinate System Codes
- Natural Area Coding Tool For Google Earth
- MGRS/UTM/Latitude-Longitude Converter
- Degree-Minute-Second To Decimal Degree Converter
- More Degree-Minute-Second Converter Options
- Reprojecting Raster Imagery I
- Reprojecting Raster Imagery II - ERDAS Viewfinder
- Additional ERDAS Viewfinder Utilities
- Options For MGRS Coordinate Conversion And Viewing
- Projection Parameters / Point-Of-Origin For State Plane Coordinate Systems (SPCS)
- Spreadsheet Tools For Lat/Long, MGRS and UTM Coordinate Conversions
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