The GeoTiff format is an extension of TIFF that provides geographic information as additional TIFF Tags in a normal TIFF file. The georeferencing information is encoded within the GeoTiff keys and refers to values found in the European Petroleum Survey Group (EPSG) tables of a few common cartographic projections.

The original tables, circa 1995, have a handful of problems when trying to process them. The curent tables are available as a MicroSoft Access v7 database from EPSG. The tables below are the original tables cleaned up and delimited by tabs rather than commas.

The first line of each file has column headings using the EPSG names. The second line is a short name for each field, or a reference to a field in another table: UNITS.code refers to the code field of the UNITS table. Hence these tables are suitable for conversion to a spreadsheet format.

CTRANS - Coordinate Transformations

DATUM - Reference Datums

ELLIPS - Ellipsoids

GEOGCS - Geographic Coordinate Systems

PMERID - Prime Meridians

PROJ - Complete Cartographic Projections

PROJCS - Projected Coordinate Systems

UNITS - Angular and Linear Units

VERTCS - Vertical Coordinate Systems