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Developer(s) Gerald Evenden
Stable release 4.8.0 / March 13, 2012 (2012-03-13)[1]
Written in C
Platform Cross-platform
Type Library
License MIT

PROJ.4 is a library for performing conversions between cartographic projections. The library is based on the work of Gerald Evenden at the USGS,[2] but is now an OSGeo project maintained by Frank Warmerdam. The library also ships with executables for performing these transformations from the command line.


  1. ^ Warmerdam, Frank (13 March 2012). "PROJ 4.8.0 Released". OSGeo-Announce (Mailing list). Retrieved 20 March 2012. 
  2. ^ Gerald I. Evenden (24 September 1995). Cartographic Projection Procedures for the UNIX Environment - A User's Manual. p. 67. Retrieved March 20, 2012. 

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