|Stable release||4.8.0 / March 13, 2012|
PROJ.4 is a library for performing conversions between cartographic projections. The library is based on the work of Gerald Evenden at the USGS, but is now an OSGeo project maintained by Frank Warmerdam. The library also ships with executables for performing these transformations from the command line.
- Warmerdam, Frank (13 March 2012). "PROJ 4.8.0 Released". OSGeo-Announce (Mailing list). Retrieved 20 March 2012.
- 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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