Welcome to Proj4J

Proj4J is a Java library to transform point coordinates from one coordinate system to another, including datum transformations.

The core of this library is a port of the popular ​PROJ.4 C library. The basic algorithms, concepts and coordinate system definitions supplied by PROJ.4 have been exposed via a class model which follows standard Java conventions and OO best practices.

Proj4J is a part of the ​MetaCRS group of projects, hosted by ​OSGeo.

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The current development source is available by anonymous SVN from ​http://svn.osgeo.org/metacrs/proj4j/trunk.