= Welcome to '''''Proj4J''''' = [[TOC]] '''''Proj4J''''' is a Java library to transform point coordinates from one geographic coordinate system to another, including datum transformations. The core of this library is a port of the [http://trac.osgeo.org/proj/ PROJ.4] C library. The projection algorithms, concepts and coordinate system definitions are all taken directly from PROJ.4. These are wrapped in a Java class model which follows standard Java conventions and OO best practices. Proj4J is a part of the [http://wiki.osgeo.org/wiki/MetaCRS MetaCRS] group of projects, hosted by [http://osgeo.org OSGeo]. == Download == '''Status: Currently this library is still being created, and is not yet ready for download''' * The current development source is available via anonymous SVN from http://svn.osgeo.org/metacrs/proj4j. == Documentation == * The [http://trac.osgeo.org/proj/#Documentation PROJ.4 documentation] is the best reference for details of the coordinate system specification language, projection algorithms and supported parameters. * the [http://trac.osgeo.org/proj4j/browser/trunk/src/doc/Proj4J%20Version%20History.html?format=raw Version History] lists the evolution of features of the library == Mailing List == A mailing list is available for users and developers of Proj4J. Subscription, unsubscription and a web archive can be found at http://lists.osgeo.org/mailman/listinfo/proj4j. The mailing list archive is [http://lists.osgeo.org/pipermail/proj4j/ here]. == Development == * [wiki:DesignGoals Design Goals] * SVN repository: http://svn.osgeo.org/metacrs/proj4j. * Browse source [http://trac.osgeo.org/proj4j/browser here]. == Related Resources == * The PROJ.4 site has a [http://trac.osgeo.org/proj/#RelatedResources comprehensive list of resources] dealing with Coordinate Systems in general and the PROJ.4 library in particular.