Proj4J is a Java port of the popular PROJ.4 Cartographic Projection library.

Proj4J is hosted under the MetaCRS project at OSGeo. See the Proj4J home page for full details. This page is a summary of the information there.

Wagner VII Projection

Design Goals

Currently Out of Scope

The following features are not currently in scope. They could be added if development resources and interest are available.


The Proj4J SVN repository is currently hosted at the OSGeo Proj4J site:


The Proj4J codebase is based on a partial port of PROJ.4 carried out by JHLabs circa 2006. This port provided a large number of the PROJ.4 projections, but did not support some PROJ.4 features such as datum transformation.

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