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As a port of an existing library, Proj4J has the same scope as its ancestor Proj.4 - to implement mathematical formulae for converting coordinates between different reference systems.  It narrowly focuses on converting individual coordinates; while this functionality can be used to implement conversions for higher-level structures such as raster and feature datasets, dependent projects are left to implement these operations themselves and Proj4J is not dependent on any specific representation of rasters or features.

The "native" representation of coordinate reference system parameters is the proj.4 parameter syntax, and facilities for interpreting other representations such as EPSG codes are within the scope for the project.

Creation Review2016-09-07