Design Goals

• Rely on PROJ.4 for the definition of all projection and datum conversion algorithms
• Maintain compatibility with PROJ.4 for
  • the coordinate system specification language
  • resources such as the database of coordinate systems, datum conversion grids, etc
• Software design follows well-established Java patterns and best practices
• Software architecture is as simple as possible and easily maintainable
• 100% pure Java (no native code)
• Target platform is Java 1.5 (with a high degree of 1.4 compatibility)
• Minimal dependency on external libraries
• Execution is efficient for performing bulk coordinate transformations
• Support datum transformations
• Support as many PROJ.4 parameters as possible
• Error handling is via well-documented Java exceptions
• High quality, informative Javadoc
• Provide a set of unit tests to validate the API functions
• Support the emerging MetaCRS Common Test Format database
• Provide additional tools such as:
  • A GUI to create, inspect and execute Coordinate System definitions
  • A GUI to visualize projections on the globe

Currently Out of Scope

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

• Support for mappings to other Coordinate System representations and authorities (e.g. such as OGC WKT, the various spatial database formats, etc)