ER> MR> I am not sure; maybe Melita Kennedy should answer that. ER> ER> Is she someone at ESRI ? Yes, she is a Sr. Product Engineer at ESRI, specializing in map projections and transformations. She is also a member of the OGP Geomatics Committee. She sometimes reads the Proj.4 mailing list, and she is very knowledgeable and helpful. Mikael