Another issue with ellipsoidal (geodetic) calculation is the whole date line/poles wrapping issue. This is a major pain to deal with. I guess local projections can be used to deal with this as well, though.

Seems like it would be nice to have a library that would automatically choose the best projection, do the transformation, compute the result, and untransform...


--
Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022

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