It is simply for historical reasons: the initial implementation of the
forward/inverse methods from the MapBuilder project used the GCTPC code
as a base because it was easier to port. In theory they should give the
same result but I've converted one or two of those to the PROJ4 code
base because they had different algorithms for spherical/elliptical
spheroids.
Mike
Martin Davis wrote:
> Proj4js appears to have some projection algorithms taken from GCTP,
> rather than PROJ4. I'm curious about the reason for this. Are they
> more accurate? Or easier to port or maintain?
>
--
Michael Adair
Senior Software Architect
DM Solutions Group Inc.
Office: (613) 565-5056 x26
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