[Proj] Custom projection wildly inaccurate
gdt at ir.bbn.com
Mon Nov 20 08:36:24 EST 2006
> There seem to be several approximations. Most straight (read:
> what you can do per proj/cs2cs command line alone) projective
> approximations are bad.
> There is really only one way to do it correctly: use the
> official polynomial solution.
Yes, but that's not easily translatable for use in Proj-based
applications like GDAL and MapServer (as far I know, at least).
We will most likely have to convert the data manually, but in
the meantime it would be nice to have a bad-and-fast projection
for demonstration and testing purposes.
One thing that would work, but perhaps set a bad precedent, is to
define a new projection in the proj source, that knows the
polynomials. This would be a particular transform, rather than a
generic projection with parameters. Alternatively, there could be a
polynomial transform with vast numbers of parameters.
Greg Troxel <gdt at ir.bbn.com>
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