[Tilecache] Convert Spherical Mercator coordinates to Lat/Lng?

[chris marx]

Hi,
 I've got the TileCache TSM service working (thanks to the list for tips!),
but unfortunately, my WMS does not support the "Spherical Mercator"
projection. For the moment, i rewrote the wms service to switch up the espg
and coordinates from tilecaches's tsm request and converting them to
lat/lng, so that at least the WMS request will go through, but I assume a
standard mercator projection to do the conversion (which is obviously
wrong). Since my GIS/WMS doesn't support this projection, does anyone have
the necessary code to convert coordinates from the spherical mercator to
lat/lng?
Thanks!

-- 

Chris Marx
Programmer/Analyst
Cornell Lab of Ornithology
159 Sapsucker Woods Rd.
Ithaca, NY 14850
t. 1.607.254.1142
http://www.birds.cornell.edu/
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