I'm not really clear on this myself, but I would suggest that a good way forward is to try to grasp things and spiff up the comments/docs.
There are several things out there: WMS : arbitrary areas and scales WMS-T : above, *usage* constrained to a subset TMS : really is tiles with specific 2^-k type alignment/size I think the OSM tiles are in 'google spherical mercator', which is certainly supported by proj (which viking doesn't seem to use), and is basically a mercator projection that assumes a spherical earth. http://docs.openlayers.org/library/spherical_mercator.html So I would ask: where is the code that turns lat/lon into spherical mercator coordinates to then bin them into tile indexes?
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