Unless I'm mistaken, I understand the zoom level (as in "way|z1-11") as "OSM TMS zoom level", right?
What about maps rendered in another projection than mercator/google, e.g. OSGB36, which is non-othogonal ? How is the implementation supposed to deduce the zoom level based upon a pixels per meters zoom level? Extreme, but I tend to think the zoom level namespace selector should be dropped altogether in favor of the "way|s5000" indicated as example in the specs, which is far more explicit. While, if needed, going to zoom level from a scale in the context of a mercator projection is easy for the implementation, I don't see how to go from zoom level to scale consistently for "exotic" projections, given the restrictive (assumed) definition of the zoom levels... - Chris -
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