Chris Browet wrote: > 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...
Generally I like the zoom levels because they provide a handy logarithmic scale. I think for Kothic it is convenient to use the standard slippy map / google-mercartor tile scheme to map the zoom level. But I see no reason it has to be the same for all renderers. I will just use s = s_0 / 2^z with an arbitrary scale s_0. Sebastian _______________________________________________ Mapcss mailing list [email protected] http://lists.openstreetmap.org/listinfo/mapcss
