2010/7/23 Chris Browet <[email protected]>: > > On Fri, Jul 23, 2010 at 01:18, Komяpa <[email protected]> wrote: >> >> 2010/7/20 Chris Browet <[email protected]>: >> > Unless I'm mistaken, I understand the zoom level (as in "way|z1-11") as >> > "OSM >> > TMS zoom level", right? >> You may understand it that way if you want to. > Yo mean the interpretation is up to the implementer? It might be difficult > to have consistent maps for a given style this way... Everything is up to implementer for now. You may understand that as OSM TMS zoomlevel (EPSG:3857), I may read that as ScanEx TMS zoomlevel (EPSG:3395). They're no more than 0.7% different however :)
>> I guess defining that equator length on z0 is 256 pixels (.26 mm per >> pixel) should be enough. Or, we may leave that up to implementer. > Again, we'll loose consistency if we don't define it in the specs/leave it > to the implementer. "Please try to match zoom levels to EPSG:3857 tiles" might be a good remark in spec. Applying this thing backwards might help: http://svn.openstreetmap.org/applications/rendering/mapnik/zoom-to-scale.txt > And defining a scale in terms of "tiles" would be very, very > abstract/bizarre for people not knowing mapnik/TMS. Who in OSM doesn't know about tiles? :) > The only generally "recognized" zoom levels are map scales (e.g. 1:5000) > which are clear and precise for everyone. When you buy a printed map, the > scale is not defined by a zoom level ;-) That's why we have "z15 detailed" mark on maps we print in our company ;) -- Komяpa aka Darafei Praliaskouski xmpp:[email protected] mailto:[email protected] _______________________________________________ Mapcss mailing list [email protected] http://lists.openstreetmap.org/listinfo/mapcss
