On Fri, Jul 24, 2009 at 08:40:46AM -0700, Mikel Maron wrote: > Hi > > I'm generating maps for Burning Man this year, and am getting anomalous, > single colored tiles. > > You'll see one in the upper right on the link below; > and if you zoom in and pan around the pentagon (that's the fence) you'll see > more. > > http://rockburger.com/bman/slippy.html > > The pentagon is tagged as an administrative boundary in OSM, but it also > happens with other polygon objects. > It seems that these colored tiles occur when the tile only barely intersects > polygons. > > Has anyone seen anything similar? Some suggestions for debugging?
My guess is that you're quantizing to a limited number of colors; looks like 16? at least for http://earthdev.burningman.com/osm_tiles2/14/2767/6155.png . What is likely happening is that the quantizer is making a silly choice about what colors to include in the final image when it can't include all of them due to antialiasing or some such. You might up the color palette size of you quantizer, if you can? Or at least try without quantizing and see if you get any farther? Regards, -- Christopher Schmidt MetaCarta _______________________________________________ Mapnik-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/mapnik-users
