Igor Brejc schrieb: > Hi all, > > I've added slippymap-like rendering directly into Kosmos GUI (it will be > available in the next version, probably within a week). Anyway, I've > noticed that there is an discrepancy between Kosmos rendering and tiles > generated by Mapnik (and Osmarender). All the stuff Kosmos renders is > offset slightly towards the north (or south, depending on the > hemisphere).
> I've double-checked my math and cannot find what could be wrong. I'm > assuming that Mapnik and Osmarender use spherical Mercator projection > (and not elliptical). Possible explanations: > 1. My projection math is wrong > 2. There is a difference between .NET math calculation and that of > Mapnik's C++ > 3. I use double precision, while others use plain float? > 4. ...? What do you use to calculate the maxX (trivial) and maxY coordinates for the tiles? There might be a hidden rounding error. All projection code used for [EMAIL PROTECTED] is in svn: http://svn.openstreetmap.org/applications/rendering/tilesAtHome/lib/tahproject.pm > Any help would be appreciated. -- Dirk-Lüder "Deelkar" Kreie Bremen - 53.0952°N 8.8652°E _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
