On Tue, May 20, 2008 at 11:40 PM, Jeffrey Sharkey <[EMAIL PROTECTED]> wrote: > I'm stitching together the DOQQ satellite tiles gathered using the > USGS Seamless service, which have a 3.33% overlap. The DOQQ metadata > claims to be using NAD83 and GRS80 in UTM Zone 12. After stitching, > the satellite tiles look perfect. > > When I use Mapnik+OSM data to render tiles, they don't seem to line up > with any consistency when overlaid with the DOQQ images. Here is an > example of what I've come up with so far, where red outlines are > overlapping USGS tile boundaries, and green outlines are the Mapnik > tiles I generated. Also included is the Python code I'm using to > stitch everything together:
Two possibilities: - The OSM data comes from TIGER which is not always equally accurate. I would suggest first overlaying the OSM over yahoo maps using potlatch, that will tell you the quality of the OSM data. - Did you reproject the OSM data to match your output projection? I don't see any projections in your code, but perhaps you did it in the config file? Have a nice day, -- Martijn van Oosterhout <[EMAIL PROTECTED]> http://svana.org/kleptog/ _______________________________________________ Mapnik-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/mapnik-users
