Hi Tom, My query to Bjørn on his blog (that you referenced) relates specifically to his simplified version of the world shapefile. I can reproject it without trouble but multipolygons that cross the dateline are interpreted as taking the long way around the earth so you get some terrible looking shapes in a few places.
Luckily, I think your problem is much simpler and solvable. As far as I can tell there is just one big invalid polygon in the TM_WORLD_BORDERS-0.2.shp (the non-simplified download) that trips up even GDAL/OGR when attempting to reproject to Google Mercator. If I watch the debug output of mapnik when processing the shapefile I see the line: ' total shapes read=127' which should be '246' I can run ogrinfo on the shapefile to see how many multipolygon features should be processed: spring$ ogrinfo TM_WORLD_BORDERS-0.2.shp -so -al | grep Count Feature Count: 246 So then I try reprojecting the shapefile to google mercator using ogr2ogr, but I get this: spring$ ogr2ogr -t_srs EPSG:900913 tm_merc.shp TM_WORLD_BORDERS-0.2.shp Failed to transform feature 144. ERROR 1: Terminating translation prematurely after failed That feature is the Antarctica multipolygon and so I created a new shapefile with that feature stripped out (but maintaining the same projection since mapnik should be able to reproject on the fly now...): spring$ ogr2ogr -sql "select * from TM_WORLD_BORDERS-0.2 where Name <> 'Antarctica'" tm_sans_antarctica.shp TM_WORLD_BORDERS-0.2.shp If I run your exact setup (from https://lists.berlios.de/pipermail/mapnik-users/2008-June/000955.html) on the resulting, 245 feature shapefile, I get a correctly rendered map of everything except Antarctica. Do you have GDAL/OGR installed to test this? Is a world without the south pole still going to work for your purposes? Let me know, Dane On Jun 29, 2008, at 6:45 PM, Tom Carden wrote: > 2008/6/29 Artem Pavlenko <[EMAIL PROTECTED]>: >> Hi Tom, >> >> Try adding '+over' to SRS definitions >> Cheers >> Artem >> > > Hi Artem, > > You can see in my original mail I have +over in the srs of both the > Map element and the Layer element for the shapefile. > > I'm still stuck with this problem so if anyone else has successfully > reprojected the world borders shapefile from thematicmapping.org into > mercator using mapnik I'd love to hear how it's done :) > > Best, > > Tom. > _______________________________________________ > Mapnik-users mailing list > [email protected] > https://lists.berlios.de/mailman/listinfo/mapnik-users _______________________________________________ Mapnik-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/mapnik-users
