I've been having the same problem as Tom, and I can confirm that excluding Antarctica seems to fix the problem.
-mike. On Jun 29, 2008, at 9:22 PM, Dane Springmeyer wrote: > 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 > ---------------------------------------------------------------- michal migurski- [EMAIL PROTECTED] 415.558.1610 _______________________________________________ Mapnik-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/mapnik-users
