migurski/TileStache — pull request #39 by robpvn (2012-03-21 10:43:52+00:00)
Title: Fixed topology errors in sample data (world_merc.shp)

There were some topology errors in the sample shapefile, with non-noded self intersections in polygons. This worked fine in the Mapnik renderer, but when using the Vector tile renderer OGR would throw several errors. One side effect is that the logs were full of reported topology errors, somewhat more serious is that Canada disappeared from the world map as delivered by Tilestache because there were too many errors along the coastline there.

I fixed this by opening the shapefile in Quantum GIS, using the geometry inspector to identify errors, and giving the trouble spots very slight adjustments to correct the errors. Canada is now rendered correctly when using the example data with the Vector Provider.