When overlaying OSM with the recently available TIGER 2007 shapefile data for Census Blocks in Alameda County (California), I'm encountering both an offset and difference in relative position of the linework. In short, OSM's data looks a lot more accurate and consistent -- streets that should be straight actually look straight in OSM, but often zig-zag in the TIGER 2007 edges and tabblock shapefiles. For a visual, visit: http://www.giswebsite.com/demos/tiger_overlays.html
Any observations or ideas about where the misalignment might come from? Though it smells partially like a datum problem, that path hasn't yielded any solutions yet. Thanks, Jonathan _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
