The existing data in OSM (imported from TIGER) for Webb County, Texas is really, really awful - if you want to see for yourself, visit http://www.openstreetmap.org/?lat=27.553&lon=-99.476&zoom=12&layers=B00FTF. Centerlines of streets are off by dozens of meters, bits and pieces of streets are missing, etc. (And that ignores the fact that all three borders - US, Texas, or Webb County - are misaligned with each other and none of them is actually right.)
Ideally it seems to me the best solution would just be to blow away the import and replace it with data from the TIGER Accuracy Improvement Project, but that hasn't reached Webb County yet in the public data. The TIGER 2007 shapefiles seem to be somewhat better than what's in OSM now, but still not as accurate as the existing commercial coverage and possibly still offset from reality - I haven't tried an overlay of the 2007 data with GPS tracks yet, but my guess is that it's not much better aligned. So the question is: should I (we?) just hold off on trying to fix things until the AIP data is available, and then just blow away the data and replace it? I know the TIGER import was a "one-off" but I'd imagine there are a lot of places like Webb County where nobody's touched the local data yet and the AIP data will be a much better baseline for future work (and also allow us to pull in the address data for geocoding, municipal boundaries, water features, etc. which didn't come in before). Chris _______________________________________________ Talk-us mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-us
