OpenStreetMap
I've been plugging away at improving the roads in Vancouver Washington. First, I'm surprised at how big that area is. Second, I find a lot of the TIGER data is "off by one" or shifted/compressed compared to the aerial imagery.
I've found the combination of NAIP imagery and JOSM works quite well for this. JOSM lets me select several point for moving which is way more efficient than Potlatch. The detailed Yahoo! imagery is the best, but it's old and the level of detail drops off a lot outside the big cities.
Абмеркаванне
Камэнтар Peter Dobratz ад 22 Кастрычнік 2010 у 14:35
You can also try USGS imagery (public domain). Enter the following service URL in the JOSM WMS plugin configuration:
http://imsortho.cr.usgs.gov:80/wmsconnector/com.esri.wms.Esrimap/USGS_EDC_Ortho_Washington?
It often has greater detail than Yahoo and NAIP (though it may be a few years old as well).
Камэнтар Baloo Uriza ад 25 Лістапад 2010 у 20:15
The City of Fort Vancouver has no urban growth boundary, so despite having a population roughly the size of Beaverton, it sprawls on and on like Tulsa. I just plain don't have anything nice to say about the abysmal quality of TIGER. For most of the country, it seems like we would have been better off NOT importing TIGER.