* Eric H. Christensen <e...@christensenplace.us> [2012-12-11 21:24 -0500]: > Is there a good way to make the PGS-sourced data match the Tiger data in > certain areas to improve the accuracy?
If you use JOSM, the ContourMerge plugin is very helpful here. You can select nodes on each of the TIGER and PGS ways near where they diverge from each other and then drag the coastline onto the administrative boundary. Be aware that both the TIGER and PGS imports periodically split ways to keep them from getting too long, so you might have to do the merging in several places along the full length of the overlap. Even the TIGER data isn't perfect (though it's far better than PGS, at least in Maryland), so what I like to do it use the JOSM ImproveWayAccuracy plugin to align the administrative boundary to aerial imagery and then use the ContourMerge plugin to overlap the coastline ways. If there's no administrative boundary, I just use the ImproveWayAccuracy plugin on the coastline ways directly. On a side note, Anne Arundel County is kind enough to put their geodata into the public domain, plus they've got an ArcGIS REST server at http://gis-world.aacounty.org/ArcGIS/rest/services/ . I find their basemap, parcel, and orthoimagery layers to be very useful (although JOSM can't use them directly, as far as I know; I use tilestache to go between JOSM's tile underlays and the ArcGIS REST interface). _______________________________________________ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us
