On Thu, May 31, 2012 at 9:25 PM, William Morris <[email protected]> wrote: > Howdy Folks, > > Trying this again, after a hiatus, here is a sample of a few hundred > buildings from a UVM-SAL land use classification. In this case it's > for an area just west of D.C. in Montgomery County, MD. I offer it for > your consideration before I pull the import trigger: > > http://dl.dropbox.com/u/23616645/Geosprocket_Share/mont_b_1.osm
Thanks for sharing. Spatial accuracy is pretty good for an automated process (worst I saw was 5m, usually more like 1 to 2m), though not as good as could be done (very laboriously) by hand given the resolution of the Bing imagery. I'd tend to say this shouldn't be uploaded en masse, but rather somewhat selectively, but I'll let the locals make that call. There a few issues I see which include: * Multipolygons aren't tagged with type=multipolygon, and the building=yes tags should be on the relation, not on the constituent (inner and outer) ways * AREA and PERIMETER should not be included as they can be calculated, and LandCover should not be included unless you can map it to a sensible (preferably already in use) tag, and since it's all 5 I'm guessing that's taken care of by building=yes * Ways are overnoded quite a bit, so run Douglas-Peucker first, experimenting with epsilon between 1m and 2m I've been slowly making improvements to the JOSM conflation plugin, with one goal being to facilitate the conflation of data like this with OSM. If you could provide a version of this file before excluding features which overlap existing OSM features, I'd like to try it out with the plugin to see if it produces useful results. Even better would be if you could take a look at the plugin yourself and suggest what enhancements would make it work for this use case. Note there are a few changes that aren't in the latest JAR available through JOSM. -Josh _______________________________________________ Talk-us mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-us
