* William Morris <wboyk...@geosprocket.com> [2012-05-31 21:25 -0400]: > 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
I share the reservations already expressed about the nodiness and blobbiness of the buildings. Here's one set of buildings, shown against Maryland's aerial imagery: http://static.aperiodic.net/tmp/md-mo-bldgs.png I'm not convinced that a county full of blobs like that will look good on the map and, thus, whether it would be an improvement over letting mappers put the buildings in as they get to them. I'm more comfortable with things like the building import done a few months ago around Salisbury in eastern Maryland where the data is much cleaner and, I think, better serves as a basis for further improvements from local mappers. I think that this level of accuracy, while reasonably-well-suited to landcover data, isn't really good enough for buildings. I'm also over in Baltimore County, so I'd like to hear what other regional mappers think. > Some steps I've taken to make it community-friendly include: > > - Removed all buildings that intersected existing OSM features Definitely an important step. Thank you. > - Removed all buildings smaller than 5000 square meters in area, since > those residential structures weren't being very well-detected anyway There's not really a good cutoff for this, though. I saw a couple of housing developments with blocks of townhouses where random sets of townhouses were missing. Presumably the missing ones fell below your threshold while most of the blocks didn't. It might be useful to go much higher and target just the largest buildings (which would also be the more significant landmarks). Over all of your data, what does the distribution of building areas look like? -- ...computer contrarian of the first order... / http://aperiodic.net/phil/ PGP: 026A27F2 print: D200 5BDB FC4B B24A 9248 9F7A 4322 2D22 026A 27F2 --- -- Go climb a gravity well! ---- --- -- _______________________________________________ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us
