On Mon, Apr 9, 2012 at 1:25 AM, Gregory Arenius <greg...@arenius.com> wrote: > > > >> Yes, I see a lot of water features that are just not corroborated by the >> aerial imagery, which could mean one of at least three things: >> 1) The aerial imagery is out of date >> 2) The NHD data is out of date >> 3) The NHD data represents something I don't understand (the future, a >> temporary situation (which should not be in OSM), something underground?) >> > > Some of the water features in NHD are also seasonal, although that is > usually tagged in the data. Also irrigation canals are often just ditches > and can be hard to identify from aerial imagery especially the smaller ones > as they aren't always in use. > > The tags on a lot of those features have some gnis:type tags that say > ditch-canal or something like that but the OSM tag is just canal which > doesn't really do a great job describing the situation exactly. > > I agree, though, the data you pointed out looks pretty odd, especially the > square shapes. > > I'm surprised that NHD has data that includes irrigation ditches as small as > some of the ones noted above. Anybody know how they gathered all of that > data? > > Greg
I saw some odd water features along the coast in California as well when I was remapping coastlines by importing some NHD data. I don't have a link handy but I think it came from a California specific data source and some of the ways didn't have any OSM renderable tags. Yay for imports? Toby _______________________________________________ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us
