On Tue, Nov 30, 2010 at 5:22 PM, David Murn <da...@incanberra.com.au> wrote: > On Tue, 2010-11-30 at 11:43 -0500, Anthony wrote: >> On Tue, Nov 30, 2010 at 11:29 AM, David Murn <da...@incanberra.com.au> wrote: >> > On Tue, 2010-11-30 at 15:30 +0000, Ed Avis wrote: >> >> As a rough rule, leisure=park and landuse=grass could be considered >> >> walkable, >> >> unless tagged access=no or access=private. >> > >> > You may also find timed access restrictions apply. Some parks here for >> > example, are gated off at night, which again may affect vehicle/bicycle >> > traffic but not foot traffic, or it may affect everything. >> >> Fortunately, there are tags for all of this: >> >> http://wiki.openstreetmap.org/wiki/Access#Transport_mode_restrictions >> http://wiki.openstreetmap.org/wiki/Access#Access_time_restrictions >> http://wiki.openstreetmap.org/wiki/Barrier > > Thats great, what happens if someone traces the park from aerial > imagery, and doesnt know/care about any of those? Or for that matter, > if someone tags it on-the-ground, but doesnt add all the details?
Then the mapping will be incomplete until someone else comes along and fixes it. Same as what happens if, for instance, someone traces a street from aerial imagery and doesn't know/care about the one-way tag, or the "no motorcycles" restriction. > What defautls should routers use? Should they assume all parks are flat > and walkable, or should they assume theyre fenced, or that theyre 'stay > off the grass' or 'stay on the grass' or what? Personally, I'd assume that they're (relatively) flat and walkable. >From the wiki: "A park. Open, green area for recreation, usually municipal. These are outdoor areas, typically grassy/green areas, set aside of leisure and recreation. Typically (or pretty much always) open to the public, but may be fenced off, and may be closed e.g. at night time." > This is the problem. A way on the map, shows there is a right of > passage. If theres no way in an area, it might mean the area is > passable, but it might also mean it hasnt been mapped. Hence, the > safest option is to not route unless theres a right of way to follow. That's nonsense. A way does not show a right of passage. A particularly tagged way shows a right of passage. And a park is a particularly tagged way. _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk