On Wed, 2010-12-01 at 00:00 -0500, Anthony wrote: > Anyway, I looked around at a few places labelled leisure=park, and the > usage is all over the place. I'd say based on that very unscientific > sample that it's probably best for routers to use a default of > access=unknown for leisure=park areas, and only use parks for short > cuts if they're explicitly tagged with something like foot=permissive. > > Alternatively, I guess it wouldn't be horrible to add something like a > highway=shortcut tag, so mappers could be explicit about it. If we've > gotta add foot=permissive by hand anyway, it's not that much more work > to add a few extra ways.
I was thinking of this issue last night while playing with my routing software. One issue I thought about which makes this difficult, is different shapes. If youre trying to route across a square area or any area which has a direct path from start to finish, routing in your method is easy. But I was thinking, what happens if youve got an L-shaped park or even a U-shaped park. +-----+ +-------+ | | | | | | | +-C-+ | A | | B A | | | | B +-----+ +-+ +-+ Do you cross the open part of the area in the second example, in a straight line from A to B? Do you form an arc? Do you simply go from A to B, but go around the edge near C? As an area is unlikely to be a perfect oblong, this situation may arise more often than one would think. David _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
