Another possible scenario is a junction point between two elevated ramps, above a junction point between two surface roads. Since we live in a three-dimensional world, nodes with the same latitude and longitude, but different elevations, should not be considered to refer to the same point in three-dimensional space.
-------Original Email------- Subject :Re: [OSM-talk] Postmortem analysys >From :mailto:[email protected] Date :Sat Jan 08 19:54:06 America/Chicago 2011 On Sat, 2011-01-08 at 20:27 -0500, Nathan Edgars II wrote: > On Sat, Jan 8, 2011 at 8:25 PM, David Murn <[email protected]> wrote: > > On Sat, 2011-01-08 at 17:17 -0800, Nathan Edgars II wrote: > >> > >> If the name or ref is different on either side of the state line, then it > >> needs to be split in the middle. > > > > Thats fine, but does the state line need a node directly on-top of the > > road? Does the state line change as it crosses over the road? If not, > > then you dont need a node on the state line at the same point as the > > road, which means the duplicate node problem doesnt exist. > > That's why I specified a double-decker bridge: each deck gets split at the > line. I guess in theory, having a double decker bridge, directly over a state line is possible. But why write routers for the one case thats theoretically possible, instead of the millions that are not only possible, but already in existance? David _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk -- John F. Eldredge -- [email protected] "Reserve your right to think, for even to think wrongly is better than not to think at all." -- Hypatia of Alexandria _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
