On Thursday 28 November 2013, Stephen Woodbridge wrote: > Hi, > > I'm read over the documentation again and I am confused by the "Graph > representation" wiki page. > > I have a correctly noded graph in pgRouting. By this I mean that all > intersections have a node(s) at them and there are no unnoded intersections. > > One of the characteristics of this is the fact that segments at an > overpass/underpass intersection are not really connected because with > zlevel information we have assigned separate nodes for the over pass > node from the underpass node, in spite of the fact that they both have > the same 2D x-y locations (ie: they are separated in Z). > > The "Graph representation" page seems to imply that all segments with > shape points are exploded into multiple straight line edges with the > idea that crossing polylines with a common x-y point will become noded. > Is this true?
No. OSM has a topological data model, remember. We don't rely on points happening to share coordinates to tell whether they're connected or not. "layer" tags in OSM are purely cosmetic hints, disregarded from a routing point of view. robert. _______________________________________________ OSRM-talk mailing list [email protected] https://lists.openstreetmap.org/listinfo/osrm-talk
