-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 David MENTRE wrote: > Hello, > > While playing with routing is OSM map, I have observed that the OSM map > is not fully connected if you consider only the routable ways[1]. For > example, the map or Rennes city, France[2] appears to be made of 3335 > ways divided into 8 different connected components. > > With such a divided map, sometimes there is no route between two points > if those points are in two separated components. > > Has anybody any idea how one should handle this? > > * Should I consider having a bug in my program? (not entirely excluded > ;-) For example, a bad interpretation of way attributes; > > * Is this a "bug" in the OSM data (error made by people or lack of > enough data)? > > * In the above case, are other routing programs (e.g. recently > announced Gosmore) using some kind of "tricks" to join the separated > components (e.g. consider two way points so close that they are the > same point)? > > Sincerely yours, > david > > Footnotes: > [1] Ways with the "highway" attribute with following values: > | Motorway > | Motorway_link > | Trunk > | Trunk_link > | Primary > | Primary_link > | Secondary > | Tertiary > | Unclassified > | Track > | Residential > | Living_street > | Service > > [2] > http://www.openstreetmap.org/?lat=48.1157&lon=-1.6625&zoom=13&layers=B0FTT >
Hi, I had a quick look at the city in JOSM & found only one typical Potlatch node-not-connected-to-way junction; many (440) overlapping ways though, most of which are areas - I haven't been over these to see if any are streets not connected right. Took out most of the crossing-way errors, but they're mostly waterway & tunnels. It all looks pretty connected to me! Also a quick Pyroute across the town worked fine. Are you using capitalised values for highway as written above? Mark -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFILSpzJfMmcSPNh94RAmzYAJ40gZR1XHdO36Id/C/3mR+XR2NT0gCfZDzl FyJ4lbqvz6rauvKEvu8pFsQ= =bL9P -----END PGP SIGNATURE----- _______________________________________________ Routing mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/routing
