-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Nic Roets schrieb: > During rebuild, gosmore only mmaps the wayType data which is > roughly 1GB. During one stage, it iterates through the node data > and update the wayTypes they point to so that bounding boxes can be > computed. > > Nothing stops you from adding code to that stage that will test if > each node falls inside a polygon (e.g. place) and then modify that > way. > > I don't believe that writing software for adjusting speeds for > built-up places is worth all the effort. Reasons : * Place > boundaries can't be surveyed by OSM members. Can only be guessed > from aerial photos or imported from other sources. On every road (that's the points where it matters) there is a sign when you enter or leave a town. > * Applies to few countries. There are countries without different general speed-limits inside and outside towns? > * This extra info will seldom make a substantial difference in the > route proposed by the routing system, because all the roads will > typically go through the built up place. Very often I see rings of roads around a town, to divert traffic. Such a road being a primary-road is longer then the primary-road through the town but it is faster since you are allowed to drive at 2x the speed and get 3-4x the actual speed since there are no traffic-lights at all.
I guess this makes for a very high difference in a significant number of cases. Also think not only of the routing itself but the projected ETA. If will be horribly wrong without differentiating between roads in cities and outside. Marcus -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkj87owACgkQf1hPnk3Z0cT83gCg3HKXeml+DZ/w7yWBKWVSSAaC QosAniOyPhzCw42GSeyuJxxchIYw9xIx =DaE6 -----END PGP SIGNATURE----- _______________________________________________ Routing mailing list [email protected] http://lists.openstreetmap.org/listinfo/routing
