> >> this might be a logical topic: we are mapping the center of the road. > >> The tunnel can not end at the center of the crossing road, because > >> this road itself is not a tunnel. (you will have at least half the > >> width of the crossing road untunneled). > > > > No, IMO we're mapping the entire road, but represent it by a line > located at the middle. This is a subtile but important difference; > > yes, I agree with this, but it doesn't IMHO extend the tunnels beyond > their real extension. I personally wouldn't think: "the tunnel starts > right at the crossing and therefore I map it like this", but I would > rather think: "the tunnel starts at this projected point that is half > the width of the crossing road away". > > > otherwise we wouldn't connect the incoming ways at a crossing, because > they end at the edge of the road, not in the middle. > > why not? Who tells you that the road ends at the edge and not in the > middle? If both roads continue on both ends, would you say that the > center (crossing) belongs to neither road because they both end at the > edge? I would say it belongs to both roads.
Maybe not in all cases, but have a look at this example: http://maps.google.com/maps?f=q&source=s_q&hl=de&geocode=&q=bayreuth&sll=37.0625,-95.677068&sspn=59.467068,107.138672&ie=UTF8&ll=49.935936,11.646567&spn=0.000375,0.000817&t=k&z=21 It'd be hard to argue that the incoming track does not end at the edge of the road, but goes on to the middle. Regards, Marc -- GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT! Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01 _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
