> > I want to talk about this page on the wiki describing how to map tunnels > > correctly: > > http://wiki.openstreetmap.org/wiki/Tunnel#How_to_Map > > > > Especially the last paragraph causes headaches to me: > > "If the tunnel ends in a junction you'll need a small un-tunneled way > > between the end of the tunnel and the junction" > > > > > > Where does this rule come from? > > > 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; otherwise we wouldn't connect the incoming ways at a crossing, because they end at the edge of the road, not in the middle. But I agree that in most cases there is a short way between the T junction and the tunnel/bridge, although I have encountered cases where a bridge started directly at the other road (give or take a few millimeters). I think we should insert a "in most cases" into this rule. Regards, Marc -- Jetzt kostenlos herunterladen: Internet Explorer 8 und Mozilla Firefox 3 - sicherer, schneller und einfacher! http://portal.gmx.net/de/go/atbrowser _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
