Ok fly, sorry for this sidetrack on the main thread ;) Nevertheless, +1 for separating structures (bridges, tunnel) from features (roads, rails, ...).
But all this (tunnels, bridges, culverts) need a better support of layering and extra attributes like elevation beside lat & lon. *François Lacombe* francois dot lacombe At telecom-bretagne dot eu http://www.infos-reseaux.com 2013/9/30 fly <lowfligh...@googlemail.com> > Am 30.09.2013 18:19, schrieb Martin Koppenhoefer: > > > > 2013/9/30 Philip Barnes <p...@trigpoint.me.uk <mailto: > p...@trigpoint.me.uk>> > > > > And canal tunnels, there is usually a towpath through the same > > tunnel, but we have to map them as separate tunnels, then there are > > double track railway tunnels. > > > > > IMHO this is the same as for bridges: we don't have a general standard > > how to map a bridge or a tunnel, all we (there are exceptions, speaking > > about the general consensus how "normal" mapping is done) currently do > > is attaching an attribute to a road (or sth. else) stating that it is on > > a bridge or in a tunnel, but we do not map the bridge or tunnel itself. > > > > The solution could be a bridge object or a tunnel object (could be > > either geometry or a relation) which would represent the actual > > structure, would get tags like name (name of the bridge / tunnel, not of > > the road, i.e. goodbye bridge_name), and so on. In the case of geometry > > this would be an area outlining the feature, in the case of relations I > > think there is already a proposal, but not very much used. > > Sure, man_made=bridge/tunnel for the outline and bridge/tunnel relation > which are often both needed. > > fly > > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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