Yes. That is a navigable aqueduct bridge. It is a structurally a viaduct with an aqueduct function on top. So how to map these two orthogonal properties of this bridge? I would map this as waterway=canal, bridge=viaduct, boat=yes, layer=x exactly as we do for a road bridge. If you want you can add bridge_type=aqueduct, but this is redundant, as we have already waterway=canal.
On 7 August 2014 19:06, Philip Barnes <p...@trigpoint.me.uk> wrote: > On Thu, 2014-08-07 at 17:53 +0200, Martin Koppenhoefer wrote: > > > > 2014-08-07 17:25 GMT+02:00 Richard Z. <ricoz....@gmail.com>: > > > > Wondering what to do with that? With just 687 objects > > worldwide the problem > > would be easily fixable.. just how? > > > > > > I think tagging the type of bridge as road attribute might be an > > exxageration. We should start mapping bridges as objects (area) and > > then add relevant detail like bridge typology to this. Maybe > > man_made=bridge? and bridge:type? This object could get further > > attributes so that they can be combined. Current bridge values (the > > road attribute) are a mess: > > http://taginfo.openstreetmap.org/keys/bridge#values > > > > viaduct > > 39 055 > > 1.76% > > ✔ > > A ''long'' rail, > > road, or other > > bridge made up of > > many short spans. > > no > > 6 987 > > 0.32% > > - > > > > suspension > > 2 035 > > 0.09% > > ✔ > > > > aqueduct > > 1 821 > > 0.08% > > - > > > > abandoned > > 776 > > 0.04% > > - > > > > culvert > > 734 > > 0.03% > > - > > > > swing > > > > > > > > "culvert" isn't a bridge type at all (in my understanding), neither is > > aqueduct. IMHO we should distinguish between different aspects (there > > is not 1 bridge typology, but there are more systems, e.g. by type of > > construction and construction material, by shape, by > > function/features, etc.). See also here for reference: > > https://en.wikipedia.org/wiki/Bridge#Types_of_bridges > > > > > > An aqueduct is definitely a type of bridge, i.e. one carrying a > waterway, usually a canal over a road, river or valley. > > The most famous, and scariest of them all > http://en.wikipedia.org/wiki/Pontcysyllte_Aqueduct > > Phil (trigpoint) > > > > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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