the water is tunneling under the road, through a narrow passage. It's not the road that goes through a tunnel.
2018-03-01 17:40 GMT+01:00 Vao Matua <[email protected]>: > Thank you all for the explanations. > I think that my issue might have to do with UK English usage. I would > never call a road tunnel a "culvert", I typically only work and map in a > rural setting and a culvert is only a passage way for water, and is only > used at a road or path crossing. > > While a ford is something shared by a road and a stream one is still under > the other, but the rules for rendering assume that the road is underneath. > In the OSM ford wiki <https://wiki.openstreetmap.org/wiki/Key:ford> one > photograph shows the path on top of the ford using the stepping stones. > The Wikipedia <https://en.wikipedia.org/wiki/Culvert>reference cited on > the OSM culvert wiki > <https://wiki.openstreetmap.org/wiki/Tag:tunnel=culvert> only shows > stream examples. > Therefore, why not have a rendering rule for culverts in the same way > there is a rendering for a ford? > > This has been an interesting thought process and I'm probably just lazy > not wanting to split a watercourse twice and add a tag to the way as > opposed to snapping a road or watercourse node and adding a tag to the node. > > Keep mapping > > On Wed, Feb 28, 2018 at 5:11 PM, Dave Swarthout <[email protected]> > wrote: > >> >If 2 ways share a node, then they must be connected to each other. ie on >> the same layer. So one can't be above/below the other. A road and a stream >> crossing on the same layer is a ford. >> >If you tag the shared node as a tunnel, then you don't know which way >> goes through the tunnel. Does the stream go through a tunnel, or does the >> road go through a tunnel, or both? >> >> >It is much more useful to map tunnels/bridges as a way. If you know >> there is a tunnel, but don't know how long the tunnel is, you can estimate >> it. ie based on the width of the road. You can add a note to say the exact >> >length/position is estimated >> >> Excellent explanation. Agree totally. >> >> On Thu, Mar 1, 2018 at 7:48 AM, Craig Wallace <[email protected]> >> wrote: >> >>> On 2018-02-28 23:21, Vao Matua wrote: >>> >>>> François >>>> >>>> I don't have an example. I was trying to think of an example where >>>> layer would be needed for a stream/road crossing. A pipe would probably be >>>> a better example. >>>> >>>> Sorry to cause a distraction. >>>> >>>> My real question is "Why not allow tunnel=culvert to be a node?" >>>> >>>> Emmor >>>> >>> >>> If 2 ways share a node, then they must be connected to each other. ie on >>> the same layer. So one can't be above/below the other. A road and a stream >>> crossing on the same layer is a ford. >>> If you tag the shared node as a tunnel, then you don't know which way >>> goes through the tunnel. Does the stream go through a tunnel, or does the >>> road go through a tunnel, or both? >>> >>> It is much more useful to map tunnels/bridges as a way. If you know >>> there is a tunnel, but don't know how long the tunnel is, you can estimate >>> it. ie based on the width of the road. You can add a note to say the exact >>> length/position is estimated. >>> >>> >>> _______________________________________________ >>> Tagging mailing list >>> [email protected] >>> https://lists.openstreetmap.org/listinfo/tagging >>> >> >> >> >> -- >> Dave Swarthout >> Homer, Alaska >> Chiang Mai, Thailand >> Travel Blog at http://dswarthout.blogspot.com >> >> _______________________________________________ >> Tagging mailing list >> [email protected] >> https://lists.openstreetmap.org/listinfo/tagging >> >> > > _______________________________________________ > Tagging mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/tagging > >
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