[Tagging] Culverts and Fords

[Dave Swarthout]

 >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 <craigw84+osm at gmail.com>
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.
>
>
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> Tagging at openstreetmap.org
> https://lists.openstreetmap.org/listinfo/tagging
>



-- 
Dave Swarthout
Homer, Alaska
Chiang Mai, Thailand
Travel Blog at http://dswarthout.blogspot.com
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