[Tagging] Culverts and Fords

[Jo]

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 <vaomatua at gmail.com>:

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