[Tagging] Feature Proposal - RFC - Couloir

[Volker Schmidt]

>From the photos on duck duck go, it seems that these couloirs are steep
valleys with steep walls which become couloirs in winter.when they are full
with snow.

Apart from that it seems that in French "couloir" as geographic feature
describes an avalanche channel (couloir d'avalanche).
In the French term "couloir" used in German means something similar to the
French original:
" Ein *Couloir* (französisch
<https://de.wikipedia.org/wiki/Franz%C3%B6sische_Sprache> für *Korridor*)
ist eine von Felsen <https://de.wikipedia.org/wiki/Fels> begrenzte und oft
mit Schnee <https://de.wikipedia.org/wiki/Schnee> oder Eis
<https://de.wikipedia.org/wiki/Eis> gefüllte Rinne an einem Berghang oder
in einer Bergwand.
Couloirs sind steil und meist eng und aufgrund ihrer Struktur meist dem
Stein- oder Eisschlag ausgesetzt." (Wiiipedia)

The big photograph in Pierrick's post above is certainly not showing a
French or German couloir.
In German there is also the term Rinne (English: gulley), for something
like a Couloir that does not imply snow.

With this confusion of term, and the relative rarity of the term in
English, I would suggest not to use it in OSM.

What about "gully" instead.

BTW the French term "couloir" in general is a corridor for people (in
buildings) or materials (in the mountains)

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On Wed, 3 Feb 2021 at 21:33, Joseph Eisenberg <joseph.eisenberg at gmail.com>
wrote:

> The tag needs to have a clear definition which explains how it is
> different than natural=gorge, natural=gully or especially natural=valley
>
> -- Joseph Eisenberg
>
> On Wed, Feb 3, 2021 at 10:25 AM Walker Kosmidou-Bradley <
> walker.t.bradley at gmail.com> wrote:
>
>> A couloir is a particular feature of mountain topography, not just a
>> tight valley.  Unlike a valley, there is no floor, it’s a confined space
>> often used for ascents or descents.
>>
>> On Feb 3, 2021, at 17:59, Volker Schmidt <voschix at gmail.com> wrote:
>>
>> 
>> What makes a couloir different from a (steep) valley? Only the steepness?
>>
>> Volker
>>
>>
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>>
>> On Wed, 3 Feb 2021 at 18:21, pierrick pratter via Tagging <
>> tagging at openstreetmap.org> wrote:
>>
>>> Renewal of the natural=couloir tag : Proposed_features/couloir_2
>>> <https://wiki.openstreetmap.org/wiki/Proposed_features/couloir_2>
>>>
>>>
>>>
>>> Definition : A narrow gully with a steep gradient in a mountainous
>>> terrain
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