[Tagging] Feature Proposal - Voting - Couloir 2

[Joseph Eisenberg]

During the RFC asked that this tag be clearly defined. The tag needs to
have a clear definition which explains how it is different from
natural=gorge, natural=gully or especially natural=valley.

Now the page still lacks a short definition or description statement. This
is a serious problem. But it does say:

"A couloir may be a seam, scar, or fissure, or vertical crevasse in an
otherwise solid mountain mass. Though often hemmed in by sheer cliff walls,
couloirs may also be less well-defined, and often simply a line of broken
talus or scree ascending the mountainside and bordered by trees or other
natural features. Couloirs are especially significant in winter months when
they may be filled in with snow or ice, and become much more noticeable
than in warmer months when most of the snow and ice may recede."

The distinction from natural=gully:

"A gully is a small scale land form (a meters to a few tens of meters)
incised into surrounding terrain through erosion by flowing water. Also
they are applicable to most terrain (hill, flat land, mountains), but
Couloir are specifically found on mountainous relief, especially on
mountainous terrain. A couloir can be 1000 meters long and they can be from
a few meters to a few hundreds of meters wide. They are usually very steep
and exposed to danger. Also, they are not seen as barriers (as a gully can
be), but more as way to ascent or descent a mountain. There are gully on
mountainous terrain but these are cracks in a cliff that are only a few
meters wide. A couloir can end in a gully or multiple gullies."

Unfortunately I don't think this makes it clear when to use natural=gully
or natural=couloir.

– Joseph Eisenberg

On Thu, Feb 18, 2021 at 11:41 AM pierrick pratter via Tagging <
tagging at openstreetmap.org> wrote:
>
> Voting has started for Couloir 2.
https://wiki.openstreetmap.org/wiki/Proposed_features/couloir_2
>
>
>
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