[Talk-GB] Cliff editing

[Warin]

On 22/8/22 21:16, Tom Crocker wrote:
> Hi Keith.
>
> My understanding (and practice) is to map the top of the cliff edge.


Agree, top edge it what to map. This is the practice in other maps. The 
direction of the way gives the falling direction - right hand side 
(facing the forwards direction) is the fall.


 From https://en.wikipedia.org/wiki/Cliff

"The Ordnance Survey <https://en.wikipedia.org/wiki/Ordnance_Survey> 
distinguishes between around most cliffs (continuous line along the 
topper edge with projections down the face)"


> You can then add an area of natural=bare_rock if the cliff is a slab 
> and extends out 'beneath' the top edge (of course, there may also be 
> flat bare rock along the top edge and perhaps at the bottom).
Also scree, sometimes at the bottom of a cliff.
> The wiki recommends path=climbing_access for dedicated crag access, 
> used 1188 times apparently without additional tags (e.g. 
> highway=path): 
> https://taginfo.openstreetmap.org/tags/path=climbing_access#overview
> Personally I would just add them as footways if their placement seems 
> reasonably stable (with additional tags as appropriate).
> You can add the starting point of each route with 
> climbing_route=bottom https://wiki.openstreetmap.org/wiki/Climbing 
> although I haven't done this as I am unsure about the appropriateness 
> of any source of names.
>
> P.S. I know of no good way of dealing with overhangs regarding 
> natural=* or paths (possibly use of covered for paths, or later?)
I have used covered.
>
> Cheers
>
> Tom Crocker
>
> On Mon, 22 Aug 2022, 11:51 Keith, <keith at fachwen.org> wrote:
>
>     I’m interested in adding missing rock-climbing cliffs here in
>     Snowdonia. There are lots 🙂
>
>     Mostly obscure little ones, that can be quite a challenge to find
>     when walking to visit for the first time due to bracken, no real
>     path, etc.
>
>     Just checking … should the line of the cliff be at the top of the
>     edge of the cliff, or at the bottom where rock-climbers naturally
>     want to be setting up kit, etc.
>
>     As a climber, the need is to know where to walk to, best place for
>     setting-up, etc.
>
>     As an OSM mapper, maybe the issue is ‘where is the crag edge?’ ie
>     the dangerous bit for walkers, general public, etc.
>
>     Most existing crags seem to be mapped somewhere in ’the middle’ of
>     the cliff, as a line of nodes, or the actual top edge.
>
>     One ‘best practice’ might be to map the top edge of the actual
>     cliff, and survey the path to where climbers mostly go to park
>     their rucksacks, etc
>
>     Thanks.
>
>
>     _________________________________________________________________________
>
>     Keith Robertson, Tyn y Pwll, Fachwen, Caernarfon, Gwynedd, North
>     Wales, UK LL55 3HD
>
>     keith at fachwen.org - www.fachwen.org <http://www.fachwen.org>
>
>     Text or Voice: 07515 966 558
>     twitter: @keithrobertson
>     www.flickr.com/photos/fachwen/sets
>     <http://www.flickr.com/photos/fachwen/sets>
>
>
>     BE GREEN! Read from the screen.
>
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