[Tagging] surface=rock

Tobias Zwick osm at westnordost.de
Sat Nov 21 16:43:57 UTC 2020

 > rock „pieces“ would be tagged as „stone“ I guess?

Not so sure about that, then it would be surface=stones, (note the 
plural) wouldn't it?


There is a huge discussion on the #tagging channel on OSM slack (85+ 
replies) where all those "rocky" surface are being discussed.

Here are some statements from this discussion, also on the difference 
between "surface=rock" and "surface=stone". Most from Brian Sperlongano 
and Elliott Plack:

- Rock implies a rough naturalness

- Steps made of large (single-piece) hewn stone columns would be called 
'stone steps'

- Bare [rock] implies the lack of rubble on top

- Scree is specially loose

- Personally I think bare_rock and stone are synonyms here, unless 
someone thinks there's a difference.

- bare_rock has 569 usages, rock has 2759 usages and stone has 6402 
usages, scree has 319 usages, rocky has 1400 uses


For Germans, I'd say stone roughly translates to "Stein" while rock 
translates to "Fels". To summarize the above:

rock = rough natural stone, could be loose stones too
stone = smooth stone / bare rock, could be hewn
bare_rock = probably similar to stone, definitely no loose stones
scree = surface like (large) gravel, natural
rocky = scree is rocky, piles of differently sized rocks are rocky


On 21/11/2020 09:57, Martin Koppenhoefer wrote:
> sent from a phone
>> On 20. Nov 2020, at 23:22, Mateusz Konieczny via Tagging <tagging at openstreetmap.org> wrote:
>> Both for exposed natural rock and steps/footways made of rock pieces?
> rock „pieces“ would be tagged as „stone“ I guess?
> Cheers Martin
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