> 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?

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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

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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

Tobias

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@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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