[Tagging] Surface value for irregular, flat stones with variable gaps

[Fernando Trebien]

On Tue, Jan 16, 2018 at 8:44 AM, althio <althio.forum at gmail.com> wrote:
> Great post and superb reference site Fernando.

Thanks! :D

> I think this cobblestone:flattened can be a good value (not with the
> current definition in the wiki, but with intended usage by mappers).
> It would apply to old streets where real cobblestone is in place, the
> big rounded sort, for a very uneven surface.
> On this rounded stones, only the top would be now cut: the stone is
> flattened only on one face, possibly years after is was laid. Of
> course the surface is more even, but the look of the rounded stones is
> not completely lost.

So it would be "jointed large rounded natural stones cut to a flat
top"? Smoothness similar to setts, but appearance similar to
cobblestones?

Also, [1] describes some pavements as "Cobbles chosen for flat upper
surface" which is possibly not the same as being cut, but possibly
what is meant by "flattened" in OSM. Then, for contrast, it also
describes another pavement as "Cobbles laid prominently" which is
possibly what the first users of surface=cobblestone:flattened thought
that surface=cobblestone meant - the current image in the wiki
suggests they are not that prominent [2]. The Wikipedia article on
cobblestones [3] begins with the same image [4] that is used in the
OSM wiki for cobblestone:flattened [5], then presents an image of the
more prominent type [6].

> Maybe some wiki readers were confused and applied many
> "cobblestone:flattened" in stead of "sett" but that should be verified
> case-by-case.

Probably. Perhaps something got lost in translation too.

[1] http://www.pavingexpert.com/cobble01.htm
[2] https://wiki.openstreetmap.org/wiki/File:Guzow-oryszew_road_cm03.jpg
[3] https://en.wikipedia.org/wiki/Cobblestone
[4] https://en.wikipedia.org/wiki/File:Ancient_road_surface.jpg
[5] https://wiki.openstreetmap.org/wiki/File:Ancient_road_surface.jpg
[6] https://en.wikipedia.org/wiki/File:ItalianStones.jpg

-- 
Fernando Trebien
+55 (51) 9962-5409

"Nullius in verba."