[Tagging] convert imported natural=rock areas to bare_rock
Christoph Hormann
chris_hormann at gmx.de
Sun Jul 13 19:04:30 UTC 2014
On Sunday 13 July 2014, Friedrich Volkmann wrote:
> >
> > The Corine natural=rock areas on the other hand are not
> > natural=bare_rock, neither factually as you can easily check with a
> > few examples nor by definition [2] where it is simply described as
> > "Scree, cliffs, rocks outcrops, including active erosion, rocks and
> > reef flats situated above the high-water mark".
>
> I wouldn't have started this thread without checking a few examples.
> These areas are predominant in high regions of the Alps, the Pyrenees
> and of Corsica. They look "rocky" on areal images. The definition you
> cited conforms with natural=bare_rock, except for scree, which is
> natural=scree. Some of the areas could also be tagged as
> natural=fell. But at least natural=bare_rock wouldn't be any wronger
> than natural=rock.
Replacing one wrong with another wrong does not make it right. ;-)
But even worse this would dilute the meaning of natural=bare_rock. The
natural=rock tag is not used anywhere else on larger polygons so there
is fairly little harm in having these in the database. But if you are
worried about this retag them with some specific tag like corine=3.3.2.
It might appear if you do not look too closely as if some of the areas
tagged natural=rock in France are indeed mostly bare bedrock but as
said overall they mostly are a mixture of all kinds of stuff from
bedrock to mud with mostly one thing in common, that is they are
largely lacking vegetation. natural=bare_rock OTOH is predominantly
exposed bedrock The fairly typical landscape in both Pyrenees and
Corsica of rocky terrain with scattered trees, scrubs and grass, like:
http://commons.wikimedia.org/wiki/File:France_Pyr%C3%A9n%C3%A9es_Lac_N%C3%A8re_%28Vall%C3%A9e_de_Bar%C3%A8ges%29.jpg
http://commons.wikimedia.org/wiki/File:Port_du_Marcadau_-_versant_espagnol.jpg
http://commons.wikimedia.org/wiki/File:Etang_de_caraussan_aerien.JPG
http://commons.wikimedia.org/wiki/File:Grand_Cambal%C3%A8s.jpg
does not qualify as natural=bare_rock in total even if locally there is
exposed bedrock of course.
--
Christoph Hormann
http://www.imagico.de/
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