[Imports] CLC meadow cleanup

[Christoph Hormann]

On Saturday 22 March 2014, Paul Norman wrote:
>
> 2. Are there other CLC classifications which are just as bad?

I think bare rock areas are usually nonsense as well like in case of [1] 
and [2] (these are frequently tagged as natural=rock but that's a 
different story).

There are several factors contributing here:

- CLC is mostly based on satellite image classification and it is very 
difficult to distinguish solid rock (natural=bare_rock) from loose rock 
(natural=scree) this way.

- in central Europe bare rock is rarely continuous over areas large 
enough to be sensibly mapped on the scale of CLC.

- the CLC specs do not even claim this class to be solid rock, any type 
of unvegetated or sparsely vegetated areas except dunes is included.


natural=scrub based on CLC is also quite pointless since it has been 
used for both class 323 (where it fits) and class 333 (where it does 
not fit at all) see [3].  If the class code is in the tags it would be 
possible to sort this out, otherwise the data is garbage.

[1] http://www.openstreetmap.org/way/237746250
[2] http://www.openstreetmap.org/way/237418018
[3] http://wiki.openstreetmap.org/wiki/Corine_Land_Cover

-- 
Christoph Hormann
http://www.imagico.de/