[Imports] Slovenia landcover import RABA-KGZ review

[Christoph Hormann]

On Monday 23 November 2015, colored stone wrote:
> I think this isn’t really an error. This estimation based on analyses
> of existing elements raba:id=1410 (currently classified as
> natural=heath) – the question was – “how would OSM mapper classify
> this element according to the satellite image”. More than 80% of this
> elements would be classified as natural:scrub, some of them as
> landuse=forest (sometimes it is very difficult to distinguish scrub
> from forest), very few as landuse=meadow (1410 are former
> agricultural areas now overgrowth).

Actually the most likely alternative tagging would be natural=grassland, 
that is in case of areas not dominated by woody vegetation, like ferns 
or other herbaceous perennial plants, without active human 
maintainence - the OSM tagging scheme is fairly insufficient here and 
abuse of natural=scrub for grassland with scattered trees is very 
common.

In general clearly identifying scrub from imagery, even high resolution, 
is rarely possible.  So you ultimately you need ground knowledge to 
properly map this.  It is up to the local community to decide if they 
prefer to map based on local surveying on a clean slate or if they want 
to do this building upon a less precide mapping imported.

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