Hi Volker,
I generally tag them with:
roof:material=grass
or
roof:material=plants
http://wiki.openstreetmap.org/wiki/Key:roof:material
But in this case and maybe in other smaller cases it looks like we
almost need a:
roof:use=*
Where the roof is used for something besides just covering.
Either way, I don't think the roof:material=* tags would be incorrect.
By the way it looks like the roof or the tunnel that goes under it could
use some layer=* tags as well.
http://wiki.openstreetmap.org/wiki/Key:tunnel
It might even be more accurately tagged tunnel=building_passage
Cheers,
Blake
On 9/13/2015 2:16 PM, Volker Schmidt wrote:
How does one correctly map a roof garden (or better: roof park) like this:
https://www.openstreetmap.org/way/303934391
It's on top of a shopping centre/garages construction. There are even
appartment blocks "in" the roof top park. At present it's tagged as
building, nothing more.
You can clearly see the extension by observing the ventilation and/or
light openings on the satellite photos.
Incidentally there is another one just to the north of this one that is
not tagged at all.
Volker
(Italy)
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