Thanks
> I generally tag them with: > > > > roof:material=grass > > > > or > > > > roof:material=plants > does not work really in this case: - There is no "roof" depending on he direction from which you appraoch. It may look like a building with a roof from one side, but from the opposite it looks, as if your are entering onto a park - It looks and is used as leisure=park Is it best to just tag the part of the roof that is a green roof with > landuse=grass? > What about two polygons with landuse type of tags on different layers the commercial/garage layer: landuse=commercial layer=0 the park layer: leisure=park layer=1 This would be in analogy to how we tag street or railway tunnels (thanks for pointing out the missing layer on the tunnel and the building_passage tag value, which I did not know) But if we consider it as a building we would need to use the 3D tagging approach with levels. Volker
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