On 10/14/2011 7:35 AM, Frederik Ramm wrote:
Tagging an above-ground subway station as a building is common practice. For underground buildings, things are more difficult; we don't have an established way of recording the fact that they are below the surface. layer=-1 doesn't cut it as it is only relative to other features, not relative to the surface; and tunnel=yes doesn't sound right either (a subway station is not a tunnel, and is not usually "in a tunnel" either).
I've seen location=underground: http://wiki.openstreetmap.org/wiki/Key:location (though the two examples given there do in fact make sense as tunnels).
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