[OSM-talk] Underground / hovering buildings

[Nathan Edgars II]

David Murn wrote:
> 
> Well, the page seems to contradict itself, suggesting that a tunnel
> under a building is layer=0.
> 
Depends if the tunnel goes underground or just through a building while
remaining at ground level (though the latter case might be better described
as covered).


David Murn wrote:
> 
> Also in a note near the bottom of the
> page, it is suggested that a flat bridge at the same level as the ground
> around it should be level=1, even if what it crosses is far below.
> 
Example: http://en.wikipedia.org/wiki/Royal_Gorge_Bridge
The ground level itself goes down into the gorge.
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