[Tagging] layer=-1, rivers, bridges and tunnels

Martin Koppenhoefer dieterdreist at gmail.com
Mon Mar 24 13:59:03 UTC 2014

> Am 24/mar/2014 um 14:27 schrieb Friedrich Volkmann <bsd at volki.at>:
> As opposed to that abstract
> layer model, we use a pysical layer model in OSM where layer=0 means
> ground-level, layer<0 means underground, and layer>0 means above ground-level.

AFAIK it is not defined like this, rather it is meant to describe real world stacking (as opposed to rendering order) at a local point: when 2 objects cross the one with the higher layer is above, if both layers are equal they are on the same level


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