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

Ilpo Järvinen ilpo.jarvinen at helsinki.fi
Wed Apr 2 12:49:36 UTC 2014

On Wed, 2 Apr 2014, Martin Koppenhoefer wrote:

> 2014-04-02 13:51 GMT+02:00 Richard Z. <ricoz.osm at gmail.com>:
>       It is not wrong by itself but there are many circumstances
>       where it
>       is plain wrong
> +1, it is not wrong as long as there aren't any crossing / overlapping
> objects that have a different layer in OSM (e.g. no layer tag in OSM =
> implicit layer=0) but are physically or conceptually on the same layer in
> reality. Basically you'd have to put all these other objects as well to
> layer=-1, which in turn would most probably require you to put even more
> objects on layer=-1 and so on.

So how would bridge+layer=1 => bridge+layer=2 transition happen, given 
such a non-sense rule. Definately a road continuing is supposedly "on the 
same layer" as the previous part? Does it imply layer is cast to stone for 
the whole road network because all connections to a node are definately 
sharing the level at the node. Or what did you mean?!?


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