[OSM-talk] Key:layer update

Richard Z. ricoz.osm at gmail.com
Sun Mar 9 12:21:21 UTC 2014

On Sun, Mar 09, 2014 at 01:05:18PM +0100, Martin Koppenhoefer wrote:
> > Am 09/mar/2014 um 12:43 schrieb "Richard Z." <ricoz.osm at gmail.com>:
> > 
> > It is broken by definition in at least one case: waterways ar supposed to 
> > share a node with the dam they are crossing, which means the highway passing 
> > across the dam will also share a node with the river passing thorugh a tunnel
> > or pipeline bellow it.
> -1, it is a modeling problem/error, the highway should not have a common node with the waterway, if it has, it is wrong or should be tagged ford=yes ;-)

the same conceptual problem exists with pylons where they are shared by two bridges
or aerial tramways. Actualy every pylon breaks the rule by definition because it 
connects "ground" with layer=0 with something else at a different level.
How do you want to model such cases better? Lifts in buildings?

In practice this rule is broken more often than you would think: Hamburg is full
of waterways connected with roads on bridges through a tag obstacle. France is 
full of bridges sharing a node with the waterway bellow.

It may be worth to tag have such a rule restricted for "ways of the same type"
and a short well defined list of exceptions.


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