[OSM-talk] Key:layer update
ricoz.osm at gmail.com
Sun Mar 9 11:43:23 UTC 2014
On Sun, Mar 09, 2014 at 11:47:32AM +0100, Martin Koppenhoefer wrote:
> > Am 09/mar/2014 um 11:30 schrieb "Richard Z." <ricoz.osm at gmail.com>:
> > * the vertical ordering established by the layer values is valid exactly only
> > in the point where the ways cross or objects overlap
> actually at the Point where a layer Way Connects to an layer=0 way both are at the same height (e.g. where a bridge starts)
currently the assumption that everything meeting in a node is physically at the same
elevation in this point is not valid in OSM.
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.
Some objects (such as dam, buildings) have the property to define their own
physical level relations.
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