[OSM-talk] Key:layer update

Russ Nelson nelson at crynwr.com
Thu Mar 13 01:06:41 UTC 2014

Pieren writes:
 > On Wed, Mar 12, 2014 at 3:22 PM, Frank Little <frankosm at xs4all.nl> wrote:
 > > Richard Z wrote
 > > As mapped, the waterway=stream (Way #138911739) runs underground (layer=-1),
 > > probably through a culvert given the way the stream left and right are
 > > separately outlined as waterway=riverbank (and without layer=*). The way
 > > (stream) should be tagged as a culvert.
 > >
 > > Perhaps there is in reality a bridge not a culvert, in which case the road
 > > needs splitting and the appropriate new road segment tagged as bridge=yes.
 > >
 > > In either case, a layer tag is not needed for rendering.
 > +1

Nonetheless I add one out of habit. But I would be happy to stop,
because as noted, the bridge or culvert carries an implicit layering.

 > Bridge or culvert, one way has to be split (the road for bridge or the
 > stream for culvert)

My rule of thumb here is how it looks from above: if the people on the
top would perceive it as a bridge, I split that way and mark is as a
bridge. Otherwise I split the waterway and mark it as a culvert.

--my blog is at    http://blog.russnelson.com
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