[OSM-talk] Bridges

[Etienne]

Currently Osmarender needs to be explicitly instructed about what should be
drawn over what using the layer tag.  There are no plans to infer this from
a bridge=yes tag.

Etienne


On 10/17/06, Barry Crabtree <barry.crabtree at gmail.com> wrote:
>
> Hi,
>
> I've been following this disussion & thought it would be useful to add a
> short addition to the wiki in Editing Standards and Conventions..
>
> Bridges:
>
> If the bridge can be represented as a node (say a small footbridge over a
> stream), then it would be tagged:
>  highway=bridge
>
> If the bridge is part of a way, then tag the '''segment''' that is the
> bridge as:
>  bridge=yes
>
> If the bridge is a way in its own right, then tag the way as:
>  highway=<whatever-type-of-highway-it-is>
>  bridge=yes
>  name=<whatever-its-name-might-be>
>
> This gives the renderer enough information to render it properly (draw it
> on top of the road, put 'bridge' markings round it etc.).
>
> I tried rendering a couple of examples with this tagging scheme using
> osmarender, but realised it doesn't seem to have any rules for rendering
> bridges so they all come out the same.
>
> This is a very terse summary of what came out of the disccussion on
> bridges<http://lists.openstreetmap.org/pipermail/talk/2006-October/008047.html>
>
> I've put this in the discussion page for now at: http://wiki.openstreetmap.org/index.php/Talk:Editing_Standards_and_Conventions
> & if it seems ok will move it over.
>
> Cheers. Baz.
>
>
> On 10/16/06, Dave <osm.list at randomjunk.co.uk> wrote:
> >
> >
> > > I just feal there is no point going to the troubles of having a
> > differnt tag
> > > for each feature, so highway=footway, then bridge=yes, or style=yes,
> > or
> > > cowstandinginmyway=yes, or statues=yes.  Since only one of these
> > things can
> > > ever be there at once, (no object can share the same phisicial space),
> > So
> > > why not therefore just put them all under 1 tag.
> > >
> >
> > This isn't entirely true: you could quite easily find a footbridge
> > blocked by a cow ;-).
> > In this case the way would need to be marked as both cowstandinginmyway
> > and bridge.
> > These aren't physical objects so much as physical properties of objects,
> > and the schema needs to be able to cope with multiple properties per
> > object.
> >
> > I'm sure there are plenty of real examples which don't involve cows!
> >
> >
> > _______________________________________________
> > talk mailing list
> > talk at openstreetmap.org
> > http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
> >
>
>
>
> --
> Live as if you were to die tomorrow. Learn as if you were to live
> forever.  - Gandhi.
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