[OSM-talk] Bridges

[Barry Crabtree]

On 10/17/06, Etienne <80n80n at gmail.com> wrote:
>
> 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.


Thanks - I'm pretty new to this and trying to get it all clear! Am I right
in assuming that the bridge=yes tag will allow it to be rendered
differently, and as you say, use the the layer tag to get the appropriate
ordering.

I've been trying to create a good example for this based on a roundabout
that goes over a dual carriagway, but can't seem to get it to render nicely.
If I make the roundabout a way and tag it level=1 it renders it nicely above
the dual carriageway, but all the junctions with the sliproads have lines
accross them. I tried splitting the roundabout into four separate ways, and
just tagged the parts that go over the dual carriagway level=1 and got a
different looking version that put round caps on the parts at level=1.
Neither looks right to me.

You can see what has happened at
http://wiki.openstreetmap.org/index.php/Talk:Editing_Standards_and_Conventions

This was rendered with osmarender 3.1

Cheers. Baz.


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.
> > _______________________________________________
> > 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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