[OSM-talk] Bridges

[Barry Crabtree]

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!
>
>
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>



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