[Talk-GB] Bridges (Edinburgh)

Shaun McDonald shaunmcdonald131 at gmail.com
Wed Aug 8 14:22:34 BST 2007

On 8 Aug 2007, at 13:38, Minty wrote:

> I've noticed many bridges around Edinburgh appear to be done using
> three seperate Ways
> See "George IV Bridge", and also "Castle Terrace" if you pan to the
> left a little.
> http://tinyurl.com/298f7t
> * way_before_bridge
> * way_for_bridge
> * way_after_bridge

That's the way that it should be.

> all three have highway and name attributes set to identical values
> with the middle one also having bridge=yes.
> Mapnik appears to be able to deal with this, but the
> informationfreeway / tiles at home appear to get confused and render the
> street name three times (once per way), which tends to look rubbish.
> But it also seems wrong and over-complicating things to me.
> Would it not be better to have:
> * one way for the whole of the street, with highway and name set.
> * A second Way for the segments covering the bridge with the only
> attribute being bridge=yes (and name= if the bridge itself has a name
> distinct from the road).
> Yes/No?

This is a renderer problem, not a data problem. It is better to have  
more ways, than ways that are too long.

> Also, on a related topic.  Say I have Ways created in a loop to define
> a Park, and use the same segments to create a second Way for a path
> around the boundary of the park.  I cannot fathom how to control which
> way is selected when I click in JOSM.  It appears to pick one, and I
> am unable to select the other.  If the two ways have some different
> segments, you can often work around this, but when they share the same
> segments, I'm stuck.

To select a specific way read
http://wiki.openstreetmap.org/index.php/JOSM/Advanced_Tricks item 2.


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