[OSM-newbies] bridge tagging in JOSM

[Andy Robinson (blackadder)]

David James wrote:
>Sent: 12 January 2008 7:36 PM
>To: newbies at openstreetmap.org
>Subject: Re: [OSM-newbies] bridge tagging in JOSM
>
>
>On Sat, January 12, 2008 6:05 pm, Andy Robinson \(blackadder\) wrote:
>> Harald,
>>
>>
>> This is because there are no segments anymore. The ways (polylines)
>> consist only of an ordered list of nodes. To tag a way as a bridge
>> (bridge=true|yes)
>> you need to make the way the length of the bridge, usually by breaking
>the
>>  existing way into more than one part.
>>
>> In theory it is possible to use the relationship element to define a
>> bridge between two nodes and use that information to render a bridge on a
>> particular way, however that's not really in keeping with the method of
>> mapping the physical properties separately on the ground. Since the
>> bridge is a separate entity along a road its logical to have it as a
>> separate way with its own tags.
>>
>> Trust this helps
>
>The "Editing Standards and Conventions" page in the Wiki (at
>http://wiki.openstreetmap.org/index.php/Editing_Standards_and_Conventions)
>says
>"If the bridge can be represented as a node (say a small footbridge over a
>stream), then it would be tagged highway=bridge"
>as an alternative to tagging a way with "bridge=(true|yes)"
>
>Is this still correct?
>
>My impression is that the renderers don't now do anything usefull with
>"highway=bridge".
>
>The "Editing Standards and Conventions" page is tagged "{{OutOfDate}}" -
>is this one of the out-of-date sections?
>

I've not looked but it sounds like it's a bit out of date now. Tagging a
node is still appropriate for a small item. I generally consider whether the
feature is less than 10m in size, if it is I think about whether to create
the feature with a way (or area way) or simplify it as a node. Thus gates,
crossings, fords, etc usually get the node treatment. So highway=bridge on a
node is still fair enough although unlikely that its going to make the
default renderings any time soon as it would need an icon and one that could
be rotated to fit the way orientation. For practical reasons therefore
creating the bridge as a way is probably now the better approach even for
small bridges.

Cheers

Andy

>David
>--
>David James
>
>
>
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