[OSM-talk] Bridges / viaducts for railways

Tom Chance tom at acrewoods.net
Tue Jan 29 12:16:34 GMT 2008


Hello,

On Tue, 29 Jan 2008 10:11:34 +0000, "Dave Stubbs"
<osm.list at randomjunk.co.uk> wrote:
> On Jan 29, 2008 8:13 AM, Michael Collinson <mike at ayeltd.biz> wrote:
>> As to way forward, I suggest there are 3 options:
>>
>> - Depreciate the viaduct tag entirely [*]
>>
>> - Use viaduct=yes
>>
>> - Complement the generic bridge=yes tag and develop a specialist
>> bridge type tag for bridge devotees with precise
>> architectural/engineering definition.

I think this is a very sensible way of moving forward, based on the replies
so far. At the moment I use the bridge tag for viaducts, which looks ugly
and is inaccurate. I'd suggest that viaduct=yes looks similar or identical
to bridges on Mapnik, perhaps with a slightly lighter casing if it looks
like a big dark blobby nightmare where there are a lot of them.

> From what I think I understand, the railway lines out of Waterloo station
> in London are pretty much going to be classed as going over a viaduct all
the
> way to Clapham Junction? These are raised manmade structures about the
> height of a house, mostly with arches etc. Same for lines coming out of
> London Bridge and most other London stations. In fact the district line
> (railway=>subway) between Parsons Green and East Putney is also viaduct?

That's my understanding too, London and other cities will be *full* of
viaducts! Hence my concern, given that it's pretty handy to know how ways
go over/under each other especially when you're walking around half-lost.

Kind regards,
Tom





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