[Talk-GB] [Fwd: Re: Conflicting tagging of london undergound stations]

Mark Williams mark.666 at blueyonder.co.uk
Fri Sep 21 08:16:42 BST 2007

-------- Original Message --------
Subject: 	Re: [Talk-GB] Conflicting tagging of london undergound stations
Date: 	Fri, 21 Sep 2007 08:13:30 +0100
From: 	Mark Williams <mark.666 at blueyonder.co.uk>
To: 	Robert (Jamie) Munro <rjmunro at arjam.net>
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Robert (Jamie) Munro wrote:
> Hash: SHA1
> Alex Mauer wrote:
>> I'm assuming that the vast majority of railway=subway in the world is
>> below ground,
> You're assuming wrong. Only 45% of the London Underground is actually
> tunnels. The other 55% is above ground. I expect other cities are similar.
>> and therefore that requiring an additional tunnel=yes tag
>> on 90% or more of the subway ways, is not as good as treating the
>> below-ground portions as a lower layer (whether it's -1 or -2 or -10000
>> is beside the point)
> It might be better to abolish rail=subway and just use rail=metro. It's
> then obvious that you only put tunnel=yes when it is in a tunnel.
> Robert (Jamie) Munro
For what it's worth, London underground is of course on many layers - to 
some extent, each line wants a different layer tag as they cross at 
varying depths.
OTOH I'm not sure how relevant it is, as the layer tag is largely for 
rendering & how important is it to render the levels right on a map?
I personally would want it right, because it's there.

Both tunnel & layer have their place, I would agree with the idea of the 
default for rail=subway/metro being tunnel=yes, even for London at 45% 
correct! I think I'd default layer as -3 though as not much goes under 
the Tube, but covered rivers go above it & I bet they're all -1 at least.


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