[OSM-dev] MAPNIK - proposal to drop rendering of underground railway lines

Robert (Jamie) Munro rjmunro at arjam.net
Thu May 17 18:22:27 BST 2007

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Peter Pearson wrote:
> ----- Original Message ----
> From: Nick Black <nickblack1 at gmail.com>
> To: Andy Allan <gravitystorm at gmail.com>
> Cc: Dev Openstreetmap <dev at openstreetmap.org>
> Sent: Wednesday, 16 May, 2007 6:03:56 PM
> Subject: Re: [OSM-dev] MAPNIK - proposal to drop rendering of underground railway lines
>> But what functionality does it add to the map?
> As others have said, it's useful.
> I find this hideously useful:
> http://tubejp.co.uk/

Yes! That is exactly the kind of overlay I was thinking of. If we can
make an overlay like that, it would be really cool. But it's irrelevant
to the matter at hand, which is what happens when that overlay is off.

IMHO all subway lines that are under the ground must disappear, and all
railways that are not under the ground must stay visible as landmarks to
navigate by (weather they are part of subway networks or not). Main line
railways that are passing through a tunnel through a mountain or
something in the countryside could be shown dotted, but if they are
passing under a city (like thameslink), then they should be hidden, the
same as subways, unless the subway overlay layer is switched on.

See for example West Acton station in that tubejp site. The line is
visible in the normal map because it is above ground, but the overlay
tells you what colour it is.

I still think the problem is that it isn't clear if railway=subway
implies that it is under the ground or not - we need to distinguish
railways that are part of subway networks from railways that are under
the ground. The two properties are independent of each other.

Robert (Jamie) Munro
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