[Talk-GB] mapping tunnels

[Barnett, Phillip]

There's a few road tunnels in the North Wales area (Conwy) which I've
just put as simple straight lines between entrance and exit, even though
they obviously curve, because I can't accurately survey them. 

In this case, I'd say topology beats geographic accuracy. 

After all, nobody is likely to use OSM for excavation purposes, or to go
off-road hiking in a tunnel...


 
 



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-----Original Message-----

From: talk-gb-bounces at openstreetmap.org
[mailto:talk-gb-bounces at openstreetmap.org] On Behalf Of Thom Shannon
Sent: 27 September 2007 23:19
To: talk-gb at openstreetmap.org
Subject: [Talk-GB] mapping tunnels

Does anyone have any suggestions how to map a long tunnel? I know how to

tag the ways, the issue is where does the tunnel go. You can't exactly 
get a GPS trace! I want to map the tunnels under the Mersey. The 
queensway tunnel has 3 exits, all at slightly odd angles and there is a 
junction in the middle of the tunnel.

Do you think I could figure out some reasonable positions using a cars 
odometer and a compass? Or does it not really matter that much?

Another option just occurred, the tunnel was started in 1925, so any 
maps from that era would be out of copyright. Perhaps a trip to the 
library?

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