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... PHILLIP BARNETT SERVER MANAGER 200 GRAY'S INN ROAD LONDON WC1X 8XZ UNITED KINGDOM T +44 (0)20 7430 4474 F E [EMAIL PROTECTED] WWW.ITN.CO.UK P Please consider the environment. Do you really need to print this email? -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Thom Shannon Sent: 27 September 2007 23:19 To: [email protected] 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? _______________________________________________ Talk-GB mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk-gb Please Note: Any views or opinions are solely those of the author and do not necessarily represent those of Independent Television News Limited unless specifically stated. This email and any files attached are confidential and intended solely for the use of the individual or entity to which they are addressed. If you have received this email in error, please notify [EMAIL PROTECTED] Please note that to ensure regulatory compliance and for the protection of our clients and business, we may monitor and read messages sent to and from our systems. Thank You. _______________________________________________ Talk-GB mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk-gb
