[Talk-GB] mapping tunnels
thom at glow-internet.com
Thu Sep 27 23:19:26 BST 2007
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
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