[OSM-talk] Mapping and surveying long road tunnels

[Richard Fairhurst]

Steve Chilton wrote:

> How would you survey the curving underground
> alignment of the Limehouse Link? I suspect even the best GPS handheld
> devices won't get a signal. You can't get any useful data from the Yahoo
> satelite imagery. You can't use any published map sources that you
> consider reliable as it is too new for o-o-cop maps.
> Any thoughts?

Half in jest, Nick Gagravarr and I were talking a while back about  
using a motion sensor for underground surveying... such as the one on  
the Nintendo Wii.

cheers
Richard