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| London Transport (uk.transport.london) Discussion of all forms of transport in London. |
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#1
March 16th 12, 07:32 AM
posted to uk.transport.london,uk.railway
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Crossrail tunnelling to start shortly
In article , Basil Jet
scribeth thus On 2012\03\15 21:03, Denis McMahon wrote: I wouldn't trust a gps derived position underground even if I could receive the signals - you don't know how much bouncing about it's done getting through the soil, pipes, rocks of various types, cables etc above you, and every signal bounce is a loss of accuracy. GPS is not accurate enough for laying a surface railway, Really?. never mind an underground one. How could you receive the GPS signals underground anyway?.. -- Tony Sayer |
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