On 27.1.2007, at 22:09, Bill Chadwick wrote:

> It is quite easy to create a web page that shows a cave survey  
> overlay on
> top of Google / Virtual Earth maps.

Good work!

There is only one problem - google doesn't calculate with underground  
in 3D - so you may not see the vertical dependencies, the caves are  
always on surface.

Martin

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