Here is a nice puzzel?
How would you tag a path that lies under an overhanging cliff?
So it is not a tunnel, nor under a bridge...
Conceptually I view 'layer 0' as ground surface .. but in this
location/cross section there are 3 'layer 0's - the top of the cliff,
the path and the 'roof' of the path. I think under KISS principles ..
layer 0 will do.
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I should have posted this some days ago .. for the 1st. :)
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