[Therion] cave depth

[Wookey]

+++ Bruce [2015-03-07 10:31 +1300]:
>    Hi Martin
> 
>    My point was, what relevance does an entrance have to the depth of a cave
>    (from Therion’s perspective)?
> 
>    Entrances may occur anywhere in underground survey network, at end of
>    branch or mid branch (hole in roof of shallow cave).  Software should only
>    take survey network as being of relevance to the depth calculation.  The
>    flagging of entrances (or not) is quite an independent concept that should
>    not alter the way depth is calculated.

Well the depth could become +15, -230, rather than just 245m if there
is one entrance 15m below the highest point. You may or may not prefer
that - just saying that they could be related in that way.

Wookey
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