[postgis-users] Closing polylines

[georgew]

Nicolas, your code is really magic in the way it closes those segments even
though they are in random sequence! I am beginning to think that I am going
to need a combination of all the solutions proposed above to cover all the
various contour scenarios, including those with gaps, without gaps, open
against one map edge or multiple edges, fully enclosed with all segments
already in sequence or in random sequence and/or with inverse point order. 
Brent, your links and examples may well be another strategy, I have a lot to
learn, but I will start by trying to adapt your script.
All this is going to take me a bit of time to evaluate, but with your help
so far I am way ahead of where I was a week ago.
Thanks again, I will not fail to take up your offer of help if I get stuck!.
George

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