[Therion] Breaking a loop at a specific station on extended elevation

[Bruce Mutton]

Like this?



I find extend very trial and error.  I looked at your file and looked at my wiki page, and decided it might not be easily possible.  Then I tried it out, and on my second attempt made it work.  This does not necessarily mean it will work as part of a large project however!!

https://therion.speleo.sk/wiki/extend#summary_of_all_extend_options_for_survey_centrelines

Bruce

 

 

-----Original Message-----
From: Therion <therion-bounces at speleo.sk> On Behalf Of Tarquin Wilton-Jones via Therion
Sent: Sunday, 10 November 2019 01:46
To: therion at speleo.sk
Cc: Tarquin Wilton-Jones <tarquin.wilton-jones at ntlworld.com>
Subject: [Therion] Breaking a loop at a specific station on extended elevation

 

Hi folks,

 

There are a few of us who are struggling with an extended elevation problem. I have attached a sample data file, which represents the data from a real cave.

 

There is a main passage (stations 1-2-3-4-5-7), and a high level oxbow (stations 2-6-5). Because the oxbow is shorter, Therion defaults to using that as the primary extended elevation path, which is not desired.

The natural (human preferred) way of extending that, is to show the main passage as a single line, then have the high level oxbow split at station 6, with a leg pointing to each of the two stations it connects to, and a dotted line connecting the two versions of station 6. Like this (if your email client shows this with a fixed width font):

 

     6....6

    /      \

1--2--3--4--5--7

 

We tried various "extend left" "extend right" and "extend ignore", and we managed to make it break station 2, but it seems not to want to break on station 6. (We can obviously break it in the right place by breaking the data, but that is not the intention is to keep the data valid.)

 

Can someone please tell us the magic formula of extend commands that will produce the desired output?

 

Thanks for the assistance.

 

Tarquin

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