[Therion] Help with extended elevation drawing

[Bruce Mutton]

Hi Efi

I don't have an answer, but some things to try or contemplate.

 

Try adding log extend to your thconfig, before the export statement.  It
will create a transcript of the extend sequence that Therion is using.  This
might provide insight as to what you need to change.

A couple of references.

https://therion.speleo.sk/wiki/extend?s[]=extend
<https://therion.speleo.sk/wiki/extend?s%5b%5d=extend> 

https://therion.speleo.sk/wiki/breakingextend?s[]=extend
<https://therion.speleo.sk/wiki/breakingextend?s%5b%5d=extend> 

 

My experience is that starting drawing before the centreline is 'extended'
exactly as you want it, is risky.  Making extend changes after drawing
increases the risk of surprising distortions (and therefore rework), like I
think is in your example at station 45.0

 

The complexity of getting the extended network as you would like it appears
to be exponentially proportional to the number of loops.

As an example I have a 600 m survey where Therion reports 10 loops (shown in
blue) and I have added some 'no-survey' loops as well.  



After about 5 interconnected loops I found it impossible to gain full
control of the extended network.  In this case I was lucky, and by strategic
hiding of legs I can get an acceptable extended elevation by hiding the
'noise'.

So, if your survey has many loops, that may be an indicator of the
complexity you are likely to face.  Be aware that if you subsequently add
more surveyed loops, it will likely affect the network you have already
drawn.

 

It may be that extended control is easier when extend statements are
interleaved with survey leg data.  My examples all have extend control
isolated in files separate to the centreline data, as described in the first
link above.

 

I notice that your example equates seem to show that your 'surveys' are
named 'map'.  This might become confusing when you are trying to manage both
survey objects and map objects, but so long as you keep track of things it
will not directly affect extend behaviour.

 

Number is too large error.  Feels like something to do with scrap
distortion??  Don't know.

 

No real solution, but some thoughts that might be helpful.

 

Bruce

 

 

From: Therion <therion-bounces at speleo.sk> On Behalf Of Elfi Hristova
Sent: Thursday, 10 November 2022 05:20
To: List for Therion users <therion at speleo.sk>
Subject: [Therion] Help with extended elevation drawing

 

Hi I am asking for help with extend elevation of a section in a map I am
drawing. I have 3 surveys that join in a loop. I want to extend from the
place where I have rope but it will not work.

On the picture this is station 99. 

 

I tried with: 

extend ignore 33  34 @map1,  (I get error "Number is too large.. .some
numbers" when compiling)

extend ignore 0   1 @mapConnections (does nothing)

extend start 99 @map2 (does nothing)

 

equates are:

99 at map1 99 at map2, 

0 at map3 100 at map2

34 at map1 0 at mapConenction

1 at mapConnection 3 at map3

 

Could somebody please point me what is the correct order of extend commands
so the drawing can continue from station 99, not 34? 

 

Thanks,

Efi

 

 

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