[Therion] Therion Map Header Overrides

Bruce Mutton bruce at tomo.co.nz
Thu May 10 10:37:11 CEST 2018


And thanks to Kevin Dixon for reminding me.

You can find much of relevance to Therion within the Survex Manual.  There
is a link to it on the front page of the Therion wiki.



Search the Survex manual for "flags" and you will learn more.

 

Bruce

 

From: Therion <therion-bounces at speleo.sk> On Behalf Of Bruce Mutton via
Therion
Sent: Thursday, 10 May 2018 8:02 AM
To: 'List for Therion users' <therion at speleo.sk>
Cc: Bruce Mutton <bruce at tomo.co.nz>
Subject: Re: [Therion] Therion Map Header Overrides

 

Nick

Here are some examples of various 'flags' usage, for shot flags, not to be
confused with station flags.  They are a survey property, not so much a
drawing property.

 

Approximate and duplicate:

https://therion.speleo.sk/wiki/extend?s[]=flags#summary_of_all_extend_option
s_for_survey_centrelines
<https://therion.speleo.sk/wiki/extend?s%5b%5d=flags#summary_of_all_extend_o
ptions_for_survey_centrelines>  and scroll down to the code below "Creating
links between separate caves that are close to each other".  That one is a
bit oddball, not typical usage.

 

https://therion.speleo.sk/wiki/metapost?s[]=flags#general_symbol_examples
<https://therion.speleo.sk/wiki/metapost?s%5b%5d=flags#general_symbol_exampl
es>  to redefine centrelines to reflect flag states.

 

And, um, yes, there is not too much on actual usage examples for flags
surface.  Here is a snippet from my last Sunday's survey efforts.  A short
cave that required three ptopo files to adequately capture it.  It is part
of a survey loop that goes out of one entrance and into another.

 

data normal from to tape compass clino ignoreall

. 

#following legs are within the cave

#3.18     3.19        2.099     355.01   -32.84    3.19 entrance rock

#3.18     3.19        2.098     355.2     -32.67    

#3.18     3.19        2.098     355.31   -32.69    

3.18        3.19        2.098     355.11   -32.73    Calculated leg from 3
above

3.19        -              0.269     49.83     -12.76    

3.19        -              0.588     43.99     45.86     

3.19        -              0.714     21.48     76.27     

.

 

flags surface

#following legs are on the surface

  # extend right

#3.19     3.20        2.819     254.97   -14.44    3.21 other entrance rock

#3.19     3.20        2.818     255.03   -14.34    

#3.19     3.20        2.819     255.11   -14.33    

3.19        3.20        2.819     255.0     -14.37    Calculated leg from 3
above

3.20        -              0.556     102.47   -59.13    

3.20        -              1.045     129.78   5.18        

#3.20     3.21        6.017     207.42   -12.3      

#3.20     3.21        6.026     207.53   -12.4      

#3.20     3.21        6.067     207.48   -12.46    

3.20        3.21        6.037     207.47   -12.39    Calculated leg from 3
above

 

flags not surface

#following legs are within the cave

3.21        -              1.275     43.78     -4.28      

3.21        -              2.58        41.32     3.61        

3.21        -              2.914     39.54     15.74     

.

  # extend left

#3.21     3.22        3.613     113.19   23.44     

#3.21     3.22        3.616     113.08   23.59     

#3.21     3.22        3.609     113.05   23.6        #rename 3.22 as 3.14 to
acknowledge loop

3.21        3.14        3.613     113.13   23.55     Calculated leg from 3
above

3.14        -              4.408     324.85   -51.94    

 

The survey-list output for this cave looks like.

 


Title

Length

Depth

Explored

Approx.

Duplicate

Surface

Shots

Stations


Wairoa Valley Cave, Nelson

128

10

0

0

3

9

428

431


1-Wairoa

46

7

0

0

0

0

131

132


2-Upper, Wairoa Cave

15

3

0

0

0

0

61

62


3-Downstream, Wairoa Cave

67

3

0

0

0

9

235

235

 

The total survey length (surface + cave + duplicate) is 140m, and 9m of it
is on the surface.  There is also 3m of survey in there that is duplicated
(happens to be a nosurvey "shot" for a visual-only connection established at
the whole-cave level of survey.

 

Bruce

 

From: Therion <therion-bounces at speleo.sk <mailto:therion-bounces at speleo.sk>
> On Behalf Of Nick Bairstow via Therion
Sent: Thursday, 10 May 2018 3:02 AM
To: List for Therion users <therion at speleo.sk <mailto:therion at speleo.sk> >
Cc: Nick Bairstow <Nick at pff.uk.com <mailto:Nick at pff.uk.com> >
Subject: Re: [Therion] Therion Map Header Overrides

 

Bruce, I have never used flags. I have just been though the Therion book and
wiki for information but for clarification could you post an example of
surface flag use please.  

 

Thanks.

 

Nick

 

 

From: Therion [mailto:therion-bounces at speleo.sk] On Behalf Of Bruce Mutton
via Therion
Sent: 09 May 2018 11:04
To: 'List for Therion users' <therion at speleo.sk <mailto:therion at speleo.sk> >
Cc: Bruce Mutton <bruce at tomo.co.nz <mailto:bruce at tomo.co.nz> >
Subject: [Therion] Therion Map Header Overrides

 

Nick

>  The override below is to change the Therion default team, cave length,
cave depth data on the map output. Used in this case because a short surface
survey needed to be shown on the map but the data was skewing the actual
cave length and depth.

 

I'm not sure that is a very good way to deal with the issue.

In the screenshot below I have a surface survey shown (green dots),
designated surface by use of 'flags surface', 'flags not surface'
interleaved with the survey data as appropriate.  No need to fudge the cave
length or depth because Therion does not include surface data in the cave
length.  

There is some complexity around it, but you can show or hide the cave and
surface centrelines using;

  symbol-show group surface-centreline

  symbol-hide group cave-centreline

Bruce

 



 

 

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