[Therion] Therion Map Header Overrides

[Nick Bairstow]

Thanks Bruce very clear examples of surface flags. I now understand their use.

From: Therion [mailto:therion-bounces at speleo.sk] On Behalf Of Bruce Mutton via Therion
Sent: 09 May 2018 21:02
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_options_for_survey_centrelines<https://therion.speleo.sk/wiki/extend?s%5b%5d=flags#summary_of_all_extend_options_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_examples> 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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