[Therion] WG: Wanted: Flag to exclude certain legs from loop closure algorithm

[Xavier Pennec]

Hi Michael,

You might find some useful information in old discussions, eg:
http://therion.speleo.narkive.com/JoMgAJuX/standard-deviation-and-survey-grade

The best would be to specify first which general accuracy you estimate 
for "normal" legs, eg:
* grade 3 for unreliable surveys,
* grade 5 for relieable ones.

Assuming grade 5, the statement would be:

data normal from to  length   compass  clino ignoreall

grade BCRA5 ## Stddev of normal legs
WGB26	WGB27	20.5	30	0	

# This leg below has perfect measurements
sd length 0 meter
sd compass 0 degrees
sd clino 0 degrees
WGB27	WGB28	17.1	95	0	

grade BCRA5 ## Back to the stddev of normal legs
WGB28	WGB29	9.5	120	0	


If this does not work, try 0.0001 instead of zero as I remember having 
problems with vanishing stddevs.

Xavier

Le 15-Jun-18 à 13:29, Michael via Therion a écrit :
> Hello Ben,
> Thanks for the hint to use "SD" but I need some more help with that.
>
> For example, I want *only* leg from WGB27 to WGB28 to exclude from modification by Therion's loop closure algorithms.
> What statements do I need to insert at what places to ensure that?
>
> data normal from	to  length   compass  clino ignoreall
>
> WGB26	WGB27	20.5	30	0	
> WGB27	WGB28	17.1	95	0	
> WGB28	WGB29	9.5	120	0	
>
> Michael.
>
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> Xavier Pennec
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