Hi Michael, You might find some useful information in old discussions, eg: http://therion.speleo.narkive.com/JoMgAJuX/standard-deviation-and-survey-gra... 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 Senior Research Scientist / Directeur de recherche Asclepios project-team, INRIA Sophia-Antipolis 2004 Route des Lucioles, BP93 F-06902 Sophia-Antipolis Cedex, France +33 4 92 38 76 64 +33 6 78 35 16 90 http://www-sop.inria.fr/asclepios/ -------------------------------