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
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/
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