Hi Bruce,
Good that you found my previous post. I knew I wrote something on it but
I could not remember when.
I also remenber that the therion loop closure algorithm was inducing
(sometimes) very large errors while the survex loop closure was working
perfectly. I am not sure that it was for this case, but I am personnaly
taking care of installing survex for loop closure: the last experience I
had without survex installed last November was still showing the problem
(coordinates too large to be able to produce the pdf).
Xavier
Le 07-Sep-17 à 21:42, Bruce Mutton via Therion a écrit :
Andrew
I have been doing this for years, and pretty sure it is working fine, no errors
or warnings flagged by Therion at least. Although I have not checked that the
weighted averaging of the positions appears to be working correctly for about 5
years now, so there is a possibility it has got broken in the meantime. However
nothing gross is happening or I would have noticed.
There were some issues and work arounds that were discussed on the forum.
https://www.mail-archive.com/therion@speleo.sk/msg03747.html Olly on Survex Jan
2012
https://www.mail-archive.com/therion@speleo.sk/msg03750.html Describing the
characteristics
https://www.mail-archive.com/therion@speleo.sk/msg03751.html Stacho looking
into it
https://www.mail-archive.com/therion@speleo.sk/msg04327.html Xaviers solution
Dec 2013
I vaguely recall that the multiple fixes did start turning up in loop
reporting, as Satcho described, but I'm not sure about that - could be
imagination.
I think it is appropriate functionality for Therion. Over time many position
fixes on a station, usually in different surveys, all with their own std
errors. Therion as far as I know handles these just fine, averaging
appropriately. If it does not, then something is broken.
At least two datasets where I do this are still in active use, if I get time I
will make sure all is still well.
I think it is a topic that deserves a wiki FAQ or Tips and Tricks entry
Bruce
-----Original Message-----
From: Therion [mailto:therion-boun...@speleo.sk] On Behalf Of Andrew Atkinson
via Therion
Sent: Friday, 8 September 2017 12:08 AM
To: List for Therion users <therion@speleo.sk>
Cc: Andrew Atkinson <and...@wotcc.org.uk>
Subject: [Therion] Multiple fixes for the same point
I'm sure that this has been covered, but I cannot find it anywhere.
I have 3 different gps results for a surface point, all taken with the same gps
but on different days, so rather then picking one I just used fix on all 3.
However, therion appears to be taking only the last one I enter.
This does not seem to be the right behaviour! Is there a way for Therion to
take all 3 and 'average' them?
thanks in advance
Andrew
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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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