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-bounces@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 <andrew@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
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