Re: [Therion] Multiple fixes for the same point

2017-09-07 Thread Martin Sluka via Therion
To average it before (in GPS software) and to add all three as comment? m.s. On Sep 07, 2017, at 02:08 PM, Andrew Atkinson via Therion wrote: 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

[Therion] Multiple fixes for the same point

2017-09-07 Thread Andrew Atkinson via Therion
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

Re: [Therion] Multiple fixes for the same point

2017-09-07 Thread Andrew Atkinson via Therion
Yes I could do that, but it does not feel very elegant, and not really the way you should do it, it would be the equivalent of reversing all backwards legs and adding the original as a comment Andrew On 07/09/17 13:46, Martin Sluka via Therion wrote: > > To average it before (in GPS software)

Re: [Therion] Multiple fixes for the same point

2017-09-07 Thread Wookey via Therion
On 2017-09-07 13:07 +0100, Andrew Atkinson via Therion wrote: > 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. >

Re: [Therion] Multiple fixes for the same point

2017-09-07 Thread Martin Sluka via Therion
Way to coerce Therion to to substitute GPS software? m.s. On Sep 07, 2017, at 03:01 PM, Andrew Atkinson via Therion wrote: Yes I could do that, but it does not feel very elegant, and not really the way you should do it, it would be the equivalent of reversing all backwards

Re: [Therion] Multiple fixes for the same point

2017-09-07 Thread Andrew Atkinson via Therion
On 07/09/17 14:23, Wookey via Therion wrote: > I've wanted to do this too, but wasn't sure how. > > From *FIX on https://survex.com/docs/manual/datafile.htm > > The standard errors default to zero (fix station exactly). cavern > will give an error if you attempt to fix the same survey

Re: [Therion] Multiple fixes for the same point

2017-09-07 Thread Xavier Pennec via Therion
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

Re: [Therion] Multiple fixes for the same point

2017-09-07 Thread Bruce Mutton via Therion
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

Re: [Therion] Multiple fixes for the same point

2017-09-07 Thread Wookey via Therion
On 2017-09-07 14:46 +0100, Andrew Atkinson via Therion wrote: > On 07/09/17 14:23, Wookey via Therion wrote: > > I've wanted to do this too, but wasn't sure how. > > > > Alternatively you can give them different names (with variances), then > > equate them. > > Okay that probably will get round

Re: [Therion] Multiple fixes for the same point

2017-09-07 Thread Philippe Vernant via Therion
Andrew, GPS coordinates should come with uncertainties. If nothing went wrong when you took the coordinates, they should all be within their uncertainties. They could all be very close from each others but still be off the exact coordinates (that is the difference between accuracy and