[Therion] fixed point std error causes extreme survey network distortion

2014-01-08 Thread Roger Schuster
Hi, > Olly Betts hat am 8. Januar 2014 um 02:25 geschrieben: > Bruce asked off-list if there's a way to change how therion calls cavern > on Windows.  I added Survex to PATH (in Windows control panel) and appended "-v7" to the cavern-path variable in therion.ini. The warning "cannot open

[Therion] fixed point std error causes extreme survey network distortion

2014-01-08 Thread Olly Betts
On Tue, Jan 07, 2014 at 02:12:04PM +, Wookey wrote: > +++ Olly Betts [2013-12-27 21:06 +]: > > Survex 1.2.7 introduced a new 3d format version (v8), but it looks like > > therion 5.3.12 wasn't updated to understand this. > > > > Copying over img.h and img.c from the latest Survex sources

[Therion] fixed point std error causes extreme survey network distortion

2014-01-07 Thread Wookey
+++ Olly Betts [2013-12-27 21:06 +]: > On Fri, Dec 27, 2013 at 08:18:18PM +1300, Bruce wrote: > > Since I installed Survex 1.2.8 a few weeks agoi, my machine has been giving; > > > > “C:\Program Files\Therion\therion.exe: warning -- can't open cavern > > output” > > > > when survex loop

[Therion] fixed point std error causes extreme survey network distortion

2013-12-27 Thread Olly Betts
On Fri, Dec 27, 2013 at 08:18:18PM +1300, Bruce wrote: > Since I installed Survex 1.2.8 a few weeks agoi, my machine has been giving; > > “C:\Program Files\Therion\therion.exe: warning -- can't open cavern output” > > when survex loop closure is specified, and I suspect this is causing Therion

[Therion] fixed point std error causes extreme survey network distortion

2013-12-27 Thread Bruce
Below a conversation transcript that I took briefly ‘off forum’, but now time to post it I think. You can read from the bottom of the transcript below if you are interested. Briefly in summary, it seems to me that since 5.3.5 or earlier, therion loop closure results in grossly distorted

[Therion] fixed point std error causes extreme survey network distortion

2013-12-24 Thread Bruce
to try 5.3.12 Bruce _ From: therion-bounces at speleo.sk [mailto:therion-boun...@speleo.sk] On Behalf Of Xavier Pennec Sent: Sunday, 22 December 2013 9:52 p.m. To: therion at speleo.sk Subject: Re: [Therion] fixed point std error causes extreme survey network distortion Hi Bruce, I

[Therion] fixed point std error causes extreme survey network distortion

2013-12-22 Thread Bruce
I got some unexpected results recently when I added some very rough gps coordinates to my survey for a cave that has three entrances. Because they are approximate I added some estimates of standard errors as below, so that I could get Therion to factor the relative accuracy into the loop closure.

[Therion] fixed point std error causes extreme survey network distortion

2013-12-22 Thread Xavier Pennec
Hi Bruce, I have hundreds of fixed points with different accuarcy and never noticed the effect you are describing. However, I am not fixing directly the coordinates of stations of my survey. I always create independant fixed points and then equate them to the survey stations. In your case,