Hi therion people, I’m working on the dataset again with my friend. We’ve found that the survex model uses a compass calibration in some places and are trying to work out if this needs transposing across to the therion model. But in the process I have found out that when we give therion a compass reading it’s always taking off 0.9 to 1 degree from the reading given in the .th data. I’ve just run changes to entrance-boulder in both therion and survex. Below results just for first leg 1-2 No date+compass calib= 133.6 deg survex// 132.6 deg therion Date + no compass calib=131.0 deg survex// 130.1 deg therion No date+no compass calib=131 deg survex// 130deg therion Date + compass calib=133.6 deg survex// 132.7 deg therion So clearly therion is correcting the data 1[] 2[] 13.4[] 131[] 10.0 By always taking one degree off the compass irrespective of what we tell it. (For information: When calibration used survex= *calibrate compass -2.65 // therion= calibrate compass 357.35) Does anyone have any ideas where therion is pulling this 1 degree correction from? Regards, Alastair Gott.
On 26 Feb 2021, at 07:43, A Gott <alastairgott@gmail.com> wrote:
HI Tarquin and Andrew,
Many thanks for that, We were just lost, I think we'll be able to pick it up from here with your helpful guidance. Should just be a case of looking through the .th files and looking for all the 90's
I hope you are both well.
Al.
On Fri, 26 Feb 2021 at 07:33, Andrew Atkinson <andrew@wotcc.org.uk> wrote:
DOWN has been mis-converted into +90 rather than -90, when converting from Survex format to Therion format. Survex: 2213 2212 B 3.49 - DOWN Therion: 2213 2212 3.49 311 90 I'm guessing that error may turn up elsewhere. consort_climax looks similarly wrong. As a point to note -90 and Down at treated differently for clino correction, they can be treated ed the same
From the survex manual
"*infer plumbs on" tells cavern to interpret gradients of +/- 90 degrees as UP/DOWN (so it will not apply the clino correction to them). This is useful when the data has not been converted to have UP and DOWN
Andrew _______________________________________________ Therion mailing list Therion@speleo.sk https://mailman.speleo.sk/listinfo/therion