First when you say calibration, you do mean calibration not declination, (or calibrate declination, which is an older form of declination) which have slightly different functions? There is more about these in the documentation, which can be useful when dealing with old data sets.
I started a quick test hoping this would only take 5 mins, but got no where, but found something interesting, I have run out of time, not read the manual etc, so just putting this up as it could be useful I produced two files identical except in the annoying format differences. See below I was expecting to see some difference between the 1980 and 220 as the declination has moved about 3° I was interested to see what happened to the no date one. However, the answer was nothing happened everything came out the same, with not adjustment, both in survex and therion. I noticed I didn't get a list of declinations, so ran one of my older files, and it was there geomag declinations (deg): 2010.1.1 -2.6622 2011.1.1 -2.4922 So at some point I knew what I was doing, but now I don't, but there are no errors and no way to tell its not working! Now I think that the problem with Therion is it is doing something weird with the date. Happily accepts date 9999999 or date 999.11 Not happy with date 99.99999 invalid date month Goodness know how it is interpreting those Survex give a sensible error message about the dates that can be use. Andrew Therion 5.5.7 survey all equate 1@2020 1@nodate 1@1980 survey 2020 centerline cs OSGB:ST date 2020 data normal from to tape compass clino 1 2 15 90 0 2 3 10 180 0 endcentreline endsurvey survey nodate centerline cs OSGB:ST data normal from to tape compass clino 1 2 15 90 0 2 3 10 180 0 endcentreline endsurvey survey 1980 centerline cs OSGB:ST date 1980 data normal from to tape compass clino 1 2 15 90 0 2 3 10 180 0 endcentreline endsurvey endsurvey Survex *Begin all *Equate 2020.1 nodate.1 1980.1 *Begin 2020 *cs OSGB:ST *date 2020 *Data normal from to tape compass clino 1 2 15 90 0 2 3 10 180 0 *End 2020 *Begin nodate *Data normal from to tape compass clino *cs OSGB:ST 1 2 15 90 0 2 3 10 180 0 *End nodate *Begin 1980 *cs OSGB:ST *Date 1980 *Data normal from to tape compass clino 1 2 15 90 0 2 3 10 180 0 *End 1980 *End all On 15/03/2021 14:45, Alastair Gott wrote: > 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 <alastairg...@gmail.com > <mailto:alastairg...@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 <and...@wotcc.org.uk >> <mailto:and...@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 <mailto:Therion@speleo.sk> >> https://mailman.speleo.sk/listinfo/therion >> <https://mailman.speleo.sk/listinfo/therion> >> > > _______________________________________________ > Therion mailing list > Therion@speleo.sk > https://mailman.speleo.sk/listinfo/therion > _______________________________________________ Therion mailing list Therion@speleo.sk https://mailman.speleo.sk/listinfo/therion
