[Therion] Magnetic declination

[Xavier Pennec]

If I remember correctly, the declination is displayed on the log file 
for the beginning of all the years for which you have some survey data, 
but it is interpolated in between these measurements with the exact date 
for each survey environment where you provided a date.

Xavier

Le 02-Mar-18 à 17:22, Martin KERN via Therion a écrit :
> Thanks for your reply Ladislav.
>
> I know that but the automatic declination is calculated for the first 
> januray of the year which is enter, not for the exact date.
> It's not a probleme for the accuracy of the survey ?
>
> Martin K.
>
> Le 2 mars 2018 17:05, "Ladislav Blažek" <ladislav at lblazek.cz 
> <mailto:ladislav at lblazek.cz>> a écrit :
>
>     Hi,
>
>     declination should be calculated automatically based on the survey
>     date.
>     Declination parameter is for manual correction.
>
>     \LB
>
>     2. 3. 2018 v 16:29, Martin KERN via Therion <therion at speleo.sk
>     <mailto:therion at speleo.sk>>:
>
>>     Quick question concerning the magnetic declination.
>>
>>     How you indicate it?
>>
>>     Just by entering the date or with the command <declination>?
>>
>>     Because when I just specify the date, the declination which is
>>     calculate is for the first January, even if I specify another
>>     month in the centreline (e.g. 28.08.2017). Consequently,
>>     centreline is slightly offset that if I enter the real
>>     declination for the date.
>>
>>     I don’t know if this shift is important for survey accuracy or if
>>     I can ignore it ?
>>
>>     Thanks and sorry for all my questions.
>>
>>     Martin K.
>>
>>
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>
>
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-- 
> -------------------------
> Xavier Pennec
> Senior Research Scientist / Directeur de recherche
> Asclepios project-team, INRIA Sophia-Antipolis
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