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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. <br>
<br>
Xavier<br>
<br>
<div class="moz-cite-prefix">Le 02-Mar-18 à 17:22, Martin KERN via
Therion a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:CAPXMhw54+bhsVxYgi0d7TQsj2vpfSfZwXB3qNd1-iqM_sZGGkA@mail.gmail.com">
<div dir="auto">Thanks for your reply Ladislav.
<div dir="auto"><br>
</div>
<div dir="auto">I know that but the automatic declination is
calculated for the first januray of the year which is enter,
not for the exact date.</div>
<div dir="auto">It's not a probleme for the accuracy of the
survey ? </div>
<div dir="auto"><br>
</div>
<div dir="auto">Martin K. </div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">Le 2 mars 2018 17:05, "Ladislav Blažek"
<<a href="mailto:ladislav@lblazek.cz"
moz-do-not-send="true">ladislav@lblazek.cz</a>> a écrit :<br
type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="auto">Hi,
<div><br>
</div>
<div>declination should be calculated automatically based
on the survey date.</div>
<div>Declination parameter is for manual correction.<br>
<br>
<div id="m_3203758605353509778AppleMailSignature">\LB</div>
<div><br>
2. 3. 2018 v 16:29, Martin KERN via Therion <<a
href="mailto:therion@speleo.sk" target="_blank"
moz-do-not-send="true">therion@speleo.sk</a>>:<br>
<br>
</div>
<blockquote type="cite">
<div>
<div id="m_3203758605353509778bloop_customfont"
style="font-family:Helvetica,Arial;font-size:13px;color:rgba(0,0,0,1.0);margin:0px;line-height:auto">
<p class="MsoNormal"><span lang="EN-GB">Quick
question concerning the magnetic declination.</span></p>
<p class="MsoNormal">How you indicate
it?</p>
<p class="MsoNormal"><span lang="EN-GB">Just by
entering
the date or with the command
<declination>?</span></p>
<p class="MsoNormal"><span lang="EN-GB">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.</span></p>
<p class="MsoNormal"><span lang="EN-GB">I don’t
know if this shift is important for survey
accuracy or if I can ignore it ?</span></p>
<p class="MsoNormal"><span lang="EN-GB"> </span></p>
<p class="MsoNormal"><span lang="EN-GB">Thanks and
sorry for all my questions.</span></p>
<p class="MsoNormal"><span lang="EN-GB">Martin K.</span></p>
</div>
<br>
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<pre class="moz-signature" cols="72">--
> -------------------------
> Xavier Pennec
> Senior Research Scientist / Directeur de recherche
> Asclepios project-team, INRIA Sophia-Antipolis
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