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<p><font face="Helvetica, Arial, sans-serif">Hi</font></p>
<p><font face="Helvetica, Arial, sans-serif">Thanks for your effort!</font></p>
<p><font face="Helvetica, Arial, sans-serif">At least for me, this
is already a huge improvement. Extrapolating into the future is
ok for me and would have avoided my problem, so I guess the most
important points have been adressed.</font></p>
<br>
<div class="moz-cite-prefix">On 06.10.2020 21:10, Martin Budaj
wrote:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">> I would
propose:<br>
> <br>
> 1. If a survey is dated but is newer than
available correction data,<br>
> build should fail with a message like:<br>
> "Error determining magnetic declination for
survey <name> with date<br>
> <date>. Please specify the declination
explicitly using for example<br>
> 'declination 3 deg'"<br>
> instead of the (completely wrong)<br>
> "unable to determine magnetic declination
for undated surveys"<br>
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<div>We have discussed it with Stacho and the following
seems to be the best approach:</div>
<div><br>
</div>
<div>IGRF models are designed to predict over the 5 year
period (IGRF 13 released at the end of 2019 is intended
to be used to predict the declination up to the end of
2024, when a new version, IGRF 14 will be released). In
Therion, we will allow to use the model for additional 5
years (using linear extrapolation) and produce a warning
(so IGRF 13 could be used until the end of 2029). After
2029, more firm warnings will be produced if Therion
still uses IGRF 13, but we don't expect anybody to use
such an outdated Therion.</div>
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<font face="Helvetica, Arial, sans-serif">The only suggestion I'd
have is not only issuing a warning but fail the build. In my case
I'm starting it from xtherion (on Windows). Warnings do not pop
out there at all, you even only see a part of the output unless
you start scrolling, so it's even likely that such a warning will
not be seen at all - I also only found the other warning in
therion 5.4.4 by chance, as I don't usually examine the output
very closely as long as it runs through.</font>
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<div>On the other hand: is there any need to use the data
older than 1900? If yes, we could implement the GUFM1
model covering the period 1590–1890.</div>
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At least for me, I don't think I have performed any surveys before
1900, or at least, I cannot remember that ;)<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
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> 2. If at least one of the imported (and thus
joined) surveys has magnetic<br>
> data but at least one does not (or cannot be
determined), an error<br>
> shall be thrown as well, because mixing
corrected and uncorrected<br>
> surveys is just plain wrong and causes a lot
of confusion (as it has<br>
> happened to me). The same error message
shall be displayed and the<br>
> build fails.<br>
</blockquote>
<div> </div>
<div>You can't always avoid mixing dated and undated
surveys (sometimes the older survey data might be
undated), so using the min(survey_dates) as a proxy for
undated surveys (and producing a warning as well) should
be a reasonable approach.</div>
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<p>I can see your point and for me that's ok - because I don't have
any undated surveys; I would just find it more consistent the
other way - mainly because I'm not a huge fan of warning messages
that are hard to spot.</p>
<p>Thanks for all your effort</p>
<p>Matt<br>
</p>
<blockquote type="cite"
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