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Paul,
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<div class="">Not eactly what you were asking for, but this service will output a standardized declination Arrow based on the location in LAT/LON and a DATE of capture for magnetic north (It keeps moving) :
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<div class=""><a href="https://mdd.sharedgeo.org/mdd-gen?date=2016.5&lat=44.95&lon=-93.1&zone=15" class="">https://mdd.sharedgeo.org/mdd-gen?date=2016.5&lat=44.95&lon=-93.1&zone=15</a></div>
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<div class="">It’s intended for automated map making. I thinkk there is a link around that may also output the particulars of the settings used for the image output. I know it exists, but I think it’s still in development.</div>
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<div class="">bobb</div>
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<div class="">On Feb 7, 2020, at 8:14 AM, <a href="mailto:paul.malm@lfv.se" class="">
paul.malm@lfv.se</a> wrote:</div>
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<strong class=""><span style="font-family: Calibri, sans-serif; color: rgb(255, 51, 51);" class="">Think Before You Click:<span class="Apple-converted-space"> </span></span></strong>This email originated<span class="Apple-converted-space"> </span><strong class="">outside<span class="Apple-converted-space"> </span></strong>our
organization.<o:p class=""></o:p></div>
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<span lang="EN-US" class="">Hi, list!<o:p class=""></o:p></span></div>
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<span lang="EN-US" class="">I’m writing a program reading a file and creating graphical objects.<o:p class=""></o:p></span></div>
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<span lang="EN-US" class="">I have a starting point (lat/lon WGS 84), a length (m) and a magnetic bearing (degrees).<o:p class=""></o:p></span></div>
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<span lang="EN-US" class="">I would like to automatically convert the magnetic bearing to a true bearing when they occurs in the file I’m reading.<o:p class=""></o:p></span></div>
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<span lang="EN-US" class="">Is there a converter in PostGis that can be used, or is there another way my program can get the declamation? <o:p class=""></o:p></span></div>
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<span lang="EN-US" class="">Kind regard,<o:p class=""></o:p></span></div>
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<span lang="EN-US" class="">Paul<o:p class=""></o:p></span></div>
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