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<p>Hi Andrea,</p>
<p>Nice shortcut - and use of the modulus operator! Now the calculation is really short!</p>
<p>Nevertheless it would be kind of nice to have a QGIS expression function to convert azimuth into math angles. I assume that Christine wouldn't be the only one looking for this calculation.</p>
<p>Christine - do you want to create a feature request for such an expression function at <a href="https://github.com/qgis/QGIS/issues">https://github.com/qgis/QGIS/issues</a> ?</p>
<p>Andreas</p>
<p id="reply-intro">On 2021-12-07 08:49, Andrea Giudiceandrea wrote:</p>
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<p class="v1darkgray v1font13" style="font-size: 13px; color: #666666;"><span class="v1sender v1pipe" style="margin-right: 0.5em; border-right: 1px solid #dddddd; padding-right: 0.8em;"><a style="color: #666666; text-decoration: none;" href="https://www.mail-archive.com/search?l=qgis-user@lists.osgeo.org&q=from:%22Richard+Greenwood%22" target="_blank" rel="noopener noreferrer"><span><span>Richard Greenwood</span></span></a></span><span> </span><span class="v1date"><a style="color: #666666; text-decoration: none;" href="https://www.mail-archive.com/search?l=qgis-user@lists.osgeo.org&q=date:20211206" target="_blank" rel="noopener noreferrer">Mon, 06 Dec 2021 10:57:06 -0800</a></span></p>
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<pre style="font-family: courier, 'courier new', monospace; font-size: 1em; white-space: pre-wrap; overflow-wrap: break-word; margin: 0px;">g = (450-m) - int((450-m) / 360) * 360
where m = mathematical angle (0 east, anti-clockwise)
and g = geographic angle (0 north, clockwise)</pre>
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<br />Which is equivalent to:<br /><br />g = (450-m) % 360<br /><br /><br />Best regards.<br /><br />Andrea Giudiceandrea</div>
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