<div dir="ltr"><div><div>Hi Anna,<br><br></div>Thanks for letting us know about this! I've updated the examples in our GitHub repo and sent a patch along to the RFC Editor. When the GeoJSON standard is published, the examples will have the correct orientation: exterior rings that wind counter-clockwise and interior rings that wind clockwise.<br><br>See <a href="https://github.com/geojson/draft-geojson/issues/231">https://github.com/geojson/draft-geojson/issues/231</a> for the specific changes.<br><br></div>Yours,<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jul 14, 2016 at 4:56 AM, Anna Eivazi <span dir="ltr"><<a href="mailto:Anna.Eivazi@sharpershape.com" target="_blank">Anna.Eivazi@sharpershape.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal">Hello geojson-gurus,<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">First of all, thank you for all your good work about geojson, we love to use it!;)<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">I’ve got a question after trying to figure out which orientation to use for polygons.<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">So I’ve read your latest specs:
<u></u><u></u></p>
<p class="MsoNormal"><a href="https://datatracker.ietf.org/doc/draft-ietf-geojson/?include_text=1" target="_blank">https://datatracker.ietf.org/doc/draft-ietf-geojson/?include_text=1</a><u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Here it is said:<u></u><u></u></p>
<pre style="margin-bottom:7.9pt;background:#fffdf5;word-break:break-all"><span style="font-size:10.5pt;color:black">Polygon rings MUST follow the right-hand rule for orientation</span><u></u><u></u></pre>
<pre style="margin-bottom:7.9pt;background:#fffdf5;word-break:break-all"><span style="font-size:10.5pt;color:black"> (counter-clockwise external rings, clockwise internal rings).</span><u></u><u></u></pre>
<p class="MsoNormal">(clear answer to my question, right?)<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">But a bit upper in the same doc Polygon section:<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal" style="margin-bottom:7.9pt;background:#fffdf5;word-break:break-all">
<span style="font-size:10.5pt;font-family:"Courier New";color:black">A.3. Polygons</span><u></u><u></u></p>
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<span style="font-size:10.5pt;font-family:"Courier New";color:black"> </span><u></u><u></u></p>
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<span style="font-size:10.5pt;font-family:"Courier New";color:black"> Coordinates of a Polygon are an array of LinearRing (see</span><u></u><u></u></p>
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<span style="font-size:10.5pt;font-family:"Courier New";color:black"> Section 3.1.6) coordinate arrays. The first element in the array</span><u></u><u></u></p>
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<span style="font-size:10.5pt;font-family:"Courier New";color:black"> represents the exterior ring. Any subsequent elements represent</span><u></u><u></u></p>
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<span style="font-size:10.5pt;font-family:"Courier New";color:black"> interior rings (or holes).</span><u></u><u></u></p>
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<span style="font-size:10.5pt;font-family:"Courier New";color:black"> </span><u></u><u></u></p>
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<span style="font-size:10.5pt;font-family:"Courier New";color:black"> No holes:</span><u></u><u></u></p>
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<span style="font-size:10.5pt;font-family:"Courier New";color:black"> </span><u></u><u></u></p>
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<span style="font-size:10.5pt;font-family:"Courier New";color:black"> {</span><u></u><u></u></p>
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<span style="font-size:10.5pt;font-family:"Courier New";color:black"> "type": "Polygon",</span><u></u><u></u></p>
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<span style="font-size:10.5pt;font-family:"Courier New";color:black"> "coordinates": [</span><u></u><u></u></p>
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<span style="font-size:10.5pt;font-family:"Courier New";color:black"> [</span><u></u><u></u></p>
<p class="MsoNormal" style="margin-bottom:7.9pt;background:#fffdf5;word-break:break-all">
<span style="font-size:10.5pt;font-family:"Courier New";color:black"> [100.0, 0.0],</span><u></u><u></u></p>
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<span style="font-size:10.5pt;font-family:"Courier New";color:black"> [100.0, 1.0],</span><u></u><u></u></p>
<p class="MsoNormal" style="margin-bottom:7.9pt;background:#fffdf5;word-break:break-all">
<span style="font-size:10.5pt;font-family:"Courier New";color:black"> [101.0, 1.0],</span><u></u><u></u></p>
<p class="MsoNormal" style="margin-bottom:7.9pt;background:#fffdf5;word-break:break-all">
<span style="font-size:10.5pt;font-family:"Courier New";color:black"> [101.0, 0.0],</span><u></u><u></u></p>
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<span style="font-size:10.5pt;font-family:"Courier New";color:black"> [100.0, 0.0]</span><u></u><u></u></p>
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<span style="font-size:10.5pt;font-family:"Courier New";color:black"> ]</span><u></u><u></u></p>
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<span style="font-size:10.5pt;font-family:"Courier New";color:black"> ]</span><u></u><u></u></p>
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<span style="font-size:10.5pt;font-family:"Courier New";color:black"> }</span><u></u><u></u></p>
<p class="MsoNormal">That would mean clockwise orientation…?<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">So, which one u are planning to use in future? So we will stick to it too!<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Thanks a lot!<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Best regards,<u></u><u></u></p>
<p class="MsoNormal">Anna Eivazi<u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><u></u> <u></u></span></p>
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<br></blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature" data-smartmail="gmail_signature">Sean Gillies</div>
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