<div><br></div><div dir="auto">Thanks for the clarification Andrea. Reading the threads and pull requests is a fascinating look into the muddy waters of really small numbers and curved areas. </div><div dir="auto"><br><div class="gmail_quote" dir="auto"><div dir="ltr" class="gmail_attr">On Tue, Jan 4, 2022 at 10:07 PM Andrea Giudiceandrea <<a href="mailto:andreaerdna@libero.it">andreaerdna@libero.it</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)">
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<p style="font-size:13px;font-family:helvetica,arial,sans-serif;color:rgb(102,102,102)"><span style="margin-right:0.5em;border-right-width:1px;border-right-style:solid;padding-right:0.8em;font-family:helvetica,arial,sans-serif;border-right-color:rgb(221,221,221)"><a href="https://www.mail-archive.com/search?l=qgis-user@lists.osgeo.org&q=from:%22Sebastian+Gutwein%22" rel="nofollow" style="text-decoration:none;font-family:helvetica,arial,sans-serif;color:rgb(102,102,102)" target="_blank"><span style="font-family:helvetica,arial,sans-serif"><span style="font-family:helvetica,arial,sans-serif">Sebastian Gutwein</span></span></a></span><span style="font-family:helvetica,arial,sans-serif"> </span><span style="font-family:helvetica,arial,sans-serif"><a href="https://www.mail-archive.com/search?l=qgis-user@lists.osgeo.org&q=date:20220103" rel="nofollow" style="text-decoration:none;font-family:helvetica,arial,sans-serif;color:rgb(102,102,102)" target="_blank">Mon, 03 Jan 2022 05:44:08 -0800</a></span></p>
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<pre style="font-family:courier,"courier new",monospace;font-size:1em;white-space:pre-wrap;margin:0px">If I am reading the pull requests
correctly even Grass has switched to the Geographic Lib method.</pre>
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Hi Sebastian,<br>
AFAIK, GRASS GIS has not yet switched to the GeographicLib routines.<br>
See the feature request <a href="https://github.com/OSGeo/grass/issues/1235" target="_blank">https://github.com/OSGeo/grass/issues/1235</a>
not yet closed and the related PR
<a href="https://github.com/OSGeo/grass/pull/1283" target="_blank">https://github.com/OSGeo/grass/pull/1283</a> in draft status and not yet
merged.<br>
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<p style="font-size:13px;font-family:helvetica,arial,sans-serif;color:rgb(102,102,102)"><span style="margin-right:0.5em;border-right-width:1px;border-right-style:solid;padding-right:0.8em;font-family:helvetica,arial,sans-serif;border-right-color:rgb(221,221,221)"><a href="https://www.mail-archive.com/search?l=qgis-user@lists.osgeo.org&q=from:%22Sadowski+Jaros%C5%82aw%22" rel="nofollow" style="text-decoration:none;font-family:helvetica,arial,sans-serif;color:rgb(102,102,102)" target="_blank"><span style="font-family:helvetica,arial,sans-serif"><span style="font-family:helvetica,arial,sans-serif">Sadowski Jarosław</span></span></a></span><span style="font-family:helvetica,arial,sans-serif"> </span><span style="font-family:helvetica,arial,sans-serif"><a href="https://www.mail-archive.com/search?l=qgis-user@lists.osgeo.org&q=date:20220102" rel="nofollow" style="text-decoration:none;font-family:helvetica,arial,sans-serif;color:rgb(102,102,102)" target="_blank">Sun, 02 Jan 2022 23:58:06 -0800</a></span><br>
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<pre style="font-family:courier,"courier new",monospace;font-size:1em;white-space:pre-wrap;margin:0px">I must admit that, for me as a GIS operator, it is surprising and sounds like
bad news - so far surfaces have always been the same in various GIS software,
whether or not it was open-source or commercial (ArcGIS Pro). So from this
moment it will be that I will get different surfaces depending on the software
it was calculated? :(</pre>
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Hi Jarosław,<br>
it seems to me the calculation of a polygon area on the ellipsoid
was always not the same in different GIS software.<br>
See, for example, these long threads at
<a href="https://www.mail-archive.com/qgis-developer@lists.osgeo.org/msg43978.html" target="_blank">https://www.mail-archive.com/qgis-developer@lists.osgeo.org/msg43978.html</a>
and
<a href="https://www.mail-archive.com/qgis-developer@lists.osgeo.org/msg43978.html" target="_blank">https://www.mail-archive.com/qgis-developer@lists.osgeo.org/msg43978.html</a><br>
<br>
Best regards.</div><div><br>
<br>
Andrea Giudiceandrea<br>
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</blockquote></div></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature">Sent from a phone. Amazing! But possibly garbled.
Sebastian Gutwein
Regenerative Design Group
1 Chevalier Ave Greenfield MA
<a href="mailto:Bas@rdgland.com">Bas@rdgland.com</a>
(631) 241-1018</div>