<div dir="auto">Yes that was my read as well except previously it was the Grass method and now it is Geographic Lib method because that is theoretically more accurate and is the same method that is used in Postgis and other places. The switched happened because someone noticed the difference between QGIS’s calculations and Postgis’s calculations. If I am reading the pull requests correctly even Grass has switched to the Geographic Lib method. I’m surprised that ArcGIS Pro uses the same method as the Grass method. </div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jan 3, 2022 at 2:57 AM Sadowski Jarosław <<a href="mailto:jaroslaw.sadowski@cpk.pl">jaroslaw.sadowski@cpk.pl</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 class="MsoNormal"><span lang="EN-US">Sebastian,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">thank you very much for your precise answer and materials sent - I have read them carefully.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">So, as far as I can understand, QGIS has moved in version 3.20 to a new way of counting areas (other libraries? GRASS algorithm instead of Geographic lib? I have actually noticed a different
nomenclature and definition of EPSG 2180 for some time in new versions…), that will be more accurate?<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">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? :(<br>
<br>
with kind regards<br>
JS<u></u><u></u></span></p>
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<p style="font-size:9pt;font-family:Arial"><font style="font-family:Calibri;color:rgb(0,0,0)" face="Calibri"><strong style="font-family:Calibri;color:rgb(16,43,77)">_____________________________</strong></font></p>
<p style="font-size:9pt;font-family:Arial;color:rgb(16,43,77)"><font style="font-family:Calibri;color:rgb(16,43,77)" face="Calibri"><strong style="font-size:10pt;font-family:Calibri;color:rgb(16,43,77)">Jarosław Sadowski</strong><br><span style="font-family:Calibri;color:rgb(16,43,77)">Ekspert ds. Baz Danych i Analiz Przestrzennych | </span></font><em style="font-family:Calibri;color:rgb(87,87,87)">Biuro Strategii i Planowania, Projektowania i Inżynierii Podprogramu Kolejowego</em><br><span style="font-family:Calibri;color:rgb(16,43,77)"><em style="font-family:Calibri;color:rgb(16,43,77)">Database and Spatial Analysis Expert
|Railway Subprogramme Strategy & Planning, Design & Engineering Department</em><br></span><span style="font-size:9pt;font-family:Calibri;color:rgb(16,43,77)">e: <a style="font-size:9pt;font-family:Calibri;color:rgb(16,43,77)" href="mailto:jaroslaw.sadowski@cpk.pl" target="_blank">jaroslaw.sadowski@cpk.pl</a></span></p>
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<p class="MsoNormal"><b>From:</b> Sebastian Gutwein <<a href="mailto:bas@rdgland.com" target="_blank">bas@rdgland.com</a>> <br>
<b>Sent:</b> Saturday, January 1, 2022 7:13 AM<br>
<b>To:</b> Sadowski Jarosław <<a href="mailto:jaroslaw.sadowski@cpk.pl" target="_blank">jaroslaw.sadowski@cpk.pl</a>><br>
<b>Cc:</b> <a href="mailto:qgis-user@lists.osgeo.org" target="_blank">qgis-user@lists.osgeo.org</a><br>
<b>Subject:</b> Re: [Qgis-user] Wrong area count QGIS 3.20+?<u></u><u></u></p>
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<span style="font-size:9pt;font-family:"Segoe UI",sans-serif;color:rgb(33,33,33)">Nie otrzymujesz często wiadomości e-mail z adresu
<a href="mailto:bas@rdgland.com" target="_blank" style="font-family:"Segoe UI",sans-serif">bas@rdgland.com</a>. <a href="http://aka.ms/LearnAboutSenderIdentification" target="_blank" style="font-family:"Segoe UI",sans-serif">
Dowiedz się, dlaczego jest to ważne</a><u style="font-family:"Segoe UI",sans-serif"></u><u style="font-family:"Segoe UI",sans-serif"></u></span></p>
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<p class="MsoNormal">There was some discussion on this in the list serve back in <a href="https://eur06.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.osgeo.org%2Fpipermail%2Fqgis-user%2F2021-January%2F047638.html&data=04%7C01%7Cjaroslaw.sadowski%40cpk.pl%7Cf7cc24b07b7c42e8902a08d9ccedca61%7Cfa798250ca0b4a1bb47381cff4a1752b%7C1%7C0%7C637766145287655707%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=bUHOuswrG6tPdkebzFYem%2BVsSrgjFhbSLVcKCiu6TW0%3D&reserved=0" target="_blank">
January</a> that resulted in this <a href="https://eur06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fqgis%2FQGIS%2Fissues%2F40888&data=04%7C01%7Cjaroslaw.sadowski%40cpk.pl%7Cf7cc24b07b7c42e8902a08d9ccedca61%7Cfa798250ca0b4a1bb47381cff4a1752b%7C1%7C0%7C637766145287655707%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=dY89NsDscjybmwQPMV9PjPOwckPlcv%2B8TEWjl69rTtM%3D&reserved=0" target="_blank">
feature request</a> and this <a href="https://eur06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fqgis%2FQGIS%2Fpull%2F41726&data=04%7C01%7Cjaroslaw.sadowski%40cpk.pl%7Cf7cc24b07b7c42e8902a08d9ccedca61%7Cfa798250ca0b4a1bb47381cff4a1752b%7C1%7C0%7C637766145287655707%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=IRMFsaJYT7xpylDJCZNvXAUNzdmtTjNbI4VyQMKtedE%3D&reserved=0" target="_blank">
pull request</a>. I tested your polygon, to the best of my limited ability, and the areas were indeed different in QGIS 3.16 and 3.22 as would be expected from that change . However it would be hoped that the area measurement would be more accurate in 3.22.
<u></u><u></u></p>
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<p class="MsoNormal">On Fri, Dec 31, 2021 at 6:49 AM Sadowski Jarosław <<a href="mailto:jaroslaw.sadowski@cpk.pl" target="_blank">jaroslaw.sadowski@cpk.pl</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal"><span lang="EN-US">Dear all,</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US">I am asking for help with QGIS error/bug or verification of proper usage of basic QGIS functionality “$area”.</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US">From version 3.20 upwards, it counts areas differently than before (3.18 calculated area is different than 3.20). Up to version 3.18 everything was fine, equal
to calculations from ArcGIS Pro (geodesic mode).</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US">Anyone have an idea where the differences come from?<br>
This is example vector <a href="https://eur06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcpkonline-my.sharepoint.com%2F%3Au%3A%2Fg%2Fpersonal%2Fjaroslaw_sadowski_cpk_pl%2FEVs0-TiEvPdBjMaqXrEvGfoBI0VussbJaYHdDVFfQnEYug%3Fe%3DVDY3rf-&data=04%7C01%7Cjaroslaw.sadowski%40cpk.pl%7Cf7cc24b07b7c42e8902a08d9ccedca61%7Cfa798250ca0b4a1bb47381cff4a1752b%7C1%7C0%7C637766145287655707%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=JlPtyjeeYHQxV0DdlGrsPwjTNy9FHqqyEqEpLNrian8%3D&reserved=0" target="_blank">
<span class="m_8290114057573456580MsoSmartlink"><img border="0" src="cid:17e20235ad1ad7999131" alt="Ikona zip" style="width:16px;max-width:100%"> PL_2180.zip</span></a>: Polish borders in EPSG: 2180,
in the table of attributes you can see the areas (hectares) calculated for different versions of the software.</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US">with wishes for more success in the new year</span><u></u><u></u></p>
<p class="MsoNormal">Jarosław Sadowski<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p><b><span style="font-size:9pt;color:rgb(61,60,63)">_________________________________</span></b><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(61,60,63)"><u style="font-family:Arial,sans-serif"></u><u style="font-family:Arial,sans-serif"></u></span></p>
<p><b><span style="font-size:10pt;color:rgb(16,43,77)">Jarosław Sadowski</span></b><span style="font-size:9pt;color:rgb(16,43,77)"><br>
Ekspert ds. Baz Danych i Analiz Przestrzennych | </span><i><span style="font-size:9pt;color:rgb(87,87,87)">Biuro Strategii i Planowania, Projektowania i Inżynierii Podprogramu Kolejowego</span></i><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(16,43,77)"><br>
</span><i><span style="font-size:9pt;color:rgb(16,43,77)">Database and Spatial Analysis Expert | Railway Subprogramme Strategy & Planning, Design & Engineering Department</span></i><span style="font-size:9pt;color:rgb(16,43,77)"><br>
e: <a href="mailto:jaroslaw.sadowski@cpk.pl" target="_blank"><span style="color:rgb(16,43,77)">jaroslaw.sadowski@cpk.pl</span></a><br>
m: +48 532 720 230</span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(16,43,77)"><u style="font-family:Arial,sans-serif"></u><u style="font-family:Arial,sans-serif"></u></span></p>
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<p><span style="font-size:5pt;font-family:Arial,sans-serif"><img border="0" src="cid:17e20235ad111bfad142" style="width:192px;max-width:100%"></span><span style="font-size:5pt;font-family:Arial,sans-serif"><u style="font-family:Arial,sans-serif"></u><u style="font-family:Arial,sans-serif"></u></span></p>
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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>