<div dir="ltr"><div dir="ltr"><div>There was some discussion on this in the list serve back in <a href="https://lists.osgeo.org/pipermail/qgis-user/2021-January/047638.html ">January</a> that resulted in this <a href="https://github.com/qgis/QGIS/issues/40888">feature request</a> and this <a href="https://github.com/qgis/QGIS/pull/41726">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. <br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Dec 31, 2021 at 6:49 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:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="MsoNormal"><span lang="EN-US">Dear all,<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 am asking for help with QGIS error/bug or verification of proper usage of basic QGIS functionality “$area”.<u></u><u></u></span></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).<u></u><u></u></span></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://cpkonline-my.sharepoint.com/:u:/g/personal/jaroslaw_sadowski_cpk_pl/EVs0-TiEvPdBjMaqXrEvGfoBI0VussbJaYHdDVFfQnEYug?e=VDY3rf-" target="_blank">
<span class="gmail-m_3816491611475617409MsoSmartlink"><img style="width: 0.1666in; height: 0.1666in;" id="gmail-m_3816491611475617409Obraz_x0020_1" src="cid:17e142dc50b4cff311" alt="Ikona zip" width="16" height="16" border="0"> 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.<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">with wishes for more success in the new year<u></u><u></u></span></p>
<p class="MsoNormal">Jarosław Sadowski<u></u><u></u></p>
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<p style="font-size:9pt;font-family:Arial;color:rgb(16,43,77)"><font style="color:rgb(16,43,77)" face="Calibri"><b style="font-size:10pt;color:rgb(16,43,77)">Jarosław Sadowski</b><br><span style="font-family:Calibri;color:rgb(16,43,77)">Ekspert ds. Baz Danych i Analiz Przestrzennych
| </span></font><i style="font-family:Calibri;color:rgb(87,87,87)">Biuro Strategii i Planowania, Projektowania i Inżynierii Podprogramu Kolejowego</i><br><span style="font-family:Calibri;color:rgb(16,43,77)"><i>Database and Spatial Analysis Expert
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