<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Hi,<div>QGIS uses Cartesian or ellipsoid measures (the latest is the default and it’s based on the crs). Difference between QGIS version come from resent refinements on how QGIS deals with projections. Some differences comes from your default setting. Hope this helps.<br><br></div><div><a href="https://docs.qgis.org/3.16/en/docs/user_manual/introduction/general_tools.html#measuring">https://docs.qgis.org/3.16/en/docs/user_manual/introduction/general_tools.html#measuring</a></div><div><br></div><div><br><div dir="ltr">Nicolas Cadieux<div><a href="https://gitlab.com/njacadieux">https://gitlab.com/njacadieux</a></div></div><div dir="ltr"><br><blockquote type="cite">Le 31 déc. 2021 à 06:50, Sadowski Jarosław <jaroslaw.sadowski@cpk.pl> a écrit :<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
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<p class="MsoNormal"><span lang="EN-US">Dear all,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></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”.<o:p></o:p></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).<o:p></o:p></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-">
<span class="MsoSmartlink"><div><image001.png></div> 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.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">with wishes for more success in the new year<o:p></o:p></span></p>
<p class="MsoNormal">Jarosław Sadowski<o:p></o:p></p>
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<p style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; COLOR: #102b4d"><font style="COLOR: #102b4d" face="Calibri"><strong style="FONT-SIZE: 10pt; COLOR: #102b4d">Jarosław Sadowski</strong><br><span style="FONT-FAMILY: Calibri; COLOR: #102b4d">Ekspert ds. Baz Danych i Analiz Przestrzennych
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