Ok to add to the fun I tried the calculations in ArcPro and interestingly if I run it using calculate field with this expression *!shape.geodesicArea@hectares!* I get the QGIS 3.22 value of 31271112 but if I run Geoprossessing Add Geometry Attributes I get the QGIS 3.16 value of 31271108. [image: image.png] So if you want them to match I guess you should use the python expression in ArcGIS Pro!
I guess we are back to the old adage of All Measuring is Guessing. -Bas On Mon, Jan 3, 2022 at 8:43 AM Sebastian Gutwein <b...@rdgland.com> wrote: > 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. > > On Mon, Jan 3, 2022 at 2:57 AM Sadowski Jarosław <jaroslaw.sadow...@cpk.pl> > wrote: > >> Sebastian, >> >> >> >> thank you very much for your precise answer and materials sent - I have >> read them carefully. >> >> >> >> 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? >> >> >> >> 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? :( >> >> with kind regards >> JS >> >> *_____________________________* >> >> *Jarosław Sadowski* >> Ekspert ds. Baz Danych i Analiz Przestrzennych | *Biuro Strategii i >> Planowania, Projektowania i Inżynierii Podprogramu Kolejowego* >> *Database and Spatial Analysis Expert |Railway Subprogramme Strategy & >> Planning, Design & Engineering Department* >> e: jaroslaw.sadow...@cpk.pl >> >> *From:* Sebastian Gutwein <b...@rdgland.com> >> *Sent:* Saturday, January 1, 2022 7:13 AM >> *To:* Sadowski Jarosław <jaroslaw.sadow...@cpk.pl> >> *Cc:* qgis-user@lists.osgeo.org >> *Subject:* Re: [Qgis-user] Wrong area count QGIS 3.20+? >> >> >> >> Nie otrzymujesz często wiadomości e-mail z adresu b...@rdgland.com. Dowiedz >> się, dlaczego jest to ważne >> <http://aka.ms/LearnAboutSenderIdentification> >> >> There was some discussion on this in the list serve back in January >> <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> >> that resulted in this feature request >> <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> >> and this pull request >> <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>. >> 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. >> >> >> >> >> >> On Fri, Dec 31, 2021 at 6:49 AM Sadowski Jarosław < >> jaroslaw.sadow...@cpk.pl> wrote: >> >> Dear all, >> >> >> >> I am asking for help with QGIS error/bug or verification of proper usage >> of basic QGIS functionality “$area”. >> >> 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). >> >> Anyone have an idea where the differences come from? >> This is example vector [image: Ikona zip] PL_2180.zip >> <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>: >> Polish borders in EPSG: 2180, in the table of attributes you can see the >> areas (hectares) calculated for different versions of the software. >> >> >> >> with wishes for more success in the new year >> >> Jarosław Sadowski >> >> >> >> *_________________________________* >> >> *Jarosław Sadowski* >> Ekspert ds. 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Amazing! But possibly garbled. Sebastian Gutwein > Regenerative Design Group 1 Chevalier Ave Greenfield MA b...@rdgland.com > (631) 241-1018 >
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