Happy to help! On Tue, Jan 4, 2022 at 2:04 PM Sadowski Jarosław <jaroslaw.sadow...@cpk.pl> wrote:
> Dear Sebastian, > > > > I am very grateful to you for taking on my case in such depth. > > Now everything is clear to me, thank you kindly for your answer. > > I will spread this knowledge further on local QGIS community and Polish > internet QGIS forums. > > > > with best regards > > and greetings to the entire community of this amazing open-source project > > Jarosław Sadowski > > *_____________________________* > > *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:* Monday, January 3, 2022 3:47 PM > *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> > > 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 > <!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. > > 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%7C72f10e545ec748e873ca08d9cec7e6d0%7Cfa798250ca0b4a1bb47381cff4a1752b%7C1%7C0%7C637768180240837962%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=n9NfD1jSBsKsrD9ujGf50us0H5McoNOnjZTet%2BvXFlo%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%7C72f10e545ec748e873ca08d9cec7e6d0%7Cfa798250ca0b4a1bb47381cff4a1752b%7C1%7C0%7C637768180240837962%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=7md2NSCR87fR2Uhv2tMwrisF9%2FbiulNQH%2BuTPwqCqok%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%7C72f10e545ec748e873ca08d9cec7e6d0%7Cfa798250ca0b4a1bb47381cff4a1752b%7C1%7C0%7C637768180240837962%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=I7pSrQ9eHBnY%2BOq6xN5BTbUV2ZkcJOP0k30teMLdJUk%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%7C72f10e545ec748e873ca08d9cec7e6d0%7Cfa798250ca0b4a1bb47381cff4a1752b%7C1%7C0%7C637768180240837962%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=AcHBFAywXe35DZ3kZWTRk%2FuaUEp145TjOwmJKp7sf64%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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