Thanks for your prompt and detailed reply! On Fri, Feb 19, 2021 at 5:32 PM Andrea Giudiceandrea <[email protected]> wrote:
> dr wrote > > So I would say it seems like an error in the area calculation algorithm > in > > QGIS. > > Hi, > there is no unique way to calculate the geodesic area. > > For example, PROJ use a C implementation of the GeographicLib algorithm, > while QGIS uses the same algorithm used by GRASS, SpatiaLite 5 uses RTTOPO > library and PostGIS uses GeographicLib. > > See this recent threed > > http://osgeo-org.1560.x6.nabble.com/Confusion-with-ellipsoidal-method-of-area-td5454013.html > on the same topic. > There are two feature requests for QGIS and GRASS: > https://github.com/qgis/QGIS/issues/40888 > https://github.com/OSGeo/grass/issues/1235 > and a Pull Request in GRASS https://github.com/OSGeo/grass/pull/1283. > > So it look like there is the possibility that GRASS will switch to use the > same C implementation of the GeographicLib algorithm used by PROJ. > > Regards. > > Andrea > > > > -- > Sent from: > http://osgeo-org.1560.x6.nabble.com/QGIS-Developer-f4099106.html > _______________________________________________ > QGIS-Developer mailing list > [email protected] > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer >
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