On Wed, 6 Apr 2022 at 09:34, Greg Troxel via Qgis-user <qgis-user@lists.osgeo.org> wrote: > > Jorge Gustavo Rocha via Qgis-user <qgis-user@lists.osgeo.org> writes: > > > I need you help to understand how scale works with geographic > > coordinate systems.
In all cases (projected OR geographic) the scalebar logic is: 1. Create a horizontal line across the width of the layout map 2. Calculate the length of that line using great circle/ellipsoidal calculations, based on the project's ellipsoid settings. 3. Compare the length of the ellipsoidal line vs the map width to calculate the corresponding scale So qgis scalebar calculations are ALWAYS based on great circle/ellipsoidal lengths*. Nyall * Unless the project itself is set to not use ellipsoidal calculations and only use planar calculations, in the project properties dialog _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
