Patrick Dunford via Qgis-user <qgis-user@lists.osgeo.org> writes: > On 6/04/22 11:34, Greg Troxel via Qgis-user wrote: >> Jorge Gustavo Rocha via Qgis-user <qgis-user@lists.osgeo.org> writes: >> >> 2) Using a geographic CRS, the same 150mm x 150mm map, at the same >>> 1:10000 scale, the area is bigger then the 1500m polygon. The result >>> is attached https://nextcloud.geomaster.pt/index.php/s/H2eAytsPANyxn6Y >>> >>> On both layouts the scale bar widget is working properly. The >>> distances (and areas) are properly calculated in QGIS interface. I >>> have set the GRS 1980 ellipsoid for distance and area calculations. >> What does it mean to use a geographic CRS for a print layout? Do you >> really expect longitude on the x axis and latitude on the y axis? The >> value of meters/degree is different for x and y, unless you are at or >> near the equator. (Living at 42N-ish, I'm very aware of this.) > > This may be the case for projections like EPSG:3857 that are based on > a spherical projection of the Earth but is it the case for all > projections?
By "geographic CRS", I interpet that to mean one that is latitude and longitude. That is not really a "projection". Yes, EPSG:3857 has an incorrect spherical assumption, and I'd have to calculate, but I would not expect massive scale distortion, where massive is casually visually apparent. Perhaps Jorge can be precise about which CRS codes are in use.
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