Hello, I am using QGIS version 3.12.1-București QGIS code revision121cc00ff00 on Windows 64 bit.
In the properties window for the project, Project > Project Properties > General > Measurements > Ellipsoid (for distance and are calculations), I set the value "WGS 84 (EPSG:7030)" Then I try to add geometry attributes to a line layer, as explained at page: https://docs.qgis.org/testing/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#id212 Vector > Geometry Tools > Add Geometry Attributes I set: calculate using Ellipsoidal It works fine: I get a new layer which includes an attribute "length" with the length of the lines (in meters). Now I want to repeat the computation of the length, but with reference to a different ellipsoid: In the properties window for the project, under Project > Project Properties > General > Measurements > Ellipsoid (for distance and are calculations), I set the value "Sphere GRS 1980 Mean Radius (ESRI:107047)" This time when I try to add geometry values to the original layer, in the same way as descirbed before, it looks to work fine, I get no error message and get a new "length" attribute, but its value is "null". If I set again a different ellispoid in Project > Project Properties > General > Measurement > Ellipsoid (for distance and are calculations), provided it is not a spherical one, it works fine again, with numerical value of distance computed instead of "null". So, my question is: how can I get QGIS to compute the length of the lines using the spherical ellipsoid? Thanks
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