I am using QGIS 3.4.1 on Windows 10. Project CRS is EPSG:3857 (WGS 84/Pseudo-Mercator).
I have defined a vector grid. Type is Rectangle (polygon). Horizontal and vertical distance is 50 m. Overlay is 0 m. GRID CRS is EPSG:3857. This goes well. But after selecting one of the polygons, the Cartesian properties are quite different from the Ellipsoid properties: - Cartesian: Outline: 200 m, Area 2500 m2 - Ellipsoid: Outline: 122,536, Area 938,435 m2 - Using the measurement tool shows sides of the rectangle of 30,567 m.
I expected a small difference between Cartesian and Ellipsoid outcomes, but this is impossible.
Does anybody have a clue of what is going wrong?