Is it possible to define ellipsoid (None/Planimetric) into QGIS environment, not only for Project environment?
I use calculations without ellipsoid, but sometimes I forget to make ellipsoid as None/Planimetric.
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The setting to use no ellipsoid for measurements isn't directly available as a global default setting for all projects. However, you can achieve the same effect by creating a template project with the desired settings (thanks to Gabriel de Luca for this method).
Open a new project. Set the measurement ellipsoid to none/planimetric in the Project Properties window.
In the Settings menu > Options | General window, choose "set current project as default" and "Create new project from default project.
Per another suggestion by Gabriel de Luca, you can also perform a planimetric area measurement in any project in the Field Calculator. Use the layer's projection and units, with the function
area( $geometry) instead of