How to define the Bertin 1953 projection in QGIS 3.18.2? I tried to define a custom projection by setting the following: enter image description here

This seems to be valid, but when I press the OK-Button, I get this mysterious error-message: enter image description here

I am using QGIS 3.18.2 on Windows: enter image description here

1 Answer 1


The error seems not to be related the Bertin 1953 projection. It seems it is caused by the first projection you defined earlier. Delete the first projection in the list (maybe the second also).


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