Thank you, Tim Keitt, Michael Sumner and J?rome Mathieu for your helpful
answers.
I can calculate the area with all of your suggestions (WGS 84 / UTM), I also
find the function
areaPolygon in the R package geosphere, proposed by J?rome, very
interesting,
it allows you to calculate the area (m2) without changing the projection
(WGS84).
thank you again
Best regards
Mahrez
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