I am trying to identify a coordinate system used to give positions to caves in France.

The Emergence du Ressel is at 555,19 - 251,48 (decimal coordinates 44.56194, 1.77167) and Source de Landenouse is at 562,54 - 243,17 (decimal coordinates 44.48763, 1.8657).

I am unable to identify the (xxx,yy - xxx,yy) coordinate system. How do I convert from that?

1 Answer 1


I could be wrong but I think they are in Lambert system. Check out this tutorial as it explains conversions and it deals with caves in france, so i would think its what you are looking for



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