8. How to find out the value of g in France

Depending on the absolute precision required for the value of g at a given point on the national territory, we can operate in various ways.

If the accuracy required is of the order of 10 ^–3 m/s ² , we can proceed by using a theoretical formula based on a given ellipsoid and correcting for the altitude of the measurement point. This is the method used in the Afnor NF X02-011 standard.

For a more precise measurement at 10 ^–4 m/s ² , or even better, we can perform a calculation based on the measurement stations in the vicinity of the point where we want to know the g value.

BRGM will shortly be putting a utility on its website to obtain...