IGNF register and shift grid NTF-RGF93
This page describes how to well use the projections defined by the french company IGN (en) (fr) in GRASS.
In fact the french compagny IGN manages the projections used in France and defined them by the IGNF register.
For the Linux user, once you have installed GRASS, you can find the IGNF on your computer
For the non Linux users, you can open this page and save it on your computer.
Tests :