As the French forces did not have the instrumentation or time to establish a sound geodetic base for these maps, they took the control points generated by the Director of the Observatory of Turin in the 1760s, Father Giovanni-Battista Beccaria (1716-1781), and built a triangulation scheme based on them. These points were further checked and corrected through the triangulation. The triangulation was executed by a geodetic expert, Michel Adrien Anne Lasseret (1778-1809) and later completed by Jean-Baptiste Coraboeuf (b. 1771, Retired 1837).