Digitization and registration of Dufour plans

SPATIAL SA has developed a process to transfer the plans published by General Dufour, established in the 1850s, from a local system to the current Swiss national system, using an affine transformation with meshing and interpolation.

The process consists of:

1. digitize DUFOUR cardboard plans,
2. digitize plots and buildings,
3. identify the homologous points from planes to planes,
4. simulate the effect of an affine transformation, by providing the Land Registry with a “comb” of residual vectors [digitized points – transformed points],
5. apply the affine transformation validated by the Simulation Cadastre service.

This process was implemented for the company Haller Wasser + Partner SA, to process 2/3 of the Dufour plans of the Republic and the canton of Geneva.