Helvetia-Italy Digital Elevation Model
In the last few years have been acquired in Italy and Switzerland, the land elevation data with  technologies and various inaccuracies.  The project aims at creating a digital terrain model (DTM) correctly  geo-referenced, multi-resolution, incorporating prior validation, all the information  available for the alpine and subalpine, including Italy (Piedmont, Lombardy) and Switzerland (cantons  Ticino, Graubünden and Valais).  Basic elements are the estimated parameters of the transformation between reference systems  national models in accordance with the accuracies of the original soil, the calculation of a model  Unique geoid also supported by data from European Space Agency's GOCE mission, the  testing of a cross-border service of satellite positioning (eg GPS) time  based on the actual number of existing networks of permanent stations.