The DTM (Digital Terrain Model), with national coverage, derives from the interpolation of the orographic data from the cartography of the Military Geographical Institute. The resulting product is a 20 m regular pitch matrix, the elements of which (pixels) report the values of the dimensions. The national territory is divided into units (tile) of dimensions 10Km x 10Km. The quotas are expressed in metres in the reference system msl (Mariographer of Genoa).
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