The class “Level Curve”, belongs to the theme “Altimetry”, of the “Orography” Layer, of the Regional Geotopographic Database (code 050101 — CV_LIV), scale 1:5000, v. 2014. A descriptive element of the altimetry of the territory, traced by photogrammetric return or, more modernly, as an interpolation by the DTM. They must be traced throughout the map area with the sole exception of areas with an average gradient of less than or equal to 2 %.
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