Georeferenced vector-type database containing homogeneous groupings of data referring to the various types of land use 1976, scale 1:25,000. In this new version of the 1976 land use database, the legends of the various versions present have been homogenized and the database has also been reorganised, as far as possible, according to the directives of the European Corine Land Cover (CLC) project. The problems concerning the congruence of the attacks between the cards have also been resolved, present in about 80% of the cases with up to 100 errors on the tablet: when the homologous borders were moved between them, they were brought back, recomposing the polygons broken by the cut of the tablet. In the majority of cases, where there was no thematic correspondence between the adjacent polygons, the aerial photos were consulted and the conflict was resolved. The problems relating to the georeferencing of the IGM bases, on which the map was drawn, were then addressed; the IGM tablets present different classifications: Bessel for the oldest and Hayford for the most recent. The distribution of the two systems is varied within the regional territory, this means that the original boundary tablets between the two systems do not "touch" each other, physically missing portions of the mapped territory, sometimes causing deviations of more than 150 meters land, compared to 25,000 CTR. Through operations of movement and subsequent adaptation, the tablets have been arranged in the best possible way, bringing the maximum deviation, with respect to the regional topographic base, to around 30 meters on the ground. This new edition also includes the 7 new municipalities of Valmarecchia.
