Due to the importance of the agriculture in Europe the European Union (EU) created the CAP (Common Agricultural Policy), system of agricultural subsidies and programs. In 1992 a reform to the CAP introduced a direct area-based subsidies for farmers, part of the CAP Integrated Administration and Control System (IACS) , required the Member States to set up a Land Parcel Identification System (LPIS) based on land registry, maps, cartographic references, aerial or satellite imagery, mainly used for area bases subsidies and crosschecking of the farm declarations. The geographic information system (GIS) and the LPIS tools just achieve that. Therefore the use of alphanumerical and geographic data made compulsory the use of GIS.