Cadastral Map Upgrading and Layers Harmonization for the Spatial Data Infrastructure in Friuli Venezia Giulia, Italy

The cadastral map represents an essential layer of any spatial data infrastructure, as well emphasized by the European directive INSPIRE. In this context, each cadastral parcel assumes a fundamental role, since it constitutes one of the key elements for carrying out an interoperable information system. The parcel represents the link among the legal domain information, the public restrictions, the private taxes, and further layers. The cadastral map, therefore, enlarges the required interoperable links to the complete available geo information tools like networks, plans, services and others. To fulfil this function, the cadastral map must satisfy a high level of accuracy, not reachable at the time of its implementation, often more than one century ago. Furthermore, the harmonization of a digital cadastral map into a spatial information system is complicated by further problems like fragmented reference systems, inaccurate upgrades, distorted and discontinuous representations. Accordingly, the cadastral map updating requires appropriate interventions. Sometimes the corrective actions prove to be empirical, not reproducible and of costly maintenance. Furthermore, the diversity of solutions hinders the database harmonization of the various administrations. This paper analyses the problems inherent in the Italian cadastral map, describes the methodology developed to update the digital map and recover the original geometric accuracy. Furthermore, the paper shows the results of a global and qualified set of interventions carried out by the Friuli Venezia Giulia regional administration, in cooperation with INSIEL Spa and the University of Udine, that make the cadastral data base fully harmonized and interoperable within the regional spatial data infrastructure

Il rilievo con strumentazione GPS e la ricomposizione della rete dei Punti Fiduciali della Regione Friuli Venezia Giulia

Within the Protocol Agreement signed in 2005 with the Cadastre Administration (Agenzia del Territorio), the Friuli Venezia Giulia Region arranged to survey 10% of the Fiducial Points (FP) placed in its land, and to locate the remaining FPs, linked by the cadastral surveys of the professionals, in analytical way. The surveys were performed by GPS receivers, integrated by classical survey methods where the set up of the GPS antenna on the FP was not possible, or the bad reception prevented the proper use of the satellite instrumentations. From the surveyed FPs (more than 3500) the coordinates of the remaining linked FPs distributed in the region were computed. The activity allowed to determine the cadastral point position in a reliable and steady manner, and to define their coordinates in Cadastral, Gauss-Boaga, and UTM-ETRS89 reference systems

La georeferenziazione delle mappe catastali della Regione Friuli Venezia Giulia nel sistema cartografico regionale

The paper illustrates the activity carried out by the Friuli Venezia Giulia Region to georeference the cadastral maps of its territory into the regional cartographic system. The chosen method estimates the transformation parameters for every single cadastral sheet map on the basis of couples of corresponding points with known coordinates in both cartographic systems, couples of corresponding points on boundaries of contiguous maps, and finally a set of fiducial points whose coordinates had been estimated within the regional fiducial network recomposition project