A VULNERABILITY-ORIENTED 3D GEODATABASE SUPPORTING SEISMIC PREVENTION IN HISTORICAL CENTRES

Historic urban centres are particularly vulnerable to seismic risk because of their complexity and fragility. Their safety affects entire communities, and their preservation as cultural assets is in charge and under interest of policies at various levels, from local to international. For this reason, a geographical multi-scale point of view for the analyses is increasingly favoured in the perspective of the scientific literature and, specifically, in Italian regulation policies. In this sense, advanced geomatics techniques can help to provide tools supporting data collection and storage, multi-scale seismic vulnerability assessment, and decision-making, especially in emergency situations and in places particularly affected by natural disasters. The proposed approach aims to implement a multiscale 3D geodatabase to support conservation strategies and risk assessment scenarios by developing a vulnerability-oriented GIS/HBIM integration in an urban 3D geodatabase, based on multiscale data derived from urban cartography and 3D mapping. To achieve that, geometric and semantic information on historic buildings and structural data were integrated for seismic vulnerability assessment, focusing on churches as particularly widespread and vulnerable assets. Special attention was paid to harmonizing the work with Italian legislation and the INSPIRE-based semantic (the Directive for Infrastructure for spatial information in Europe), so that the database can be as useful to seismic assessment as possible and at the same time the most shareable. In this framework, the area of study is connected to the territories affected by the 2016 earthquake in the centre of Italy. Particularly, the historical urban centre of Norcia and Campi di Norcia hamlet, with the church of Sant’Andrea in Campi di Norcia are the two cases connected with the double scale analysis, which are the urban and the architectural ones. The research is aimed at creating a user-oriented webGIS solution enriched by the object-based 3D GIS data and HBIM models, for the purposes of public sharing and use that will help all risk-related users as experts involved in emergency rescue activities and in cultural heritage preservation, for preventive seismic risk assessment and planning of restoration projects by predicting future scenarios.