NEW PERSPECTIVES FOR MAPPING ALTERATIONS IN HBIM IN CONSERVATION PROJECTS

Historic Building Information Modelling (HBIM) finds one of its most interesting applications in conservation design. The HBIM approach did not originate as a simple data archive method but as an information tool to help the designer at all stages of the building process. Turning to the field of preservation, a lot of information about the building is represented by thematic maps. They make it possible to get a graphic representation of the state of conservation of a facade or to understand the structural situation of a building. This research, experimented on the Arch of Augustus in Aosta, starts from the large amount of data acquired by the RAVA Laboratory of the Superintendence of Aosta over a long period. These data allowed for testing different approaches to thematic mapping, depending on the specific themes to be represented. In any case, even this experimentation required theoretical reasoning that preceded the operational phases. The question, which this article wants only to start to address, concerns the role of thematic mappings in the preservation project carried out with an HBIM approach, their necessity, and their implementation towards truly threedimensional data, which therefore maintains all the information that is directly acquired in three dimensions.