Historical data of laser scanning and photogrammetry for the knowledge and memory plan of Cultural Heritage

Abstract – Cultural Heritage studies often require to perform analyses on buildings which have undergone several changes and alterations during their lifetime. This often implies loss of architectural elements or construction of new elements, in turn disrupting the perception of the former buildings. The recovery of lost elements or structures through virtual reconstructions is of paramount importance in both scientific and cultural applications. In this case, novel procedures in surveying and photogrammetric processing offer a powerful tool, allowing to extract geometric information from historical documentation such as archive images, historical photogrammetry (HP) or historical terrestrial laser scanner (HTLS). This contribution presents a methodology based on HTLS and HP data and aimed at the generation of 3-D models for multi-temporal geometric analysis of modified objects. The methodology was applied to two case studies: a portion of the Pisa medieval walls of and in the Fortezza Vecchia site in Livorno.