The BIM Model for Existing Building Heritage: From the Geometric Data Acquisition to the Information Management

The present work is part of a line of research that wants to define procedures for the digitization and management of the existing building her- itage; such procedures must be valid for both modern and historical construc- tions. This article aims to present the preliminary results of the studies conducted on an existing historical-cultural building, of which the digital model must be reconstructed. In detail, after a brief analysis of the complex, we focused on the acquiring and processing procedures of the necessary data for the reconstruction of the BIM model. The survey phase involved two different moments: the first one was characterized by the exploratory activities required for the second one, in which Lidar and UAV systems were used to fully define the geometry of a part of the complex. The study shows also some problems encountered during data processing and the related solutions found: these data, indeed, had to be manageable and functional for the reconstruction of a BIM model, which could be included in a tender notice.