Integrated Digital Survey Techniques for the Documentation of the Artistic Heritage of the Franciscan Observance: the Pictorial Cycle of the Indulgence of Porziuncola by Tiberio d’Assisi

The European project ‘F-ATLAS – Franciscan Landscapes: Observance between Italy, Por- tugal and Spain’ aims to develop methodologies for managing cultural heritage in the digital era. This paper focuses on the documentation and analysis of frescoes depicting the indul- gence of Porziuncola by Tiberio d’Assisi in two locations: the Chapel of Roses in the Con- vent of San Fortunato in Montefalco (Perugia) and the Basilica di Santa Maria degli Angeli (Assisi). Integrated digital survey techniques, including laser scanning and photogrammetry, were employed to acquire metric, morphological, chromatic, and material data. This data permitted the creation of accurate digital reconstructions, enabling qualitative and quan- titative analysis of the frescoes. The project highlights similarities and differences in their execution and composition, shedding light on Tiberio d’Assisi's artistic process. This paper underscores the importance of integrating advanced technologies to understand historical artworks' creation and conservation methods.