Digital images for the knowledge of bell towers and their ornamental sign

The focus of the paper is the study of interwoven ornamental motifs found on complex architectures, such as bell towers. Specifically, it is highlight the mode of investigation performed through the use of UAVs. These tools are indispensable for an accurate knowledge of this architectural typology, which is characterized by a considerable height compared to the planimetric system. This is demonstrated in the digital survey of the bell tower of the Cathedral of Caserta Vecchia. The representations resulting from the flights allowed to carry out a stylistic and geometrical comparison of the ornamental elements, derived from Islamic and Byzantine contaminations, between this and the bell towers of Amalfi and Gaeta Cathedral. In particular, a geometric analysis of the systems of the tambour and of the intertwined arches has been carried out, action that provides a knowledge base for future strategies of valorization of the heritage, as well as for their cultural diffusion.