On the Integration of Digital 2D and 3D Survey Models for the Geometrical Configuration and the Damage Assessment of a Medieval Building in Venice

摘要

Nowadays more and more innovative survey techniques allow gathering detailed information about historical buildings, their present conditions, the materials composing them and the structural problems mining their stability. Within this context, the integration of digital 2D and 3D survey models can provide a deeper insight on both the present geometrical configuration and the constructive phases, allowing, at the same time, a detailed damage assessment. More specifically, an overview of the complex geometries, the irregular cross-sections and vertical deviations of the buildings can be achieved by juxtaposing sections taken from the point cloud with orthophotos or images obtained through digital rectification. This method can also be used as a support to visual analyses such as stratigraphic or crack pattern surveys. The present paper discusses the advantages of integrating the modern survey techniques of laser scanning and photogrammetric models through photorealistic images and accurate measurements of the Venetian Byzantine church of Santa Fosca on Torcello Island. This building, indeed, lends itself well to the purpose of this work, due to its peculiar geometrical configuration, the numerous modifications occurred throughout the centuries and the current structural damages.