The present work shows on the application of a terrestrial laser scanner (TLS) for the documentation of an interesting religious building preserved in the medieval archaeological site of Motta Sant’Agata, located in the hinterland of the Municipality of Reggio C., Italy. The survey project, part of the POR project “Circuito delle aree archeologiche urbane di Reggio Calabria”, has a twofold objective: 1. to create a 3D model with high resolution and metric accuracy for needs related to conservation, restoration and monitoring of degradation processes of the structures; 2. to develop digital products and media for dissemination and remote visit (via virtual tour and augmented reality).
Considering the size of the area (about 900 mq) and the architectural features of the ruins, made up by perimeter walls of 30 m x 10m preserved for over 2 m in elevation, 4 underground crypts and other annexed structures (e.g. bell tower), the use of the Faro Focus 3D S120 appeared the most suitable choice. It is a portable and versatile laser-scanner, based on phase-shift technology, which is mounted on a tripod and is equipped with a calibrated RGB camera with 70 megapixels. This device has allowed to capture the entire religious complex through 94 positions of scans distributed along the nave, inside the crypts and along the perimeter walls. The model resulting from the scan process have finally provided a 3D digital replica, from which qualitative and quantitative information useful can be extracted: geometric measures, plans at different altitude, transversal and longitudinal sections and wall elevations. A virtual tour was also generated using the 360° pictures captured during each scan. TLS have finally revealed useful for metric documentation, monitoring the conservation of the buildings, as basis for digital or physical restoration as well for their enhancement and dissemination.
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