IL RILIEVO E LA DOCUMENTAZIONE SUBACQUEA IN AMBIENTE LAGUNARE

Underwater archaeological research, as well as the survey and documentation, is mainly influenced by the environmental conditions and the lagoon environment is extremely difficult due to the strong current, the constant tidal range and the low visibility of the water. The last challenge of the underwater survey is mainly linked to the application of the photogrammetric technique, supported by the more traditional techniques of topographic and instrumental survey. Digital techniques have made it possible to obtain accurate three-dimensional models of various submerged structures from the Roman era in the Venice lagoon, confirming how a combined survey approach offers the precious opportunity to visualise a submerged site in its entirety and therefore to study and understand the archaeological heritage. The synergistic use of the survey techniques also allows having precise metric documentation and digital models with accurate bathymetric data of archaeological evidence with a key role in the studies on eustasy and subsidence.