Survey and photogrammetry in underwater archaeological contexts at low visibility in the Venice lagoon

Underwater archaeological research, survey, and documentation are influenced by environmental conditions, in particular for the photographic aspects. The last challenge of underwater survey is application photogrammetric technique low visibility murky lagoon water with a strong current constant tide. These conditioning factors have determined employment digital technologies to obtain 3D model sites Venice Lagoon. In these extreme typical Lagoon, around 0,5/1 m, techniques permitted models submerged structures from Roman period, thanks meticulous planning work, an extensive acquisition, topographic survey.