Documentazione e ricostruzione 3D di un menhir inedito rinvenuto in località “Sa Perda Fitta”, Sant’Anna Arresi (Sardegna sud-occidentale)

The authors illustrate the documentation process of a menhir not recorded in earlier studies, which was fortuitously discovered in Sa Perda Fitta, in the western landscape of Sant’Anna Arresi, a small municipality of Sulcis (south-western Sardinia). This area was the subject of a detailed study by the Authors for their PhD dissertation at the Universidad de Granada, whose purpose was the detection and analysis of settlement patterns of human communities from the Neolithic to the Bronze Age. This territory, bounded on the East by the Sulcis massif and on the West by the Gulf of Palmas, is characterized by the presence of coastal ponds which have fostered the presence and the settlement of human groups since the Neolithic. The place name Sa Perda Fitta (in the Sardinian language ‘stone fixed into the ground’) has aroused a great deal of interest as it suggests the presence of at least one menhir, a widespread prehistoric monument on the island from the Neolithic to the Chalcolithic age. Morphology and typology of the monument was examined and a 3D model created by the photogrammetric processing of a digital photo dataset using Agisoft Photoscan 3D Pro, an automatic 3D reconstruction Structure from Motion (SfM) based software offering a significant and innovative contribution to the recording and dissemination of archaeological data.