Ruined Archeological Heritage: Survey, 3D Modeling, Virtual Anastylosis.

The study focuses on the use of 3D surveying and digital representation tools for the purpose of documenting archaeological monuments whose restoration involves the disassembly and repositioning of blocks. The case study in question is a building at the west end of the San Biagio archaic sanctuary, located within the archaeological site of Agrigento. The monument is a rectangular building encompassing two pools, whose foundations are suffering from deep decay and there are large spaces between the walls which have become disconnected. Surveying and 3D modelling have been used to illustrate the existing state of the building. Plans, sections and orthophotos have been created to support the indexing of ashlars and to evaluate the structural decay. A 3D model of the most dilapidated part of the building, the north-eastern corner, has been constructed in order to document the direction of the ashlars and where they are positioned in relation to each other. Finally, a restoration model of this building has been built