The Microphotogrammetry as a Portable Diagnostic Tool for Monumental Surface Monitoring

The digital microphotogrammetry is a further development of the common image-based 3D rendering technology currently in use in the field of the conservation and documentation of monumental buildings, architectural surfaces, historical objects and archaeological sites. The great effort in improving the matching and post processing software, made by Menci company, for image matching of the same area taken at different time, allows the use of this methodology for on site monitoring campaigns. The new methodology has been tested in laboratory investigations and experiments and its sensitivity and reliability as measuring tool for qualify the "surface pattern" (colour and geometry) of an historic asset has been verified. The system has been validated on two marble statues located in front of the Palazzo Vecchio in Florence: a copy of the Michelangelo’s David , exposed since 1910, and the group of Ercole and Caco of Baccio Bandinelli, exposed since 1534.