Tecniche innovative di rilievo e modellazione 3D per l'archeologia: ZScan e UAV per l'area di via degli Scavi a Montegrotto

Accessibility to cultural heritage is one of the most important factor in cultural heritage preservation, as it assure knowledge, monitoring, Public Administration management and a wide interest on cultural heritage sites. Now-days 3D surveys give the geometric basis for an effective artefact reconstruction but most of the times 3D data are not completely and deeply investigated to extract other useful information on historical monuments for their conservation, safeguard and valorization. A topographic survey has been done so to be able to control and relate all the different acquisitions. It has been chosen a Photo Scanner 3D system. It is a photogrammetry-based survey technology for point clouds acquisition and 3D models configuration, from digital images processing. This technology allows to obtain point clouds (xyz coordinates) with RGB information and geometries at different levels of complexity by processing a number of images taken with a limited set of constraints, with the use of a simple acquisition equipment and through an image matching algorithm (ZScan, by Menci Software). All the archaeological site has been surveyed with a remote controlled drone (UAV Unmanned Aerial Vehicle) with a digital camera on it, so to take pictures up to the maximum altitude and with different shooting angles ( 90 and 45 degree). This is a new technology which permits to survey very large area with ease and accuracy, by collecting redundant pictures later bound together by an image block algorithm. This paper aims to present the survey experience on via degli Scavi in Montegrotto Terme (PD) trough the application of a trifocal quick photogrammetric system, in surveying at different scales and for different purposes.