UAV AND CLOSE-RANGE PHOTOGRAMMETRY TO SUPPORT GEO-MECHANICAL ANALYSIS IN SAFETY ROAD MANAGEMENT: THE "VALLONE D'ELVA" ROAD. - Pontoglio, E.; Colucci, E.; Lingua, A.; Maschio, P.; Migliazza, M. R.; Scavia, C. (International Archives of the Photogrammetry, Remote Sensing & Spatial Information Sciences, 2020)