1. University of Cagliari, TeleGIS Laboratory, Department of Chemical and Geological Sciences, Cagliari, Italy
2. University Wollongong, School of Earth and Environmental Sciences, Wollongong, New South Wales, Australia
3. University of Cagliari, TeleGIS Laboratory, Department of Chemical and Geological Sciences, Cagliari, ItalycUniversity of Sassari, TeleGIS Laboratory, Desertification Research Center–NRD, Sassari, Italy