1. a The Remote Sensing Laboratory, Department of Environmental Physics, J. Blaustein Institute for Desert Research , Ben Gurion University of the Negev , Sede Boker Campus, 84990 , Israel
2. b The Wyler Laboratory for Arid Land Conservation and Development, Department of Dryland Agriculture, J. Blaustein Institute for Desert Research , Ben Gurion University of the Negev , Sede Boker Campus, 84990 , Israel