1. a Jacob Blaustein Institute for Desert Research , Ben-Gurion University of the Negev , Sede-Boker, Campus, 84990, Israel
2. b Department of Mathematics and Computer Science , Ben-Gurion University of the Negev , Beer-Sheva, 84105, Israel
3. c Laboratoire de Geologie-Geomorphologie Structurale et Teledetection , Universite Pierre et Marie Curie , Tour 26, 4 Place Jussieu, Paris, 75252, France