1. a French Geological Survey (BRGM) , Development Planning and Natural Risks Division , 3 avenue C. Guillemin , 45060 Orléans cedex 2, BP 36009, France
2. b European Space Agency (ESA) , EO Science and Applications Department , D/EOP‐SEP Via Galileo , Galilei, Casella Postale 64, 00044 Frascati (RM), Italy