1. Observatoire de la Cte d'Azur CNRS Laboratoire Lagrange Universit Cte d'Azur Nice France
2. Now at Lunar and Planetary Laboratory University of Arizona Tucson AZ USA
3. Institute of Remote Sensing and Geographical Information System School of Earth and Space Sciences Peking University Beijing China
4. State Key Laboratory of Lunar and Planetary Sciences Macau University of Science and Technology Macau China