1. a Remote Sensing and GIS Center , Sultan Qaboos University , PO Box 33, Al‐Khod PC 123, Oman
2. b Office of Earth Science Code YS , NASA Headquarters , 300 E St., SW Washington, DC 20546, USA
3. c The Woods Hole Research Center , 149 Woods Hole Road, Falmouth, MA 02540, USA
4. d Formerly Envisense Corporation , Ann Arbor, Michigan, USA