1. College of Surveying and Geo-Informatics, Tongji University, Shanghai 200092, China
2. School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia
3. CAS Key Laboratory of Microwave Remote Sensing, National Space Science Center, Chinese Academy of Sciences (CAS), Beijing 100190, China
4. European Organization for the Exploitation of Meteorological Satellites (EUMETSAT), Eumetsat Allee 1, 64295 Darmstadt, Germany