1. North Dakota State University; Fargo; ND; U.S.A.
2. COMSATS Institute of Information Technology; Islamabad; Pakistan
3. Cracow University of Technology; Cracow; Poland
4. Center for Earth Observation and Digital Earth; Chinese Academy of Sciences; Beijing; China
5. University of the District of Columbia; Washington DC; U.S.A.
6. China University of Geosciences; Wuhan; China