Prof. Guo Huadong is the Director General and Professor at the Center for Earth Observation and Digital Earth, Chinese Academy of Sciences(CAS), He has been engaged in remote sensing research since 1977, devoting to research on radar remote sensing, development of new earth observing systems, and remote sensing applications. He was project leader of more than 10 key programs related to earth observation. For the past over 10 years and at present, he was and is one of the principal investigators for SIR-C/X-SAR, JERS-1 SAR, ERS-1/2 SAR, Radarsat-1/2, Envisat, SRTM, and ALOS programs. He is a member of International SAR Working Group, Chairman of the Associate on Environment Remote Sensing of China, Secretary General of International Society for Digital Earth, Editor-in-Chief of International Journal of Digital Earth, member of Codata executive committee, and guest professor of 7 Universities in China. He was the Principal Scientist of Expert Group for Information Acquisition and Processing Technology, National High-tech Research and Development Program in China from 1996 to 2000. He has published more than 200 papers and 15 books. He is the recipient of 3 national awards on science and technology, and 9 awards by the Chinese Academy of Sciences.