There were extremely heavy flood disasters in the middle reaches of the Changjinang River and the Nenjiang-Songhuajiang regions in North-East China in summer 1998. In the continuous monitoring and assessment of these historical flood disasters the remote sensing techniques and Geographic Information System have played an important role. From June to September 1998, by using the remote sensing and GIS, the flood and the follding areas have been monitored and assessed. With the spaceborne and airborne remote sensing, the waterlogged areas caused by heary raining later July 1998 in Wuhan region, Hubei Province, the flooding areas in Hunan, Hubei and jiangxi Provinces of the middle raches of the Changjiang River, including the Dongting and Poyang Lake regions and in the Heilongjiang, Jilin Provinces and the Inner-Mongolia Autonomous Region have been estimated from the images by the flood information extraction. The objective and relative accurate data have been obtained and provided to the organs related to the disaster fighting. The practice of the flood monitoring by remote sensing and relevant information technologies has proved its important role. Meanwhile, in this paper some existed problems in the recent conditions have also been discussed.
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