Abstract
Taking full advantage of existing remote sensing images, and fusing remote images with different sensor and different time by selecting appropriate algorithm, a clear-cut and abundant-colored image is made. Then we eliminate adverse infection due to fuse different time images through GIS's overlay function combining with image's color and field investigation. So the monitoring and analysis on the dynamic change of wetland resource in Peking Widgeon-lake from 1998 to 2000 and to 2002 were made. The result showed that: in recently years, the biggish changing in the area and special position of Widgeon-lake can be due to the durative drought and the influence of human activity. The decrease in the area of water and paddy field are always accompanied by the increase in swamp meadow and dyke. The water area and the paddy field area have decreased 16.12% and 4.85% respectively from 1998 to 2000, 44.2% and 64.87% from 2000 to 2002. At the same time, swamp meadow and dyke have increased 52.56% and 20.16% respectively from 1998 to 2000,34.09% and 551.34% from 2000 to 2002.
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