基于3S技术的北京野鸭湖湿地资源的动态变化研究

充分利用现有的遥感影像资料,选取合适的算法对不同传感器和不同时相的遥感图像进行融合,得到清晰且分辨率高的融合图像,利用地理信息系统软件叠置分析功能并结合影像特征分析和野外调查,消除由于不同时相融合带来的不利影响。有效地提取出野鸭湖湿地1998年、2000年和2002年的湿地面积,并对其空间变化进行了对比分析。研究结果表明:由于近几年的持续干旱,野鸭湖湿地面积和空间位置发生了较大的变化。

Research on Dynamic Change in Wetland Resource in Peking Widgeon-lake Based on 3S Techniques

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.