应用TM图像评估洪涝灾情

1991年夏,我国东部广大地区发生特大洪涝灾害,本文报导应用TM图像评估滁河、水阳江流域洪涝灾情的试验研究结果,发展了一套从TM图像数值分析人手,把TM包含的有关地面水分与植被状况的丰富信息转化为洪涝灾情信息的图像应用处理技术。微机图像处理系统自动输出的灾情分布图经实地验证,准确可信。

ASSESSMENT OF FLOOD AND WATERLOGGING DAMAGE BY TM IMAGE

In the summer of 1991, the region of Yangtze and Huaihe river suffered a catastrophic flood disaster, TMimages provide rich information of flood scope, surface moisture and vegetation growing, on which crop harvest depends. Through numerical analysis and applied processing of TMimage acquired on July, 14, five days after flood peak, the components humidity(H) Greenness (G)and other now indices were obtained. After a new supervised classification a map with heavy, moderate, light degree of disaster, undamaged region and residential spots was achieved as well as each class area. checking in the field indicated that the result was accurate.