应用遥感资料获取库区水下地形的方法研究

Application of Remote Sensing Data to Extraction of Underwater Topography of Reservoir

对美国陆地卫星（Ｌａｎｄｓａｔ）接收到的新安江水库七个不同时相的多波段ＴＭ数据图像资料进行计算机解译，按不同的库区水位解译出每个时相的水陆界线准确位置及求出水边线所包围的水域面积，然后按序进行图形叠加，经过整饰便可得到一幅库区的水下地形图．根据卫星遥感的成像时间找出水库当时的实际水位，作出水库的水位面积曲线［１］．经新安江水库原设计的水位面积曲线与用遥感方法提取的同等水位的面积值分析计算，其平均误差小于０１１％，这对于复核水库库容具有重要的现实意义．

This report explains Landsat TM data of seven different time phases and the exact water level is interpreted by computer to obtain the water surface area and the exact water land boundary for each time phase Then,the images are superposed and the underwater topographic map of the reservoir,is obtained According to the imaging time of landsat TM and corresponding actual water level of the reservoir,the water level area curve is plotted by use of computer A comparison of the original design data with the remote sensing data for the same water level indicates that the average error is smaller than 0 11%;this is of practical significance to the checkup of the reservoir storage