摘要
不同水质的水体在遥感影像上有较明显的反映。通过分析 TM影像上不同水质水体的视反射率特征 ,发现 1 - 4波段的视反射率 (R1、R2、R3和 R4)对不同的水质比较敏感。利用 R2 /R1 >1可以区分出较高悬浮泥沙区域 ,R4/R3可以作为水体有机污染的指标。以黄河三角洲地区的小清河口为例 ,利用不同时相的 TM影像 ,对水污染的遥感提取进行了尝试 ,得到了小清河口的水污染分布。
It seems much difference on remote sensing images with different quality water. After analyzing the relative spectral reflectance of different quality water on TM images, we found that the relative spectral reflectance of band 1 to band 4 (R1, R2, R3 and R4) were sensitive to the different quality water. R2 will be greater than R1 (R2/R1>1) for high suspended sediment regions, in which, if the suspended sediment concentration is very high, R3 is greater than R2 (R3>R2), otherwise R3<R2. For contaminated water, the more serious the polluted water is, the higher value R4/R3 is. According to the water monitoring data from Environment Protect Bureau of Dongying City, the main pollutants of drainage system in Yellow River Delta are organic substances. So R4/R3 may be used as an important index of water organic pollution in the area. After numerous tries and comparisons, we found the average and standard deviation of R4/R3 may be used as a semi-quality index for water pollution classification. The mouth of Xiao-qing River was taken as an example to test the above rules and its water pollution distributions were got from TM images in different years. The regions with high suspended sediment and serious polluted water can be extracted from TM images using the method introduced above. And the method has some references for water monitoring with large area.
出处
《遥感技术与应用》
CSCD
2002年第2期74-77,共4页
Remote Sensing Technology and Application
关键词
水污染
遥感
监测
Xiao\|qing River, Water pollution, Relative spectral reflectance, Remote sensing
