【摘要】 本文基于MODIS卫星影像探讨太湖蓝藻水华的识别、监测问题.通过比较MODIS影像上不同蓝藻浓度的波段反射率值的差别,得到对蓝藻信息响应的敏感波段,利用特定波段的合成,可基本识别蓝藻的分布信息,并基于蓝藻的光谱响应特征,采用比值模型方法、进一步确定蓝藻分布的相对浓度信息.最后通过不同时相蓝藻浓度的叠加分析,得出了蓝藻水华的动态变化信息.更多还原

【Abstract】 This paper discusses the method and mechanism of identifying and monitoring the cyanobacteria bloom based on MODIS data in Lake Taihu.Through the comparison of spectral reflectance value of different cyanobacteria concentration,it can be found that several wave bands are sensitive to cyanobacteria.Making use of the color composition,we can get the macroscopic distribution information of the cyanobacteria bloom.Furthermore,using the ratio index model,we can further confine the relative content of the cyanobacteria bloom.Finally through overlaying analysis of the cyanobacteria concentration distribution from multi-temporal MODIS data,dynamic changing information of cyanobacteria bloom can he obtained.更多还原