INVERSION OF CHLOROPHYLL-A CONCENTRATION BASED ON TM REMOTE SENSING IMAGE IN WULIANGSUHAI LAKE

In this paper，the correlation between band combinations of Landsat5 /TM image and chlorophyll-a concentration has been studied after the image pre-processing of the TM of 23rd July，2009，and the correlation was low． Then the Wuliangsuhai Lake was divided into two areas according to water conservancy conditions and own characteristics of the lake， and the correlation between ( TM1 + TM2 + TM4) /TM3 ＆ TM4 /TM3 and chlorophyll-a concentration was high． Finally， chlorophyll-a concentration of Wuliangsuhai Lake was inversed by low error model which was established by ( TM1 + TM2 + TM4) /TM3． The model could accurately estimate chlorophyll-a concentration of Wuliangsuhai Lake， and satisfy the requirement for a real-time and rapid monitoring of chlorophyll-a concentration． This research will provide theoretical basis to dynamic monitoring and early warning of“Huang tai”algal bloom．