ESTIMATION OF CHLOROPHYLL-a CONCENTRATION IN LAKE XINMIAO BASED ON A SEMI-ANALYTICAL MODEL

Remote sensing has many advantages to assess Chlorophyll-a(Chl-a) concentrations.By in situ spectral and matching Chl-a contents measurement from May to September of 2004 in lake Xinmiao,Jilin province, a three-band model was erected to optimize band combination for accurate Chla estimation.The model was based on the optical properties of Chl-a,suspended sediments,chromatic dissolved organic carbon and pure water.Strong linear relationship was established between analytically measured Chl-a concentrations and estimated values.The results show that the model has physical foundation and high precision with high determination coefficient 0.8758 and low root-mean-square error 4.98μg·L-1.The model has been proved to be a useful tool to assess Chl-a levels in inland waters.