A study of remote sensing investigation for water quality pollution of the Fuxian and Xingyun Lakes in Yunnan Province using MODIS data

Remote sensing monitoring of water quality is capable of showing the distribution and variation of water quality in space and time and meets the demand of large-scale and real-time water quality assessment.In this paper,the spectral characteristics of Fuxian and Xingyun Lakes water are studied by analyzing the field spectra measurements.The observed of Chlorophyll-a(Chl-a) concentration,Suspended Sediment(SS) concentration and MODIS band combination were compared.The results show that the ratio of band 2 to band 1(r2/r1) with 250 m resolution is suitable to retrieve Chl-a concentration,while the proportion of sum-difference band 4 to band 3(r4-r3)/(r4+r3) with 500 m resolution is related closely to SS concentration.Utilizing the best band combinations,semi-empirical retrieval models for Chl-a,the SS concentrations are composed in the Fuxian and Xingyun Lakes.