Abstract:

HongHu is the biggest lake in Hubei province.Its main function is water storage and adjustment,irrigation,fishing,shipping and tourism,and it belongs to shallow type lakes.Besides being timeconsuming and expensive,conventional methods of studying water quality (e.g.water sampling by boat) frequently fail to adequately represent heterogeneous and patchy areas.Remote sensing techniques,which have the inherent ability to provide spatial and temporal information about water,may be the only viable way to effectively monitor water quality in lakes.This paper discusses the feasibility analysis of retrieval Chlorophylla concentration in HongHu Lakes using MODIS Data from 2005-2010.The result indicates that the Chlorophylla concentration is the main factor of influencing NDVI changes when Chlorophylla concentration value is high.This study also gives difference reversion format by various seasons.All indicates the method using NDVI value to retrieval Chlorophylla concentration is corrected.Finally,the detail process and methods on the business were put forward