I. Introduction
Eutrophication is one of the most critical environmental problems currently affecting coastal areas and inland waters [1]. Chlorophyll-a (Chla), a pigment in phytoplankton, is used as a proxy for the trophic state [2]. Chla can be accurately obtained through traditional in-situ field measurement, but its labor and money-intensive nature make it difficult for routine, long-term, and large-scale trophic state monitoring [3]. In contrast, satellite remote sensing can address these limitations, given its rapid response, wide, long-term, and repetitive coverage, and relatively low cost [4]. However, unlike open oceans, where the optical properties are dominated by phytoplankton and their associated materials [5], turbid coastal and inland waters are jointly dominated by phytoplankton, suspended particulate matter (SPM), and colored dissolved organic matter (CDOM) [6].