Evaluation of SDGSAT-1 MII data in total suspended matter estimation in clear to extremely turbid rivers
Year: 2024
Type: article
Abstract: The Multispectral Imager (MII) onboard the newly launched SDGSAT-1 holds significant promise for monitoring and understanding variations in water quality within nearshore water systems, with an impressive spatial resolution of 10 m, seven spectral bands in the visible and near-infrared domain and a wide swath of 300 km. This paper evaluates the MII data in estimating the concentration of total suspended matter (TSM) in rivers and estuaries from clear to extremely turbid conditions. For atmospheric correction, the ACOLITE model showed superior performance compared to the FLAASH and 6SV, with average unbiased relative error (AURE) ranging from 11.8% to 26.4% in the four visible bands of MII. Through comparison, a TSM model based on the visible band ratio (i.e., Rrs(660)/Rrs(560)) was proposed to ensure the application of MII data in both clear and turbid waters, with an overall AURE of 40.9%. The model was then applied to map the TSM variations in the Hai and Liao Rivers in northern China using the MII data, where reliable spatial and temporal patterns were observed. The study concludes by discussing the applicability of MII data in water quality mapping in nearshore waters, along with key considerations such as model applicability, atmospheric correction, and land adjacency.
Authors: Shenglei Wang, Zichen Mao, Bing Zhang, Xiaolong Yu, Fenqi Zhao, Xiaofei Song, Changyong Dou, Fangfang Zhang, Junsheng Li
Institutions: Chinese Academy of Sciences, Aerospace Information Research Institute, International Research Center of Big Data for Sustainable Development Goals, University of Chinese Academy of Sciences, Xiamen University, State Key Laboratory of Marine Environmental Science, China University of Mining and Technology, China University of Geosciences, China University of Geosciences (Beijing)
Language: English
Topic: Coastal and Marine Dynamics
Subfield: Earth-Surface Processes
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,390
OpenAlex ID: W4404120043