Inversion of total suspended matter concentration in Maowei Sea and its estuary, Southwest China using contemporaneous optical data and GF SAR data
DING Bo1,3(), LI Wei2(), HU Ke1
1. School of Ocean Sciences, China University of Geosciences (Beijing), Beijng 100083, China 2. Yantai Geological Survey Center of Coastal Zone, China Geological Survey, Yantai 264011, China 3. NewMark Technology (Beijing) Co., Ltd., Beijing 100085, China
Total suspended matter concentration (TSMC) is one of the important factors influencing water bodies in coastal gulfs and lagoons. The rapid and accurate TSMC inversion can be obtained using remote sensing data. However, it is scarce to conduct TSMC inversion using two different data sources at the same time. This study conducted the inversion of TSMC in Maowei Sea and its estuary based on two data sources. Specifically, this study carried out image segmentation and object extraction using the dual-band ratio algorithm and the Cloude-Pottier target decomposition algorithm, respectively based on GF-1C optical images and GF-3 SAR data of September 2019. Meanwhile, contemporaneous field sample data were utilized. Then, the TSMC inversion was performed using the cubic polynomial regression algorithm. As revealed by the accuracy analysis, the fitting degree (R2), root mean square error, and mean relative percentage error of the GF-1C-based inversion model were 0.88, 130.25 mg/L, and 9.65%, respectively, while those of the GF-3-based inversion model were 0.61, 230.87 mg/L, and 15.13%, respectively. These indicate that the GF-1C-based TSMC inversion had a higher inversion accuracy (90.35%) than the GF-3-based TSMC inversion (84.87%). However, the inversion results of the two models showed highly similar distribution patterns. This further indicates that the inversion models established using two different data sources in this study can serve as references for TSMC inversion of Maowei Sea and its estuary and for the environmental monitoring in coastal zones.
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DING Bo, LI Wei, HU Ke. Inversion of total suspended matter concentration in Maowei Sea and its estuary, Southwest China using contemporaneous optical data and GF SAR data. Remote Sensing for Natural Resources, 2022, 34(1): 10-17.
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