Inversion of total suspended matter concentration in Maowei Sea and its estuary, Southwest China using contemporaneous optical data and GF SAR data
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摘要: 悬浮物是近海海湾及潟湖水质的重要影响因素之一。遥感技术能够准确快速地反演水体的悬浮物浓度,但鲜有同时利用2种不同类型的数据源反演同一研究区的悬浮物浓度。该文基于同一时期(2019年9月)的GF-1C光学影像和GF-3微波数据,采用双波段比值算法和Cloude-Pottier分解算法分别对原始影像进行图像分割和目标提取,并在此基础上,结合同期野外采样数据,利用三次多项式回归算法,开展了茅尾海及其入海口水体悬浮物反演。精度分析显示,GF-1C反演模型相关系数(R2)、均方根误差和平均相对误差分别为0.88,130.25 mg/L和9.65%; 而GF-3反演模型对应结果分别为0.61,230.87 mg/L和15.13%,研究表明,GF-1C光学遥感反演精度(90.35%)要好于GF-3微波遥感反演结果(84.87%),但2种反演结果分布具有较高的相似性和一致性,进一步表明基于2种不同数据源建立的反演模型能够为茅尾海悬浮物反演和海岸带环境监测提供参考。Abstract: 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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Key words:
- total suspended matter concentration (TSMC) /
- SAR image /
- optical image /
- remote sensing /
- Maowei Sea
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