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Remote Sensing for Natural Resources    2022, Vol. 34 Issue (1) : 10-17     DOI: 10.6046/zrzyyg.2021094
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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
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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.

Keywords total suspended matter concentration (TSMC)      SAR image      optical image      remote sensing      Maowei Sea     
ZTFLH:  TP79  
Corresponding Authors: LI Wei     E-mail: ding_boo@126.com;670095930@qq.com
Issue Date: 14 March 2022
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Bo DING
Wei LI
Ke HU
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Bo DING,Wei LI,Ke HU. Inversion of total suspended matter concentration in Maowei Sea and its estuary, Southwest China using contemporaneous optical data and GF SAR data[J]. Remote Sensing for Natural Resources, 2022, 34(1): 10-17.
URL:  
https://www.gtzyyg.com/EN/10.6046/zrzyyg.2021094     OR     https://www.gtzyyg.com/EN/Y2022/V34/I1/10
Fig.1  Map of the study area and sampling sites
取样
编号
悬浮物浓度/(mg·L-1) 取样
日期
平均潮
高/cm
0.5 m深度 5 m深度 10 m深度
1 1 527 822 1 120 2019-09-18 324
2 1 038 1 276 1 201
3 924 1 262 1 020
4 1 030 1 064 989
5 892 1 180 1 104 2019-09-19 345
6 1 124 995 1 418
7 1 216 1 230 962
8 1 036 1 213 1 064
9 1 074 1 464 948
10 1 248 1 394 1 174
11 1 090 1 177 872 2019-09-20 367
12 1 120 1 226 1 186
13 1 149 1 374 1 281
14 1 352 964 1 053
15 1 103 1 204 1 204
Tab.1  In situ data of total suspended matter concentration in Maowei Sea
数据
类型
传感
分辨
率/m
时相 参数
光学 GF-1C 8 2019-9-26
11: 44: 59 am
多光谱波段 增益 偏差
蓝光波段 0.029 0 0
绿光波段 0.038 2 0
红光波段 0.042 1 0
近红外波段 0.036 4 0
SAR GF-3 8 2019-9-4
11: 01: 40 am
C波段: (VH,VV)
分辨率: 4.5m×4.8m;
入射角: 42.787 378°~
47.954 950°
Tab.2  Details of remote sensing images used in study area
Fig.2  Relationship between TSMC and spectral reflectance
Fig.3  Regression relationships of measured TSMC and equivalent remote sensing reflectance
反演模型 验证点
数/个
Δrmse/
(mg·L-1)
相对误差/%
最大值 最小值 Δmrpe
GF-1C 8 130.25 17.70 2.15 9.65
GF-3 7 230.87 34.14 5.57 15.13
Tab.3  Validations of two regreesion models
Fig.4  Distributions of retrieved TSMC based on different remote sensing images
Fig.5  Comparisons of retrieved TSMCs and in situ measurements
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