Research on Suspended Matter Concentration Retrieval of SDGSAT-1 Satellite in Lake Taihu Based on Hydrolight Model

浓度/（g/m³）	敏感因子	相关性			浓度/（g/m³）	敏感因子	相关性
浓度/（g/m³）	敏感因子	悬浮物	叶绿素a	CDOM	浓度/（g/m³）	敏感因子	悬浮物	叶绿素a	CDOM
注：**表示在0.01级别（双尾）相关性显著。
[15~48]	$ R'({B_3}/{B_5}) $	–0.760^**	0.017	–0.367	[15~145]	$ R'({B_5}/{B_2}) $	0.737^**	–0.043	0.101
	$ R'({B_4}/{B_5}) $	–0.674^**	0.292	–0.139		$ R'({B_5}/{B_3}) $	0.766^**	0.003	0.069
	$ R'({B_5}/{B_2}) $	0.702^**	–0.147	0.365		$ R'({B_5}/{B_4}) $	0.729^**	–0.102	–0.032
	$ R'({B_5}/{B_3}) $	0.769^**	–0.081	0.323		$ R'({B_5} - {B_2}) $	0.715^**	–0.114	–0.038
	$ R'({B_5}/{B_4}) $	0.677^**	–0.313	0.104		$ R'({B_5} - {B_3}) $	0.745^**	–0.026	0.037
	$ R'({B_2} - {B_5}) $	–0.683^**	0.269	–0.129		$ R'({B_5} - {B_4}) $	0.711^**	0.056	0.244
	$ R'({B_3} - {B_5}) $	–0.764^**	0.035	–0.322		$ R'({B_2}/{B_5}) $	–0.704^**	0.0003	–0.149
	$ R'({B_5} - {B_2}) $	0.683^**	0.269	0.129		$ R'({B_3}/{B_5}) $	–0.731^**	–0.049	–0.115
	$ R'({B_5} - {B_3}) $	0.764^**	0.035	0.322		$ R'({B_4}/{B_5}) $	–0.709^**	0.079	0.010
(48~80]	$ R'({B_3}/{B_5}) $	–0.652^**	0.330	0.258		$ R'({B_2} - {B_5}) $	–0.715^**	0.114	0.038
(48~80]	$ R'({B_5}/{B_3}) $	0.707^**	–0.096	–0.029		$ R'({B_3} - {B_5}) $	–0.745^**	0.026	–0.037
（80~145]	$ R'({B_3}/{B_5}) $	0.664^**	0.181	–0.182		$ R'({B_4} - {B_5}) $	–0.711^**	–0.056	–0.244
（80~145]	$ R'({B_5}/{B_3}) $	–0.702^**	–0.073	0.089		$ R'({B_4} - {B_5}) $	–0.711^**	–0.056	–0.244

Table 2. Comparison of different suspended matter concentration retrieval models constructed with \begin{document}$ R'({B_{\text{5}}}{\text{/}}{B_{\text{3}}}) $\end{document} as the retrieval factor

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Table 2. Comparison of different suspended matter concentration retrieval models constructed with \begin{document}$ R'({B_{\text{5}}}{\text{/}}{B_{\text{3}}}) $\end{document} as the retrieval factor

模型名称	模型表达式	决定系数R²	E_RMS/（g/m³）	E_MAP/%	E_NRMS/%
指数模型	ρ_tsm=3.0564e^2.3725x	0.796	13.01	19.63	23.62
线性模型	ρ_tsm=122.19x–86.503	0.779	13.35	22.68	28.64
对数模型	ρ_tsm=134.61ln x+37.467	0.751	14.44	26.36	35.10
二次模型	ρ_tsm=97.614x²–105.035x+41.455	0.795	11.50	18.14	22.21
幂函数模型	ρ_tsm=32.626x^2.6801	0.817	9.89	13.39	18.97

Table 3. Error statistics in different concentration intervals
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Table 3. Error statistics in different concentration intervals
浓度区间/（g/m³）样点个数 E_RMS/（g/m³） E_MAP/% E_NRMS/%
[15, 48] 26 9.01 16.38 15.18
(48, 80] 20 10.50 10.39 16.49
(80, 145] 8 18.17 25.90 20.82
[15, 145] 54 13.70 18.47 20.83

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Yaping WANG, Xueke HU, Jiaguo LI, Sheng JIANG, Xingfeng CHEN, Limin ZHAO, Hongzhen CHEN. Research on Suspended Matter Concentration Retrieval of SDGSAT-1 Satellite in Lake Taihu Based on Hydrolight Model[J]. Spacecraft Recovery & Remote Sensing, 2024, 45(1): 174

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