An improved algorithm for estimating the Secchi disk depth of inland waters across China based on Sentinel-2 MSI data

Qin, Zihong; Wen, Youyue; Jiang, Jiegui; Sun, Qiang

doi:10.1007/s11356-023-25159-6

Cited by 8 publications

(1 citation statement)

References 70 publications

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“…The Secchi disk depth (Z sd ) is still the simplest measure, and at the same time, the most typical method to quantify water transparency in lakes and inland waters (Swift et al, 2006;McCullough et al, 2012;Ren et al, 2018;Qin et al, 2023) as well as coasts (Kataržytė et al, 2019) and offshore areas (Kabiri, 2022a).…”

Section: Introductionmentioning

confidence: 99%

Retrieval and Validation of the Secchi Disk Depth Values (Zsd) from the Sentinel-3 satellite data in the Persian Gulf and the Gulf of Oman

Kabiri

2023

Preprint

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In this study, the Secchi disk depth (Zsd) values as an indicator of seawater clarity/transparency were estimated using the ESA (European Space Agency) Sentinel-3A and − 3A OLCI (S3/OLCI) satellite data in the Persian Gulf and the Gulf of Oman (PG&GO). To do so, two procedures were evaluated including an empirical methodology developed by Doron et al., 2007 and 2011 and a novel model proposed in this research formed by employing the blue (B4) and green (B6) bands of S3/OLCI data. In this regard, a total number of 157 field-measured Zsd values (114 training points for calibration of the models and 43 control points for accuracy assessment of them) were observed during eight research cruises conducted by the research vessel, the Persian Gulf Explorer, in the PG&OS between 2018 and 2022. The optimum methodology was then selected based on the statistical indicators including, R2 (coefficient of determination), RMSE (root mean square error), and MAPE (mean absolute percentage error). However, after the indication of the optimal model, the data of all 157 observations were utilized for the calculation of unknown parameters of the model. The final results demonstrated that compared to the existing empirical model proposed by Doron et al., 2007 and 2011, the developed model in this study which was formed based on the linear and ratio terms of B4 and B6 bands, has more efficiency in the PG&GO. Consequently, a model in form of Zsd= e1.638B4/B6 − 8.241B4 − 12.876B6 + 1.26 was suggested for the estimation of Zsd values from S3/OLCI in the PG&GO (R2 = 0.749, RMSE = 2.56 m, and MAPE = 22.47%). The results also showed that the annual oscillation of the Zsd values in the GO (5–18 m) is evidently higher compared with those in the PG (4–12 m) and the SH (7–10 m) regions.

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Section: Introductionmentioning

confidence: 99%

Retrieval and Validation of the Secchi Disk Depth Values (Zsd) from the Sentinel-3 satellite data in the Persian Gulf and the Gulf of Oman

Kabiri

2023

Preprint

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show abstract

Retrieval and validation of the Secchi disk depth values (Zsd) from the Sentinel-3/OLCI satellite data in the Persian Gulf and the Gulf of Oman

Kabiri

2023

Environ Sci Pollut Res

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Long-term remote observations of particulate organic phosphorus concentration in eutrophic Lake Taihu based on a novel algorithm

et al. 2023

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An improved algorithm for estimating the Secchi disk depth of inland waters across China based on Sentinel-2 MSI data

Cited by 8 publications

References 70 publications

Retrieval and Validation of the Secchi Disk Depth Values (Zsd) from the Sentinel-3 satellite data in the Persian Gulf and the Gulf of Oman

Retrieval and Validation of the Secchi Disk Depth Values (Zsd) from the Sentinel-3 satellite data in the Persian Gulf and the Gulf of Oman

Retrieval and validation of the Secchi disk depth values (Zsd) from the Sentinel-3/OLCI satellite data in the Persian Gulf and the Gulf of Oman

Long-term remote observations of particulate organic phosphorus concentration in eutrophic Lake Taihu based on a novel algorithm

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