Inversion of Chlorophyll-a Concentration in Shanghai Offshore Waters Based on BRDF Correction

HAN Zhen, CHEN Shuai-kang, LI Pi-xue, CHEN Hao-cheng

Journal of Changjiang River Scientific Research Institute ›› 2024, Vol. 41 ›› Issue (9) : 169-177.

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Journal of Changjiang River Scientific Research Institute ›› 2024, Vol. 41 ›› Issue (9) : 169-177. DOI: 10.11988/ckyyb.20230373
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Inversion of Chlorophyll-a Concentration in Shanghai Offshore Waters Based on BRDF Correction

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Abstract

To investigate the ecological status of Shanghai’s offshore waters, we applied the water color remote sensing technology to estimate chlorophyll-a concentration. Considering the impact of BRDF (Bidirectional Reflectance Distribution Function) on inversion accuracy, we utilized LandSat-8 remote sensing data and measured water quality data in association with Lee’s model and QAA (Quasi-analytical algorithm) for BRDF correction. Results indicate that suspended sediment concentration is a major factor affecting BRDF. The angle of sunlight has minimal impact on BRDF when the sun is not vertically incident. After BRDF correction, the mean value of R2 increased by 22.2% to 0.9, whereas mean RMSE decreased to 0.74. Before the correction, chlorophyll-a concentrations in Shanghai’s offshore waters were overestimated by an average of 2 mg/m3. BRDF correction notably enhances chlorophyll-a inversion accuracy, presenting innovative insights for offshore water color inversion.

Key words

chlorophyll-a / BRDF correction / offshore waters / Landsat-8

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HAN Zhen , CHEN Shuai-kang , LI Pi-xue , et al. Inversion of Chlorophyll-a Concentration in Shanghai Offshore Waters Based on BRDF Correction[J]. Journal of Yangtze River Scientific Research Institute. 2024, 41(9): 169-177 https://doi.org/10.11988/ckyyb.20230373

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本研究部分数据来源于上海市海洋环境监测预报中心,感谢上海市海洋环境监测预报中心提供的数据支持。

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