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基于三波段生物光學模型反演閩江下游葉綠素a

Retrieval of Chlorophyll-a in Lower Reaches of the Minjiang River Via Three-Band Bio-Optical Model

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摘要

葉綠素a可直觀反映水體的營養化程度,三波段生物光學模型能削弱二類水體中懸浮物與黃色物質等因素的影響,準確估算葉綠素a的濃度。選用三波段因子法,分析實測水體光譜特征,確定三波段因子的大致位置,并通過窮舉法和相關性分析,確定三個特征波段建立反演模型。結果表明,當λ1=661.63 nm、λ2=693.54 nm、λ3=757.35 nm時,三波段因子[ Rrs-1(λ1)- Rrs-1(λ2)]Rrs(λ3)與葉綠素a濃度具有較高的相關系數(r=0.830)。該模型的決定系數、均方根誤差和平均絕對誤差百分比分別為0.859、2.446 mg·m -3和32.169%,其反演精度優于波段比值模型和反射峰模型。為閩江下游葉綠素a反演提供一定的理論依據和技術支持,也為以后使用三波段因子法反演二類水體的葉綠素a濃度提供波段選擇。

Abstract

Chlorophyll-a (Chla) can intuitively reflect the degree of eutrophication of water, Chla concentration can be accurately estimated via the three-band bio-optical model because it can weaken the influence of factors such as suspended and yellow matter in case-II waters. Therefore, the approximate position of the three-band factor was determined by analyzing the spectral characteristics of the measured water body. Further, three characteristic bands and a retrieval model were established using the exhaustive method and correlation analysis. Results show that when λ1=661.63 nm, λ2=693.54 nm, and λ3=757.35 nm, the three-band factor [ Rrs-1(λ1)- Rrs-1(λ2)]Rrs(λ3) exhibits a high correlation coefficient with the Chla concentration (r=0.830). The determination coefficient, root mean square error, and mean absolute percentage error of the model are 0.859, 2.446 mg·m -3, and 32.169%, respectively, furthermore, the accuracy is better than that of the band ratio and reflection peak models. These results can provide a theoretical basis and technical support for the Chla retrieval in the lower reaches of the Minjiang River and enable band selection for the subsequent retrieval of the Chla concentration in case-II waters using the three-band factor method.

Newport宣傳-MKS新實驗室計劃
補充資料

中圖分類號:TP79

DOI:10.3788/LOP57.071701

所屬欄目:醫用光學與生物技術

基金項目:中央引導地方科技發展專項、國家自然科學基金青年科學基金、福建省自然科學基金面上項目、中國博士后科學基金面上項目;

收稿日期:2019-10-29

修改稿日期:2019-11-06

網絡出版日期:2020-04-01

作者單位    點擊查看

謝婷婷:福州大學衛星空間信息技術綜合應用國家地方聯合工程研究中心, 福建 福州 350116空間數據挖掘與信息共享教育部重點實驗室, 福建 福州 350116
陳蕓芝:福州大學衛星空間信息技術綜合應用國家地方聯合工程研究中心, 福建 福州 350116空間數據挖掘與信息共享教育部重點實驗室, 福建 福州 350116
盧文芳:福州大學衛星空間信息技術綜合應用國家地方聯合工程研究中心, 福建 福州 350116空間數據挖掘與信息共享教育部重點實驗室, 福建 福州 350116

聯系人作者:陳蕓芝([email protected])

備注:中央引導地方科技發展專項、國家自然科學基金青年科學基金、福建省自然科學基金面上項目、中國博士后科學基金面上項目;

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引用該論文

Xie Tingting,Chen Yunzhi,Lu Wenfang. Retrieval of Chlorophyll-a in Lower Reaches of the Minjiang River Via Three-Band Bio-Optical Model[J]. Laser & Optoelectronics Progress, 2020, 57(7): 071701

謝婷婷,陳蕓芝,盧文芳. 基于三波段生物光學模型反演閩江下游葉綠素a[J]. 激光與光電子學進展, 2020, 57(7): 071701

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