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Hyperspectral retrieval model of phycocyanin in case ii waters

Science Bulletin 2006年第S2期 149-153页

作者： YANG Dingtian1 & PAN Delu2 1.LED,South China Sea Institute of Oceanography,Guangzhou 510301,China 2.State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,SOA,Hangzhou 310012,China

Phycocyanin, a functional protein found in blue-green algae, with characteristic absorption peak around 620 nm, can be used to detect the quantity of blue-green algae in waters. Spectral characteristics of phycocyanin were studied by measuring hyperspectral water leaving radiance and absorption curve, and the results showed that the absorption peak of phycocyanin around 620 nm was evident in the curve of water leaving radiance. Bio-optical model of phycocyanin was set up with analytical methods and calibrated with error analysis. Linear relationship between phycocyanin concentration measured and that retrieved with calibrated bio-optical model (R = 0.755) was better than that retrieved with the band ratio of 709 nm/620 nm (R = 0.729), which proved that the calibration was neces-sary for improving the accuracy of phycocyanin concentration.

关键词： phycocyanin case ii waters hyperspectral remote sens-ing model calibrated algorithm.

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Atmospheric correction of Sea WiFS imagery for turbid coastal and inland waters

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Acta Oceanologica Sinica 2004年第4期23卷 609-615页

作者： HEXianqiang PANDelu MAOZhihua KeyLaboratoryofOceanDynamicProcessesandSatelliteOceanographyofStateOceanicAdministration Hangzhou310012China／／SecondInstituteofOceanographyStateOceanicAdministrationHangzhou310012China

A practical algorithm of atmospheric correction for turbid coastal and inland waters is provided. The presentalgorithm uses the property that the water-leaving radiance at 412 nm increases very little with the increasing of waterturbidity. Thus, in very turbid coastal and inland waters, the radiance at 412 nm can be used to estimate the aerosolscattering radiance at 865 nm. The performance of the new algorithm is validated with simulation for several cases. Itis found that the retrieved remotely sensed reflectance is usually with error less than 10% for the first six bands ofSeaWiFS. This new algorithm is also tested under various atmospheric conditions in the Changjiang River Estuaryand the Hangzhou Bay where the sediment concentration is very high and the standard SeaWiFS atmosphericcorrection algorithm creates a mask due to atmospheric correction failure. The result proves the efficiency of thissimple algorithm in reducing the errors of the water-leaving radiance retrieving using SeaWiFS satellite data.

关键词： atmospheric correction SeaWiFS case ii waters

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