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13 October 2011 The use of MERIS fluorescence bands for red tides monitoring in the East China Sea
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The development of algorithm for the detection and monitoring of red tides, using data from Medium Resolution Imaging Spectrometer (MERIS), is discussed. The interpretation of in-situ measured remote-sensing reflectance spectra above both waters is presented in this paper. And a radiative transfer model based on Matrix Operator techniques is used to study feature of the reflectance peak near 700nm. Based on the analysis of measured and modeled spectrums, the redshift phenomenon is obviously observed above the red tide water. The reflectance peak is observed to shift progressively from a centre wavelength of 683nm (clear and green water) to longer wavelengths (red tide waters). By using MERIS fluorescence bands, the line height at 681 nm (LH681) and 709 nm (LH709) above a baseline through the measurements at 665 nm and 753 nm are calculated. It is found that due to the red-shift phenomenon the LH709 is much higher than LH681 in red tide waters. So in this paper, the ratio of LH709 to LH681 is used as an index to detect the red tides. The results of operational red tide detection in the East China Sea have been presented.
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Bangyi Tao, Zhihua Mao, Difeng Wang, Jianxin Lu, and Haiqing Huang "The use of MERIS fluorescence bands for red tides monitoring in the East China Sea", Proc. SPIE 8175, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2011, 81751K (13 October 2011);

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