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5 October 2007 Improving the accuracy of water and bottom properties derived from remote sensing reflectance via artificial neural network
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Abstract
Artificial neural network has been proven a useful technique for deriving water and bottom properties from remote sensing upwelling radiance. Conventionally, a neural network is trained to minimize the overall mean square error of desired products. The approach does not explicitly take into account the change of spectral shapes of upwelling radiance. In this study, we have created four groups of training sets, two groups with ratios of Rrs( λi) to Rrs(557), and the others without. Ratios of Rrs( λi) to Rrs(557) for λi of 409nm, 438nm, 488nm, 507nm, 616nm, 665nm, 683nm, 712nm, 750nm and 779nm have been used as additional inputs in the training of neural networks. Trained neural networks were then applied to an independent testing set which was created for optically different coastal waters. The inclusion of 10 spectral ratios in the training significantly improves the accuracy of derived water depth H, backscattering coefficient bb(438) and the absorption coefficient a(438). The accuracy of the derived coefficients is 86%, 94% and 92%. Our results clearly show the importance for including spectral ratios in the neural network training process. Remote sensing upwelling radiance over the identified 11 spectral channels provides adequate information for the retrieval of water optical property coefficients when an artificial neural network approach is used.
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Mingrui Zhang, ZhongPing Lee, and Jinyan Guan "Improving the accuracy of water and bottom properties derived from remote sensing reflectance via artificial neural network", Proc. SPIE 6680, Coastal Ocean Remote Sensing, 668008 (5 October 2007); https://doi.org/10.1117/12.731760
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