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Elimination of negative water leaving radiance in atmospheric correction of ocean colour

机译：消除负面水留下大气校正海洋颜色的辐射

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A simple modification is proposed to the standard dark water atmospheric correction method for ocean colour imagery from satellites such as SeaWiFS, to eliminate negative water leaving radiance which can result from the extrapolation of aerosol effects from the near infrared. The standard method uses a library of aerosol models, finding the two models for which the retrieved water leaving radiance in two near infrared channels is closest to zero and combining them to make it exactly zero (the dark water approximation). These models are then used to calculate the water leaving radiance in the visible. The modification is applied wherever the standard correction results in negative water leaving radiance in the visible. The aerosol library is re-examined, and an attempt is made to find an alternative pair of models which may be combined to give water leaving radiance that is zero in the near infrared, but non-negative in the visible.
机译：从诸如Seawifs等卫星的海洋彩色图像的标准暗水大气校正方法提出了一种简单的修改，消除了负水留下辐射，这可能是由近红外线的外推气溶胶效应产生的辐射。标准方法使用气溶胶模型库，找到两种型号，其中留下两个近红外通道中的辐射辐射的辐射最接近零，并将它们组合以使其完全零（深水近似）。然后使用这些模型来计算留下可见光亮的水。在标准校正导致负水处留下可见光的辐射，施加修改。重新检查气溶胶库，并尝试找到一种替代的模型，该模型可以组合以使水留下近红外线的辐射，但可见的非负。

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