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Atmospheric correction of SeaWiFS imagery: assessment of the use of alternative bands

机译：SeaWiFS影像的大气校正：替代频段的使用评估

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摘要

Spatial inhomogeneity, or speckling, frequently occurs in Sea-viewing Wide Field-of-view Sensor (Sea-WiFS) data products such as water-leaving radiance and chlorophyll concentration. We have found that this effect may be caused by high-altitude aerosols or thin cirrus clouds or even by digitization errors. For the scenes evaluated, whitecaps were ruled out as a likely cause of these errors. We tried to avoid using the 765-nm band, which is affected by O_(2) absorption and is more sensitive to digitization errors, by instead using the 670-nm band in the atmospheric correction and found that speckling for either cloud-free areas or cloud-adjacent areas was significantly reduced.
机译：在海景宽视野传感器（Sea-WiFS）数据产品中经常出现空间不均匀或斑点现象，例如水辐射辐射和叶绿素浓度。我们已经发现，这种影响可能是由高空气溶胶或薄卷云甚至是数字化错误引起的。对于所评估的场景，排除了白帽子是造成这些错误的可能原因。我们尝试避免使用受O_（2）吸收影响并且对数字化误差更敏感的765 nm波段，而是在大气校正中使用670 nm波段，发现对于任一无云区域都存在斑点或与云相邻的区域显着减少。

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