海洋水色传感器零电平漂移校正方法探讨

某海洋水色传感器数据异常,反演产品中有大量不规则条带.通过对大量数据进行分析,确定其数据异常的主要原因是各波段均受箝位(即零电平漂移)的影响.为此,提出了基于某一清洁水体点,利用自由平差原理进行箝位校正的方法.其次,将该箝位校正方法应用于遥感影像,并对校正后的影像进行了叶绿素浓度反演,反演产品均匀性较好,细节丰富.最后,将反演产品与MODIS/Aqua 产品进行了比较,表明经过箝位校正后的信号恢复正常.从而为箝位校正研究提供了一个新的方法,为海洋水色传感器的定量化应用提供一些支持.

STUDY ON THE METHOD OF CORRECTION FOR OCEAN COLOR SENSOR ZERO-VOLTAGE FLUCTUATION

The data of an ocean color sensor is abnormal. There are many irregular strips in the retrieved products. Analy- sis of a large set of data confirms that the data abnormality is mainly due to the influence of clamping (zero-voltage fluctua- tion) on each waveband. Thus, a method based on clear water free network adjustment was put forward for repairing the clamping. Then, the clamping repair method was applied to the remote sensing image and the chlorophyll concentration was retrieved from the clamping repaired image. The retrieved products have excellent uniformity and abundant detail. Finally, the comparison between the retrieved and MODIS/Aqua products demonstrates that the clamping repaired signal is right. It provides a new method for the clamping repair and a support for the quantitative application of ocean color sensor.