SeaWiFS与HY-1卫星COCTS的系统交叉辐射校正

海洋一号(HY-1)卫星是中国第一颗海洋环境遥感卫星。由于卫星上没有太阳定标装置,而且其上搭载的水色水温扫描仪(COCTS)一直存在漂移的问题,所以必须不断对其进行辐射校正,所述内容就是其辐射校正方法之一。美国宽视场水色扫描仪(SeaW iFS)提供了高精度的水色数据,如一类水体上的离水辐亮度及叶绿素浓度等被国际水色遥感界作为参照的基准。以SeaW iFS反演的归一化离水辐亮度和气溶胶参数对COCTS遥感器的辐射校正系数进行了系统校正。该方法可以对COCTS的定标系数进行长期监测。结果表明,校正后的COCTS水色数据产品精度得到了很大的提高。

The System Cross-Calibration Between SeaWiFS and HY-1 COCTS

TheHY-1 satellite is the firstsatellite for remote sensing ofocean environment in China. Because there isnoonboard calibration facility and the coefficientofChineseOceanColor&Temperature Scanner(COCTS) hasbeen drifting,calibrations and correctionsmustbe carried out continually. One of the calibration methods is described in this paper.The Sea-viewingW ide Field-of-view Scanner(SeaW iFS) supplies highly accurate ocean color satellite data acknowlegedinternationally, its data for case Iwater, such aswater-leaving radiance and chlorophyll concentration, etc., is regardedas the standard by international fields on remote sensing of ocean color. Therefore, we can adopt the calibrate COCTScontinually by the normalizedwater-leaving radiance and aerosolparameters derived from SeaW iFS. Thismethod can alsobe used tomonitor the long-term charge of calibration coefficientofCOCTS. Our results indicate that the accuracy of thedata retrieved from COCTS can be greatly mi proved after the cross-calibration.