Deviation Analysis On GOCI,VIIRS And MODIS Remote Sensing Reflectance Products In China Offshore Area

As the primary geophysical parameter and core of ocean color remote sensing research,the ocean color remote sensing reflectance product has been widely used as a basis for many ocean color products,and laid the foundation for the development of color ocean remote sensing.Due to the inherent uncertainties in the acquisition process of remote sensing reflectance products,it is necessary to assessment the authenticity of remote sensing reflectance.Cross-validation among different satellites have been a reliable means which improved the limitations of satellite-in situ validation,such as scale.As its essence,it is necessary to further study the deviation analysis of remote sensing reflectance between different satellites for widespread use and multi-sensor data fusion.This paper takes the optically-complex waters of China's offshore(East Sea and Yellow Sea)as the research area,using GOCI,VIIRS and MODIS(Aqua)remote sensing reflectance products with less cloud,and matched and established the data sets of GOCI-VIIRS,GOCI-MODIS(Aqua),MODIS(Aqua)-VIIRS remote sensing reflectance products according to the matching principle,and the deviations in different ocean color remote sensing reflectance products are analyzed.The results show that:(1)GOCI,VIIRS,MODIS(Aqua)remote sensing reflectance products(except 412nm band)have strong consistency,the fitted curve R~2 for remote sensing reflectance is higher than 0.91 in 490nm and 555nm bands;(2)Deviation of MODIS(Aqua)-VIIRS is smaller than MODIS(Aqua)-GOCI or MODIS(Aqua)-VIIRS and the RMSE is1.97841E-4 in 667nm band;(3)the deviation between MODIS(Aqua)-VIIRS-GOCI is mainly related to sensor imaging geometry,which causing a seasonal effect–the deviation in summer the largest(more than 30%),and the spring and autumn is relatively small.When the difference of the solar azimuth less than 1°,the deviation of the remote sensing reflectance basically more than 30%except the 490nm and 555nm band;(4)Followed by the spatial distribution(in the region of 125.2°~126.8°E and26.2°~30°N and the Bohai Sea,most of bands of GOCI-VIIRS,GOCI-MODIS(Aqua),MODIS(Aqua)-VIIRS have large deviations in remote sensing reflectance except490nm band,and the concentration of ocean color elements plays a supporting role.