研究目的
To present the difference of normalized remote sensing reflectance (Rrs) between SeaWiFS, MERIS and MODIS with in situ data in the South China Sea (SCS).
研究成果
The analysis exhibited that the satellite-derived Rrs is less than in situ data, with the blue band (488 or 490 nm) showing good performances for the three missions. MODIS Rrs performance is better than MERIS or SeaWiFS. The differences between the missions change with band, with 488 nm being the best one, and show seasonal variation in the SCS from 2008 to 2010.
研究不足
The study notes that the satellite-derived Rrs is less than in situ data, suggesting overcorrection of atmospheric effect. The highest uncertainty was observed at NIR (667 nm) band for the three missions. None of the Rrs products of the three missions meet the 5% accuracy requirement.
1：Experimental Design and Method Selection:
The study compares Rrs from SeaWiFS, MERIS, and MODIS with in situ data in the SCS.
2：Sample Selection and Data Sources:
In situ data was collected in the coastal and offshore water of the SCS, using a field spectra radiometer (ASD). Satellite-derived data from MODIS, MERIS, and SeaWiFS Level-2 files were acquired from the NASA Ocean Biology Processing Group.
3：List of Experimental Equipment and Materials:
Field spectra radiometer (ASD).
4：Experimental Procedures and Operational Workflow:
Match-up analyses were performed for Rrs from the satellite products with in situ data, following strict rules for time interval and pixel-box size.
5：Data Analysis Methods:
The study used statistical parameters such as Bias, R2, RMSE, and APD to analyze the differences between satellite-derived and in situ Rrs.
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