研究目的
To evaluate the accuracy of the S2A MSI BOA reflectance and to analyze the impact of the BOA reflectance differences on the calculation of spectral index, e.g. NDVI.
研究成果
The study concludes that a high-accuracy atmospheric correction is crucial for Sentinel-2A data applications, as the Sen2Cor retrieved BOA reflectance shows significant uncertainties and poor correlation in some bands and spectral indices.
研究不足
The limitation of the AOT algorithm in Sen2Cor processor, especially in urban areas with insufficient dark pixels for the DDV algorithm, leading to poor correlation with ground data.
1：Experimental Design and Method Selection:
The study evaluates Sentinel-2A BOA reflectance imageries using the Sen2Cor processor, AERONET measurements, and the 6SV code.
2：Sample Selection and Data Sources:
S2A Level-1C products over Beijing area from Dec 2016 to Nov 2017 and AERONET data from five sites in the domain.
3：List of Experimental Equipment and Materials:
Sentinel-2A MSI, Sen2Cor processor, AERONET measurements, 6SV code.
4：Experimental Procedures and Operational Workflow:
Generation of BOA reflectance by Sen2Cor, comparison with 6SV corrected reflectance, statistical analysis.
5：Data Analysis Methods:
Statistical metrics including correlation coefficient, accuracy, precision, uncertainty, and relative APU.
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