研究目的
To quantitatively analyze and eliminate the influence of adjacency effect in on-orbit radiometric calibration for high-resolution optical sensors.
研究成果
The vicarious radiometric calibration scheme considering adjacent effect correction can bring about total uncertainty of 5.84%. Test on Sentinel-2A imagery indicates that radiometric calibration accuracy after adjacency effect correction was obviously promoted, with relative differences generally lower than 10%.
研究不足
Satellite data used to construct the background reflectance has inadequate temporal coverage, which causes more obvious influence on the low-reflectance black target. Surface reflectance estimation through FLAASH is indicated to be a major error source.
1：Experimental Design and Method Selection:
The study analyzed radiation transfer mechanism and constructed a local atmospheric point spread function model using long time-series satellite-ground synchronous observation data.
2：Sample Selection and Data Sources:
Used Sentinel-2A imagery and ground measurement data from the Baotou Cal&Val site.
3：List of Experimental Equipment and Materials:
Included Cimel CE-318 and surface radiance spectrum automatic measurement systems.
4：Experimental Procedures and Operational Workflow:
Developed an adjacency effect correction method considering background reflectance spectral information.
5：Data Analysis Methods:
Compared simulated apparent reflectance with apparent reflectance directly converted by satellite observation to evaluate the correction method.
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