Evaluation of the Radiometric Performance of FY-3D MERSI-II Using Dome C, Antarctica
oleh: Zicheng Yin, Teng Li, Linlu Mei, Xiao Cheng, Lei Zheng, Qi Liang, Xinqing Li
| Format: | Article |
|---|---|
| Diterbitkan: | IEEE 2024-01-01 |
Deskripsi
Continuous monitoring and assessment of satellite sensor radiometric response are crucial for timely detection of anomaly of the sensor performance, especially for operational optical sensors (e.g., FY-3D MERSI-II) beyond the expected lifespan. Improving calibration coefficients ensures the acquisition of high-precision and consistent observational Level 1 data records for long time-series researches. To evaluate the radiometric response stability of FY-3D MERSI-II in the reflective solar band, this study constructs parametric simplified and nonsimplified Warren bidirectional reflectance distribution function (BRDF) models using FY-3D MERSI-II nadir observation data at Dome C, Antarctica during the austral summer (October–February in next year) from 2019 to 2023. Subsequently, BRDF correction is applied to eliminate variations in the Dome C data caused by its non-Lambertian nature. The corrected data are analyzed for trends and compared with previous publications. The findings indicate that parameter simplification results in this study improve the calibration accuracy for band 3 (0.650 <inline-formula><tex-math notation="LaTeX">$\bm {\mu }\text{m}$</tex-math></inline-formula>) and band 4 (0.865 <inline-formula><tex-math notation="LaTeX">$\bm {\mu }\text{m}$</tex-math></inline-formula>) by 18.1% and 9.5%, respectively. Further analysis for the instrument degradation reveals that [the total multiyear degradation rate, average annual degradation rate] are within [<inline-formula><tex-math notation="LaTeX">$\pm$</tex-math></inline-formula>2.2%, <inline-formula><tex-math notation="LaTeX">$\pm$</tex-math></inline-formula>0.54%] and [<inline-formula><tex-math notation="LaTeX">$\pm$</tex-math></inline-formula>0.5%, <inline-formula><tex-math notation="LaTeX">$\pm$</tex-math></inline-formula>0.13%], respectively. Comparative validation results demonstrate good agreement with previous studies, showing a deviation of the average annual degradation rate between corresponding bands within <inline-formula><tex-math notation="LaTeX">$\pm$</tex-math></inline-formula>1%. It demonstrates that the stability of the MERSI-II is comparable to MODIS, which is one of the most frequently used medium-resolution sensors over last 25 years.