Long time series cross radiometric calibration of HJ-1A/CCD1

doi:10.7523/j.ucas.2024.067

Abstract

Abstract: Huanjing-1A (HJ-1A) CCD1 has four reflected solar bands in visible and near-infrared bands. The on-orbit absolute radiometric calibration frequency of HJ1A/CCD1 is limited to the annual site calibration. Cross calibration, as a supplement means of site calibration, can achieve high-frequency on-orbit absolute radiometric calibration. In this paper, we select Terra/MOIDS as the reference sensor to perform long time series cross calibration on HJ-1A/CCD1 based on Dunhuang calibration site. By limiting conditions such as the imaging angle difference (less than 20°), the imaging time difference (less than 2 hours), cloud cover, and imaging quality between HJ1A/CCD1 and Terra/MODIS, a total of 147 effective cross calibration image pairs were screened out from September 2021 to December 2021. Then the 6SV v2.1 radiative transfer model was used to calculate the spectral band adjustment factor, and ultimately achieving long time series cross calibration of HJ-1A/CCD1. The results show that: (1) The cross-calibration coefficients calculated in this article are highly consistent with the officially published calibration coefficients, with an average relative difference of less than 2.25%. The calibration uncertainty is within 5.34%. (2) The long time series cross calibration results show that after one year on-orbit operation, the gain status of HJ-1A/CCD1 was adjusted on October 20, 2009, resulting in a sudden change in the cross-calibration coefficients on the 409th day after launch. After the adjustment, the overall radiometric performance was relatively stable. (3) The radiometric performance of HJ-1A/CCD1 showed a slow and fluctuating downward trend from October 2009 to December 2021, with an annual attenuation rate of less than 3.10%. The method proposed in this paper can effectively improve the radiometric calibration frequency and accuracy, and can be used for radiometric performance monitoring over the whole life cycle of HJ-1A/CCD1.

Key words: remote sensing, cross calibration, HJ-1A/CCD1, MODIS, uncertainty analysis

CLC Number:

P237

MA Zhonghui, CUI Zhenzhen, YAN Dongchuan, LIU Bingjie, WAN Yi, WANG Zhiqiang, ZHANG Chenglong. Long time series cross radiometric calibration of HJ-1A/CCD1[J]. Journal of University of Chinese Academy of Sciences, DOI: 10.7523/j.ucas.2024.067.

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