Long-term cross calibration of HJ-1A CCD1 and Terra MODIS reflective solar bands

Abstract Since its launch on September 6, 2008, HJ-1A has been in the orbit for 13 years. The CCD1 sensor on the HJ-1A has four reflected solar bands. Since the calibration frequency is limited to the annual site calibration, cross-calibration is an effective method to improve the calibration freque...

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Autores principales:	Li Liu, Tingting Shi, Hailiang Gao, Xuewen Zhang, Qijin Han, Xinkai Hu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/bef237b54af84577bb92e2366d3f4024
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spelling	oai:doaj.org-article:bef237b54af84577bb92e2366d3f40242021-12-02T14:25:26ZLong-term cross calibration of HJ-1A CCD1 and Terra MODIS reflective solar bands10.1038/s41598-021-86619-y2045-2322https://doaj.org/article/bef237b54af84577bb92e2366d3f40242021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86619-yhttps://doaj.org/toc/2045-2322Abstract Since its launch on September 6, 2008, HJ-1A has been in the orbit for 13 years. The CCD1 sensor on the HJ-1A has four reflected solar bands. Since the calibration frequency is limited to the annual site calibration, cross-calibration is an effective method to improve the calibration frequency. In this paper, we use 420 image pairs of HJ-1A CCD1 and Terra MODIS over the Dunhuang test site for gains calculation, where we take MODIS as the reference sensor. The spectral band adjustment factors (SBAFs) for cross-calibration are then calculated to compensate for the spectral mismatch. The cross-calibration results are also validated by the field calibration results. From 2008 to 2019, a total of six campaigns have been cross-calibrated on the same day. The gain difference between the site calibration and cross-calibration is less than 3%. The long-term cross-calibration results further indicate that due to the adjustment of HJ-1A CCD gain state in October 2009, an abrupt change occurred 405 days after launch. After 12 years of on-orbit operation, the attenuation rate has reached 23.51%, 21.89%, 8.11%, and 13.37%, respectively by the end of 2019 based on the cross-calibration results.Li LiuTingting ShiHailiang GaoXuewen ZhangQijin HanXinkai HuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Li Liu Tingting Shi Hailiang Gao Xuewen Zhang Qijin Han Xinkai Hu Long-term cross calibration of HJ-1A CCD1 and Terra MODIS reflective solar bands
description	Abstract Since its launch on September 6, 2008, HJ-1A has been in the orbit for 13 years. The CCD1 sensor on the HJ-1A has four reflected solar bands. Since the calibration frequency is limited to the annual site calibration, cross-calibration is an effective method to improve the calibration frequency. In this paper, we use 420 image pairs of HJ-1A CCD1 and Terra MODIS over the Dunhuang test site for gains calculation, where we take MODIS as the reference sensor. The spectral band adjustment factors (SBAFs) for cross-calibration are then calculated to compensate for the spectral mismatch. The cross-calibration results are also validated by the field calibration results. From 2008 to 2019, a total of six campaigns have been cross-calibrated on the same day. The gain difference between the site calibration and cross-calibration is less than 3%. The long-term cross-calibration results further indicate that due to the adjustment of HJ-1A CCD gain state in October 2009, an abrupt change occurred 405 days after launch. After 12 years of on-orbit operation, the attenuation rate has reached 23.51%, 21.89%, 8.11%, and 13.37%, respectively by the end of 2019 based on the cross-calibration results.
format	article
author	Li Liu Tingting Shi Hailiang Gao Xuewen Zhang Qijin Han Xinkai Hu
author_facet	Li Liu Tingting Shi Hailiang Gao Xuewen Zhang Qijin Han Xinkai Hu
author_sort	Li Liu
title	Long-term cross calibration of HJ-1A CCD1 and Terra MODIS reflective solar bands
title_short	Long-term cross calibration of HJ-1A CCD1 and Terra MODIS reflective solar bands
title_full	Long-term cross calibration of HJ-1A CCD1 and Terra MODIS reflective solar bands
title_fullStr	Long-term cross calibration of HJ-1A CCD1 and Terra MODIS reflective solar bands
title_full_unstemmed	Long-term cross calibration of HJ-1A CCD1 and Terra MODIS reflective solar bands
title_sort	long-term cross calibration of hj-1a ccd1 and terra modis reflective solar bands
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/bef237b54af84577bb92e2366d3f4024
work_keys_str_mv	AT liliu longtermcrosscalibrationofhj1accd1andterramodisreflectivesolarbands AT tingtingshi longtermcrosscalibrationofhj1accd1andterramodisreflectivesolarbands AT hailianggao longtermcrosscalibrationofhj1accd1andterramodisreflectivesolarbands AT xuewenzhang longtermcrosscalibrationofhj1accd1andterramodisreflectivesolarbands AT qijinhan longtermcrosscalibrationofhj1accd1andterramodisreflectivesolarbands AT xinkaihu longtermcrosscalibrationofhj1accd1andterramodisreflectivesolarbands
_version_	1718391392925908992

Long-term cross calibration of HJ-1A CCD1 and Terra MODIS reflective solar bands

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