In-Flight Relative Radiometric Calibration of a Wide Field of View Directional Polarimetric Camera Based on the Rayleigh Scattering over Ocean

doi:10.3390/rs14051211

	In-Flight Relative Radiometric Calibration of a Wide Field of View Directional Polarimetric Camera Based on the Rayleigh Scattering over Ocean
	Zhu, Sifeng 1,2,3; Li, Zhengqiang 1,2,3; Qie, Lili 3; Xu, Hua 3; Ge, Bangyu 3; Xie, Yisong 3; Qiao, Rui 3; Xie, Yanqing 2,3; Hong, Jin 4; Meng, Binghuan 4
刊名	REMOTE SENSING
	2022-03-01
卷号	14
关键词	DPC calibration Rayleigh scattering wide field of view relative radiometric correction
DOI	10.3390/rs14051211
通讯作者	Li, Zhengqiang(lizq@radi.ac.cn)
英文摘要	The directional polarimetric camera (DPC) is a Chinese satellite sensor with a large field of view (FOV) (+/- 50 degrees both along-track and cross-track) and a high spatial resolution (about 3.3 km at nadir) that operates in a sun-synchronous orbit. It is a difficult task to calibrate the in-flight relative radiometric variation of the sensors with such a wide FOV. In this study, a new method based on Rayleigh scattering over the ocean is developed to estimate the radiometric sensitivity variation over the whole FOV of DPC. Firstly, the theoretical uncertainty of the method is analyzed to calibrate the relative radiometric response. The calibration uncertainties are about 2-6.9% (depending on the wavelength) when the view zenith angle (VZA) is 0 degrees and decrease to about 1-3.8% when VZA increases to 70 degrees. Then, the method is applied to evaluate the long-term radiometric drift of the DPC. It is found that the radiometric response of DPC/GaoFen-5 over the whole FOV is progressively drifting over time. The sensitivity at shorter bands decreases more strongly than longer bands, and at the central part of the optics decreases more strongly than the marginal part. During the 14 months (from March 2019 to April 2020) of operational running in-orbit, the DPC radiometric responses of 443 nm, 490 nm, 565 nm, and 670 nm bands drifted by about 4.44-23.08%, 4.75-16.22%, 3.86-9.81%, and 4.7-16.86%, respectively, from the marginal to the central part of the FOV. The radiometric sensitivity has become more stable since January 2020. The monthly radiometric drift is separated into the relative radiometric part and the absolute radiometric part. The relative radiometric drift of DPC is found to be smoothly varying with VZA, which can be parameterized as a polynomial function via VZA. At last, the temporal radiometric drift of DPC/GaoFen-5 is corrected by combining the relative and absolute radiometric coefficients. The correction is convincing by cross calibration with MODIS/Aqua observation over the desert sites and improving the aerosol retrievals. The Rayleigh method in this study is efficient for the radiometric sensitivity calibration of wide FOV satellite sensors.
资助项目	Finance science and technology project of Hainan province[ZDYF2020206] ; National Outstanding Youth Foundation of China[41925019] ; National Natural Science Foundation of China[42175148] ; National Natural Science Foundation of China[42175147]
WOS关键词	CROSS-CALIBRATION ; DESERT SITES ; SATELLITE ; MODIS
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Remote Sensing ; Imaging Science & Photographic Technology
语种	英语
出版者	MDPI
WOS记录号	WOS:000774136900001
资助机构	Finance science and technology project of Hainan province ; National Outstanding Youth Foundation of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/128255]
专题	中国科学院合肥物质科学研究院
通讯作者	Li, Zhengqiang
作者单位	1.Chinese Acad Sci, Hainan Res Inst, Aerosp Informat Res Inst, Key Lab Earth Observat Hainan Prov, Sanya 572029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Aerosp Informat Res Inst, State Environm Protect Key Lab Satellite Remote S, Beijing 100101, Peoples R China 4.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Hefei 230031, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Sifeng,Li, Zhengqiang,Qie, Lili,et al. In-Flight Relative Radiometric Calibration of a Wide Field of View Directional Polarimetric Camera Based on the Rayleigh Scattering over Ocean[J]. REMOTE SENSING,2022,14.
APA	Zhu, Sifeng.,Li, Zhengqiang.,Qie, Lili.,Xu, Hua.,Ge, Bangyu.,...&Chen, Feinan.(2022).In-Flight Relative Radiometric Calibration of a Wide Field of View Directional Polarimetric Camera Based on the Rayleigh Scattering over Ocean.REMOTE SENSING,14.
MLA	Zhu, Sifeng,et al."In-Flight Relative Radiometric Calibration of a Wide Field of View Directional Polarimetric Camera Based on the Rayleigh Scattering over Ocean".REMOTE SENSING 14(2022).