Identification and Normalization of Image Gain of FY-3A MERSI Shortwave Infrared Bands

Axin Fan; Na Xu; Tingfa Xu; Xiuqing Hu; Jihui Wang; Yuqing He; Jizhou Zhang; Ronghua Wu; Hanlie Xu

doi:10.3788/AOS201838.1111001

Journals >Acta Optica Sinica >Volume 38 >Issue 11 >Page 1111001 > Article

Acta Optica Sinica
Vol. 38, Issue 11, 1111001 (2018)

Identification and Normalization of Image Gain of FY-3A MERSI Shortwave Infrared Bands

Axin Fan^1、*, Na Xu^2、3、*, Tingfa Xu^1、*, Xiuqing Hu^2、3, Jihui Wang¹, Yuqing He¹, Jizhou Zhang¹, Ronghua Wu^2、3, and Hanlie Xu^2、3

Author Affiliations

¹ Key Laboratory of Photoelectric Imaging Technology and System of Ministry of Education, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China

² National Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, China

³ Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, China Meteorological Administration, Beijing 100081, China

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DOI: 10.3788/AOS201838.1111001 Cite this Article Set citation alerts

Axin Fan, Na Xu, Tingfa Xu, Xiuqing Hu, Jihui Wang, Yuqing He, Jizhou Zhang, Ronghua Wu, Hanlie Xu. Identification and Normalization of Image Gain of FY-3A MERSI Shortwave Infrared Bands[J]. Acta Optica Sinica, 2018, 38(11): 1111001 Copy Citation Text

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Fig. 1. MERSI scan pattern

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Fig. 2. Relation between daily variations of onboard calibration source targets and latitude and solar zenith angle at 2.13 μm. (a) SV; (b) VOC; (c) BB

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Fig. 3. SV variation of 2.13 μm in 2012

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Fig. 4. Gain classification process and resultsat 1.64 μm. (a) Original jump SV; (b) sorted jump SV; (c) sorted SV ratio; (d) SV ratio classification

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Fig. 5. Normalized effect of SV at 1.64 and 2.13 μm during the lifetime. (a)(d) Daily average SV; (b)(e) normalized results using theoretical levels; (c)(f) normalized results using actual levels

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Fig. 6. Normalized effect of onboard calibration source targets at 2.13 μm on August 24, 2012. Panels (a)(c)(e) SV, VOC, BB before normalization using actual levels; (b)(d)(f) SV, VOC, BB after normalization using actual levels

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Fig. 7. Normalized effect of EV images (a)(b) at 1.64 μm on August 24, 2010 and (c)(d) at 2.13 μm on June 24, 2012

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Threshold value	δ₁	δ₂	δ₃	δ₄	α
Value	0.06	0.09	1.5	0.03	0.002
δ basis	The minimum variation of eight preset gain levels (1, 1.1, 1.2, 1.3, 1.43, 1.57, 1.7, and 1.87) is 0.076 and the maximum is 0.87.
α basis	The average variation of non-polluted SV values of 2.13 μm is 0.002 from October 1, 2010 to December 31, 2010.

Table 1. Threshold value and basis of automatic identification and gain classification

Date	Theoretical level	Actual level	Date	Theoretical level	Actual level
Date	Before jump		After jump		Before jump	After jump	Before jump	After jump		Before jump	After jump
2009-03-02	1.0	1.1	1.00	1.09	2013-07-23	1.57	1.87	1.51	1.78
2009-03-13	1.1	1.3	1.09	1.28	2013-07-29	1.87	1.43	1.78	1.39
2009-05-29	1.3	1.87	1.28	1.78	2013-08-01	1.43	1.57	1.39	1.51
2009-07-14	1.87	1.43	1.78	1.39	2013-08-02	1.57	1.87	1.51	1.78
2009-08-17	1.43	1.57	1.39	1.51	2013-10-14	1.87	1.0	1.78	1.00
2009-08-25	1.57	1.7	1.51	1.64	2014-02-24	1.0	1.1	1.00	1.09
2009-08-26	1.7	1.87	1.64	1.78	2014-02-24	1.1	1.2	1.09	1.19
2009-08-29	1.87	1.0	1.78	1.00	2014-02-25	1.2	1.3	1.19	1.28
2009-09-06	1.0	1.1	1.00	1.09	2014-02-28	1.3	1.87	1.28	1.78
2009-10-04	1.1	1.3	1.09	1.28	2014-02-28	1.87	1.0	1.78	1.00
2009-10-09	1.3	1.43	1.28	1.39	2014-04-26	1.0	1.1	1.00	1.09
2009-10-14	1.43	1.57	1.39	1.51	2014-04-27	1.1	1.2	1.09	1.19
2009-10-30	1.57	1.7	1.51	1.64	2014-05-16	1.2	1.3	1.19	1.28
2009-11-18	1.7	1.0	1.64	1.00	2014-05-21	1.3	1.43	1.28	1.39
2010-03-06	1.0	1.1	1.00	1.09	2014-05-23	1.43	1.57	1.39	1.51
2010-03-12	1.1	1.2	1.09	1.19	2014-05-23	1.57	1.87	1.51	1.78
2010-03-29	1.2	1.3	1.19	1.28	2014-05-25	1.87	1.43	1.78	1.39
2010-06-10	1.3	1.87	1.28	1.78	2014-05-26	1.43	1.57	1.39	1.51
2010-08-24	1.87	1.0	1.78	1.00	2014-05-27	1.57	1.7	1.51	1.64
2010-09-13	1.0	1.1	1.00	1.09	2014-05-29	1.7	1.87	1.64	1.78
2012-03-18	1.1	1.2	1.09	1.19	2014-05-30	1.87	1.1	1.78	1.09
2012-04-11	1.2	1.3	1.19	1.28	2014-05-31	1.1	1.2	1.09	1.19
2012-05-22	1.3	1.0	1.28	1.00	2014-06-02	1.2	1.3	1.19	1.28
2012-05-30	1.0	1.1	1.00	1.09	2014-06-05	1.3	1.43	1.28	1.39
2012-06-24	1.1	1.3	1.09	1.28	2014-06-06	1.43	1.57	1.39	1.51
2012-07-02	1.3	1.87	1.28	1.78	2014-06-06	1.57	1.7	1.51	1.64
2012-07-04	1.87	1.0	1.78	1.00	2014-06-06	1.7	1.87	1.64	1.78
2012-07-08	1.0	1.1	1.00	1.09	2014-06-10	1.87	1.0	1.78	1.00
2012-08-22	1.1	1.2	1.09	1.19	2014-06-16	1.0	1.1	1.00	1.09
2012-08-23	1.2	1.3	1.19	1.28	2014-06-28	1.1	1.2	1.09	1.19
2012-08-24	1.3	1.43	1.28	1.39	2014-07-03	1.2	1.3	1.19	1.28
2012-09-04	1.43	1.57	1.39	1.51	2014-07-03	1.3	1.87	1.28	1.78
2012-09-09	1.57	1.87	1.51	1.78	2014-07-04	1.87	1.0	1.78	1.00
2012-09-10	1.87	1.0	1.78	1.00	2014-07-06	1.0	1.1	1.00	1.09
2012-10-29	1.0	1.1	1.00	1.09	2014-07-07	1.1	1.2	1.09	1.19
2012-11-14	1.1	1.2	1.09	1.19	2014-07-12	1.2	1.3	1.19	1.28
2012-12-31	1.2	1.3	1.19	1.28	2014-07-14	1.3	1.57	1.28	1.51
2013-01-03	1.3	1.43	1.28	1.39	2014-07-15	1.57	1.7	1.51	1.64
2013-01-05	1.43	1.57	1.39	1.51	2014-07-23	1.7	1.87	1.64	1.78
2013-01-08	1.57	1.87	1.51	1.78	2014-07-24	1.87	1.43	1.78	1.39
2013-01-15	1.87	1.0	1.78	1.00	2014-07-24	1.43	1.57	1.39	1.51
2013-03-07	1.0	1.1	1.00	1.09	2014-07-24	1.57	1.7	1.51	1.64
2013-06-14	1.1	1.3	1.09	1.28	2014-07-27	1.7	1.0	1.64	1.00
2013-07-06	1.3	1.87	1.28	1.78	2014-07-29	1.0	1.1	1.00	1.09
2013-07-20	1.87	1.43	1.78	1.39	2014-07-30	1.1	1.2	1.09	1.19
2013-07-23	1.43	1.57	1.39	1.51

Table 2. Detailed information of all gain jumps at 1.64 μm

Date	Theoretical level	Actual level	Date	Theoretical level	Actual level
Date	Before jump		After jump		Before jump	After jump	Before jump	After jump		Before jump	After jump
2009-03-02	1.0	1.1	1.00	1.09	2012-04-11	1.0	1.1	1.00	1.09
2009-08-24	1.1	1.3	1.09	1.26	2012-05-22	1.1	1.0	1.09	1.00
2009-09-10	1.3	1.7	1.26	1.77	2012-06-20	1.0	1.1	1.00	1.09
2009-10-30	1.7	1.0	1.77	1.00	2012-06-24	1.1	1.3	1.09	1.26
2010-03-06	1.0	1.1	1.00	1.09	2012-08-24	1.3	1.87	1.26	1.77
2010-03-12	1.1	1.2	1.09	1.16	2013-06-21	1.87	1.7	1.77	1.66
2010-05-31	1.2	1.3	1.16	1.26	2013-07-29	1.7	1.87	1.66	1.77
2010-08-24	1.3	1.7	1.26	1.77	2014-02-28	1.87	1.43	1.77	1.42
2010-09-13	1.7	1.0	1.77	1.00	2014-04-26	1.43	1.57	1.42	1.56

Table 3. Detailed information of all gain jumps at 2.13 μm

Level	Index	1	2	3	4	5	6	7	8	Average
1.64 μm	Theoretical	1.0	1.1	1.2	1.3	1.43	1.57	1.7	1.87
	Actual	1.00	1.09	1.19	1.28	1.39	1.51	1.64	1.78
	Deviation /%	0	0.92	0.84	1.56	2.88	3.97	3.66	5.06	2.36
2.13 μm	Theoretical	1.0	1.1	1.2	1.3	1.43	1.57	1.7	1.87
	Actual	1.00	1.09	1.16	1.26	1.42	1.56	1.66	1.77
	Deviation /%	0	0.92	3.45	3.17	0.70	0.64	2.41	5.65	2.12

Table 4. Deviation between theoretical and actual levels at 1.64 μm and 2.13 μm

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