Radiometric Response Evaluation of FY-3D/MERSI-II Reflective Solar Bands Based on Deep Convective Cloud

Bei Zhang; Xiuqing Hu; Weiwei Zhou; Ling Wang; Lin Chen; Peng Zhang

doi:10.3788/AOS230842

Acta Optica Sinica, Volume. 43, Issue 18, 1828003(2023)

Radiometric Response Evaluation of FY-3D/MERSI-II Reflective Solar Bands Based on Deep Convective Cloud

Bei Zhang^1,2, Xiuqing Hu^1,2、*, Weiwei Zhou³, Ling Wang^1,2, Lin Chen^1,2, and Peng Zhang^1,2

¹National Satellite Meteorological Center (National Center for Space Weather), Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, China Meteorological Administration, Beijing 100081, China

²Innovation Center for FengYun Meteorological Satellite (FYSIC), Beijing 100081, China

³School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China

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Figures & Tables(13)

Fig. 1. Flowchart of the MERSI-II radiometric response evaluate method based on DCC

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Fig. 2. DCC reflectance PDF curves for different VZA angle intervals. (a) 0.65 μm; (b) 1.64 μm

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Fig. 3. Normalized monthly DCC reflectance corrected by BRDF models from 2018 to 2022. (a) 0.65 μm; (b) 1.64 μm

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Fig. 4. Geographical distribution of monthly DCC from 2020 to 2022. (a) Every April; (b) every July

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Fig. 5. Annual variation curves of DCC monthly reflectance from 2018 to 2022. (a) 1.64 μm; (b) 2.13 μm

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Fig. 6. Seasonal correction factor of DCC

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Fig. 7. Comparison of deseasonalization and BRDF correction results. (a) 0.65 μm; (b) 0.865 μm; (c) 1.64 μm; (d) 2.13 μm

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Fig. 8. Normalized monthly DCC reflectance and linear fitting of FY-3D/MERSI-II in RSB from 2018 to 2022. (a) VIS bands; (b) NIR bands; (c) SWIR bands

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Table 1. FY-3D/MERSI-II spectral channel specifications

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Table 1. FY-3D/MERSI-II spectral channel specifications

Band	Central wavelength /μm	Spectra bandwidth /μm	Resolution /m	Dynamic range
1	0.470	50	250	90%
2	0.550	50	250	90%
3	0.650	50	250	90%
4	0.865	50	250	90%
5	1.380	20/30	1000	90%
6	1.640	50	1000	90%
7	2.130	50	1000	90%
8	0.412	20	1000	30%
9	0.443	20	1000	30%
10	0.490	20	1000	30%
11	0.555	20	1000	30%
12	0.670	20	1000	30%
13	0.709	20	1000	30%
14	0.746	20	1000	30%
15	0.865	20	1000	30%
16	0.905	20	1000	100%
17	0.936	20	1000	100%
18	0.940	50	1000	100%
19	1.030	20	1000	100%
20	3.800	180	1000	200-350 K
21	4.050	155	1000	200-380 K
22	7.200	500	1000	180-280 K
23	8.550	300	1000	180-300 K
24	10.800	1000	250	180-330 K
25	12.000	1000	250	180-330 K

Table 2. Standard deviation of PDF reflectance mean (mode) in different VZA angle intervals

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Table 2. Standard deviation of PDF reflectance mean (mode) in different VZA angle intervals

Band	Center wavelength /μm	Standard deviation of mean（mode）/%
Band	Center wavelength /μm	No BRDF	Hu BRDF	CERES BRDF
1	0.470	2.32（1.93）	2.22（1.94）	1.93（0.76）
2	0.550	2.62（2.13）	2.72（2.11）	2.33（0.83）
3	0.650	2.73（2.22）	2.45（2.01）	1.65（0.77）
4	0.865	1.63（1.58）	1.53（1.42）	1.66（0.73）
5	1.380	0.83（1.08）	1.13（1.28）	1.16（1.33）
6	1.640	0.82（0.89）	0.87（0.96）	0.98（1.10）
7	2.130	0.76（0.88）	1.26（1.36）	1.08（1.21）
16	0.905	1.44（1.28）	1.43（1.12）	1.41（0.53）
17	0.936	1.53（1.28）	1.58（1.17）	1.66（0.73）
18	0.940	1.22（1.08）	1.37（1.04）	1.66（0.67）
19	1.030	1.47（1.13）	1.33（1.02）	1.67（0.74）

Table 3. Decline rates of DCC reflectance RSD and fluctuation in each channel after deseasonal correction

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Table 3. Decline rates of DCC reflectance RSD and fluctuation in each channel after deseasonal correction

Spectral band /μm	Decline rate of RSD /%	Decline rate of 2δ/mean /%
0.470	10.3	29.9
0.550	9.6	27.3
0.650	28.9	44.3
0.865	16.7	30.5
1.380	22.4	52.7
1.640	22.0	51.2
2.130	23.9	54.5
0.905	17.6	33.5
0.936	18.3	35.6
0.940	18.1	32.4
1.030	20.4	42.8

Table 4. Summary of the research area, data, and methods

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Table 4. Summary of the research area, data, and methods

Condition	Parameter
Spectral bands	B1-B7，B16-19
Data time	2018—2022
Longitude /（^o）	-180-+180
Latitude /（^o）	-20-+20
SZA，VZA /（^o）	≤40
IR-BT threshold /K	≤205
IR-BT uniformity threshold /K	≤1
VIS uniformity threshold /%	≤3
Reflectance	Monthly PDF mode（VIS/NIR），mean（SWIR）
Reflectance correction	CERES ice cloud BRDF（VIS/NIR），deseasonal（SWIR）

Table 5. Results of FY-3D/MERSI-II reflected solar bands radiation response degradation from 2018 to 2022

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Table 5. Results of FY-3D/MERSI-II reflected solar bands radiation response degradation from 2018 to 2022

Band	Central wavelength /μm	Reflectance mean	Total degradation rate /%	Annual degradation rate /%	σ/%
1	0.470	0.8999	6.9110	1.3820	1.1740
2	0.550	0.8853	1.7330	0.3466	0.9643
3	0.650	0.8957	0.1428	0.0286	0.9640
4	0.865	0.9178	2.2060	0.4412	1.0640
5	1.380	0.5023	16.1500	3.2310	4.0120
6	1.640	0.2248	15.5700	3.1140	3.5650
7	2.130	0.1501	10.6700	2.1340	3.1670
16	0.905	0.8617	2.5540	0.5108	1.7270
17	0.936	0.7571	3.6040	0.7208	2.5310
18	0.940	0.8424	4.5720	0.9144	2.9850
19	1.030	0.8223	9.7620	1.9520	1.1910

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Bei Zhang, Xiuqing Hu, Weiwei Zhou, Ling Wang, Lin Chen, Peng Zhang. Radiometric Response Evaluation of FY-3D/MERSI-II Reflective Solar Bands Based on Deep Convective Cloud[J]. Acta Optica Sinica, 2023, 43(18): 1828003

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Paper Information

Category: Remote Sensing and Sensors

Received: Apr. 18, 2023

Accepted: Jul. 18, 2023

Published Online: Sep. 11, 2023

The Author Email: Xiuqing Hu (huxq@cma.cn)

DOI:10.3788/AOS230842

Topics

laser devices and laser physics

Lasers and Laser Optics

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laser manufacturing

Instrumentation, Measurement and Metrology