Inversion of Land Surface Emissivity in China Based on FY-2G Infrared Satellite Data

Lu Han; Shengcheng Cui; Shizhi Yang; Wenqiang Lu; Jianjun Shi; Qiang Zhao

doi:10.3788/AOS201939.1228003

Acta Optica Sinica, Volume. 39, Issue 12, 1228003(2019)

Inversion of Land Surface Emissivity in China Based on FY-2G Infrared Satellite Data

Lu Han^1,2, Shengcheng Cui^1、*, Shizhi Yang¹, Wenqiang Lu^1,2, Jianjun Shi^1,2, and Qiang Zhao³

¹Key Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China

²Science Island Branch of Graduate School, University of Science and Technology of China, Hefei, Anhui 230031, China

³School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei, Anhui 230601, China

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Figures & Tables(11)

Fig. 1. FY-2G IR1 channel data after cloud detection under Lambert projection on Oct 15, 2015, UTC 03:00

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Fig. 2. Spectral response functions of FY-2G thermal infrared channels IR1 and IR2 and MODIS thermal infrared channels 31 and 32

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Fig. 3. Temperature-independent thermal infrared spectral indices on Oct 15, 2015, UTC 19:00. (a) T_TISIE,4,1 obtained by combining channel 4 with channel 1; (b) T_TISIE,4,2 obtained by combining channel 4 with channel 2

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Fig. 4. Inversion results of LSE. (a) LSE of FY-2G IR1(Oct 15, 2015, UTC 03:00); (b) LSE of FY-2G IR2(Oct 15, 2015, UTC 03:00); (c) LSE of FY-2G IR1(Oct 15, 2015, UTC 14:00); (d) LSE of FY-2G IR2(Oct 15, 2015, UTC 14:00)

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Fig. 5. Difference between LSEs of FY-2G channels IR1 and IR2. (a) LSE difference at UTC 03:00 (daytime); (b) LSE difference at UTC 14:00 (nighttime)

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Fig. 6. Cross-comparison verification error of MOD11B1 LSE and FY-2G LSE.(a) Comparison of LSEs of MODIS channel 31 and FY-2G IR1 at UTC 03:00; (b)comparison of LSEs of MODIS channel 32 and FY-2G IR2 at UTC 03:00; (c) comparison of LSEs of MODIS channel 31 and FY-2G IR1 at UTC 14:00;(d) comparison of LSEs of MODIS channel 32 and FY-2G IR2 at UTC 14:00

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Fig. 7. Diurnal variation curves of average LSEs of FY-2G IR1 and IR2 and corresponding angle information. (a) Diurnal variation curves of average LSE of IR1 under six surface types; (b) diurnal variation curves of average LSE of IR2 under six surface types; (c) diurnal variation curves of average LSEs of IR1 and IR2 channels in China region; (d) difference between average LSEs of IR1 and IR2 channels under six surface types

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Fig. 8. Difference in land surface bidirectional reflectance

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Fig. 9. Difference in LSE of each channel. (a) Difference in LSE of channel IR4; (b) difference in LSE of channel IR1; (c) difference in LSE of channel IR2

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Table 1. Fitting results of FY-2G IR channels IR1, IR2, and IR4

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Table 1. Fitting results of FY-2G IR channels IR1, IR2, and IR4

FY-2G channel	m_i	n_i	SSE	R²	RMSE
IR1(10.3-11.3 μm)	4.859×10^-11	4.561	0.0671700	0.9998	0.014990
IR2(11.662-12.662 μm)	6.860×10^-10	4.081	0.0435800	0.9999	0.012070
IR4(3.5-4.0 μm)	4.565×10^-33	12.91	0.0009223	0.9998	0.001756

Table 2. Basic information of infrared channel parameters of FY-2G
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Table 2. Basic information of infrared channel parameters of FY-2G
Channel Band width /μm SNR@NE ΔT Resolution /km
IR1 10.3-11.3 0.2-0.4 K@300 K 5
IR2 11.662-12.662 0.2-0.4 K@300 K 5
IR3 6.3-7.6 0.3-0.6 K@260 K 5
IR4 3.5-4.0 0.3-0.6 K@300 K 5

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Lu Han, Shengcheng Cui, Shizhi Yang, Wenqiang Lu, Jianjun Shi, Qiang Zhao. Inversion of Land Surface Emissivity in China Based on FY-2G Infrared Satellite Data[J]. Acta Optica Sinica, 2019, 39(12): 1228003

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