Analysis of Influence of Solar Zenith Angle on Reconstruction of Hyperspectral Surface Reflectance

Shenda Du; Yunjie Zhang; Wei Wei; Dong Huang; Xin Li; Xiaobing Zheng

doi:10.3788/AOS202141.0229001

Acta Optica Sinica, Volume. 41, Issue 2, 0229001(2021)

Analysis of Influence of Solar Zenith Angle on Reconstruction of Hyperspectral Surface Reflectance

Shenda Du^1,2,3, Yunjie Zhang^1,3、*, Wei Wei^1,3, Dong Huang^1,2,3, Xin Li^1,3, and Xiaobing Zheng^1,3

¹Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031, China

²University of Science and Technology of China, Hefei, Anhui 230026, China

³Key Laboratory of Optical Calibration and Characterization, Chinese Academy of Sciences, Hefei, Anhui 230031, China

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Figures & Tables(10)

Fig. 1. Flow chart of reflectance calculation

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Fig. 2. Calculation method of similarity

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Fig. 3. Reflectance at different zenith angles in 2019. (a) 30°; (b) 40°; (c) 50°; (d) 60°; (e) 70°; (f) 80°

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Fig. 4. Statistical parameters of zenith angle in 6 categories. (a) $\hat{δ}$ ; (b) outlier ratio; (c) $\hat{μ}$ and

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Fig. 5. Statistical results of similarity. (a) Single case; (b) combined case

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Fig. 6. Variation of model parameters at different wavelengths

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Fig. 7. Similarity statistical curves before and after correction under different conditions. (a) 30° and 80° ; (b) 80°

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Table 1. Key parameters of automated instruments
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Table 1. Key parameters of automated instruments
Parameter ATR PSR
Center wavelength /nm 400, 450, 500, 600, 675, 810, 1000, 1550 365, 412, 500, 610, 675, 862, 940, 1025
Band width /nm 10 20--40

Table 2. Similarity statistics

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Table 2. Similarity statistics

Zenith angle	30°	40°	50°	60°	70°	80°	30°&40°	30°&80°
Mean	0.9947	0.9942	0.9946	0.9940	0.9931	0.9915	0.9944	0.9898
Standard deviation	0.0041	0.0043	0.0042	0.0044	0.0048	0.0063	0.0042	0.0071
Minimum	0.9708	0.9633	0.9638	0.9605	0.9572	0.9464	0.9633	0.9464

Table 3. Similarity statistics before and after correction
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Table 3. Similarity statistics before and after correction
Zenith angle 30° 80° 30°(80°) 30°&80° 30°&30°(80°)
Mean 0.9947 0.9915 0.9918 0.9898 0.9901
Standard deviation 0.0041 0.0063 0.0060 0.0071 0.0068
Minimum 0.9708 0.9464 0.9494 0.9464 0.9494

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Shenda Du, Yunjie Zhang, Wei Wei, Dong Huang, Xin Li, Xiaobing Zheng. Analysis of Influence of Solar Zenith Angle on Reconstruction of Hyperspectral Surface Reflectance[J]. Acta Optica Sinica, 2021, 41(2): 0229001

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