Influence and Correction of BRDF Retrieval of Surface by Atmospheric Scattering

Chuan Chen; Weining Yi; Wenyu Cui; Honglian Huang

doi:10.3788/AOS201838.0729001

Acta Optica Sinica, Volume. 38, Issue 7, 0729001(2018)

Influence and Correction of BRDF Retrieval of Surface by Atmospheric Scattering

Chuan Chen^1,2, Weining Yi¹, Wenyu Cui^1、*, and Honglian Huang¹

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

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

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Figures & Tables(12)

Fig. 1. Distributions of atmospheric scattered radiation under different weather conditions in hemisphere. (a) XVIS=23 km; (b) XVIS=15 km; (c) XVIS=5 km; (d) cloudy

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Fig. 2. Distribution of BRF calculated by Roujean

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Fig. 3. Distributions of simulated BRF under different weather conditions. (a) XVIS=23 km; (b) XVIS=15 km; (c) XVIS=5 km; (d) cloudy

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Fig. 4. Simulated BRF in solar principal plane

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Fig. 5. Distributions of measured atmospheric scattered radiation. (a) Cloudy; (b) sunny

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Fig. 6. Distributions of measured BRF. (a) Cloudy; (b) sunny

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Fig. 7. Comparison betweenactual measured BRF at night and BRF calculated by different parameters

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Table 1. Solar irradiation simulated by MODTRAN
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Table 1. Solar irradiation simulated by MODTRAN
Weather condition X_VIS /km Solar irradiation /(W·cm^-2)
Sunny 23 3.856×10^-2
Sunny 15 2.727×10^-2
Sunny 5 1.934×10^-2
Cloudy 0

Table 2. Magnitude of directional reflectance characteristic of the BRF results
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Table 2. Magnitude of directional reflectance characteristic of the BRF results
Weather condition X_VIS /km Variance
Theoretical condition 14.170
Sunny 23 12.665
Sunny 15 10.266
Sunny 5 4.470
Cloudy 1.685

Table 3. Retrieved BRDF parameters based on simulated BRF

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Table 3. Retrieved BRDF parameters based on simulated BRF

Weather condition	X_VIS/km	Classical method			Proposed method
Weather condition	X_VIS/km	k₀	k₁	k₂	k₀	k₁	k₂
Sunny	23	8.608	1.566	8.390	8.690	1.655	8.563
Sunny	15	8.467	1.407	7.240	8.690	1.655	8.563
Sunny	5	8.360	1.256	7.059	8.690	1.655	8.563
Cloudy		7.615	0.452	0.469	8.690	1.655	8.563

Table 4. Retrieved BRDF parameters based on measured BRF
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Table 4. Retrieved BRDF parameters based on measured BRF
Weather condition Classical method Proposed method
k₀ k₁ k₂ k₀ k₁ k₂
Cloudy 7.547 0.711 5.524 8.379 1.270 17.911
Sunny 8.347 1.354 19.984 8.833 1.487 20.422

Table 5. Comparison of the retrieval precision between the classical and proposed methods under different weather conditions%
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Table 5. Comparison of the retrieval precision between the classical and proposed methods under different weather conditions%
Weather condition Classical method Proposed method
Cloudy 25.70 9.71
Sunny 9.53 6.21

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Chuan Chen, Weining Yi, Wenyu Cui, Honglian Huang. Influence and Correction of BRDF Retrieval of Surface by Atmospheric Scattering[J]. Acta Optica Sinica, 2018, 38(7): 0729001

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