光学学报, 2019, 39 (7): 0728004, 网络出版: 2019-07-16 复制并引用该论文  本文已被引 2 次  被引通知

图 & 表

图 1. 通道式反射率光谱拓展流程

Fig. 1. Flow of spectral reconstruction for multispectral reflectance

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图 2. 包头场自动观测系统。(a)定标场人工靶标区总览;(b)通道式辐射计;(c)太阳光度计CE318

Fig. 2. Automatic observation system of the Baotou calibration site. (a) Overview of artificial targets in calibration site; (b) multispectral radiometer; (c) sunphotometer CE318

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图 3. 通道式辐射计光谱响应函数曲线

Fig. 3. Spectral response function of multispectral radiometer

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图 4. 光谱拓展结果。(a) 2018-10-30T11:00; (b) 2018-10-30T12:00; (c) 2018-10-30T13:00; (d) 2018-10-30T14:00

Fig. 4. Results of hyperspectral reflectance determination. (a) 2018-10-30T11:00; (b) 2018-10-30T12:00; (c) 2018-10-30T13:00; (d) 2018-10-30T14:00

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图 5. 通道式辐射计测量光谱拓展结果与SVC实测数据差异

Fig. 5. Difference between reconstructed hyperspectral reflectance and measured reflectance of SVC

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图 6. Sentinel-2过境时刻影像数据。(a) Sentinel-2B (2018-09-21, RAOT@550 nm=0.20, RWVC=0.39); (b) Sentinel-2A (2018-10-29, RAOT@550 nm=0.07, RWVC=0.56)

Fig. 6. Acquired Sentinel-2 images. (a) Sentinel-2B (2018-09-21, RAOT@550 nm=0.20, RWVC=0.39); (b) Sentinel-2A (2018-10-29, RAOT@550 nm=0.07, RWVC=0.56)

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图 7. Sentinel-2通道光谱响应函数曲线。(a) Sentinel-2A; (b) Sentinel-2B

Fig. 7. Spectral response function of Sentinel-2. (a) Sentinel-2A; (b) Sentinel-2B

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表 1通道式辐射计的滤光片参数

Table1. Filter parameters of multispectral radiometer

Channel No. Central wavelengthλ /nm FWHM Bλ /nm Transmissionτλ /% 1 439.72 10.48 ≥37 2 499.79 10.27 ≥50 3 679.77 10.13 ≥50 4 869.60 10.96 ≥50 5 1015.50 9.44 ≥40 6 1298.63 11.05 ≥40 7 1549.25 10.87 ≥50 8 1649.23 12.52 ≥50

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表 2光谱拓展精度示例(10月30日)

Table2. Accuracy of hyperspectral reflectance determination (October 30th)

Time Average relative error /% RMSE 11:00 -0.989 0.005 12:00 -0.755 0.005 13:00 -0.911 0.005 14:00 -0.889 0.003

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表 3基于光谱拓展的Sentinel-2定标对比分析

Table3. Comparison of onboard observed and predicted at-sensor radiance of Sentinel-2 based on the reconstructed hyperspectral reflectance

Image Band Observed radiance /(W·m-2·sr-1·μm-1) Spectral reconstruction results Simulated radiance /(W·m-2·sr-1·μm-1) Relative error /% Considering BRDF Without considering BRDF Considering BRDF Without considering BRDF Sentinel-2B2018-09-21 Blue 82.51 85.17 86.03 -3.12 -4.09 Green 78.12 77.64 78.47 0.62 -0.45 Red 70.87 67.13 68.12 5.56 4.04 NIR 50.95 46.66 47.06 9.19 8.27 Sentinel-2A2018-10-29 Blue 60.52 62.18 62.94 -2.66 -3.84 Green 56.37 56.08 56.71 0.52 -0.60 Red 52.19 49.65 50.25 5.12 3.86 NIR 36.89 33.55 33.83 9.94 9.05

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表 4地面光谱拓展结果的不确定因素及其不确定度

Table4. Uncertainty factors and uncertainty of ground spectral extension results

Influencing factor Uncertainty /% Calibration error of multispectral radiometer 2.00 Downward irradiance due to AOT error 0.24 Downward irradiance due to WVC error 0.09 Solar irradiance model 1.00 MODTRAN model 2.00 BRDF model 1.42 Reconstruction coefficient 0.23

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表 5基于光谱拓展的Sentinel-2卫星辐射定标验证不确定度分析

Table5. Uncertainty analysis of Sentinel-2 radiometric calibration based on the reconstructed hyperspectral reflectance

Uncertainty contributor Uncertainty /% Uncertainty of simulated TOA radiance /% Blue Green Red NIR Reconstructed hyperspectral reflectance of target 3.34 2.12 2.57 2.90 3.09 Surface homogeneity 1.39 0.90 1.09 1.23 1.31 Surface BRDF characteristic 1.50 0.95 1.16 1.30 1.39 AOT 5.50 0.17 0.32 0.39 0.37 WVC 10.00 0.01 0.01 0.03 0.23 MODTRAN model 2.00 2.00 2.00 2.00 2.00 Solar irradiance model 1.00 1.00 1.00 1.00 1.00 Overall uncertainty 3.35 3.77 4.10 4.29

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马志宏, 马灵玲, 刘耀开, 赵永光, 王宁, 李传荣, 唐伶俐. 通道式辐射计自动观测数据的反射率光谱拓展方法[J]. 光学学报, 2019, 39(7): 0728004. Zhihong Ma, Lingling Ma, Yaokai Liu, Yongguang Zhao, Ning Wang, Chuanrong Li, Lingli Tang. A Method for Hyperspectral Reflectance Reconstruction from Automatic Observation with Multispectral Radiometer[J]. Acta Optica Sinica, 2019, 39(7): 0728004.