Acta Optica Sinica, Volume. 41, Issue 18, 1828001(2021)
On-Orbit Radiometric Calibration Method for Satellites Based on TOA Reflectance at Baotou Site
Figures & Tables(14)
Fig. 1. Sand land target of Baotou site and automatic observation system. (a) Sentinel-2 scene of sand land target; (b) automatic observing system; (c) CE318 sun photometer
Fig. 2. TOA reflectance observed by Sentinel-2 over sand target from 2017 to 2020
Fig. 3. Atmospheric parameters at the time of Sentinel-2 satellite overpass Baotou site
Fig. 4. Flow chart of the satellite on-orbit radiometric calibration method based on TOA reflectance product over Baotou site
Fig. 5. TOA reflectance observed by Landsat-8 over Baotou site sand target from 2017 to 2020
Fig. 6. Model simulated TOA reflectance and Sentinel-2 observed TOA reflectance. (a)--(i) Band 1--band 8A, respectively
Fig. 7. Relative error between model simulated TOA reflectance and Sentinel-2 observed TOA reflectance
Fig. 8. Spectral response function of Sentinel-2. (a) Sentinel-2A; (b) Sentinel-2B
Fig. 10. Relative error between TOA reflectance products (with and without correction) and Sentinel-2 TOA reflectance
Table 1. Chosen spectral bands of Sentinel-2 sensor (S2A & S2B)
View tableTable 1. Chosen spectral bands of Sentinel-2 sensor (S2A & S2B)
Channel No. S2A S2B Spatial resolution /m Central wavelength λ /nm Bandwidth /nm Central wavelength λ /nm Bandwidth /nm B1 443.9 27 442.3 45 60 B2 496.6 98 492.1 98 10 B3 560.0 45 559.0 46 10 B4 664.5 38 665.0 39 10 B5 703.9 19 703.8 20 20 B6 740.2 18 739.1 18 20 B7 782.5 28 779.7 28 20 B8 835.1 145 833.0 133 10 B8A 864.8 33 864.0 32 20
Table 2. Fitting coefficient of empirical model of each band
View tableTable 2. Fitting coefficient of empirical model of each band
Channel No. Coefficient a b c B1 -0.0394 -1.34×10-4 0.2060 B2 -0.0225 -9.33×10-5 0.1860 B3 0.0027 -6.77×10-5 0.1919 B4 0.0050 -4.63×10-5 0.2527 B5 -0.0070 -3.52×10-5 0.2767 B6 0.0038 -5.52×10-5 0.2859 B7 0.0147 -6.54×10-5 0.2956 B8 -0.0006 -3.97×10-5 0.2989 B8A 0.0182 -6.71×10-5 0.3025
Table 3. Relative error statistic between model simulated TOA reflectance and Sentinel-2 observed TOA reflectance
View tableTable 3. Relative error statistic between model simulated TOA reflectance and Sentinel-2 observed TOA reflectance
Channel No. B1 B2 B3 B4 B5 B6 B7 B8 B8A Average relative error /% 0.81 0.76 -0.06 -0.31 0.17 0.42 -1.17 0.54 0.06 STD of relative error /% 2.95 2.62 1.46 1.44 1.88 1.43 1.55 1.59 1.38
Table 4. Relative error statistic between TOA reflectance products (with and without correction) and Sentinel-2 TOA reflectance
View tableTable 4. Relative error statistic between TOA reflectance products (with and without correction) and Sentinel-2 TOA reflectance
Channel No. B1 B2 B3 B4 B5 B6 B7 B8 B8A Average relative error /% without 4.80 0.78 1.96 2.78 4.66 4.34 6.13 4.00 5.68 with -0.55 -1.45 -0.06 -0.06 -0.04 -0.56 -0.84 -1.82 0.07 STD of relative error /% without 5.02 5.57 5.69 5.74 5.68 5.89 5.86 5.91 5.88 with 2.99 2.54 1.51 1.46 1.80 1.43 1.52 1.17 1.35
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Min Yang, Zhaoyan Liu, Yongguang Zhao, Lingling Ma, Wan Li, Ning Wang, Chuanrong Li, Lingli Tang. On-Orbit Radiometric Calibration Method for Satellites Based on TOA Reflectance at Baotou Site[J]. Acta Optica Sinica, 2021, 41(18): 1828001
Paper Information
Category: Remote Sensing and Sensors
Received: Mar. 9, 2021
Accepted: Apr. 7, 2021
Published Online: Sep. 6, 2021
The Author Email: Liu Zhaoyan (zyliu@aircas.ac.cn), Zhao Yongguang (zhaoyg@aircas.ac.cn), Ma Lingling (mall@aircas.ac.cn)
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