Transfer method to calibrate the normalized radiance for a CE318 Sun/sky radiometer

Kaitao Li; Zhengqiang Li; Donghui Li; Wei Li; Luc Blarel; Philippe Goloub; Torres Benjamin; Hua Xu; Yisong Xie; Weizhen Hou; Li Li; Xingfeng Chen

doi:10.3788/COL201513.041001

Chinese Optics Letters, Volume. 13, Issue 4, 041001(2015)

Transfer method to calibrate the normalized radiance for a CE318 Sun/sky radiometer

Kaitao Li^1,2, Zhengqiang Li^1、*, Donghui Li¹, Wei Li³, Luc Blarel⁴, Philippe Goloub⁴, Torres Benjamin⁴, Hua Xu¹, Yisong Xie¹, Weizhen Hou¹, Li Li¹, and Xingfeng Chen¹

Author Affiliations

¹State Environmental Protection Key Laboratory of Satellite Remote Sensing, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China

²University of Chinese Academy of Sciences, Beijing 100049, China

³Hefei University of Technology, Hefei 230009, China

⁴University of Lille 1, Lille 59655, France

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Figures & Tables(6)

Fig. 1. Matrix measurements of radiometer #350. The left one shows the 3D surface map of the raw measurements taken in Beijing on August 20, 2014 at 03:00:00 (UTC), while the right one shows the plane map of the measurements.

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Fig. 2. Comparison of one year’s averaged inversion residuals (difference between the fitted and measured normalized radiance) corresponding to the AERONET calibrations and the transfer method in ALM geometry; R¯ denotes the averaged residual of the inversion.

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Fig. 3. Comparison of retrievals corresponding to the AERONET calibrations and the transfer method in ALM geometry. The vertical lines mean the min and max values of the retrievals.

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Table 1. Calibration Coefficients of Radiometer #350 on November 2, 2009 and October 28, 2009

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Table 1. Calibration Coefficients of Radiometer #350 on November 2, 2009 and October 28, 2009

WV (nm)	1020	1640	870	675	440	500
$V_{0}$	9885.2	11303.8	26820.2	18751.1	10868.4	14905.4
$C_{a}$ ( $W / m^{2} / sr / nm / DN$ )	0.01802	0.00247	0.01708	0.01954	0.03956	0.03104
$C_{k}$ ( $W / m^{2} / sr / nm / DN$ )	0.00225	0.00031	0.00427	0.00488	0.00988	0.00776
$E_{0}$ ( $W / m^{2} / nm$ )	0.70776	0.23273	0.95432	1.51577	1.84143	1.92228

Table 2. Average Differences in Normalized Radiance L′ Based on AERONET Calibration Between Double 6° Sky Measurements for Radiometer #350 in the Year 2010
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Table 2. Average Differences in Normalized Radiance L′ Based on AERONET Calibration Between Double 6° Sky Measurements for Radiometer #350 in the Year 2010
WV (nm) 1020 1640 870 675 440 500
Diff. in SPP $L^{'}$ (%) 0.32 0.28 0.19 0.27 0.15 0.18
Diff. in ALM $L^{'}$ (%) 0.52 0.50 0.54 0.57 0.21 0.55

Table 3. Uncertainties Estimated on the Normalized Radiance Based on the Transfer Method
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Table 3. Uncertainties Estimated on the Normalized Radiance Based on the Transfer Method
Error sources Uncertainties (%)
$Δ Ω_{v} / Ω_{v}$ 1.5
$Δ (\frac{LG}{{HG}_{a}}) / \frac{LG}{{HG}_{a}}$ 0.5
$Δ V_{0} / V_{0}$ (master, field) 0.5, 1.5
$Δ V_{a} / V_{a}$ 0.5
Others 0.5
Total 2.0 (master)/2.4(field)

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Kaitao Li, Zhengqiang Li, Donghui Li, Wei Li, Luc Blarel, Philippe Goloub, Torres Benjamin, Hua Xu, Yisong Xie, Weizhen Hou, Li Li, Xingfeng Chen. Transfer method to calibrate the normalized radiance for a CE318 Sun/sky radiometer[J]. Chinese Optics Letters, 2015, 13(4): 041001

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Paper Information

Category: Image processing

Received: Dec. 22, 2014

Accepted: Feb. 12, 2015

Published Online: Sep. 21, 2018

The Author Email: Zhengqiang Li (lizq@radi.ac.cn)

DOI:10.3788/COL201513.041001

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Calibration Coefficients of Radiometer #350 on November 2, 2009 and October 28, 2009

Table 1. Calibration Coefficients of Radiometer #350 on November 2, 2009 and October 28, 2009

Table 2. Average Differences in Normalized Radiance L′ Based on AERONET Calibration Between Double 6° Sky Measurements for Radiometer #350 in the Year 2010

Table 2. Average Differences in Normalized Radiance L′ Based on AERONET Calibration Between Double 6° Sky Measurements for Radiometer #350 in the Year 2010

Table 3. Uncertainties Estimated on the Normalized Radiance Based on the Transfer Method

Table 3. Uncertainties Estimated on the Normalized Radiance Based on the Transfer Method