Autonomous vicarious calibration based on automated test-site radiometer

刚刚 邱; 新 李; 小兵 郑; 静 闫; 彦港 孙

doi:10.3788/COL201614.121201

Journals >Chinese Optics Letters >Volume 14 >Issue 12 >Page 121201 > Article

Chinese Optics Letters
Vol. 14, Issue 12, 121201 (2016)

Autonomous vicarious calibration based on automated test-site radiometer

刚刚邱^1、2, 新李^1、*, 小兵郑^1、**, 静闫¹, and 彦港孙³

Author Affiliations

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

²University of Sciences and Technology of China, Hefei 230031, China

³Shanghai Maritime University, Shanghai 201306, China

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DOI: 10.3788/COL201614.121201 Cite this Article Set citation alerts

刚刚邱, 新李, 小兵郑, 静闫, 彦港孙. Autonomous vicarious calibration based on automated test-site radiometer[J]. Chinese Optics Letters, 2016, 14(12): 121201 Copy Citation Text

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Fig. 1. AVCS. (a) ATR, (b) Cimel sunphotometer, and (c) automated diffuser-to-globe irradiance meter.

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(a) The reflectance curves in the central area of CRCS (10 km×10 km) from an analytical spectral device (ASD) field spectrometer at August 13–22, 2015. (b) The relative root mean square (RMS) deviation of the surface reflectance at the central area is in a range that is less than 2% than 350–500 nm and less than 1% from 500–2500 nm. (c) The reflectance curves of 11 measured points, from the SVC, in the 200 m×200 m square area near the ATR on August 19, 2015. (d) The RMS deviation of reflectance is less than 3.4% within the whole band.

Fig. 2. (a) The reflectance curves in the central area of CRCS (10 km×10 km) from an analytical spectral device (ASD) field spectrometer at August 13–22, 2015. (b) The relative root mean square (RMS) deviation of the surface reflectance at the central area is in a range that is less than 2% than 350–500 nm and less than 1% from 500–2500 nm. (c) The reflectance curves of 11 measured points, from the SVC, in the 200 m×200 m square area near the ATR on August 19, 2015. (d) The RMS deviation of reflectance is less than 3.4% within the whole band.

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Fig. 3. Surface reflectance versus wavelength for Dunhuang Gobi on August 19, 2015 and the NSR of the ATR and MODIS. The surface reflectance was obtained by personnel using an SVC. A standard panel is used as a reflectance standard during this measurement.

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AQUA/MODIS	Predicted radiance ( $W \cdot {(m^{2} \cdot sr \cdot μ m)}^{- 1}$ )	MODIS radiance ( $W \cdot {(m^{2} \cdot sr \cdot μ m)}^{- 1}$ )	Percent difference (%)
Band 1	99.137	98.330	0.819
Band 2	65.804	65.107	1.071
Band 3	107.867	108.577	−0.653
Band 4	102.444	103.013	−0.552

Table 1. Calibration Results by Traditional Approach

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Parameter	Aqua	Terra
Overpass time (Beijing)	14:36	12:57
Viewing zenith (deg.)	25.35	27.88
Viewing azimuth (deg.)	77.03	283.39
Solar zenith (deg.)	30.05	29.87
Solar azimuth (deg.)	205.30	155.61
Water column ( $grams / {cm}^{2}$ )	0.9768	0.9768
Ozone column (Dobson units)	297	297
AOD550	0.2269	0.2297
Day of year	233	233
Earth-sun distance (A.U.)	0.95438	0.95438
Air temperature (°C)	30.0	31.3
Relative humidity (%)	10.2	9.1
Pressure (mBar)	870.2	869.0