In-Flight Radiation Calibration of a Directional Polarimetric Camera at Visible Bands Onboard GF-5

Feinan Chen; Yizhe Fan; Jin Hong; Chan Huang; Shuang Li; Benyong Yang; Bihai Tu; Lin Han; Bin Sun

doi:10.3788/AOS202040.2328001

Acta Optica Sinica, Volume. 40, Issue 23, 2328001(2020)

In-Flight Radiation Calibration of a Directional Polarimetric Camera at Visible Bands Onboard GF-5

Feinan Chen^1,3, Yizhe Fan^1,2,3, Jin Hong^1,3、*, Chan Huang^1,2,3, Shuang Li^1,3, Benyong Yang^1,3, Bihai Tu^1,3, Lin Han^1,3, and Bin Sun^1,3

Author Affiliations

¹Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China

²University of Science and Technology of China, Hefei, Anhui 230031, China

³Key Laboratory of Optical Calibration and Characterization, Chinese Academy of Sciences, Hefei, Anhui 230031, China

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Figures & Tables(16)

Fig. 1. Location of AltS site on Google Earth

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Fig. 2. Statistics of sea water impurity content. (a) Global monthly distribution of seawater salinity;(b) statistical histogram of salinity of AltS site;(c) global monthly distribution of seawater chlorophyll content; (d) statistical histogram of chlorophyll content of AltS site

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Fig. 3. Statistical results of atmosphere parameters of AltS site on May 27, 2018. (a) Wind vector rose statistical diagram; (b) ozone content statistical histogram; (c) water vapor content statistical histogram

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Fig. 4. Simulation results. (a) Variations of components' reflectances vary with relative azimuth angle in the case of fixed solar zenith angle and view zenith angle;(b) variations of components' reflectances vary with view zenith angle in the case of fixed solar zenith angle and relative azimuth angle

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Fig. 5. Flow chart of in-flight radiation calibration

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Fig. 6. Imaging data of AltS site of DPC on May 27, 2018. (a) Real color band fusion image; (b) cloud mask image

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Fig. 7. Distribution of AOT550 at AltS site on May 27, 2018. (a) Distribution of AOT550 of MODIS at AltS site; (b) histogram of AOT550 difference between MODIS and DPC

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Fig. 8. Spectral response functions of DPC at visible bands

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Fig. 9. Statistical results of in-flight radiation calibration. (a) Band 443 nm; (b) band 490 nm; (c) band 565 nm; (d) band 670 nm

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Fig. 10. TOA reflectance difference induced by the deviation of wind speed and wind azimuth. (a) TOA reflectance difference induced by the deviation of wind speed difference of 1 m/s; (b) TOA reflectance difference induced by the deviation of wind azimuth difference of 30°

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Fig. 11. TOA reflectance difference induced by the deviation of chlorophyll content

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Fig. 12. TOA reflectance difference induced by the deviation of AOT550 data

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Fig. 13. TOA reflectance difference induced by the deviation of water vapor concentration

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Table 1. Band parameters and missions of DPC

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Table 1. Band parameters and missions of DPC

Band /nm	Parameter			Mission
Band /nm	Polarization	Central wavelength /nm	Band width /nm	Mission
443	No	443.3	20	Ocean and aerosol
490	Yes	488.9	20	Ocean
565	No	564.7	20	Ocean
670	Yes	668.8	20	Vegetation and aerosol
763	No	761.4	10	Cloud
765	No	763.1	40	Aerosol and cloud
865	Yes	861.8	40	Vegetation and aerosol
910	No	907.1	20	Water content

Table 2. Error analysis of the source of in-flight calibration of DPC at visible wavelength bands
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Table 2. Error analysis of the source of in-flight calibration of DPC at visible wavelength bands
Band /nm Δρ_ws /10^-4 Δρ_wa /10^-5 Δρ_chrl /10^-4 Δρ_aot /10^-3 Δ $ρ_{H_{2} O}$ /10^-6 Δρ_total /10^-3
443 2.5 4.0 25 1 0 2.70
490 3.0 3.0 2.0 1 0 1.06
565 3.0 1.5 5.0 1 100 1.16
670 4.0 1.5 1.0 1 10 1.19

Table 3. Error budget of in-flight calibration of DPC at visible wavelength bands
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Table 3. Error budget of in-flight calibration of DPC at visible wavelength bands
Band /nm $\bar{ρ}$ $\frac{Δ ρ_{total}}{\bar{ρ}}$ /% $\frac{Δ T}{T}$ /% $\frac{Δ P}{P}$ /% σ(ΔA) /%
443 0.130 2.08 0.20 0.30 2.10
490 0.090 1.18 0.20 0.30 1.24
565 0.046 2.52 0.20 0.30 2.53
670 0.025 4.75 0.20 0.30 4.76

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Feinan Chen, Yizhe Fan, Jin Hong, Chan Huang, Shuang Li, Benyong Yang, Bihai Tu, Lin Han, Bin Sun. In-Flight Radiation Calibration of a Directional Polarimetric Camera at Visible Bands Onboard GF-5[J]. Acta Optica Sinica, 2020, 40(23): 2328001

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Paper Information

Category: Remote Sensing and Sensors

Received: Jun. 24, 2020

Accepted: Aug. 14, 2020

Published Online: Nov. 23, 2020

The Author Email: Hong Jin (hongjin@aiofm.ac.cn)

DOI:10.3788/AOS202040.2328001

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Band parameters and missions of DPC

Table 1. Band parameters and missions of DPC

Table 2. Error analysis of the source of in-flight calibration of DPC at visible wavelength bands

Table 2. Error analysis of the source of in-flight calibration of DPC at visible wavelength bands

Table 3. Error budget of in-flight calibration of DPC at visible wavelength bands

Table 3. Error budget of in-flight calibration of DPC at visible wavelength bands