Ocean Sites Calibration and Water Color Retrieval for Directional Polarimetric Camera

Yuwei Pan; Jingjing Chen; Liang Sun; Pengfei Zhang; Feinan Chen; Binghuan Meng; Guangfeng Xiang; Jin Hong

doi:10.3788/AOS231924

Acta Optica Sinica, Volume. 44, Issue 18, 1801008(2024)

Ocean Sites Calibration and Water Color Retrieval for Directional Polarimetric Camera

Yuwei Pan^1,2, Jingjing Chen¹, Liang Sun^2、*, Pengfei Zhang³, Feinan Chen², Binghuan Meng², Guangfeng Xiang², and Jin Hong²

Author Affiliations

¹School of Instrument Science and Opto-electronics Engineering, Hefei University of Technology, Hefei 230009, Anhui , China

²Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Auhui, China

³Shanghai Institute of Satellite Engineering, Shanghai 200240, China

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Figures & Tables(18)

Fig. 1. DPC remote sensing image of ROI

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Fig. 2. Flowchart of Chl-a retrievel complete process

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Fig. 3. Scatter plots of radiation calibration results for each band. (a) 443 nm band; (b) 490 nm band; (c) 565 nm band; (d) 670 nm band

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Fig. 4. Comparison chart of radiometric calibration results for three scenes

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Fig. 5. Comparison of results before and after 6S atmospheric correction. (a) TOA reflectance measured by DPC; (b) comparison of atmospherically corrected surface reflectance and MODIS surface reflectance plot

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Fig. 6. Comparison of Chl-a mass concentrations measured by MODIS and Chl-a mass concentration retrieved before and after calibration. (a) Before calibration; (b) after calibration

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Fig. 7. Spatial distributions of Chl-a mass concentrations. (a) Chl-a mass concentration measured by MODIS; (b) Chl-a mass concentration retrieved by the OC3 algorithm before calibration; (c) Chl-a mass concentration retrieved by the OC3 algorithm after calibration

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Fig. 8. Histogram of the overall difference between Chl-a mass concentration measuerd by MODIS and Chl-a mass concentrations retrieved by the OC3 algorithm before and after calibration

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Fig. 9. Frequency distribution plots of Chl-a mass concentration measured by MODIS and Chl-a mass concentrations retrieved by the OC3 algorithm before and after calibration. (a) Chl-a mass concentration<1 mg/m³; (b) Chl-a mass concentrations≥1 mg/m³

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Table 1. Latitude and longitude of ocean calibration sites

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Table 1. Latitude and longitude of ocean calibration sites

Site name	Latitude	Longitude
AltS	9.9°S-19.9°S	11.0°W-32.3°W
PacSE	20.7°S-44.9°S	89.0°W-130.2°W
PacNW	10.0°N-22.7°N	139.5°E-165.6°E
AltN	17.0°N-27.0°N	44.2°W-62.5°W
IndS	21.2°S-29.9°S	89.5°E-100.1°E
PacN	15.0°N-23.5°N	160.0°W-179.0°W

Table 2. Band specification of the DPC
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Table 2. Band specification of the DPC
Band number Band center /nm Bandwidth /nm Polarzation
1 443 20 No
2 490 20 Yes
3 565 20 No
4 670 20 Yes
5 763 10 No
6 765 40 No
7 865 40 Yes
8 910 20 No

Table 3. Descriptive statistics of Chl-a mass concentration measured by MODIS
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Table 3. Descriptive statistics of Chl-a mass concentration measured by MODIS
Parameter Min Max Mean Median
Chl-a mass concentration /（mg/m³） 0.0835 3.6470 0.1945 0.1773

Table 4. LUT input parameter setting

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Table 4. LUT input parameter setting

Parameter	Value
Solar zenith angle /(°)	0-80, step 5
View zenith angle /(°)	0-80, step 5
Relative azimuth angle /(°)	0-180, step 5
Atmospheric model	Water vapor is 2.5 g/cm²
Aerosol model	Maritime
Aerosol optical depth	10^-6, 0.005, 0.01, 0.05, 0.1, 0.15, 0.20, 0.25, 0.5, 1.0
Chl-a mass concentration /(mg/m³)	10^-6, 0.01, 0.03, 0.07, 0.1, 0.3, 0.5
Month	8
Day	22

Table 5. Statistical analysis table of calibration results for each band
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Table 5. Statistical analysis table of calibration results for each band
Band /nm A_Ocean MAE RMSE R²
443 1.0893 0.0196 0.0201 0.9812
490 1.0246 0.0086 0.0092 0.9823
565 0.9784 0.0014 0.0016 0.9914
670 1.0089 0.0005 0.0006 0.9867

Table 6. Statistical analysis table of calibration results for ice and snow scene
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Table 6. Statistical analysis table of calibration results for ice and snow scene
Band /nm A_Snow Deviation /%
443 1.0825 0.68
490 1.0250 -0.04
565 0.9686 0.98
670 1.0054 0.30

Table 7. Statistical analysis table of calibration results for desert scene
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Table 7. Statistical analysis table of calibration results for desert scene
Band /nm A_Desert Deviation /%
443 1.0708 1.85
490 1.0283 -0.37
565 0.9891 -1.07
670 1.0152 -0.63

Table 8. Statistical table of results before and after 6S atmospheric calibration
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Table 8. Statistical table of results before and after 6S atmospheric calibration
Band /nm DPC TOA reflectance DPC surface reflectance MODIS surface reflectance RE /%
443 0.1900 0.0242 0.0229 5.68
490 0.1341 0.0208 0.0182 14.28
565 0.0672 0.0110 0.0097 13.40
670 0.0365 0.0052 0.0017 20.59

Table 9. Accuracy assessment of the algorithms before and after calibration
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Table 9. Accuracy assessment of the algorithms before and after calibration
Calibration Algorithm Slope Intercept MAE RMSE R²
Before calibration OC3 0.7230 0.0235 0.0457 0.0626 0.7516
After calibration OC3 0.8460 0.0073 0.0432 0.0578 0.7720

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Yuwei Pan, Jingjing Chen, Liang Sun, Pengfei Zhang, Feinan Chen, Binghuan Meng, Guangfeng Xiang, Jin Hong. Ocean Sites Calibration and Water Color Retrieval for Directional Polarimetric Camera[J]. Acta Optica Sinica, 2024, 44(18): 1801008

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