Comparative Analysis of BPDF Land Surface Models Based on DPC Measurements of Gaofen-5 Satellite and Data of AERONET Sites

Rufang Ti; Yizhe Fan; Honglian Huang; Xiao Liu; Xiaobing Sun; Jin Hong; Shufen Liu

doi:10.3788/AOS202242.1828003

Acta Optica Sinica, Volume. 42, Issue 18, 1828003(2022)

Comparative Analysis of BPDF Land Surface Models Based on DPC Measurements of Gaofen-5 Satellite and Data of AERONET Sites

Rufang Ti^1、*, Yizhe Fan^1,2, Honglian Huang^1,3, Xiao Liu^1,3, Xiaobing Sun^1,3、**, Jin Hong¹, and Shufen Liu⁴

Author Affiliations

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

²University of Science and Technology of China, Hefei 230026, Anhui, China

³Hefei Chief Expert Studio of Agricultural Industry, Hefei 230031, Anhui, China

⁴Shandong Tai′an Ecological Environment Monitoring Center, Tai′an271018, Shandong, China

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Figures & Tables(9)

Fig. 1. Imaging system and multi-angle detection diagram

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Fig. 2. Data processing flow

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Fig. 3. Polarized reflectance plotted with scattering angle obtained by eight typical IGBP classifications

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Fig. 4. Polar plots of polarized reflectance data (×100) over seven days (perhaps discontinuous) at 865 nm for eight AERONET sites corresponding to eight typical IGBP types

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Fig. 5. Measured and simulated scattering dots of polarized reflectance for eight typical IGBP types

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Table 1. DPC instrumental parameters

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Table 1. DPC instrumental parameters

Parameter	Value
Spectral band /nm	443，490（P），565，670（P），763，765，865（P），910
Band width /nm	20，20，20，20，10，40，40，20
Angle of polarization /（°）	0（P），60（P），120
FOV /（°）	-50-50
Number of multi-angles	9（along the orbit）
Spatial resolution /km	3.29（subsatellite point）
Orbit type	Sun synchronous orbit
Orbit altitude /km	705
Local time of ascending node	13：30
Radiative calibration error /%	≤5
Polarization calibration error	≤0.02

Table 2. AERONET sites and DPC data statistics

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Table 2. AERONET sites and DPC data statistics

IGBP	Classification	Site number	DPC data number	DPC observation
4	Deciduous broadleaf forest	5	56	500
7	Open shrublands	8	236	2118
8	Woody savannas	5	41	357
9	Savannas	7	109	974
10	Grasslands	32	408	3638
12	Croplands	10	145	1287
13	Urban and built-up	66	1259	11028
16	Barren or sparse vegetation	14	334	29225

Table 3. Performance statistic results of five BPDF models

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Table 3. Performance statistic results of five BPDF models

IGBP	Nadal-Bréon		Maignan		Waquet		Litvinov		Xie-Cheng
IGBP	C_cor	100E_RMS	C_cor	100E_RMS	C_cor	100E_RMS	C_cor	100E_RMS	C_cor	100E_RMS
Average	0.952	0.223	0.901	0.339	0.905	0.360	0.958	0.202	0.919	0.303
4	0.947	0.228	0.919	0.306	0.920	0.349	0.961	0.190	0.931	0.290
7	0.980	0.156	0.972	0.193	0.948	0.323	0.981	0.140	0.971	0.203
8	0.940	0.200	0.845	0.345	0.837	0.398	0.949	0.188	0.863	0.327
9	0.947	0.184	0.882	0.290	0.927	0.248	0.959	0.154	0.938	0.208
10	0.944	0.228	0.893	0.327	0.916	0.325	0.956	0.198	0.923	0.282
12	0.957	0.212	0.909	0.363	0.874	0.411	0.957	0.207	0.887	0.377
13	0.955	0.246	0.871	0.472	0.908	0.397	0.960	0.227	0.920	0.353
16	0.942	0.327	0.918	0.418	0.907	0.432	0.943	0.311	0.922	0.385

Table 4. BPDF model parameters based on DPC data

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Table 4. BPDF model parameters based on DPC data

IGBP	Nadal-Bréon		Waquet		Maignan	Litvinov			Xie-Cheng
IGBP	100α	β	ξ	σ	α	α	σ²	κλ	A	κ_r
4	1.975	58.645	0.432	0.040	8.616	4.169	0.713	0.651	0.999	0.530
7	2.250	64.928	0.507	0.049	7.699	4.773	0.649	0.657	0.967	0.554
8	1.629	69.543	0.445	0.058	8.256	3.746	0.491	0.678	0.968	0.556
9	1.939	61.664	0.485	0.061	9.342	4.221	0.536	0.683	0.992	0.537
10	1.904	72.559	0.519	0.055	8.188	4.516	0.550	0.722	0.996	0.523
12	2.058	71.361	0.532	0.061	9.613	4.722	0.620	0.710	1.000	0.507
13	2.564	57.604	0.588	0.055	9.081	4.452	0.558	0.652	0.999	0.468
16	3.100	52.578	0.691	0.055	8.916	5.486	0.612	0.618	0.987	0.424

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Rufang Ti, Yizhe Fan, Honglian Huang, Xiao Liu, Xiaobing Sun, Jin Hong, Shufen Liu. Comparative Analysis of BPDF Land Surface Models Based on DPC Measurements of Gaofen-5 Satellite and Data of AERONET Sites[J]. Acta Optica Sinica, 2022, 42(18): 1828003

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Paper Information

Category: Remote Sensing and Sensors

Received: Jan. 13, 2022

Accepted: Mar. 1, 2022

Published Online: Sep. 15, 2022

The Author Email: Ti Rufang (tirufang@aiofm.ac.cn), Sun Xiaobing (xbsun@aiofm.ac.cn)

DOI:10.3788/AOS202242.1828003

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