Analysis and Accuracy Evaluation of Scattering Characteristics of GF-3 Full-Polarized SAR

Li Jiahui; Wang Xiaochen

doi:10.3788/CJL202047.0310002

Chinese Journal of Lasers, Volume. 47, Issue 3, 310002(2020)

Analysis and Accuracy Evaluation of Scattering Characteristics of GF-3 Full-Polarized SAR

Li Jiahui¹ and Wang Xiaochen^2、*

Author Affiliations

¹School of Geometrics, Liaoning Technical University, Fuxin, Liaoning 123000, China

²The Aerospace Information Research Institute, Chinese Academy of Science, Beijing 100190, China

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Abstract Get PDF(in Chinese)

Figures & Tables(14)

Fig. 1. Polarization coherence matrixs. (a) T₁₁; (b) T₂₂; (c) T₃₃

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Fig. 2. Pauli polarization decomposition pseudo-color maps. (a) GF-3; (b) RADARSAT-2

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Fig. 3. H/A/α polarization decomposition results from GF-3 full-polarized SAR. (a) Scattering entropy; (b) mean scattering angle

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Fig. 4. Polarization decomposition results from GF-3 and RADARSAT-2. (a) Scattering entropy; (b) scattering angle

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Fig. 5. H-α scattering plane. (a) GF-3; (b) RADARSAT-2

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Fig. 6. Maximum likelihood classification flow chart based on H/A/α-Wishart

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Fig. 7. Classification result of Yellow River delta by GF-3 full-polarization SAR

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Table 1. Image parameters used in this paper

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Table 1. Image parameters used in this paper

Satellite	Scene ID	Acquisition time (UTC)	Sensor	Resolution /m	Swath width /km
GF-3	3018619	2016-11-15	SAR	8	30
RADARSAT-2	05350120	2016-08-26	SAR	8	25
RADARSAT-2	05350130	2016-09-10	SAR	8	25
GF-2	1786033	2016-08-26	PMS2	1	45
GF-2	1878224	2016-08-26	PMS2	1	45
GF-2	1786032	2016-08-26	PMS2	1	45

Table 2. Polarization parameters bias from GF-3 and RADARSAT-2
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Table 2. Polarization parameters bias from GF-3 and RADARSAT-2
Parameter GF-3 RADARSAT-2
Water body Building Plant Mean Water body Building Plant Mean
H 0.072 0.092 0.139 0.101 0.126 0.087 0.182 0.132
α 3.740 6.800 10.230 6.923 6.045 6.901 8.673 7.206

Table 3. Statistics of polarization measurement accuracy

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Table 3. Statistics of polarization measurement accuracy

No. of space in Fig.6	GF-3			RADARSAT-2
No. of space in Fig.6	Water body	Plant	Building	Water body	Plant	Building
1	0	0.0023	0	0	0.0017	0.0007
2	0	0.0283	0.0017	0	0.0017	0.0030
3	0	0.1903	0.5063	0	0.0437	0.4147
4	0	0.5503	0.2117	0	0.4110	0.1317
5	0.0023	0.2160	0.0553	0.1540	0.4320	0
6	0	0	0.2170	0	0	0.4453
7	0	0	0.0040	0	0	0.0033
8	0.9977	0.0127	0.0040	0.8460	0	0.0013
Average accuracy	0.9977	0.5786	0.7233	0.8460	0.4127	0.8600
Overall accuracy	0.7665			0.7062

Table 4. Joint factor ρ_cs of three kinds of typical ground features
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Table 4. Joint factor ρ_cs of three kinds of typical ground features
Satellite ρ_cs
Waterbody Building Plant Mean
GF-3 85.34 28.99 122.72 79.01
RADARSAT-2 80.25 30.84 118.54 76.54

Table 5. List of training parameters for initial classification

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Table 5. List of training parameters for initial classification

Initial iteration parameter	Value
Number of iterations	10
Non-convergent pixel proportion /%	2
Window size	Azimuth direction	5
	Range direction	5
Boundary conditions of8 initial clustering	No.1	0.9<H<1	55<α<90
	No.2	0.9<H<1	40<α<55
	No.3	0.5<H<0.9	50<α<90
	No.4	0.5<H<0.9	40<α<50
	No.5	0.5<H<0.9	0<α<40
	No.6	0 <H<0.5	47.5<α<90
	No.7	0 <H<0.5	42.5<α<47.5
	No.8	0 <H<0.5	0<α<42.5

Table 6. Variable values in iterative process

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Table 6. Variable values in iterative process

Number of iterations	Non-convergent pixel number	Minimum distance
1	16777216	-9.635548
2	6398359	-11.468143
3	3690955	-12.511221
4	2418604	-12.684139
5	1868671	-12.705543
6	1374417	-12.712374
7	992203	-12.717149
8	748956	-12.720287
9	585886	-12.722660
10	487202	-12.724305

Table 7. Accuracy of GF-3 full-polarization SAR classification results of Yellow River delta

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Table 7. Accuracy of GF-3 full-polarization SAR classification results of Yellow River delta

Type	Accuracy /%
Type	Water body	Plant	Building	Bare soil	Intertidal zone
Water body	90.50	0	0	10.35	12.30
Plant	0	74.30	2.2	0.28	8.02
Building	0	5.03	71.28	7.05	4.741
Bare soil	4.25	15.62	16.37	66.02	4.619
Intertidal zone	5.25	2.949	10.15	16.3	70.32

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Li Jiahui, Wang Xiaochen. Analysis and Accuracy Evaluation of Scattering Characteristics of GF-3 Full-Polarized SAR[J]. Chinese Journal of Lasers, 2020, 47(3): 310002

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