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Frontiers of Earth Science

Front. Earth Sci.    2019, Vol. 13 Issue (2) : 351-360     https://doi.org/10.1007/s11707-018-0733-9
RESEARCH ARTICLE |
Comparison of C- and L-band simulated compact polarized SAR in oil spill detection
Xiaochen WANG1,2,3, Yun SHAO1,2,3, Fengli ZHANG1,2,3(), Wei TIAN1,2,3
1. Laboratory of Target Microwave Properties, Deqing Academy of Satellite Applications, Huzhou 313200, China
2. Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China
3. University of Chinese Academy of Sciences, Beijing 100049, China
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Abstract

This paper presents the compact polarized (CP) pseudo quad-pol parameters for the detection of marine oil spills and segregation of lookalikes using simulated CP SAR data from full-polarized (FP) SAR imagery. According to the CP theory, 11 polarized parameters generally used for the detection of oil spills were derived from reconstructed pseudo quad-pol data for both C and L bands. In addition, the reconstruction performance between C and L bands was also compared by evaluating the reconstruction accuracy of retrieved polarized parameters. The results show that apart from σHV and RH, other polarized parameters of σHH, σVV, H, α, ϕH−V, r, ρH−V, and γ can be reconstructed with satisfactory accuracy for both C and L bands. Furthermore, C band has a higher reconstruction accuracy than L band, especially for ϕH−V. Moreover, the effect of reconstruction of polarized parameters on oil spill classification was also evaluated using the maximum likelihood classification (MLC) method. According to the evaluation of kappa coefficients and mapping accuracy, it is recommended to use σHH, σVV, H, ρH−V, and γ of the C band CP SAR for marine oil spill classification.

Keywords compact polarized      reconstruction      oil spill      classification     
Corresponding Authors: Fengli ZHANG   
Just Accepted Date: 29 November 2018   Online First Date: 03 January 2019    Issue Date: 16 May 2019
 Cite this article:   
Xiaochen WANG,Yun SHAO,Fengli ZHANG, et al. Comparison of C- and L-band simulated compact polarized SAR in oil spill detection[J]. Front. Earth Sci., 2019, 13(2): 351-360.
 URL:  
http://journal.hep.com.cn/fesci/EN/10.1007/s11707-018-0733-9
http://journal.hep.com.cn/fesci/EN/Y2019/V13/I2/351
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Xiaochen WANG
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Fig.1  Flowchart of pseudo quad-pol data reconstruction.
Scene ID Satellite Band Image name Observation time Scene position
Latitude Longitude
1 RADADSAT-2 C RD2016715543-1 07-JUL-2016 06:48 36°00¢N 120°45¢E
2 ALOS L ALPSRP100140730 11-DEC-2007 13:33 36°30¢N 126°05¢E
Tab.1  Radar parameters of quad-polarized data used for this study
Fig.2  Location of oil spills and segregation of lookalikes in SAR imagery. (a) C-band RADADSAT-2 quad-polarized SAR imagery, acquisition in 2016-7-7, Yellow Sea, China. (b) L-band ALOS PALSAR quad-polarized SAR imagery, acquisition in 2007-12-11, Cheonsu Bay, South Korea.
Polarized parameters Definition
Backscattering coefficient σHH0=SHHSHH*, σVV0=SVVSVV* , σHV0=SHVSHV*
Entropy H=i =13 pilog?3pi (pi=λ i/ j=13λj), λ i is the ith eigenvalue of coherency matrix [ T]
Scattering angle α=p1α1+ p2 α2 +p3α3, αi is derived from the ith eigenvalue of coherency matrix [T]
Reference height R H= λ3λ1
Co-polarized phase difference φH-V= S HHSVV*
Co-polarized power ratio r =|SHH|2 |SVV|2
Co-polarized correlation ρH-V= |SHHSVV*|/|S HH|| SVV|
Conformity coefficient γ =2(Re(SHHSVV* )-|SHV|2)(|SHH| 2+2 |SHV|2+ |SVV|2)
Tab.2  Polarized parameters used in this paper
Fig.3  Reconstruction performance for HH, HV, and VV channels. (a) HH channel of C band; (b) HH channel of L band; (c) HV channel of C band; (d) HV channel of L band; (e) VV channel of C band; (f) VV channel of L band.
Band Parameter Ocean surface features Average accuracy
Ocean Oil spills Lookalikes
C σHH 0.004 0.056 0.023 0.027
L 0.071 0.106 0.038 0.071
C σHV 0.905 1.494 0.765 1.054
L 0.442 6.870 0.555 2.622
C σVV 0.006 0.048 0.002 0.056
L 0.075 0.158 0.046 0.093
C H 0.081 0.227 0.025 0.111
L 0.007 0.437 0.080 0.174
C α 0.004 0.067 0.013 0.028
L 0.045 0.112 0.021 0.059
C RH 0.894 2.532 0.636 1.354
L 0.175 10.639 1.092 3.968
C φH-V 0.110 0.182 0.324 0.205
L 0.421 0.576 0.834 0.610
C r 0.034 0.211 0.003 0.086
L 0.149 0.104 0.068 0.107
C ρH-V 0.012 0.160 0.034 0.068
L 0.007 0.220 0.004 0.077
C γ 0.002 0.428 0.012 0.147
L 0.011 0.628 0.008 0.215
Tab.3  Comparison of polarized parameters between C- and L-bands
Band Parameter Ocean surface features Kappa coefficient Mapping accuracy/%
Ocean Oil spills Lookalikes
C σHH 0.0327 0.0027 0.0107 0.6799 80.6
L 2.155 0.1449 0.6838 0.5509 68.4
C σVV 0.0445 0.0037 0.0146 0.7028 82.1
L 2.056 0.1344 0.7161 0.5721 70.1
C H 0.1060 0.6956 0.2192 0.7251 84.4
L 0.1885 0.8340 0.2910 0.4428 63.5
C α 49.43 54.23 49.26 0.2315 52.1
L 44.44 50.73 45.96 0.2467 48.3
C φH-V 0.0243 0.0197 0.1533 0.0917 49.2
L 0.0726 0.0466 0.0056 0.2591 48.9
C r 0.7374 0.7551 0.7614 0.2364 50.6
L 1.0516 1.0997 0.9635 0.1217 46.1
C ρH-V 0.9510 0.4873 0.8803 0.7171 84.1
L 0.9044 0.3761 0.8377 0.4450 63.6
C γ 0.9360 0.2864 0.8576 0.7313 84.9
L 0.8946 0.1655 0.8205 0.4428 63.6
Tab.4  Classification performance of CP parameters between C- and L-bands
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