Remote Sensing Applications and Decision Support

Analysis of scattering mechanisms over sea oil slicks based on eigenvalues of simplified coherence matrix

[+] Author Affiliations
Chen Wang

Ocean University of China, College of Information Science and Engineering, Songling Road, Qingdao 266100, China

Chaofang Zhao, Kan Zeng, Yunhua Wang

Ocean University of China, Ocean Remote Sensing Institute, Yushan Road, Qingdao 266003, China

J. Appl. Remote Sens. 9(1), 095974 (Dec 28, 2015). doi:10.1117/1.JRS.9.095974
History: Received June 3, 2015; Accepted December 2, 2015
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Abstract.  Analytical forms of eigenvalues are given based on the coherence matrix simplified under the hypothesis of reflection symmetry, and three parameters PS, PD, and PM representing the individual contribution of single, double, and multiple scattering mechanisms to the total backscattering are defined. The single scattering is confirmed as a direct description of the Bragg scattering while the double and multiple scatterings are supposed to be classified as non-Bragg scattering. Experiments using quad-polarization single look complex C-band RADARSAT-2 SAR images indicate that the oil slick mainly dampens the Bragg scattering, due to the reduction of single scattering over oil-covered sea surfaces. The decrease of PS results in the corresponding increase of PD and PM, and the values of PS over clean sea surfaces are higher than those of oil slicks on the PS image. Therefore, PS can be selected to discriminate oil slicks from clean sea surfaces. By comparing the two imagery experiments, we also note that the relative contribution of Bragg scattering to the backscattering over oil-covered surfaces is highly dependent on the local wind field.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Chen Wang ; Chaofang Zhao ; Kan Zeng and Yunhua Wang
"Analysis of scattering mechanisms over sea oil slicks based on eigenvalues of simplified coherence matrix", J. Appl. Remote Sens. 9(1), 095974 (Dec 28, 2015). ; http://dx.doi.org/10.1117/1.JRS.9.095974


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