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

Chen Wang; Chaofang Zhao; Kan Zeng; Yunhua Wang

doi:10.1117/1.JRS.9.095974

28 December 2015 Analysis of scattering mechanisms over sea oil slicks based on eigenvalues of simplified coherence matrix

Chen Wang, Chaofang Zhao, Kan Zeng, Yunhua Wang

Author Affiliations +

Journal of Applied Remote Sensing, Vol. 9, Issue 1, 095974 (December 2015). https://doi.org/10.1117/1.JRS.9.095974

Abstract

Analytical forms of eigenvalues are given based on the coherence matrix simplified under the hypothesis of reflection symmetry, and three parameters P_S, P_D, and P_M 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 P_S results in the corresponding increase of P_D and P_M, and the values of P_S over clean sea surfaces are higher than those of oil slicks on the P_S image. Therefore, P_S 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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Chen Wang, Chaofang Zhao, Kan Zeng, and Yunhua Wang "Analysis of scattering mechanisms over sea oil slicks based on eigenvalues of simplified coherence matrix," Journal of Applied Remote Sensing 9(1), 095974 (28 December 2015). https://doi.org/10.1117/1.JRS.9.095974

Published: 28 December 2015

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