研究目的
Exploiting coherent co–polarized synthetic aperture radar (SAR) information for sea oil seep monitoring purposes, analyzing the influence of incidence angle and wind conditions on the co–polarized phase difference (CPD), and assessing the benefits of using phase information for oil seep observation.
研究成果
AOI, SNR, and wind speed have an impact on the CPD distribution over both slick–free and slick–covered sea surface, that becomes broader when AOI increases and SNR decreases and narrower when wind speed increases, globally. The co–polarized channels phase information offers unprecedented benefits in mapping the oil seep damping properties.
研究不足
The impact of AOI in broadening the CPD distribution is more significant than the one due to wind speed, and it is more pronounced over sea surface. Noise can concur in an enhanced sea oil seep detection, while reliable sea oil seep characterization is possible only at low AOI.
1：Experimental Design and Method Selection:
A time series of 33 coherent co–polarized TerraSAR–X (TSX) SAR measurements was exploited to observe a well–known oil seep in Gulf of Mexico. The influence of angle of incidence (AOI), noise equivalent sigma zero (NESZ), and sea state conditions on the co–polarized phase information was evaluated over both slick–free and slick–covered sea surface.
2：Sample Selection and Data Sources:
The study area is in the northern part of Gulf of Mexico near the Mississippi river delta. Satellite imagery collected by TSX mission observed an almost persistent oil seep related to the leaking of the Taylor Energy oil platform.
3：List of Experimental Equipment and Materials:
TerraSAR–X (TSX) SAR data.
4：Experimental Procedures and Operational Workflow:
The SAR imagery was partitioned into 5 subsets according to AOI and wind regime. σCPD was evaluated using a 9×9 moving window and, then, 1000 pixels belonging to two regions of interest (ROIs), i.e., sea surface and oil seep, were randomly sampled for each SAR scene.
5：Data Analysis Methods:
The behavior of σCPD over both slick–free and slick–covered sea surface was investigated with respect to acquisition parameters (NESZ and AOI) and meteo–marine conditions (wind regime).
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