Analysis of Scattering Properties of Continuous Slow-Release Slicks on the Sea Surface Based on Polarimetric Synthetic Aperture Radar
Abstract
:1. Introduction
2. Experimental Design and Methodology
2.1. Experimental Design
2.2. Dataset
2.3. Noise Analysis
2.4. Methodology
3. Results
3.1. NESZ Analysis
3.2. Polarization Parameters of Continuous Slow-Release Slick
4. Discussion
4.1. Analysis of Instrument Noise and NRCS
4.2. Analysis of Polarization Scattering Characteristics
5. Conclusions
- Images acquired at small incident angles have higher SNR than those with large incident angles under the same RADARSAT-2 system. The NRCS of cross-polarization channels are lower than those of co-polarization channels, which are more seriously affected by the noise floor because of their proximity to the NESZ baseline.
- The polarimetric scattering properties of continuous slow-release slicks differ from those of clean seawater, even for anthropogenic ocean surface slicks, since continuous slow-release slicks exhibit complex, multiple scattering mechanisms, possibly as a result of the comprehensive influence of surface scattering, volume scattering, and the noise floor. In addition, continuous slow-release (biogenic) slicks exhibit greater damping characteristics and more complex random scattering characteristics than anthropogenic ocean surface slicks (simulated with peanut oil) in this experiment.
- For slick detection, the combinations of entropy (H) and modified anisotropy (A12) permit fairly robust identification of slicks from SAR images under different sea conditions.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Case/Sensor | Case 1 (RADARSAT-2) | Case 2 (RADARSAT-2) |
---|---|---|
Date | 8 May 2010 | 18 September 2009 |
Time | 12:01 a.m. (UTC) | 10:49 a.m. (UTC) |
Region | The Gulf of Mexico (26°48′ N, 92°02′ W) | The South China Sea (18°06′ N, 109°24′ E) |
Mode/Product | Fine Quad-Pol mode SLC | Fine Quad-Pol mode SLC |
Frequency | C-band (5.405 GHz) | C-band (5.405 GHz) |
Incidence angle | 41.9–43.4° | 32.3–34.1° |
Resolution (Rg × Az) | 5.2 × 7.6 (m) | 5.2 × 7.6 (m) |
Pixel space (Rg × Az) | 4.7 × 5.1 (m) | 4.7 × 5.1 (m) |
Polarization | HH, HV, VH, VV | HH, HV, VH, VV |
Wind speed/wind direction | 6.5 m/s (167°) | 10 m/s |
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Li, G.; Li, Y.; Liu, B.; Hou, Y.; Fan, J. Analysis of Scattering Properties of Continuous Slow-Release Slicks on the Sea Surface Based on Polarimetric Synthetic Aperture Radar. ISPRS Int. J. Geo-Inf. 2018, 7, 237. https://doi.org/10.3390/ijgi7070237
Li G, Li Y, Liu B, Hou Y, Fan J. Analysis of Scattering Properties of Continuous Slow-Release Slicks on the Sea Surface Based on Polarimetric Synthetic Aperture Radar. ISPRS International Journal of Geo-Information. 2018; 7(7):237. https://doi.org/10.3390/ijgi7070237
Chicago/Turabian StyleLi, Guannan, Ying Li, Bingxin Liu, Yongchao Hou, and Jianchao Fan. 2018. "Analysis of Scattering Properties of Continuous Slow-Release Slicks on the Sea Surface Based on Polarimetric Synthetic Aperture Radar" ISPRS International Journal of Geo-Information 7, no. 7: 237. https://doi.org/10.3390/ijgi7070237