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Detection of Sea Surface Temperature Fronts from SAR Images


Sea surface temperature (SST) fronts are important for fisheries and marine ecology, as well as upper ocean dynamics, weather forecasting and climate monitoring. In this paper, we propose a new approach to detect SST fronts from RADARSAT-2 ScanSAR images, based on the correlation of SAR-derived wind speeds using the gray level co-occurrence matrix (GLCM) approach. Due to the large differences between the correlation of wind speeds for SST fronts compared to other areas, SST fronts can be detected by the threshold method. To eliminate small-scale features (or noise), the 30 km scale is used as the length threshold for the detection of the SST fronts. The proposed method is effective when wind speeds are between 3 to 13 m/s. The overall accuracy of our method is about 93.6%, which is sufficient for operational applications.