Journal
COMPUTERS & GEOSCIENCES
Volume 43, Issue -, Pages 207-216Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cageo.2011.10.025
Keywords
Unsupervised fuzzy image segmentation; Number of clusters; Feature extraction; Fuzzy boundaries; SST images; Upwelling
Funding
- Portuguese Foundation for Science Technology [PTDC/EIA/68183/2006]
- Fundação para a Ciência e a Tecnologia [PTDC/EIA/68183/2006] Funding Source: FCT
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In our previous work we applied fuzzy clustering to the problem of identification of upwelling areas from Sea Surface Temperature (SST) images, and showed that the approach was promising. However, the approach required a user-supplied information for annotation of the upwelling area on the map in order to fine-tune parameters of the method. In this paper, we modify the method to apply it in a fully automated manner without any pre-specified expert knowledge. We describe a computational system, FuzzyUPWELL, that provides a framework needed for a totally unsupervised segmentation and delimitation of upwelling areas on SST images. The FuzzyUPWELL system integrates an unsupervised fuzzy clustering algorithm, a threshold procedure combining a set of features extracted from clusters to determine the upwelling fronts, a mechanism to delimitate the upwelling areas by fuzzy boundaries defined from measures of classification uncertainty, and a Graphical User Interface (GUI). The system has been successfully applied to a collection of 113 images obtained at the coastal ocean of Portugal during the upwelling seasons of 1998 and 1999. The collection covers much diverse upwelling situations. The system is shown to be robust to false positives when analysing its response on SST images without upwelling. (C) 2011 Elsevier Ltd. All rights reserved.
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