Measuring marine oil spill extent by Markov Random Fields

Miguel Moctezuma; Flavio Parmiggiani; Ludwin Lopez Lopez

doi:10.1117/12.2068325

14 October 2014 Measuring marine oil spill extent by Markov Random Fields

Miguel Moctezuma, Flavio Parmiggiani, Ludwin Lopez Lopez

Proceedings Volume 9240, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2014; 92400A (2014) https://doi.org/10.1117/12.2068325
Event: SPIE Remote Sensing, 2014, Amsterdam, Netherlands

Abstract

The Deepwater Horizon oil spill of the Gulf of Mexico in the spring of 2010 was the largest accidental marine oil spill in the history of the petroleum industry. An immediate request, after the accident, was to detect the oil slick and to measure its extent: SAR images were the obvious tool to be employed for the task. This paper presents a processing scheme based on Markov Random Fields (MRF) theory. MRF theory describes the global information by probability terms involving local neighborhood representations of the SAR backscatter data. The random degradation introduced by speckle noise is dealt with a pre-processing stage which applies a nonlinear diffusion filter. Spatial context attributes are structured by the Bayes equation derived from a Maximum-A-Posteriori (MAP) estimation. The probability terms define an objective function of a MRF model whose goal is to detect contours and fine structures. The markovian segmentation problem is solved with a numerical optimization method. The scheme was applied to an Envisat/ASAR image over the Gulf of Mexico of May 9, 2010, when the oil spill was already fully developed. The final result was obtained with 51 recursion cycles, where, at each step, the segmentation consists of a 3-class label field (open sea and two oil slick thicknesses). Both the MRF model and the parameters of the stochastic optimization procedure will be provided, together with the area measurement of the two kinds of oil slick.

Citation Download Citation

Miguel Moctezuma, Flavio Parmiggiani, and Ludwin Lopez Lopez "Measuring marine oil spill extent by Markov Random Fields", Proc. SPIE 9240, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2014, 92400A (14 October 2014); https://doi.org/10.1117/12.2068325

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