Remote identification of a shipwreck site from MBES backscatter

TitleRemote identification of a shipwreck site from MBES backscatter
Publication TypeJournal Article
AuthorsMasetti, G, Calder, Brian R.
JournalJournal of Environmental Management
Date Published30 November 2012
Place Published
KeywordsMultibeam Sonars, Seafloor Characterization

The method described attempts to remotely identify the shape of an anthropogenic object, such as a wreck of a modern vessel, using reflectivity data from Multi-Beam Echosounder (MBES) systems. In the beam domain, the backscatter strength values – geometrically and radiometrically corrected – are used to extract a large number of Gray Level Co-occurrence Matrix (GLCM) features with different input parameters. Principal Component Analysis (PCA) is applied in order to achieve dimensionality reduction whilst a K-means algorithm clusters as “shipwreck site” a large number of beams for each line. After the geo-referencing process, a K-nearest-neighbors (K-NN) technique is applied as a filter for possible misclassifications. Finally, the shape of the shipwreck site is defined from the georeferenced beams using the α-shape method, constructing an output compatible with Geographic Information Systems (GIS).

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