20191217 09360800 1.0 TRUE Acoustic classes corresponding to different sediment types were extracted from the backscatter data using various methods: image segmentation, isoclustering and manual tracings. Acoustic classes were classified into seabed substrate types using sediment sample data. A modified Folk classification scheme was used for the sediment classification and is displayed in the attribute field “INF_Class” of the associated shapefile. Seabed Classification substrate INFOMAR INSS MESH Substrate classes were generated from the analysis of multibeam echosounder data. Rock outcrops were manually digitised from shaded relief imagery. INFOMAR/INSS Project, a joint seabed mapping project between the Geological Survey Ireland and the Marine Institute. 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