Seabed sediments for UKSeaMap project

A product of a rapid study by the British Geological Survey (BGS) for JNCC to provide data as GIS layers to be incorporated into the UKSeaMap project. To complete this work, 13 of the 15 categories of FOLK classification in DigSBS250 were combined using SQL and the merge command to create 4 out of the 5 classes required for the UKSeaMap project. The remaining 2 Folk categories, ?muddy sands? and ?slightly gravely muddy sands?, were split at the 8:2 sand: mud ratio into either the ?sand and muddy sand? or ?mud and sandy mud? classes. Polygon boundaries were manually edited based on individual BGS sample locations. Rock categories within DigSBS250 were also classified as rock in UKSeaMap. Previous datasets (CR/01/238) on potential reefs were then added, replacing DigSBS at these locations. The CLIP command was used to ?cut? into the underlying DigSBS dataset to minimise topological errors.