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This shapefile denotes the location of underwater photos and videos taken at accuracy assessment (AA) sites surveyed around Vieques. The purpose of the AA data was to collect information on current habitat conditions at random locations throughout the mapping area. Locations were determined by an iterative, GIS-based, stratified random sampling technique to ensure that all bottom classifications would be assessed. This information was used to evaluate the thematic accuracy of the Vieques benthic habitat map. |