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 "description": "Source: Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office for Coastal Management (OCM). MarineCadastre.gov. 2013 Tanker Vessel Density. Retrieved May 23, 2017 from <a href='https://marinecadastre.gov/data/' target='_blank'><b>marinecadastre.gov/data.<\/b><a>\n\nDescription: Automatic Identification Systems (AIS) are a navigation safety device that transmits and monitors the location and characteristics of many vessels in U.S. and international waters in real-time. This dataset represents the density of tanker vessel traffic in 2013 for the contiguous United States offshore waters from tanker vessels with AIS transponders in 100 meter grid cells. The dataset is best interpreted using a high to low density scale and does not represent actual vessel counts.\n\nMetadata Link: <a href='https://coast.noaa.gov/dataservices/Metadata/TransformMetadata?u=https://coast.noaa.gov/data/Documents/Metadata/harvest/MarineCadastre/VesselDensityTanker2013.xml&f=html' target='_blank'><b>https://coast.noaa.gov/dataservices/Metadata/TransformMetadata?u=https://coast.noaa.gov/data/Documents/Metadata/harvest/MarineCadastre/VesselDensityTanker2013.xml&f=html<\/b><a><\/br>\n",
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