EarthWorks Geospatial Catalog

Automatic Identification System (AIS)

This dataset documents the density of vessel tracks during 2008 in the Massachusetts ocean management planning area and adjacent waters for commercial vessels greater than 299 tons. CZM digitized polygons from this dataset to represent areas where greater than 50 vessels were recorded over the duration of the year 2008 in a 250 x 250-meter grid cell. The raw data were provided courtesy of Stellwagen Bank National Marine Sanctuary. Applied Science Associates (ASA) analyzed the raw data to create a raster grid. CZM digitized this dataset from the raster produced by ASA.
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