NOAA/NOS EEZ Bathymetry
The US Exclusive Economic Zone (EEZ) is a zone that surrounds all US possessions and trust territories to a distance of 200 nautical miles from the coastline. Sovereign rights to all natural resources in this zone were unilaterally declared by Presidential Order on March 10, 1983. The combined area of this zone is equal to two-thirds of all US lands prior to the declaration.
Gridded bathymetric data for the EEZ was released by the National Ocean Service (NOS) of NOAA in 1991. The source data was collected using multibeam swath sounding techniques. The gridded data is available in two forms: a UTM (Universal Transverse Mercator) grid and a Geographic grid. See the table below for details. Data values are negative integers that represent depths in meters. A value of 0 indicates no data.
How to Import
Choose Import DEM → NOAA/NOS EEZ Bathymetry from the File menu and then select the file, which should have a filename extension of "*.grd" (Geographic) or ".dat" (UTM). Before using tools in the Extract menu, go to the Planet Info panel of the File → Set Preferences dialog and set the Earth ellipsoid to either "GRS 1980" or "WGS 1984" (these are almost identical). Otherwise calculations of lengths, areas, slopes, etc. will be less accurate.
Word Data Center for Marine Geology and Geophysics (WDC MGG) of the National Geophysical Data Center (NGDC) of the National Oceanic and Atmospheric Administration (NOAA)
This data can be purchased online and is available on various media. It is included on NGDC's Global Relief CD-ROM. It is unclear whether complete coverage of the EEZ is available.
The US Geological Survey has been charged with surveying this region, and in 1984 launched a project called EEZ-SCAN to study it with a long-range sidescan sonar system called GLORIA (Geological Long-Range Inclined Asdic). For more information on this project see: http://walrus.wr.usgs.gov/gloria.
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