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U.S. Geological Survey Open-File Report 2015-1153

Sea-Floor Texture and Physiographic Zones of the Inner Continental Shelf From Salisbury to Nahant, Massachusetts, Including the Merrimack Embayment and Western Massachusetts Bay


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Color-shaded releif image of a digital elevation model (DEM), produced from swath-interferometric and multibeam bathymetry and lidar at 30-meter resolution. High rugosity and relief are most often associated with rocky areas, whereas smooth, low-relief regions tend to be blanketed by fine-grained sediment deposits.

Figure 4. A digital elevation model (DEM), produced from swath-interferometric and multibeam bathymetry and lidar at 30-meter resolution (table 2). High rugosity and relief are most often associated with rocky areas, whereas smooth, low-relief regions tend to be blanketed by fine-grained sediment deposits. NAVD 88, North American Vertical Datum of 1988.

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