USGS Report Series 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

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

/ Title Page / List of Figures / Conversion Factors / Abbreviations / Abstract / Introduction / Methods / Results / Discussion / Summary / Acknowledgments / References Cited / Appendix — Geospatial Data / Citation Page /

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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