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U.S. Geological Survey Open-File Report 2009-1072

Geophysical and Sampling Data from the Inner Continental Shelf: Duxbury to Hull, Massachusetts

Skip past contents information Title Page / Contents / List of Figures / Conversion Factors / Abstract / Introduction / Data Collection/Processing / Acknowledgments / References Cited / Appendix 1 / Appendix 2 / Appendix 3

Figure 5, a map showing the acoustic-backscatter intensity of the survey area.

Figure 5.  Map showing sampling sites over acoustic-backscatter intensity in the study area.  Backscatter intensity is an acoustic measure of the hardness and roughness of the seafloor.  In general, higher values (light tones) represent rock, boulders, cobbles, gravel, and coarse sand.  Lower values (dark tones) generally represent fine sand and muddy sediment.  Tonal variations may occur across track in the sidescan-sonar data and between survey days in the multibeam echosounder data.

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