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High-Resolution Geophysical Data Collected Aboard the U.S. Geological Survey Research Vessel Rafael to Supplement Existing Datasets From Buzzards Bay and Vineyard Sound, Massachusetts

Figure 7. Map showing acoustic-backscatter intensity collected in Buzzards Bay and Vineyard Sound, Massachusetts. Backscatter intensity is an acoustic measure of the hardness and roughness of the sea floor. 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. Is., Island.