Open-File Report 2016–1168
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High-Resolution Geophysical Data From the Inner Continental Shelf: South of Martha’s Vineyard and North of Nantucket, Massachusetts
Figure 6. Map showing acoustic-backscatter intensity of the sea floor in the survey areas, south of Martha's Vineyard and north of Nantucket, Massachusetts. Backscatter intensity is an acoustic measure of the hardness and roughness. In general, high values (light tones) represent rock, boulders, cobbles, gravel, and coarse sand. Low values (dark tones) generally represent fine sand and muddy sediment. UTM, Universal Transverse Mercator; WGS 84, World Geodetic System of 1984.