U.S. Geological Survey Open-File Report 2009-1001
Geological Interpretation of the Sea Floor Offshore of Edgartown, Massachusetts
SI to Inch/Pound
Phi-notation (Krumbein, 1934) as used in this report is defined as: Φ = -log2 (d), where d is the grain diameter in mm. Phi-class intervals in millimeters are given in the data dictionary of the Sediments section.
Nautical speeds are measured in knots (kts). 1 knot = 0.514 m/s.
The frequencies of sidescan sonar, single, and multiple beams are measured in kilohertz (kHz) and hertz (Hz).
The vertical datum for tidal-zone measurements is mean lower low water.