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Open-File Report 2016-1119


Shallow Geology, Sea-Floor Texture, and Physiographic Zones of Vineyard and Western Nantucket Sounds, Massachusetts


Conversion Factors, Datums, and Supplemental Information

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Conversion Factors

International System of Units to U.S. customary units

Multiply

By

To obtain

Length

centimeter (cm)

0.3937

inch (in.)

millimeter (m)

0.03937

inch (in.)

meter (m)

3.281

foot (ft)

kilometer (km)

0.6214

mile (mi)

kilometer (km)

0.5400

mile, nautical (nmi)

meter (m)

1.094

yard (yd)

Area

square kilometer (km2)

0.3861

square mile (mi2)

Velocity

meter per second (m/s)

3.281

foot per second (ft/s)

 

Datum

Vertical coordinate information for bathymetry and seismic horizons are referenced to North American Vertical Datum of 1988 (NAVD 88).

Vertical coordinate information for seismic profiles and geologic cross sections are referenced to instantaneous sea level (converted from two-way traveltimes to meters by using a constant sound velocity of 1,500 meters per second through water and sediments).

Depth values cited from some references are given in meters below sea level (mbsl).

Elevation, as used in this report, refers to distance above or below the vertical datum.

Horizontal coordinate information is referenced to the World Geodetic System of 1984 (WGS 84) in a Geographic Coordinate System.  

 

Supplemental Information

Particle size in phi units may be converted to millimeters (mm) as follows: mm=2-phi.

The frequencies produced by marine acoustic instruments are measured in hertz (Hz), periods per second.

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