Dataset description: 2010-012-FA-BA-001-01

CARIS (2010), a swath-bathymetry-processing software package, was used to post-process the bathymetric soundings. Sounding data were rectified for ship motion, and spurious soundings were eliminated. Corrections for sound velocity changes within the water column and tidal offsets (utilizing a NOAA discrete tidal zoning model and tidal observations from two Mississippi tide stations) were also applied to the soundings. Final soundings were referenced to mean lower low water (MLLW) vertical datum. Processed soundings from approximately 1,800 km of tracklines yielded a final bathymetric surface area of about 265 km2, which was gridded at a resolution of 50 m/pixel.

Contacts

Contact	Elizabeth P Pendleton WHSC_data_contact@usgs.gov

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Location of materials and files

Physical media	Pendleton, E.A., Baldwin, W.E., Danforth, W.W., Dewitt, N.T., Forde, A.S., Foster, D.S., Kelso, K.W., Pfeiffer, W.R., Turecek, A.M., Flocks, J.G., and Twichell, D.C, 2011, Geophysical data from offshore of the Gulf Islands National Seashore, Cat Island to Western Horn Island, Mississippi: U.S. Geological Survey Open-File Report 2010-1178, available online at http://pubs.usgs.gov/of/2010/1178/.
Public files	http://pubs.usgs.gov/of/2010/1178/

Activities and equipment

Activity	Equipment
2010-012-FA	SEA SWATHplus-M 234 kHz SWATHplus is a pole-mounted swath bathymetry sonar that can achieve swath widths of ~5 times the water depth. Owned by Woods Hole and Santa Cruz. (wh-sfm)