Skip USGS links group
USGS - science for a changing world
NOAA logo with link to NOAA home page

Woods Hole Science Center

End of USGS links group

Sidescan-Sonar Imagery and Surficial Geologic Interpretations of the Sea Floor in Central Rhode Island Sound


Data Acquisition and Processing

Skip past contents information
Data Acquisition and Processing
Figure 5. Photo of NOAA Ship RUDE (courtesy of NOAA).
Figure 5. Photograph of NOAA Ship RUDE. Click on figure for larger image.

Sidescan-sonar and bathymetric data were collected aboard the NOAA Ship RUDE in 2004 (fig. 5). A Klein 5500 towfish (455 kHz) acquired sidescan-sonar data, which were recorded using Triton ISIS software and archived in extended Triton format (xtf). Sidescan-sonar data were processed using USGS software packages XSonar and ShowImage (Danforth, 1997). A median filtering routine was applied to the sidescan-sonar data to remove speckle noise. Sonar data were further processed to correct for slant-range and radiometric distortion inherent in the sonar data and corrected for towfish layback. Sonar data were mosaicked using XSonar, resulting in an enhanced, geographically correct, sidescan-sonar mosaic with 1 meter/pixel resolution.

An Odom Echotrac DF3200 MKII dual-beam echo sounder operating at 24 and 200 kHz acquired sounding data aboard the NOAA Ship RUDE. In areas of interest, shallow-water multibeam echo-sounder data were acquired with a Reson SeaBat 8125 operating at 455 kHz. Bathymetric data were processed using CARIS HIPS/SIPS software. Sounding and multibeam data were used with IVS Fledermaus software to create a bathymetric surface with full coverage of the study area and 45-m resolution, which eliminated gaps between track lines.

About 580 km of seismic-reflection data with 1- to 2-m resolution were collected by USGS in 1980 aboard the R/V NEECHO using an EG&G Uniboom seismic system that filtered to a 400 to 4000 Hz bandpass and that recorded at a quarter-second sweep rate (Needell and others, 1983a, b).

Skip Navigation

Accessibility FOIA Privacy Policies and Notices

U.S. Department of the Interior | U.S. Geological Survey | Coastal and Marine Geology

URL: cmgds.marine.usgs.gov/publications/of2007-1366/html/data.html
Page Contact Information: CMGDS Team
Page Last Modified: Wednesday, 06-Dec-2017 13:17:11 EST