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GeoTIFF image of the backscatter intensity of the sea floor of the Historic Area Remediation Site in 1998 (3-m resolution, Mercator, WGS 84)

Dates

Publication Date
Start Date
1998-10-30
End Date
1998-11-04

Citation

Butman, Bradford, Danforth, W.W., Clarke, J.E.H., and Signell, R.P., 2017, Bathymetry and backscatter intensity of the sea floor of the Historic Area Remediation Site in 1996, 1998, and 2000: U.S. Geological Survey data release, https://doi.org/10.5066/F74B2ZGX.

Summary

Surveys of the bathymetry and backscatter intensity of the sea floor of the Historic Area Remediation Site (HARS), offshore of New York and New Jersey, were carried out in 1996, 1998, and 2000 using a Simrad EM1000 multibeam echosounder mounted on the Canadian Coast Guard ship Frederick G. Creed. The objective of the multiple echosounder surveys was to map the bathymetry and surficial sediments over time as dredged material was placed in the HARS to remediate contaminated sediments. Maps derived from the multibeam surveys show sea-floor bathymetry, shaded-relief bathymetry, and backscatter intensity (a measure of sea-floor texture and roughness) at a spatial resolution of 3 meters. The area was mapped by the U.S. Geological Survey [...]

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Attached Files

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Hars1998Mos.tif_meta.xml
“FGDC CSDGM metadata.”
Original FGDC Metadata

View
23.72 KB
Hars1998Mos_browse.jpg
“Browse graphic of data.”
thumbnail 490.64 KB
Hars1998Mos.zip
“Download of data and metadata.”
5.11 MB

Purpose

The GeoTIFF image of backscatter intensity provides qualitative information on the sediment texture and roughness of the sea floor. Backscatter intensity, a measure of the strength of the acoustic return from the sea floor, is a function of the properties of the surficial sediments and of the bottom roughness. Generally high backscatter intensity (strong return), shown as light gray tones, is associated with rock or coarse-grained sediment, and low backscatter intensity (weak return), shown as dark gray tones, is associated with fine-grained sediments.

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