Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Larger_Work_Citation:
Citation_Information:
Originator: Larry Poppe
Originator: Ralph S. Lewis
Originator: Richard P. Signell
Originator: Harley J. Knebel
Originator: Mohabir Persaud
Originator: Jane F. Denny
Originator: Kenneth F. Parolski
Originator: Mary L. DiGiacomo-Cohen
Publication_Date: 1999
Title:
Sidescan sonar image, surficial geologic interpretation, and bathymetry of the Long Island Sound sea floor off Roanoke Point, New York
Series_Information:
Series_Name: Geologic Investigations Series Map
Issue_Identification: I-2692
Publication_Information:
Publication_Place: Woods Hole, MA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Description:
Abstract:
Anthropogenic wastes, toxic chemicals, and changes in
land use patterns from residential, commercial, and
recreational development have stressed the
environment of the Sound causing degradation and
potential loss of benthic habitats. Detailed maps of
the sea floor are needed to help evaluate the extent
of adverse impacts and manage resources in the future.
This site was selected because it contains one of
the largest cape-associated shoal complexes along
the north shore of Long Island, a feature that is
clearly important to an understanding of the sediment
transport regime in this part of the Sound.
Interpretations of the mosaic also (1) define the
geological variability of the sea floor, one of the
primary controls of benthic habitat diversity;
(2) provide a detailed framework for future research,
monitoring, and management activities; and (3)
improve our understanding of the processes that
control the distribution and transport of bottom
sediments, benthic habitats, and associated infaunal
community structures. The sidescan mosaic also
serves as base maps for the subsequent selection
of sampling sites and to the accurate interpretation
of point measurements.
This study was part of an interdisciplinary program
to define the surficial geology and benthic habitat
in Long Island Sound and to see how they are
changing with time.
Purpose:
This dataset presents the completed sidescan sonar
mosaic for the Roanoke Point, New York study area.
Supplemental_Information:
Distinctive acoustic patterns present on this mosaic
higher backscatter (light tones), moderate
backscatter, lower backscatter (dark tones), and
elongate patches of alternating high and low
backscatter (sand waves). Boundaries between areas
characterized by these patterns are commonly
gradational and backscatter is not uniform throughout
these areas. Water column phenomena, such as ship
wakes and turbulence around obstructions, can be
observed on the image as well as anthropogenically
produced structures, such as an oil platform and
associated pipeline.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19960611
Ending_Date: 19970611
Currentness_Reference: Ground Condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -072.741211
East_Bounding_Coordinate: -072.624539
North_Bounding_Coordinate: +41.025097
South_Bounding_Coordinate: +40.975100
Keywords:
Theme:
Theme_Keyword_Thesaurus: General
Theme_Keyword: USGS
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: Long Island Sound Research Center
Theme_Keyword: Connecticut Geological and Natural History Survey
Theme_Keyword: sidescan sonar
Theme_Keyword: estuary
Theme_Keyword: benthic habitat
Theme_Keyword: hypoxia
Theme_Keyword: sediment distribution
Theme_Keyword: benthic community
Theme_Keyword: surficial geology
Place:
Place_Keyword_Thesaurus: General
Place_Keyword: Long Island Sound
Place_Keyword: New York
Place_Keyword: Roanoke Point
Place_Keyword: estuary
Place_Keyword: Central Long Island Sound
Access_Constraints: None
Use_Constraints:
The U.S. Geological Survey must be referenced as the
originator of the dataset in any future products or
research derived from these data.
Although this derived data set and it's lineage dataset
have been used by the USGS, no warranty, expressed
or implied, is made by the USGS as to the accuracy
of the data and/or related materials. The act of
distribution shall not constitute any such warranty,
and no responsibility is assumed by the USGS in the use
of these data or related materials.
SIS-1000 Datasonics sidescan sonar system set to
sweep 100-m to either side of the shiptrack and
logged digitally to 8-mm tape on an ISIS data
acquisition system.
Type_of_Source_Media: cartridge tape
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19960611
Ending_Date: 19970611
Source_Currentness_Reference: Ground Condition
Source_Citation_Abbreviation: QMIPS
Source_Contribution:
These data were processed to apply radiometric and
geometric corrections. The processed swaths were
then mapped and digitally mosaicked to complete
the sidescan sonar mosaic for the study area.
Process_Step:
Process_Description:
QMIPS data were processed through a median
filtering routine to suppress speckle noise.
Navigation merged into the header record portion
of the data were plotted and checked. The QMIPS
data were exported for import to the WHIPS
processing.
Source_Used_Citation_Abbreviation: QMIPS
Process_Date: Unknown
Source_Produced_Citation_Abbreviation: WHIPS
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jane Denny
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02532-1598
Country: USA
Contact_Voice_Telephone: (508) 548-8700 x2311
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: jdenny@usgs.gov
Process_Step:
Process_Description:
The individual sidescan swaths were processed
to apply a slant-to-ground range correction,
shading correction and striped noise removal.
the geometrically and radiometrically enhanced
swaths were then individually mapped to a user
specified scale and projection.
Source_Used_Citation_Abbreviation: WHIPS
Process_Date: Unknown
Source_Produced_Citation_Abbreviation: WHIPS
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jane Denny
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02532-1598
Country: USA
Contact_Voice_Telephone: (508) 548-8700 x2311
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: jdenny@usgs.gov
Process_Step:
Process_Description:
The individually mapped swaths were imported
into a PCI "pix" database file for digital
mosaicking. The mosaicking procedure included
trimming off unwanted data where two sonar images
overlapped, tone matching the adjacent sonar
images if there are differences, and combining
the individual strips together into a
composite image.
Utilizing the PCI Remote Sensing Software
reprojection utility, the completed and
archived mosaic was reprojected to UTM to
be consistent with current Long Island
Sound GIS datasets.
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: WGS84
Semi-major_Axis: 6378137.00
Denominator_of_Flattening_Ratio: 0.00335281066747
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: (508) 548-8700
Contact_Facsimile_Telephone: (508) 457-2310
Resource_Description: Roanoke Point, NY sidescan sonar mosaic: GEOTIFF image.
Distribution_Liability:
Although this derived data set and it's lineage
dataset have been used by the USGS, no warranty,
expressed or implied, is made by the USGS as to
the accuracy of the data and/or related materials.
The act of distribution shall not constitute any such
warranty, and no responsibility is assumed by the USGS
in the use of these data or related materials.
The sidescan sonar mosaic is available as a
GEOTIFF image with accompanying world file and
georeference report. To utilize this data, the user
must have an image viewer, image processing or
GIS software package capable of importing a
GEOTIFF image. If the georeferencing information
cannot be imported, the user may wish to obtain
the georeference information contained in a separate
file, georep.txt, included in the zip file.
