Denny, Jane F. , Foster, David S. , Schwab, William C. , and Swift, B. Ann , 2002, Stratigraphic Framework Maps of the Nearshore Area of the inner-continental shelf within the New York Bight: Gridded Thickness of Quaternary Sediment: US Geological Survey, Woods Hole, MA.This is part of the following larger work.
Schwab, William C., Denny, Jane F., Foster, David S., Lotto, Linda L., Allison, Mead A., Uchupi, Elazar, Swift, B. Ann, Danforth, William W., Thieler, Robert E., and Butman, Bradford, 2002, High-Resolution Quaternary seismic stratigraphy of the New York Bight Continental Shelf: Open-File Report OFR02-152, U.S. Geological Survey, Woods Hole, MA.
This is a Raster data set. It contains the following raster data types:
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 200
Ordinates (y-coordinates) are specified to the nearest 200
Planar coordinates are specified in Meters
The horizontal datum used is WGS84.
The ellipsoid used is WGS84.
The semi-major axis of the ellipsoid used is 6378137.0000000.
The flattening of the ellipsoid used is 1/298.26.
Prepared by the US Geological Survey in cooperation with the US Army Corps of Engineers
US Geological Survey
c/o Jane F. Denny
Geologist, Seafloor Mapping Group
384 Woods Hole Road
Woods Hole, MA 012543
USA
508-457-2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
- Hours_of_Service: Monday-Friday, 8am-5pm, Eastern Standard Time
In 1995, the U.S. Geological Survey (USGS), in cooperation with the U.S. Army Corps of Engineers (USACE), began a program to generate reconnaissance maps of the sea floor offshore of the New York - New Jersey metropolitan area and within the southern Long Island nearshoe area. Our methods include high-resolution sidescan sonar and subbottom profiling techniques, along with surface grab and vibracore sampling to verify the geophysical interpretations. The goal of the investigation is to provide a regional synthesis of the sea-floor environment, to determine regional-scale availability of sand as a resource for beach nourishment programs, and to investigate the role that inner-shelf morphology and geologic framework have in the evolution of the coastal region within the New York Bight Apex and southern Long Island. Maps derived from interpretation of the subbottom profiles show information on the geometry and distribution of the Quaternary sediments and the underlying coastal-plain unconformity. This seismic stratigraphy yields a regional framework on which explanations of present (and past) sediment movement, dispersal, and erosion processes are based.
Survey, US Geological , 2002, High-Resolution Quaternary seismic stratigraphy of the New York Bight continental shelf: US Geological Survey Open-File Report Open-File Report 02-152, US Geological Survey, Woods Hole, MA.Online Links:
NOAA, 19990000, Exposing the U.S. Coastal Zone: EOS, Transactions of the American Geophysical Union vol. 80, no. 4, NOAA, Boulder, CO.Online Links:
Lotto, Linda, 20000000, Seismic Stratigraphy and Quaternary Evolution of the New York Bight Inner Continental Shelf: Texas A&M University unpublished MS Thesis, Texas A&M University, College Station, TX.
Person who carried out this activity:
Jane F. Denny
US Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA 02543
USA
508-457-2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
Person who carried out this activity:
Jane F. Denny
US Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA 02543
USA
508-457-2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
Person who carried out this activity:
Jane F. Denny
US Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA 02543
USA
508-457-2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
Person who carried out this activity:
Jane F. Denny
US Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA 02543
USA
508-457-2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
Person who carried out this activity:
Jane F. Denny
US Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA 02543
USA
508-457-2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
Person who carried out this activity:
Jane F. Denny
US Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA 02543
USA
508-457-2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
Person who carried out this activity:
Jane F. Denny
US Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA 02543
USA
508-457-2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
Person who carried out this activity:
Jane F. Denny
US Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA 02543
USA
508-457-2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
Person who carried out this activity:
Jane F. Denny
US Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA 02543
USA
508-457-2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
Person who carried out this activity:
Jane F. Denny
US Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA 02543
USA
508-457-2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
These data are derived from 2D seismic reflection profiles that are spaced approximately 1.3 km apart in the cross track-direction. Shore perpendicular track lines were spaced about 3-4 km apart. Along track samples of the seismic profiles are approximately 1 meter assuming a ship speed of 2 meters/second. The data were downsampled in the along-track direction at an interval of about 30 meters. The horizontal resolution of the gridded data are constrained by the grid cell size of 150 meters. Horizontal interpolation is inherent in the gridding process.
DGPS is assumed to be accurate within 1-2 meters. Standard GPS is assumed accurate within 5-10 meters. 99% of the positional data is DGPS. Unless noted, all GPS/DGPS data is referenced to WGS84 (NAD83). The horizontal positioning did not account for source and receiver offsets and offset the GPS antennae and the boomer source and streamer. It is estimated that these offsets could lead to inaccuracies of about 30 m. Because the elevation of the coastal-plain unconformity was calculated by addy Quaternary thickness to a coastal elevation model //www.ngdc.noaa.gov/mgg/coastal/coastal.html), the horizontal accuracy is constrained by the reference to USGS 3-arc-second topographic data (nominal resolution of 90 meters). Offshore hydrographic positioning that is estimated to be 30 m or better closer to shore. Onshore well locations were digitized from paper maps (Sutter and others, 1949).
Vertical positioning accuracy of the offshore data is based on the seafloor reference used. coastal-plain elevation in the offshore was determined by adding Quaternary sediment thickness (derived from two-way travel time between the coastal-plain unconformity an the seafloor using an acoustic velocity of 1630 m/s) to a topographic and bathymetric elevation model //www.ngdc.nooa.gov/mgg/coastal/coastal.html). This costal elevation model is referenced to USGS 3-arc-second DEM data that has a vertical accuracy of 1 meter and NOS hydrographic data that has an accuracy of 1/10 of a meter. The entire model is referenced to mean low water or mean or low water. Onshore well elevations were taken from well logs descriptions (Sutter and others, 1949). Finally the Quaternary sediment thickness grid was calculated from the difference of the coastal-plain elevation grid and the coastal elevation model.
The gridded data are limited by horizontal resolution of the grid cell size and spatial distribution of the original point data. Higher resolution data acquisition will likely result in a more detailed representation of sediment distribution and thickness. The data also represent a time interval of the data acquisition. Attributes of elevation of the coastal-plain unconformity change very little over time.
The gridded data were checked for consistency by plotting the point data over the the grid and comparing point values with grid cell values.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints: None
Jane F. Denny
US Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA 02543
USA
508-457-2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
qiso
Altough this data set and its lineage 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 it's 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 items. Users must assume responsibility for the proper use of this data. This data should not be used at resolutions for which it is not intended. This data has no been reviewed for conformity with US Geological Survey editorial standards, or the North American Strigraphic code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the US Government.
Jane F. Denny
US Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA 02543
USA
508-457-2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov