Denny, Jane F. , Foster, David S. , Swift, B. Ann , and Schwab, William C. , 20010000, Stratigraphic Framework Maps of the inner-continental shelf within the New York Bight: Grid of Elevation of Holocene Ravinement: 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.
This data set resulted from a cooperative with the US Geological Survey and 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
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.
Foster, David S. , 1999, Stratigraphic Framework Maps of the Nearshore Area of Southern Long Island, New York: Gridded Elevation of coastal-plain Unconformity: U.S. Geological Survey USGS Open-File Report, U.S. Geological Survey, Woods Hole, MA.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. DennyData sources used in this process:
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:
David S. FosterData sources used in this process:
US Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA 02543
USA
508-457-2271 (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 300 meters apart in the cross track-direction. 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 100 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). Tow fish (sidescan) position was corrected for layback using acoustic slant range measurements and fish pressure depth measurements, otherwise corrected for layback by manual inputs for slant range and fish depth. Accuracy for slant range varies with distance from the ship and the noise conditions in the water, nominally up to 30 meters is better than 2 meters. Pressure depth is accurate to .1 meter. Manual slant range can use cable out measurements or estimates based on data processing results.
Vertical positioning is not necessary to quantify thickness of sediment data. The data are referenced to the distance between the sea floor and the base of the modern sand using an acoustic velocity of 1630 m/s.
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 may and probably do change with 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
hrav
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