Stratigraphic Framework Maps of the inner-continental shelf within the New York Bight: Holocene Thickness Grid

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Jane F. Denny
Originator: David S. Foster
Originator: William C. Schwab
Originator: B. Ann Swift
Publication_Date: 20010000
Publication_Time: Unknown
Title:
Stratigraphic Framework Maps of the inner-continental shelf within the New York Bight: Holocene Thickness Grid
Edition: 1
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Woods Hole, MA
Publisher: U.S. Geological Survey
Larger_Work_Citation:
Citation_Information:
Originator: Schwab, William C.
Originator: Denny, Jane F.
Originator: Foster, David S.
Originator: Lotto, Linda L.
Originator: Allison, Mead A.
Originator: Uchupi, Elazar
Originator: Swift, B. Ann
Originator: Danforth, William W.
Originator: Thieler, Robert E.
Originator: Butman, Bradford
Publication_Date: 2002
Title:
High-Resolution Quaternary seismic stratigraphy of the New York Bight Continental Shelf
Geospatial_Data_Presentation_Form:
Maps, remote sensing imagery, tabular digital data, and raster and vector digital data
Series_Information:
Series_Name: Open-File Report
Issue_Identification: OFR02-152
Publication_Information:
Publication_Place: Woods Hole, MA
Publisher: U.S. Geological Survey
Description:
Abstract:
These data orginate from interpretations of seismic reflection profile data. The derivative data are in a grid format and are intended to represent the thickness and distribution of Holocene deposits throughout the inner-continental shelf within the New York Bight. The gridded Holocene thickness is helpful in understanding the stratigraphic evolution of the inner-continental shelf, the regional sediment transport system, and the influence of the inner-shelf framework on coastal processes. The grid showing thickness of Holocene sediment is an important factor in the framework of the coastal region.
Purpose:
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.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19950501
Ending_Date: 19981101
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -74.06
East_Bounding_Coordinate: -71.8000
North_Bounding_Coordinate: 41.2322
South_Bounding_Coordinate: 40.15
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: geologic framework
Theme_Keyword: sand thickness
Theme_Keyword: sand resources
Theme_Keyword: sand distribution
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: New York Bight
Place_Keyword: Long Island
Place_Keyword: Atlantic Ocean
Place_Keyword: nearshore
Temporal:
Temporal_Keyword_Thesaurus: None
Temporal_Keyword: Holocene
Access_Constraints: none
Use_Constraints: none
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: US Geological Survey
Contact_Person: Jane F. Denny
Contact_Position: Geologist, Seafloor Mapping Group
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 012543
Country: USA
Contact_Voice_Telephone: 508-457-2311
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: jdenny@usgs.gov
Data_Set_Credit:
This data set resulted from a cooperative with the US Geological Survey and the US Army Corps of Engineers.

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
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. Thickness of sediment are set to zero where the base of the modern sand is not detected (below the vertical reolution of the seismic system) in the data. 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.
Logical_Consistency_Report:
The gridded data were checked for consistency by plotting the point data over the the grid and comparing point values with grid cell values.
Completeness_Report:
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.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
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_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
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.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: David S. Foster
Publication_Date: 1999
Publication_Time: unknown
Title:
Stratigraphic Framework Maps of the Nearshore Area of Southern Long Island, New York: ridded Elevation of coastal-plain Unconformity
Edition: 1
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: U.S. Geological Survey
Issue_Identification: USGS Open-File Report
Publication_Information:
Publication_Place: Woods Hole, MA
Publisher: U.S. Geological Survey
Online_Linkage: <http://woodshole.er.usgs.gov/epubs/openfiles/ofr99-559/>
Type_of_Source_Media: paper products
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1999
Time_of_Day: unknown
Source_Currentness_Reference: Publication Date
Source_Citation_Abbreviation: Modern Sand Thickness along nearshore - southern Long Island
Source_Contribution:
These data were merged with pickes of Holocene thickness within the New York Bight in order to generate a composite Holocene isopach for the region.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Linda Lotto
Publication_Date: 20000000
Publication_Time: Unknown
Title:
Seismic Stratigraphy and Quaternary Evolution of the New York Bight Inner Continental Shelf
Edition: 1
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: Texas A&M University
Issue_Identification: unpublished MS Thesis
Publication_Information:
Publication_Place: College Station, TX
Publisher: Texas A&M University
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20000000
Source_Currentness_Reference: Publication Date
Source_Citation_Abbreviation: Holocene Thickness
Source_Contribution:
Picks of Holocene Thickness were merged with Holocene thickness within the nearshore off southern Long Island in order to generate a composite Holocene thickness for the New York Bight.
Process_Step:
Process_Description:
Processed SEG-Y seismic data and associated shot navigation data acquired in 1998 within the New York Bight Apex were loaded into Landmark Seisworks interpretation software. The reflector at the base of the moderen marine sand was digitized along with the seafloor reflector. The difference in two-way travel time between horizons was calculated and converted to meters using an assumed velocity of 1630 m/s. This represents the thickness of Holocene deposits. The resolution of the CHIRP data was poor in the southeastern portion of the survey area. It was difficult to resolve Holocene deposits; the thickness of the deposit may be beyond the resolution of the system. These data were exported from seisworks to an ASCII format file.
Process_Date: 20010000
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jane F. Denny
Contact_Organization: US 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: 02543
Country: USA
Contact_Voice_Telephone: 508-457-2311
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: jdenny@usgs.gov
Process_Step:
Process_Description:
A Holocene Isopach was generated for a portion of the inner-continental shelf within the New York Bight Apex as part of an MS Degree in 1998 (Source_Information 2). The base of the Holocene was not easily resolved within the CHIRP data, and thus, there were a limited number of 'picks' to the base of the Holocene; limited data from which to generate an isopach. The Holocene Isopach was generated by hand using a 5 meter contour interval. Recently, the USGS has revisited these data in order to refine the existing Holocene Isopach. This original Holocene Isopach was digitized and imported into ArcView. The contours of Holocene thickness were converted into an ArcInfo grid file using the ArcInfo TopoGridTool. The resultant grid was then desampled by extracting grid nodes at five minute intervals along the survey tracklines. The grid was desampled in order to limit any bias in the data introduced by converting the 5 meter isopach contours to a continuous grid; i.e. to aviod imparting a higher resolution to the data than is reasonable. These data were then exported in ASCII format file.

Process_Date: 2001
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jane F. Denny
Contact_Organization: US 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: 02543
Country: USA
Contact_Voice_Telephone: 508-457-2311
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: jdenny@usgs.gov
Process_Step:
Process_Description:
ASCII point data were merged and imported to Dynamic Graphics Inc., EarthVision surface modelling software. These data were gridded at a 100 meter grid cell size, yielding 1061 rows and 1853 columns grid size. This grid was exported as an ASCII format file.

Process_Date: 1998
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jane F. Denny
Contact_Organization: US 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: 02543
Country: USA
Contact_Voice_Telephone: 508-457-2311
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: jdenny@usgs.gov
Process_Step:
Process_Description:
The exported ASCII Holocene thickness grid file from EarthVision was edited to create an ASCII grid file suitable for import to ArcView software. The order of rows were flipped, so that the file begins with the lower row, left column and ends with the upper row right column. An ArcView header that descibes the lower left origin of the grid, the grid cell size, the number of rows and columns, and the null value used (-9999).
Source_Used_Citation_Abbreviation: sandiso
Process_Date: 19990000
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jane F. Denny
Contact_Organization: US 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: 02543
Country: USA
Contact_Voice_Telephone: 508-457-2311
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: jdenny@usgs.gov
Process_Step:
Process_Description:
The edited ASCII grid file was imported into ArcView software with the 3D Spatial Analyst extension. The file was saved as a Spatial Analyst (ArcInfo raster grid format) grid.
Source_Used_Citation_Abbreviation: sandiso
Process_Date: 19990000
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: David S. Foster
Contact_Organization: US 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: 02543
Country: USA
Contact_Voice_Telephone: 508-457-2271
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: jdenny@usgs.gov
Process_Step:
Process_Description:
The resultant grid was clipped, using the GRIDCLIP script within ArcView 3.2, to the extents of the 1995 and 1996 surveys. The associated contour data (hand generated during processing step 2) are stored as an ESRI vector shapefile and fall within the 1995 and 1996 survey areas. These contour data are stored in the Geographic Coordinate System (decimal degrees, WGS84 Ellipsoid).
Process_Date: 2000
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jane F. Denny
Contact_Organization: US 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: 02543
Country: USA
Contact_Voice_Telephone: 508-457-2311
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: jdenny@usgs.gov

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 454
Column_Count: 393

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 18
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999600
Longitude_of_Central_Meridian: -075.000000
Latitude_of_Projection_Origin: +00.000000
False_Easting: 500000
False_Northing: 0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 200
Ordinate_Resolution: 200
Planar_Distance_Units: Meters
Geodetic_Model:
Horizontal_Datum_Name: WGS84
Ellipsoid_Name: WGS84
Semi-major_Axis: 6378137.0000000
Denominator_of_Flattening_Ratio: 298.26
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: North American Vertical Datum of 1988
Altitude_Resolution: 1
Altitude_Distance_Units: Meters
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates
Depth_System_Definition:
Depth_Datum_Name: Mean sea level
Depth_Resolution: 0.1
Depth_Distance_Units: Meters
Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates

Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jane F. Denny
Contact_Organization: US 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: 02543
Country: USA
Contact_Voice_Telephone: 508-457-2311
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: jdenny@usgs.gov
Resource_Description: hiso
Distribution_Liability:
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.

Metadata_Reference_Information:
Metadata_Date: 20020119
Metadata_Review_Date: 2002
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jane F. Denny
Contact_Organization: US 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: 02543
Country: USA
Contact_Voice_Telephone: 508-457-2311
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: jdenny@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Access_Constraints: None
Metadata_Use_Constraints: None

Generated by mp version 2.7.17 on Fri Apr 12 09:07:37 2002