Attribute_Accuracy_Report:
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 100 meters. Horizontal interpolation
is inherent in the gridding process.
The gridded data were checked for consistency by plotting the
point data over the the grid and comparing point values with grid
cell values.
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 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.
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). 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 adding 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_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
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 and
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
sea level. Onshore well elevations were taken from well
logs descriptions (Sutter and others, 1949).
Source_Information:
Source_Citation:
Citation_Information:
Originator: NOAA
Publication_Date: 1999
Title: Exposing the U.S. Coastal Zone
Edition: 1
Geospatial_Data_Presentation_Form: model
Series_Information:
Series_Name: EOS, Transactions of the American Geophysical Union
Issue_Identification: vol. 80, no. 4
Publication_Information:
Publication_Place: Boulder, CO
Publisher: NOAA
Online_Linkage: http://www.ngdc.noaa.gov/mgg/coastal/coastal.html
Type_of_Source_Media: DVD-ROM
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1999
Source_Currentness_Reference: Publication Date
Source_Citation_Abbreviation: Coastal Relief Model
Source_Contribution:
The NOAA Coastal Relief Model was used to reference
(topograhic base) subbottom surfaces to mean sea level
Source_Information:
Source_Citation:
Citation_Information:
Originator: Linda Lotto
Publication_Date: 2000
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: 2000
Source_Currentness_Reference: Publication Date
Source_Citation_Abbreviation: Onshore Well Logs
Source_Contribution:
Well logs from the New York State Department of
Conservation and the USGS were analyzed by Lotto (2000)
to determine the elevation of the coastal-plain
unconformity on land.
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:
Gridded Elevation of coastal-plain
Unconformity
Edition: 1
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 1999-559
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Online_Linkage: https://pubs.usgs.gov/of/1999/of99-559/
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:
Gridded elevation of the coastal-plain Unconformity
along nearshore off southern Long Island (Fire Island -
Montauk)
Source_Contribution:
These data were combined with the grid of the elevation
of the Coastal plain unconformity within the New York
Bight (west of the Long Island area) in order to
generate a composite grid of the elevation of the
Coastal plain unconformity within the inner-continental
shelf of the New York Bight.
Process_Step:
Process_Description:
Processed SEG-Y seismic data and associated shot
navigation data acquired within the New York Bight,
were loaded into Landmark Seisworks interpretation
software. The coastal-plain unconformity 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 nearshore Quaternary sediment
thickness. These data were exported from seisworks to
an 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:
The ASCII point data were imported to Dynamic Graphics
Inc., EarthVision surface modelling software. The
points representing Quaternary sediment thickness were
gridded with a 200 meter grid cell size. Bathymetric
data that were collected the same time as the seismic
profile data were gridded using a 150 m grid cell size.
The Quaternary sediment thickness grid was addded to
the bathymetric grid to yield a grid for the nearshore
elevation of the Coastal plain unconformity reference
to mean sea level.
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:
The exported ASCII file from the nearshore coastal-plain unconformity elevation was combined with onshore
well elevations of the coastal-plain unconformity.
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:
The total onshore and nearshore coastal-plain
unconformity elevations were imported into EarthVision.
The data were gridded at a 200 m grid spacing.
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:
The resultant grid represented the onshore and offshore
elevation of coastal-plain unconformity for all of Long
Island and the inner-shelf region from the New Jersey
coast to Long Beach. A grid of the elevation of the
Coastal plain unconformity along the nearshore of
southern Long Island was generated in a study published
in 1999 (USGS Open-File Report, 00-243). To generate a
composite grid of the elevation of the Coastal plain
unconformity, the two grids were merged within
EarthVision, using the union command. Minor edits were
required at the boundaries of the union.
Process_Date: 20011101
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 coastal-plain unconformity elevation
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).
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:
The edited ASCII grid file was imported into ArcView
software with the Spatial Analyst extension. The
file was saved as an ArcInfo raster grid format.
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:
Contour data were generated from the coastal-plain Unconformity Gridded data at a 5 meter
contour interval within EarthVision. These data were exported and converted to an
ESRI generate format. The contour interval associated with each contour was saved as an
ASCII file and read into ArcView in table format. The generate file was converted to a
vector shapefile. The table and attritube table of the contour shapefile were joined based
on unique contour IDs. The attribute table was then editted to include the associated contour
value with each contour line, and the join was removed. The 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
Process_Step:
Process_Description:
The resultant grid and contour data were clipped to the 1995 and 1996 survey extents
and all of Long Island using GRIDCLIP script within ArcView 3.2.
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
Process_Step:
Process_Description:
Edits to the metadata were made to fix any errors that MP v 2.9.36 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). Completely changed the title based on an author (Jane Denny) supplied title. Added online links to the publication and data page in the Identification section. Added the standard order section to the Distribution Information, which included providing a link to download the data. The metadata describes both the grid and the contours, but the contours are the only dataset available for download in a zip file from the publication. Downloading the grid would require downloading individual files within folders. Fixed a source citation online link. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent.
Process_Date: 20171222
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description: An error was fixed in one of the originator names.
Process_Date: 20180130
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description: USGS Thesaurus keywords added to the keyword section.
Process_Date: 20180720
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description: Crossref DOI link was added as the first link in the metadata.
Process_Date: 20191118
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description:
Added keywords section with USGS persistent identifier as theme keyword.
Process_Date: 20200908
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
