National Geophysical Data Center Coastal Relief Model

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Frequently-anticipated questions:

What does this data set describe?
    Title: National Geophysical Data Center Coastal Relief Model
    Abstract:
    This data set includes sea floor topography of the area offshore of New York and New Jersey from the National Oceanic and Atmospheric Administration Coastal Relief Model (see <http://www.ngdc.noaa.gov/mgg/coastal/coastal.html>). The data set is derived from historical measurements of sea floor depth and is gridded at 90 m spatial resolution.

  1. How should this data set be cited?

    National Oceanographic and Atmo, National Geophysical Data Center, 2003, National Geophysical Data Center Coastal Relief Model:.

    Online Links:

    Other_Citation_Details:
    This Coastal Relief Gridded database provides the first comprehensive view of the US Coastal Zone; one that extends from the coastal state boundaries to as far offshore as the NOS hydrographic data will support a continuous view of the sea floor. In many cases, this seaward limit reaches out to, and in places even beyond the continental slope. Data sources include the U.S. National Ocean Service and the U.S. Geological Survey.
    This is part of the following larger work.

    Butman, Bradford, Gutierrez, Benjamin T., ten Brink, Marilyn Buchholtz, Schwab, William C., Blackwood, Dann S., Mecray, Ellen L., and Middleton, Tammie J., 2003, Photographs of the Sea Floor Offshore of New York and New Jersey: U.S. Geological Survey Open File Report 01-470, U.S. Geological Survey, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -74.5666614
    East_Bounding_Coordinate: -70.998985
    North_Bounding_Coordinate: 41.873091
    South_Bounding_Coordinate: 39.001819

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: 1999
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: raster digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Raster data set. It contains the following raster data types:

      • Dimensions 4127 x 4107, type Grid Cell

    2. What coordinate system is used to represent geographic features?

      The map projection used is Mercator.

      Projection parameters:
      Standard_Parallel: 40.0
      Longitude_of_Central_Meridian: -75
      False_Easting: 0
      False_Northing: 0

      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 45
      Ordinates (y-coordinates) are specified to the nearest 45
      Planar coordinates are specified in meters

      The ellipsoid used is World Geodetic System 84.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257.

      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Mean lower low water
      Depth_Resolution: 0.1 m
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates

  7. How does the data set describe geographic features?

    ngdc_20_200.shp
    Arcview shapefile with polylines (Source: ESRI)

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    ValueDefinition
    polylinefeature geometry name

    Id
    Arcview generated identification (Source: Arcview)

    Range of values
    Minimum:1702
    Maximum:19032
    Units:Arcview generated numbers

    Contour
    depth attribute of polyline (Source: data processor)

    Range of values
    Minimum:20
    Maximum:200
    Units:meters

  8. What are the components of this data set?

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    Data compiled and published by the National Geophysical Data Center, National Oceanic and Atmospheric Administration (NOAA) (see <http://www.ngdc.noaa.gov/mgg/coastal/coastal.html>).

  3. To whom should users address questions about the data?

    Brad Butman
    United States Geological Survey
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA 02543-1598

    508.457.2212 (voice)
    508.457.2309 (FAX)
    bbutman@usgs.gov

Why was the data set created?
These data are included in this publication to provide regional bathymetry on maps showing the location of images and samples obtained in the New York Bight.

How was the data set created?
  1. From what previous works were the data drawn?

    NOAA (source 1 of 1)
    National Oceanographic and Atmo, National Geophysical Data Center, 1999, Coastline Extractor: NGDC National Coastal Relief Model Volumes 1 and 2, NESDIS National Geophysical Data Center, Boulder, CO.

    Online Links:

    Other_Citation_Details:
    The first elevation grids constructed for the database formed volumes one and two of the NGDC Coastal Relief Model CD-ROM series. These volumes collectively covered an area of the US coastal zone that extends from 48° N to 31° N latitude, encompassing the land areas and surveyed offshore areas of the coastal states from Maine to Georgia. In October, 2001, volumes three, four, and five were released covering the coast of Florida and the US Gulf of Mexico coastal zone (see illustration at upper left). The gridded database will eventually encompass the coastal zone of the continental US, Alaska, Hawaii and Puerto Rico. However, the US coastal zone is being gridded in sections due to the immense volume of data involved in this project. The grids of the eastern US coastal zone (excluding Florida) are the first in a series of gridded data sets that are being compiled for the US coastal zone. The data sets are being systematically assembled proceeding clockwise around the continental US. The next datasets to be released will be of the western US coastal zone, encompassing California, Oregon and Washington, of the Great Lakes and their bordering states, and then of Alaska and the Aleutian Islands. Data sets of Hawaii and Puerto Rico will be included amongst these as well.
    Type_of_Source_Media: CD_ROM
    Source_Contribution:
    The source contributed the database from which we extracted data for the section of coastline we were interested in.

  2. How were the data generated, processed, and modified?

    Date: 2000 (process 1 of 1)
    The data for these data layers were extracted from the Geodas CDROM Volumes 1 and 2. These CD's are produced by the National Oceanic and Atmospheric Administration, National Geophysical Data Center in Boulder, CO. Spatially referenced depth values were exported into an ASCII raster file, which was then imported into Arcview Spatial Analyst to create gridded bathymetry with a cell size of 90 by 90 meters.

How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?

    Unknown

  2. How accurate are the geographic locations?

    unknown

  3. How accurate are the heights or depths?

    Unknown

  4. Where are the gaps in the data? What is missing?

    These data are known to be complete.

  5. How consistent are the relationships among the observations, including topology?

    These data are considered to be logically consistent.

How can someone get a copy of the data set?
Are there legal restrictions on access or use of the data?

Access_Constraints: None
Use_Constraints: These data are not for navigational purposes.

  1. Who distributes the data set? (Distributor 1 of 2)

    Bradford Butman
    U.S. Geological Survey
    Oceanographer
    384 Woods Hole Road
    Woods Hole, Massachusetts 02543-1598
    USA

    508.548.8700x2212 (voice)
    508.457.2309 (FAX)
    bbutman@usgs.gov

    Hours_of_Service: 8 a.m. to 5 p.m. EST
  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    These data were prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data 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.

  4. How can I download or order the data?

  1. Who distributes the data set? (Distributor 2 of 2)

    U.S. Geological Survey Information Services
    Box 25286 Denver Federal Center
    Denver, Colorado 80225-0046
    USA

    303.202.4700 (voice)
    303.202.4188 (FAX)

    Hours_of_Service: 8 a.m. to 5 p.m. Mountain Time
  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    These data were prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data 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.

  4. How can I download or order the data?

Who wrote the metadata?
Dates:
Last modified: 16-Dec-2002

Metadata author:
Brad Butman
United States Geological Survey
Oceanographer
384 Woods Hole Road
Woods Hole, MA 02543-1598

508.548.8700x2212 (voice)
508.457.2309 (FAX)
bbutman@usgs.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

Generated by mp version 2.7.3 on Wed Jun 25 09:12:28 2003