NY_GOME_CONTOURS: New York Bight and Gulf of Maine bathymetric contours

Frequently-anticipated questions:

• What does this data set describe?
  1. How should this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
• How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

Title:

NY_GOME_CONTOURS: New York Bight and Gulf of Maine bathymetric contours

Abstract:

This bathymetric shapefile contains 10 m contours for the continental shelf and 100 m beyond the 200 m shelf edge. The contours have been derived from the National Oceanic and Atmospheric Administration (NOAA), National Geophysical Data Center (NGDC), Coastal Relief Models volume 1 and 2.

1. How should this data set be cited?

   U.S. Geological Survey, and Paskevich, Valerie, 2003, NY_GOME_CONTOURS: New York Bight and Gulf of Maine bathymetric contours: U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Field Center, Woods Hole, MA.

   Online Links:

   • <http://pubs.usgs.gov/of/2003/of03-001/data/bathymetry/ny_gome_contours.zip>
   • <http://pubs.usgs.gov/of/2003/of03-001/data/bathymetry_ny_gome_contours.zip>

   This is part of the following larger work.

   Poppe, L.J., Paskevich, V.F., Williams, S.J., Hastings, M.E., Kelley, J.T., Belknap, D.F., Ward, L.G., FitzGerald, D.M., and Larsen, P.F., 2003, Surficial Sediment Data from the Gulf of Maine, Georges Bank, and vicinity: a GIS Compilation: Open-File Report 03-001, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Field Center, Woods Hole, MA.

   Online Links:

   • <http://pubs.usgs.gov/of/2003/of03-001>
   • <http://woodshole.er.usgs.gov/openfile/of03-001>

   Other_Citation_Details:

   Data is released via CD-ROM media. This digital publication may also be available via the web at pubs.usgs.gov

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -77.208744

   East_Bounding_Coordinate: -64.999984

   North_Bounding_Coordinate: 45.182506

   South_Bounding_Coordinate: 34.999990

3. What does it look like?

   ny_gome_contours.gif (GIF)

   Image map showing extent and distribution of data layer coverage along the US eastcoast shapefile.

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

   Calendar_Date: 07-Oct-2002

   Currentness_Reference: publication date

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

   Geospatial_Data_Presentation_Form: vector digital data

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

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • String (10489)

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

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.00001. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.
      

      Vertical_Coordinate_System_Definition:

      Altitude_System_Definition:

      Altitude_Resolution: 0.000008

      Altitude_Encoding_Method:

      Explicit elevation coordinate included with horizontal coordinates

7. How does the data set describe geographic features?

   ny_gome_contours.dbf

   Shapefile Attribute Table (Source: ESRI)

   FID

   Internal feature number. (Source: ESRI)

   Sequential unique whole numbers that are automatically generated.

   Shape

   Feature geometry. (Source: ESRI)

   Coordinates defining the features.

   elev_m

   Depth values (elevation) recorded as meter values. Depths are recorded as negative values. (Source: Valerie Paskevich)

   Range of values
   Minimum:	-4300
   Maximum:	-10
   Units:	meters
   Resolution:	10

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • U.S. Geological Survey
   • Valerie Paskevich

2. Who also contributed to the data set?

   Valerie Paskevich for creating the ArcView shapefile and NOAA/NGDC for providing the source information.

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

   Valerie Paskevich
   U.S. Geological Survey
   Information Technology Specialist
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2281 (voice)
   (508) 457-2310 (FAX)
   vpaskevich@usgs.gov
   

This data overlay is intended to provide a highly detailed bathymetric contour interval for the NY Bight and Gulf of Maine area. The bathymetric shapefile contains 10 m contours for the continental shelf and 100 m intervals beyond the 200m shelf edge. These contours will be used by the Sand and Gravel assessment project to aid in the interpretation and creation of a geologic map of the sedimentary character of the seafloor for the area.

1. From what previous works were the data drawn?

   NGDC Coastal Relief Model, East Coast, Vol 1 (source 1 of 2)

   National Geophysical Data Center, Coastal Relief Model, East Coast, Vol 1: NGDC Coastal Relief Model volume 1, National Oceanic and Atmospheric Administration, National Geophysical Data Center, Boulder, Co.

   Online Links:

   • <http://www.ngdc.noaa.gov/mgg/coastal/coastal.html>
   • <http://ols.nndc.noaa.gov/plolstore/plsql/olstore.prodspecific?prodnum=G01338-CDR-A0001>

   Type_of_Source_Media: CD-ROM

   Source_Contribution:

   The Volume 1 Coastal Relief Model was combined with Volume 2 to create a raster grid of the US northeast Atlantic.

   NGDC Coastal Relief Model, East Coast, Vol 2 (source 2 of 2)

   National Geophysical Data Center, Coastal Relief Model, East Coast, Vol 2: NGDC Coastal Relief Model volume 2, National Oceanic and Atmospheric Administration (NOAA), National Geophysical Data Center (NGDC), Boulder, CO.

   Online Links:

   • <http://www.ngdc.noaa.gov/mgg/coastal/coastal.html>
   • <http://ols.nndc.noaa.gov/plolstore/plsql/olstore.prodspecific?prodnum=G01339-CDR-A0001>

   Type_of_Source_Media: CD-ROM

   Source_Contribution:

   A subset of the Volume 2 Coastal Relief Model was combined with Volume 1 to create a raster grid of the US northeast Atlantic north of 35 deg.

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

   Date: 06-Sep-2001 (process 1 of 9)

   The desired data was extracted from the Coastal Relief Model volumes 1 & 2 in the ESRI ASCII grid format

   Person who carried out this activity:
   

   Valerie Paskevich
   U.S. Geological Survey
   Information Technology Specialist
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2281 (voice)
   (508) 457-2310 (FAX)
   vpaskevich@usgs.gov
   

   Data sources used in this process:

   • Coastal Relief Model, East Coast vol 1
   • Coastal Relief Model, East Coast vol 1

   Data sources produced in this process:

   • crmvol1.asc
   • crmvol2.asc

   Date: 06-Sep-2001 (process 2 of 9)

   The retrieved data was combined to create a PCI Remote Sensing image database and stored in a 16-bit image channel.

   Person who carried out this activity:
   

   Valerie Paskevich
   U.S. Geological Survey
   Information Technology Specialist
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2281 (voice)
   (508) 457-2310 (FAX)
   vpaskevich@usgs.gov
   

   Data sources used in this process:

   • crmvol1.asc
   • crmvol2.asc

   Data sources produced in this process:

   • bathymetry\NGDC_crm\crmvol12\crm3sec.pix

   Date: 06-Aug-2002 (process 3 of 9)

   The CRM PCI database was processed to extract a subset of the combined dataset. A 5X5 low-pass smoothing filter was applied to the image data to reduce the gridding artifacts.

   Person who carried out this activity:
   

   Valerie Paskevich
   U.S. Geological Survey
   Information Technology Specialist
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2281 (voice)
   (508) 457-2310 (FAX)
   vpaskevich@usgs.gov
   

   Data sources used in this process:

   • bathymetry\NGDC_crm\crmvol12\crm3sec.pix

   Data sources produced in this process:

   • seagrd.pix

   Date: 06-Aug-2002 (process 4 of 9)

   Two additional 16 bit channels were added to the newly created PCI database containing the data subset. The CRM data was processed to create separate land and sea image channels by replacing the values above and below the desired data level with -32768.

   Person who carried out this activity:
   

   Valerie Paskevich
   U.S. Geological Survey
   Information Technology Specialist
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2281 (voice)
   (508) 457-2310 (FAX)
   vpaskevich@usgs.gov
   

   Data sources used in this process:

   • seagrd.pix

   Data sources produced in this process:

   • seagrd.pix

   Date: 06-Aug-2002 (process 5 of 9)

   An image mask of the bathymetry data was created. The XPACE CONTOUR program was run on the CRM data to create a 100m contour segment of the original data. The CRM image was then subsetted to create a bathymtry image with values between 11-200 meters and contoured at 10m. The created contours were then thinned by 50% (VECSEL).

   Person who carried out this activity:
   

   Valerie Paskevich
   U.S. Geological Survey
   Information Technology Specialist
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2281 (voice)
   (508) 457-2310 (FAX)
   vpaskevich@usgs.gov
   

   Data sources used in this process:

   • seagrd.pix

   Data sources produced in this process:

   • seagrd.pix

   Date: 06-Aug-2002 (process 6 of 9)

   All contours greater than 200 m were removed from the 10 m contour segment to remove redundancy of the 100 m contours before combining the 10 m and 100 m contours as one segment.

   Person who carried out this activity:
   

   Valerie Paskevich
   U.S. Geological Survey
   Information Technology Specialist
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2281 (voice)
   (508) 457-2310 (FAX)
   vpaskevich@usgs.gov
   

   Data sources used in this process:

   • seagrd.pix

   Data sources produced in this process:

   • seagrd.pix

   Date: 13-Aug-2002 (process 7 of 9)

   The bathymetry contours were viewed and edited using Imageworks to verify and improve the dataset. Small contours that were believed to be artifacts of the CRM gridded data were removed. Vector segments that could be combined to produce complete polylines were joined.

   Person who carried out this activity:
   

   Valerie Paskevich
   U.S. Geological Survey
   Information Technology Specialist
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2281 (voice)
   (508) 457-2310 (FAX)
   vpaskevich@usgs.gov
   

   Data sources used in this process:

   • seagrd.pix

   Data sources produced in this process:

   • seagrd.pix

   Date: 27-Sep-2002 (process 8 of 9)

   The final bathymetry contours were exported from the PCI database to an ArcView shapefile.

   Person who carried out this activity:
   

   Valerie Paskevich
   U.S. Geological Survey
   Information Technology Specialist
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2281 (voice)
   (508) 457-2310 (FAX)
   vpaskevich@usgs.gov
   

   Data sources used in this process:

   • seagrd.pix

   Data sources produced in this process:

   • gome_contours.dbf
   • gome_contours.shp
   • gome_contours.shx

   Date: 27-Sep-2002 (process 9 of 9)

   The shapefile was projected from the original WGS84 to NAD83/GRS_1980 for consistency with other datasets.

   Person who carried out this activity:
   

   Valerie Paskevich
   U.S. Geological Survey
   Information Technology Specialist
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2281 (voice)
   (508) 457-2310 (FAX)
   vpaskevich@usgs.gov
   

   Data sources used in this process:

   • gome_contours.dbf
   • gome_contours.shp
   • gome_contours.shx

   Data sources produced in this process:

   • ny_gome_contours.dbf
   • ny_gome_contours.shp
   • ny_gome_contours.shx

1. How well have the observations been checked?

2. How accurate are the geographic locations?

   Because details of the creation of the NGDC Coastal Relief model are unknown, the accuracy of the derived bathymetric contours are unknown.

3. How accurate are the heights or depths?

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

   The data is is complete in as much as the Coastal Relief Model dataset covers the US coastal zone.

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

   No additional checks for topological consistency were performed on this data.

Are there legal restrictions on access or use of the data?

Access_Constraints: None

Use_Constraints:

The U.S. Geological Survey must be referenced as the originator of the dataset in any future products or research derived from these data.

This dataset is not to be used for navigation purposes.

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

   Valerie Paskevich
   U.S. Geological Survey
   GIS Coordinator
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2281 (voice)
   (508) 457-2310 (FAX)
   vpaskevich@usgs.gov
   

2. What's the catalog number I need to order this data set?

   Downloadable Data; National Assessment of Marine Sand and Gravel Resources: ny_gome_contours.shp

3. What legal disclaimers am I supposed to read?

   Although this data set has been used by the U.S. Geological Survey, 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. 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?
   • Availability in digital form:

     Data format:	ArcView shapefile (version 3.2) ESRI polyline shapefile Size: 40.240
     Media you can order:	CD-ROM (Density 650 Mbytes) Note: The user must have a computer system with a CD-ROM available. To browse the information contained on this CD-ROM, the user must have a current WWW browser available. The user must also have software installed on their computer to unzip the archived file.

   • Cost to order the data:

5. What hardware or software do I need in order to use the data set?

   The data is available in ArcView shapefile format. The user must have ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView, the user may utilize another GIS application package capable of importing data.

Dates:

Last modified: 18-Feb-2003

Metadata author:

Valerie Paskevich
U.S. Geological Survey
384 Woods Hole Road
Woods Hole, MA 02543-1598
USA

(508) 548-8700 x2281 (voice)
(508) 457-2310 (FAX)
vpaskevich@usgs.gov

Metadata standard:

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

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