SEAGRD.TIF: image representation of the NGDC Coastal Relief Model bathymetry for the project area

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:

SEAGRD.TIF: image representation of the NGDC Coastal Relief Model bathymetry for the project area

Abstract:

The National Geophysical Data Center assembled a gridded database referred to as the Coastal Relief Model (CRM). NGDC created the comprehensive data set by merging the US Geological Survey 3-arc-second DEMs with a compilation of hydrographic soundings covering the US East Coast. The Coastal Relief Model extends from the coastal state boundaries to as far offshore as the data will support a continuous view of the seafloor. One component of the NGDC database are 3-arc-second elevation grids. This dataset formed the basis for the creation of the Coastal Relief Model bathymetry image for the project GIS.

1. How should this data set be cited?

   U.S. Geological Survey, and Paskevich, Valerie, 2003, SEAGRD.TIF: image representation of the NGDC Coastal Relief Model bathymetry for the project area: 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/images/seagrd.zip>
   • <http://pubs.usgs.gov/of/2003/of03-001/data/images/seagrd.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: -77.75

   East_Bounding_Coordinate: -65

   North_Bounding_Coordinate: 45.25

   South_Bounding_Coordinate: 35

3. What does it look like?

   seagrd.gif (GIF)

   Image map showing extent of the CRM bathymetry along the US eastcoast shapefile for the project area.

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

   Calendar_Date: 2003

   Currentness_Reference: publication date

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

   Geospatial_Data_Presentation_Form: remote-sensing image

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 5402 x 6720 x 1, type Pixel

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

      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 0.001897
      Ordinates (y-coordinates) are specified to the nearest 0.001898
      

      The ellipsoid used is WGS1984.
      

7. How does the data set describe geographic features?

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?

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 image provides a color encoded view of the Coastal Relief Model for the project area and is used as a basemap data layer for overlaying the surficial sediment data.

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 (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=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?

   (process 1 of 3)

   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 2

   Data sources produced in this process:

   • crmvol1.asc
   • crmvol2.asc

   Date: Unknown (process 2 of 3)

   The ASCII dataset was then converted to an ESRI grid file and combined to a single ESRI grid file.

   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:

   • seagrd

   Date: 01-Feb-20032 (process 3 of 3)

   The GRID data was exported as a TIF image for inclusion in the Gulf of Maine GIS

   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
   

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 observations, including topology?

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

Access_Constraints: None

Use_Constraints: 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: seagrd.tif

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:	Tiff image, world file and an ASCII version of the metadata file in format TIFF GEOTIFF Size: 103.901
     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: 19-Feb-2003

Metadata author:

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

Metadata standard:

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

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