MV_TOPOBATH.TIF: TIF image of National Geophysical Data Center Coastal Relief Model of southeastern Massachusetts (TIF IMAGE)

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Frequently-anticipated questions:

What does this data set describe?

Title:
MV_TOPOBATH.TIF: TIF image of National Geophysical Data Center Coastal Relief Model of southeastern Massachusetts (TIF IMAGE)
Abstract:
The USGS Woods Hole Science Center conducted a nearshore geophysical survey offshore of the southern coast of Martha's Vineyard, in the vicinity of the Martha's Vineyard Coastal Observatory (MVCO) in August 2007. This mapping program was part of a larger research effort supporting the Office of Naval Research (ONR) Ripples Directed-Research Initiative (DRI) studies at MVCO by providing data collection and modeling. The geophysical mapping utilized a suite of high-resolution instrumentation including sidescan-sonar, interferometric sonar, and sub bottom profiling. These data will be used as initial conditions for wave and circulation models for the study area. Ultimately, geophysical mapping, oceanographic measurements and modeling will help to improve our understanding of coastal sediment-transport processes.

This dataset is a subset of the National Oceanic and Atmospheric Administration (NOAA), National Geophysical Data Center (NGDC) Coastal Relief Model (CRM) in which topographic data from USGS 3-arc-second digital elevation models (DEM) and Shuttle Radar Topography data (SRTM) are combined with U.S. National Ocean Service (NOS) Hydrographic database to create seamless topographic-bathymetric image along the conterminous U.S. coastal zone, Puerto Rico, and Hawaii (Divins and Metzger, 2009). The CRM provides a comprehensive view of US coastal lands and adjacent offshore waters. The offshore extent is based on the NOS data supporting a continuous view of the seafloor (www.ngdc.noaa.gov/mgg/coastasl/crm.html).

Divins, D.L., and D. Metzger, 2009, NGDC Coastal Relief Model, <http://www.ngdc.noaa.gov/mgg/coastal/coastal.html>

  1. How should this data set be cited?

    USGS, 2009, MV_TOPOBATH.TIF: TIF image of National Geophysical Data Center Coastal Relief Model of southeastern Massachusetts (TIF IMAGE): Open-File Report 2008-1288, USGS, Woods Hole.

    Online Links:

    This is part of the following larger work.

    Denny, J.F., Danforth, W.W., Foster, D.S., and Sherwood, C.R., 2009, Geophysical Data Collected off the South Shore of Marthas Vineyard, Massachusetts: USGS Open-File Report 2008-1288, USGS, Woods Hole.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -71.402790
    East_Bounding_Coordinate: -69.617190
    North_Bounding_Coordinate: 42.066654
    South_Bounding_Coordinate: 40.928368

  3. What does it look like?

    <https://pubs.usgs.gov/of/2008/1288/GIS_catalog/Basemaps/mv_topobath_sm.jpg> (JPEG)
    Thumbnail image of the southeastern Massachusetts coast and adjacent waters

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

    Calendar_Date: 2009
    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 887 x 1052 x 1, type Pixel

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

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 19
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -69.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000

      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 139.657344
      Ordinates (y-coordinates) are specified to the nearest 139.657344
      Planar coordinates are specified in meters

      The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    There are no attributes associated with a GeoTIFF image. Image pixel values contain an RGB value of the color map. The background color of the image is 255 (white).
    Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

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?

    USGS, Woods Hole Science Center

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

    Jane Denny
    USGS
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543
    USA

    508-548-8700 x2311 (voice)
    508-457-2310 (FAX)
    jdenny@usgs.gov

Why was the data set created?

These data are used to provide a regional overview of the southeastern coastline and adjacent waters offshore of Massachusetts.

How was the data set created?

  1. From what previous works were the data drawn?

    NGDC Coastal Relief Model (source 1 of 1)
    Divins, D.L., and Metzger, D., 2009, NGDC Coastal Relief Model.

    Online Links:

    Type_of_Source_Media: on-line
    Source_Scale_Denominator: 80:000
    Source_Contribution:
    The NOAA/NGDC Coastal Relief Model data set was used to create a color-encoded shaded relief topographic and bathymetric image of the study area.

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

    Date: 04-Jun-2009 (process 1 of 2)
    A 1 degree by 1 degree (70 to 71 degrees longitude and 41 and 42 degrees latitude) gridded data set was downloaded from the NOAA/NGDC Coastal Relief Model (CRM) using the online image selection at 3 arc-second resolution (90 meters) and output in an ESRI ASCII raster format (see: <http://www.ngdc.noaa.gov/mgg/coastal/crm.html>).

    Software: online access

    Person who carried out this activity:

    Jane Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700x2311 (voice)
    508-457-2310 (FAX)
    jdenny@usgs.gov

    Data sources used in this process:
    • NGDC Coastal Relief Model

    Date: 04-Jun-2009 (process 2 of 2)
    The ASCII raster grid was imported to ESRI ArcMap 9.2 using ArcCatalog's Conversion Tools, ASCII to Raster. The output data type was float and the projection was: geographic coordinate system, NAD83.

    The geographic grid was then reprojected to a UTM projection, zone 19N, WGS84 using ArcCatalog's Data Management Tools, Projections and Transformations, Raster, Project Raster. A Geographic Transformation NAD1983 to WGS1984_8 was used to transform horizontal datum from NAD83 to WGS84.

    A color map ranging from blues to greens was defined for the resulting grid within ArcMap using the Legend Classifier within VACExtras, version 1.8, in order to define multiple intervals for the classified symbology: 5 meter interval between -55 and -20 depth, 1 meter interval between -20 depths and 20 elevations, and 5 meter interval 20 to 110 meter elevations.

    A hillshade was then generated using Spatial Analyst, Surface Analyst, Hillshade feature. The parameters used were: Azimuth: 315, Altitude: 45, Z factor: 10, and output cell size: 92.499695 (default).

    The CRM grid was displayed within ArcMap with 40 percent transparency. The hillshade was displayed with the CRM grid to display a color-encoded shaded relief image of the CRM grid.

    The display of the color-encoded shaded relief image was then saved as a TIF image by using File, Export Map within ArcMap using the following parameters: 24-bit true color, no compression, write GeoTIFF Tags. This method reduced the resolution from the original 90-m grid cell size to a 135-m cell size.

    Software: ESRI ArcGIS 9.2

    Person who carried out this activity:

    Jane Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700x2311 (voice)
    508-457-2310 (FAX)
    jdenny@usgs.gov

    Data sources used in this process:
    • NRDC Coastal Relief Model

  3. What similar or related data should the user be aware of?

    Divins, D.L and Metzger, D., 2009, NGDC Coastal Relief Model.

    Online Links:

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?

    The National Geophysical Data Center (NGDC) reports that the bathymetric soundings used to generate the U.S. East Coast grids are referenced to various horizontal datum; NAD27 for soundings collected up until 1987-1988, and NAD83 for soundings collected 1988 to present. The NGDC further reports that the use of various horizontal datum does not significantly alter the accuracy of the East Coast grids because the horizontal difference between NAD27 and NAD83 is less than the horizontal resolution of the cells within the grids (< 90m).

    (<http://www.ngdc.noaa.gov/mgg/coastal/model.html>)

  3. How accurate are the heights or depths?

    The National Geophysical Data Center (NGDC) reports that the bathymetric soundings used to generate the U.S. East Coast grids are referenced to two vertical datum; mean low water (89% of the surveys) and mean lower low water (11% of the surveys). The NGDC further reports that the use of two vertical datum does not alter the accuracy of the East Coast grids because there is little difference between the elevation in mean low water and mean lower low water within the gridding region.

    (<http://www.ngdc.noaa.gov/mgg/coastal/model.html>)

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

    This image contains all topographic and bathymetric data available within the National Atmospheric and Oceanic Administration, National Geophysical Data Center, Coastal Relief Model between 71 and 70 degrees longitude and 42 and 41 degrees latitude.

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

    This image contains all topographic and bathymetric data available within the National Atmospheric and Oceanic Administration, National Geophysical Data Center, (NGDC) Coastal Relief Model between 71 and 70 degrees longitude and 42 and 41 degrees latitude. Quality control checks were performed on these data by the NGDC during generation of the Coastal Relief Model (www.ngdc.noaa.gov/mgg/coastal/crm.html)

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:
This image was generated by the USGS from the NOAA, NGDC Coastal Relief Model (www.ngdc.noaa.gov/mgg/coastal/coastal.html). Please reference the USGS in use of these data.

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

    Jane Denny
    USGS
    384 Woods Hole Road
    Woods Hole, MA 02543
    USA

    508-548-8700 x 2311 (voice)
    508-457-2310 (FAX)
    jdenny@usgs.gov

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

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. 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.

    Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 04-Oct-2009
Last Reviewed: 2009
Metadata author:
Jane Denny
U.S. Geological Survey
Geologist
384 Woods Hole Rd.
Woods Hole, MA 02543-1598

(508) 548-8700x2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov

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

Generated by mp version 2.8.25 on Sun Oct 04 07:57:18 2009