Color Shaded-relief TIFF Image of High-resolution Bathymetry, North Carolina, Pamlico Sound Area

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Frequently-anticipated questions:

What does this data set describe?

Title:
Color Shaded-relief TIFF Image of High-resolution Bathymetry, North Carolina, Pamlico Sound Area
Abstract:
The Neuse River Estuary in North Carolina is a broad, V-shaped water body located on the southwestern end of Pamlico Sound. This estuary suffers from severe eutrophication for which several water quality models have recently been developed to aid in the management of nutrient loading to the estuary. In an effort to help constrain model estimates of the fraction of nutrients delivered by direct ground-water discharge, continuous resistivity profile (CRP) measurements were made during the spring of 2004 and 2005. CRP is used to measure electrical resistivity of sediments, a property that is sensitive to difference in salinity of submarine ground water. The 2004 and 2005 surveys used floating resistivity streamers of 100 m and 50 m respectively. The depth penetration of the streamers is approximately 20% of the streamer length which translates to approximately 20-25 m with the 100 m streamer and 12-14 m with the 50 m streamer. These data were processed using AGI's EarthImager 2D software. CRP data enables the mapping of the extent and depth of the fresher ground water within the estuary.
  1. How should this data set be cited?

    Cross, VeeAnn A. , 2005, Color Shaded-relief TIFF Image of High-resolution Bathymetry, North Carolina, Pamlico Sound Area:.

    Online Links:

    This is part of the following larger work.

    Cross, VeeAnn A. , Bratton, John F. , Bergeron, Emile, Meunier, Jeff K. , Crusius, John, and Koopmans, Dirk, 2005, Continuous Resistivity Profiling Data from the Upper Neuse River Estuary, North Carolina, 2004-2005: Open-File Report 2005-1306, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -77.098973
    East_Bounding_Coordinate: -75.464678
    North_Bounding_Coordinate: 35.857168
    South_Bounding_Coordinate: 34.694708

  3. What does it look like?

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

    Calendar_Date: 2005
    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 4299 x 4934 x 1, type Pixel

    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 0.000010. Longitudes are given to the nearest 0.000010. 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.

  7. How does the data set describe geographic features?

    Band_1

    ObjectID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Value

    Red

    Green

    Blue

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?

    This original grid dataset was acquired from the NOAA NOS Estuarine Bathymetry website: <http://spo.nos.noaa.gov:16080/bathy/>.

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

    VeeAnn A. Cross
    U.S. Geological Survey
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700 x2251 (voice)
    (508) 457-2310 (FAX)
    vatnipp@usgs.gov

Why was the data set created?

To provide high resolution bathymetry TIFF image for the Pamlico Sound area in North Carolina.

How was the data set created?

  1. From what previous works were the data drawn?

    (source 1 of 1)
    NOAA National Ocean Service, 2000, Estuarine Bathymetry: National Oceanic and Atmospheric Administration, Silver Spring, MD.

    Online Links:

    Other_Citation_Details: website
    Type_of_Source_Media: website
    Source_Contribution:
    A thorough metadata file generalized for the generic bathymetric digital elevation model is available from the website. What follows is the text supplied on the NOAA website regarding these data: The high resolution bathymetric data are gridded to 30m cells defined on a UTM projection where the locations of the value for each cell are at coordinates in UTM meter units evenly divisible by 30. The origin of these units is 500,000 meters west of the central meridian for the UTM projection and the equator. It should be noted that these UTM grids do NOT align with geographic parallels and meridians which define the extents of these DEM data sets. These 30m gridded data are equivalently referred to as UTM, 7.5 minute, or 30m data. In this context these terms are interchangeable.

    Null values (encoded -32767 within the DEMs) are used to represent all locations either above (outside) the local high water datum (the shoreline as defined by the National Ocean Service) or outside the extents of the estuary as delineated by the CAF.

    Bathymetric elevations within these data sets are referenced to the local tidal datum which typically is Mean Lowest Low Water (MLLW) averaged over a 19 year tidal epoch. Elevations above this datum (between the datum and the shoreline) have positive values (meters to centimeter resolution) while those below are negative. Note that this datum is different from that used by USGS for land elevation data that it distributes in DEM form which are referenced to Mean Sea Level (MSL).

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

    (process 1 of 4)
    A hillshade relief grid was created from the estuary bathymetry grid using ArcGIS 9.0. The parameters were left at the default values, except vertical exaggeration was set to 25. Both the bathymetry grid and the resulting hillshade grid were UTM, Zone18, NAD83.

    Data sources used in this process:

    • neuse_bathy (ESRI grid)

    Data sources produced in this process:

    • est_hsh_v25

    (process 2 of 4)
    Both the bathymetry grid and the hillshade grid were loaded into ArcView 3.3. After creating the desired color table for the bathymetry grid, the two grids were combined using the ArcView 3.3 extension "grid-to-image converter tool" (downloaded from www.esri.com). This resulted in a color shaded-relief TIFF image and the corresponding world file.

    Data sources used in this process:

    • neuse_bathy
    • est_hsh_v25

    Data sources produced in this process:

    • neuse_bathy_v25.tif
    • neuse_bathy_v25.tfw

    (process 3 of 4)
    The UTM, Zone18, NAD83 TIFF image was reprojected to geographic coordinates, NAD83 using BlueMarble Geographic Transformer version 5.1. The central latitude for the reprojection was 35.278313888888.

    Data sources used in this process:

    • neuse_bathy_v25.tif
    • neuse_bathy_v25.tfw

    Data sources produced in this process:

    • estuaryimg_geog.tif
    • estuaryimg_geog.tfw

    (process 4 of 4)
    The original 24-bit image was saved as a paletted 8-bit tiff image using Corel PhotoPaint version 11.

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

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 observations, including topology?

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 should not be used for navigation purposes.

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

    VeeAnn A. Cross
    U.S. Geological Survey
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700 x2251 (voice)
    (508) 457-2310 (FAX)
    vatnipp@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?

    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 published in this report have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and/or the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials.

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 05-Dec-2005
Metadata author:
VeeAnn A. Cross
U.S. Geological Survey
Marine Geologist
384 Woods Hole Rd.
Woods Hole, MA 02543-1598

(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)
vatnipp@usgs.gov

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

Generated by mp version 2.8.6 on Mon Dec 05 13:45:46 2005