H11321_1M_UTM19NAD83.TXT: ASCII Text File of the Original 1-m Bathymetry from National Oceanic and Atmospheric Administration (NOAA) Survey H11321 in Central Rhode Island Sound

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Frequently-anticipated questions:

What does this data set describe?

Title:
H11321_1M_UTM19NAD83.TXT: ASCII Text File of the Original 1-m Bathymetry from National Oceanic and Atmospheric Administration (NOAA) Survey H11321 in Central Rhode Island Sound
Abstract:
The United States Geological Survey (USGS) is working cooperatively with the National Oceanic and Atmospheric Administration (NOAA) to interpret the surficial geology in estuaries along the coast of the northeastern United States. The purpose of our present study is to define the sea floor morphology and sedimentary environments in an area of central Rhode Island Sound using sidescan-sonar imagery, bathymetry data, and seismic records. The mosaic, bathymetry, and their interpretations serve many purposes, including: (1) defining the geological variability of the sea floor, which is one of the primary controls of benthic habitat diversity; (2) improving our understanding of the processes that control the distribution and transport of bottom sediments and the distribution of benthic habitats and associated infaunal community structures; and (3) providing a detailed framework for future research, monitoring, and management activities. The sidescan-sonar mosaics and bathymetry images also serve as base maps for subsequent sedimentological, geochemical, and biological observations, because precise information on environmental setting is important for selection of sampling sites and for accurate interpretations of point measurements.
  1. How should this data set be cited?

    National Oceanic and Atmospheric Administration, 2008, H11321_1M_UTM19NAD83.TXT: ASCII Text File of the Original 1-m Bathymetry from National Oceanic and Atmospheric Administration (NOAA) Survey H11321 in Central Rhode Island Sound: Open-File Report 2007-1366, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    McMullen, K.Y., Poppe, L.J., Denny, J.F., Haupt, T.A., and Crocker, J.M., 2008, Sidescan-Sonar Imagery and Surficial Geologic Interpretations of the Sea Floor in Central Rhode Island Sound: Open-File Report 2007-1366, 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: -71.361501
    East_Bounding_Coordinate: -71.191922
    North_Bounding_Coordinate: 41.362353
    South_Bounding_Coordinate: 41.277103

  3. What does it look like?

    <http://pubs.usgs.gov/of/2007/1366/data/bathymetry/utm/h11321_1m_utm19nad83/h11321_1m_utm19nad83.gif> (GIF)
    Overview of the gridded UTM bathymetry for NOAA Survey H11321

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

    Beginning_Date: May 18, 2004
    Ending_Date: July 7, 2004
    Currentness_Reference: ground condition

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

  6. How does the data set represent geographic features?

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

      This is a Point data set.

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

      Planar coordinates are encoded using coordinate pair

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

  7. How does the data set describe geographic features?

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?

    Please acknowledge National Oceanic and Atmospheric Administration (NOAA) and the NOAA Ship RUDE as the originators of this data set.

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

    LCDR Todd Haupt
    National Oceanic and Atmospheric Administration
    Southeast Navigation Manager
    Office of Coast Survey, NOAA
    Charleston, SC 29405
    USA

    (843) 740-1178 (voice)
    Todd.A.Haupt@noaa.gov

Why was the data set created?

This text file contains the bathymetry data acquired during National Oceanic and Atmospheric Administration (NOAA) Survey H11321. It includes sounding data collected along track lines as well as small areas of multibeam bathymetry collected in areas of interest, gaps of no data exist between track lines. Data are recorded with 6 columns (coordinates recorded in UTM) in the order: Latitude, Longitude, Depth, Density, Shoal, and Deep. Depth is the value assigned to the grid node based on all the sounding data affecting the node and the weighing scheme. Density is the number of depth measurements affecting the node. Shoal is the shoalest depth measurement affecting the node. Deep is the deepest measurement affecting the node.

How was the data set created?

  1. From what previous works were the data drawn?

    H11321_1m_UTM19NAD83.txt (source 1 of 1)
    , Unpublished Material, H11321_1m_UTM19NAD83.txt.

    Type_of_Source_Media: DVD-ROM
    Source_Contribution: Original shallow-water multibeam bathymetry data.

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

    Date: 2004 (process 1 of 2)
    The multibeam data for this survey were acquired in XTF (extended Triton data format) and recorded digitally through an ISIS data acquisition system. An Odom Echotrac DF3200 MKII dual-beam echo sounder operating at 24 and 200 kHz acquired the sounding data. In areas of interest, shallow-water multibeam echo-sounder data were acquired with a Reson SeaBat 8125 operating at 455 kHz. Once digitally recorded, the XTF data were processed using CARIS HIPS/SIPS software to quality control the data and to incorporate sound velocity and tidal corrections. Data were gridded to 1m where collected, gaps exist between tracklines; vertical datum is mean lower low water, X and Y units are meters, UTM zone 19, NAD83. Data are recorded with 6 columns in the order: Latitude, Longitude, Depth, Density, Shoal, and Deep. Depth is the value assigned to the grid node based on all the sounding data affecting the node and the weighing scheme. Density is the number of depth measurements affecting the node. Shoal is the shoalest depth measurement affecting the node. Deep is the deepest measurement affecting the node.

    Person who carried out this activity:

    Atlantic Hydrographic Branch, NOAA
    439 West York Street
    Norfolk, VA 23510
    USA

    Data sources produced in this process:
    • H11321_1m_UTM19NAD83.txt

    Date: 2008 (process 2 of 2)
    File renamed. ArcCatalog 9.2.

    Person who carried out this activity:

    Katherine McMullen
    U.S. Geological Survey
    Sediment Lab Technician
    384 Woods Hole Road
    Woods Hole, MA 02543
    USA

    (508) 540-8700 x2277 (voice)
    (508) 457-2310 (FAX)
    kmcmullen@usgs.gov

    Data sources used in this process:
    • H11321_1m_UTM19NAD83.txt

    Data sources produced in this process:

    • h11321_1m_utm19nad83.txt

  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?

    Navigation was by differential GPS

  3. How accurate are the heights or depths?

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

    All collected data were processed and used to produce this dataset.

  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:
Data are not to be used for navigation purposes. Public domain data are freely redistributable with proper metadata and source attribution. Please recognize the National Oceanic and Atmospheric Administration (NOAA) as the source of this information.

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

    Lawrence Poppe
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543
    USA

    (508) 548-8700 x2314 (voice)
    (508) 457-2310 (FAX)
    lpoppe@usgs.gov

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

    Downloadable Data: ASCII text file of the 1-m gridded bathymetry of NOAA Survey H11321

  3. What legal disclaimers am I supposed to read?

    Although this data set has been used by the USGS and NOAA, no warranty, expressed or implied, is made by the USGS or NOAA 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 or NOAA in the use of these data or related materials.

  4. How can I download or order the data?

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

    The user must have a program capable of reading and processing ASCII formated XYZ data files.

Who wrote the metadata?

Dates:
Last modified: 11-Jan-2008
Metadata author:
U.S. Geological Survey
c/o Katherine McMullen
Sediment Lab Technician
384 Woods Hole Road
Woods Hole, MA 02543
USA

(508) 548-8700 x2277 (voice)
(508) 457-2310 (FAX)
kmcmullen@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 Fri Jan 11 13:01:42 2008