H11310_WGS84: 1-m Bathymetric ArcRaster Grid of NOAA Survey H11310 in Central Narragansett Bay in Geographic

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Frequently-anticipated questions:

What does this data set describe?

Title:
H11310_WGS84: 1-m Bathymetric ArcRaster Grid of NOAA Survey H11310 in Central Narragansett Bay in Geographic
Abstract:
The United States Geological Survey (USGS) is working cooperatively with the National Oceanic and Atmospheric Association (NOAA) to interpret the surficial geology in estuaries along the coast of the northeastern United States. The purpose of our present study is to interpret the distributions of surficial sediments and sedimentary environments in an area of Narragansett Bay using sidescan sonar imagery, high-resolution bathymetry, and sediment data. The mosaic and bathymetry presented herein covers an area of the sea floor in central Narragansett Bay. 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?

    U.S. Geological Survey, 2007, H11310_WGS84: 1-m Bathymetric ArcRaster Grid of NOAA Survey H11310 in Central Narragansett Bay in Geographic: Open-File Report 2006-1199, 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., Signell, R.P., Denny, J.F., Crocker, J.M., Beaver, A.L., and Schattgen, P.T., 2007, Surficial Geology in Central Narragansett Bay, Rhode Island: Interpretations of Sidescan Sonar and Multibeam Bathymetry: Open-File Report 2006-1199, 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: -71.422673
    East_Bounding_Coordinate: -71.285084
    North_Bounding_Coordinate: 41.594775
    South_Bounding_Coordinate: 41.523984

  3. What does it look like?

    <http://pubs.usgs.gov/of/2006/1199/data/bathymetry/geo/h11310_wgs84_grid/h11310_wgs84.gif> (GIF)
    Overview of 1-m bathymetric grid of NOAA survey H11310 in geographic

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

    Calendar_Date: 2004
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: raster digital data

  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 6311 x 12266 x 1, type Grid Cell

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

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitude and longitude values are specified in Decimal degrees.

      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.

      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 NOAA and the NOAA Ship RUDE as the originators of the data from which this data set was derived.

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

    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

Why was the data set created?

To release a geographic version of the 1-m bathymetry ArcRaster grid generated from NOAA survey H11310 in Central Narragansett Bay, Rhode Island.

How was the data set created?

  1. From what previous works were the data drawn?

    H11310_1m_UTM19NAD83.txt (source 1 of 1)
    National Oceanic and Atmospheric Administration, H11310_1m_UTM19NAD83.txt.

    Type_of_Source_Media: DVD-ROM
    Source_Contribution: Original processed shallow-water multibeam bathymetric data

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

    Date: 2004 (process 1 of 3)
    The multibeam data for this survey were acquired in XTF (extended Triton data format) and recorded digitally through an ISIS data acquisition system. 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 1 m; vertical datum is mean lower low water.

    Person who carried out this activity:

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

    Data sources produced in this process:
    • H11310_1m_UTM19NAD83.txt

    Date: 2006 (process 2 of 3)
    The original multibeam data sets, which are in ASCII comma-delimited text, were transformed into a GeoTIFF representation to read easily into ArcGIS programs. A geographic grid was interpolated from the UTM grid using bilinear interpolation.

    Person who carried out this activity:

    U.S. Geological Survey
    c/o Richard Signell
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543
    USA

    (508) 548-8700 x2229 (voice)
    (508) 457-2310 (FAX)
    rsignell@usgs.gov

    Data sources used in this process:
    • H11310_1m_UTM19NAD83.txt

    Data sources produced in this process:

    • kate_1m_geo.tif

    Date: 2006 (process 3 of 3)
    Depths were multiplied by -1 to reflect position below sea level using ArcGIS raster calculator, data was exported as a grid.

    Person who carried out this activity:

    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

    Data sources used in this process:
    • kate_1m_geo.tif

    Data sources produced in this process:

    • h11310_wgs84

  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 the 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 for navigation purposes. Public domain data are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.

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

    Larry 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: 1-m bathymetric grid from NOAA survey H11310 in geographic

  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 similar to ArcGIS that is capable of reading and processing the data files.

Who wrote the metadata?

Dates:
Last modified: 14-Nov-2006
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 Tue Nov 14 08:42:43 2006