H11044_1_5M_DECIMAL_DEGREES_XYZ.TXT: Original 1.5-m Bathymetry from NOAA Survey H11044 off Milford, Connecticut

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Frequently-anticipated questions:

What does this data set describe?

Title:
H11044_1_5M_DECIMAL_DEGREES_XYZ.TXT: Original 1.5-m Bathymetry from NOAA Survey H11044 off Milford, Connecticut
Abstract:
The U.S. Geological Survey, in cooperation with the National Oceanic and Atmospheric Administration and the Connecticut Department of Environmental Protection, has produced detailed geologic maps of the sea floor in Long Island Sound, a major East Coast estuary surrounded by the most densely populated region of the United States. These studies have built upon cooperative research with the State of Connecticut that was initiated in 1982. The current phase of this research program is directed toward studies of sea-floor sediment distribution, processes that control sediment distribution, nearshore environmental concerns, and the relation of benthic community structures to the sea-floor geology. The bathymetry data in this data set were collected during 2003 for charting applications as part of NOAA project OPR-B340-RU, survey H11045 aboard the NOAA Ship RUDE. The RUDE, which supports NOAA's east-coast nautical charting mission, is outfitted to acquire single-beam bathymetry with an Odom Echotrac DF-3200 duel frequency echosounder and shallow water multibeam bathymetry with a Reson 8125 system. The Reson multibeam system operates at 455 KHz with a 120 degree across track swath and 240 beams along its swath.
  1. How should this data set be cited?

    National Oceanic and Atmospheric Administration, 2006, H11044_1_5M_DECIMAL_DEGREES_XYZ.TXT: Original 1.5-m Bathymetry from NOAA Survey H11044 off Milford, Connecticut: Open-File Report 2005-1145, 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.

    Poppe, L.J., Ackerman, S.D., Doran, E.F., Beaver, A.L., Crocker, J.M., and Schattgen, P.T., 2006, Interpolation of reconnaissance multibeam bathymetry from north-central Long Island Sound: Open-File Report 2005-1145, 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: -72.306786
    East_Bounding_Coordinate: -72.106895
    North_Bounding_Coordinate: 41.153685
    South_Bounding_Coordinate: 41.018163

  3. What does it look like?

    <http://pubs.usgs.gov/of/2005/1145/graphics/browse_graphics/h11044_geo_noaagrid.jpg> (JPEG)
    Image showing the extent of the bathymetric data from NOAA survey H11044

  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?

  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?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000000001. Longitudes are given to the nearest 0.000000001. 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.

      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Resolution: 0.000
      Altitude_Distance_Units: meters

  7. How does the data set describe geographic features?

    Latitude
    Latitude coordinate of navigation


    Range of values
    Minimum: 41.0234168
    Maximum: 41.1411507
    Units: Decimal degrees
    Resolution: 0.0000001

    Longitude
    Longitude coordinate of navigation


    Range of values
    Minimum: -73.128119
    Maximum: -72.936744
    Units: Decimal degrees
    Resolution: 0.0000001

    Depth
    Depth in meters below mean lower low water


    Range of values
    Minimum: -2.61
    Maximum: -53.22
    Units: meters
    Resolution: 0.01

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 this data set.

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

    Andrew L.Beaver
    National Oceanic and Atmospheric Administration
    Navigation Manager
    27 Tarzwell Drive
    Narragannsett, RI 02882
    USA

    401-782-3252 (voice)
    401-782-3292 (FAX)
    andrew.l.beaver@noaa.gov

Why was the data set created?

To release the original 1.5-m uninterpolated gridded bathymetry generated from NOAA survey H11044 in Long Island Sound off Milford, Connecticut.

How was the data set created?

  1. From what previous works were the data drawn?

    h11044_1_5m_decimal_degrees_xyz.txt (source 1 of 1)
    , Unpublished Material, H11044 Bathymetry.

    Type_of_Source_Media: DVD-ROM
    Source_Contribution:
    Original raw, unprocessed shallow-water multibeam and single beam bathymetric data. Areas of no data between many of the ship's tracks.

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

    Date: 2002 (process 1 of 1)
    The multibeam data for this survey was 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
    Atlantic Hydrographic Branch, NOAA
    Norfolk, VA 23510
    USA

    Data sources produced in this process:
    • h11044_1_5m_decimal_degrees_xyz.txt

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

    McMullen, K.Y., Poppe, L.J., Paskevich, V.F., Doran, E.F., Moser, M.S., Christman, E.B., and Beaver, A.L., 2005, Surficial Geologic Interpretation and Sidescan Sonar Imagery of the Sea Floor in West-Central Long Island Sound: Open-File Report 2005-1018, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

    • http:/pubs.usgs.gov/of/2005/1018

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 for navigation purposes.

Public domain data are freely redistributable with proper metadata and source attribution. Please recognize the National Oceanic and Atmosperic Administration (NOAA) and the U.S.Geological Survey (USGS) as the sources of this information.

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

    U.S. Geological Survey
    c/o Larry Poppe
    Geologist

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

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

    Downloadable Data: 1.5 m gridded bathymetry of NOAA survey H11044

  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: 26-Jan-2006
Metadata author:
U.S. Geological Survey
c/o Larry Poppe
Geologist
384 Woods Hole Road
Woods Hole, MA 02543
USA

508-548-8700 x2314 (voice)
508-457-2310 (FAX)
lpoppe@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 Thu Jan 26 07:51:38 2006