H11255INTERP.SHP: Data Layer Containing the Features Interpreted to be on the Sea Floor within the H11255 Survey Area in Southeastern Long Island Sound (Geographic)

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Frequently-anticipated questions:


What does this data set describe?

Title:
H11255INTERP.SHP: Data Layer Containing the Features Interpreted to be on the Sea Floor within the H11255 Survey Area in Southeastern Long Island Sound (Geographic)
Abstract:
Digital terrain models (DTMs) produced from multibeam bathymetric data provide valuable base maps for marine geological interpretations. These maps help define the geological variability of the seafloor (one of the primary controls of benthic habitat diversity); improve 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 provide a detailed framework for future research, monitoring, and management activities. The bathymetric survey interpreted herein (National Oceanic and Atmospheric Administration (NOAA) survey H11255) covers roughly 95 km2 of seafloor in southeastern Long Island Sound. This bathymetry has been examined in relation to seismic reflection data collected concurrently, as well as archived seismic profiles acquired as part of a long-standing geologic mapping partnership between the State of Connecticut and the U.S. Geological Survey (USGS). The objective of this work was to use these acoustic data sets to interpret geomorphological attributes of the seafloor, and to use these interpretations to better understand the Quaternary geologic history and modern sedimentary processes.
  1. How should this data set be cited?

    U.S. Geological Survey, 2006, H11255INTERP.SHP: Data Layer Containing the Features Interpreted to be on the Sea Floor within the H11255 Survey Area in Southeastern Long Island Sound (Geographic): Open-File Report 2006-1059, 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., Moser, M.S., Stewart, H.F., Forfinski, N.A., Gardner, U.L., and Keene, J.A., 2006, Geological interpretation and multibeam bathymetry of the sea floor in southeastern Long Island Sound: Open-File Report 2006-1059, 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: -72.789269
    East_Bounding_Coordinate: -72.643386
    North_Bounding_Coordinate: 41.092616
    South_Bounding_Coordinate: 41.021306

  3. What does it look like?

    <http://pubs.usgs.gov/of/2006/1059/data/interpretation/h11255interp.gif> (GIF)
    Thumbnail image showing the location and extent of interpretations of NOAA survey H11255

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

    Beginning_Date: 19-Sep-2004
    Ending_Date: 02-Oct-2004
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

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

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • G-polygon (37)

    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 0.000000. Longitudes are given to the nearest 0.000000. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378206.400000.
      The flattening of the ellipsoid used is 1/294.978698.

  7. How does the data set describe geographic features?

    h11255interp

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    ID


    INTERPRET
    Interpreted features visible on the DTM (Source: Scientist)

    Value Definition
    anchor scar mark produced by a dragged anchor
    depression semi-isolated bathymetric low
    furrows sedimentary furrow that appears as an elongate depression
    pipeline or cable telecommunications or electrical cable or a gas pipline
    shipwreck sunken ship resting on the bottom


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?

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

    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


Why was the data set created?

To release a shape file containing the interpretation of the 2-m bathymetry generated from NOAA survey H11255 in Long Island Sound in geographic. Interpreted features on the seabed within this survey area include: sedimentary furrows, pipeline/cable, semi-isolated depressions, anchor scars, and a shipwreck.


How was the data set created?

  1. From what previous works were the data drawn?

    (source 1 of 1)
    Type_of_Source_Media: DVD
    Source_Contribution:
    The original multibeam bathymetric data acquired with a Simrad EM 1002 echosounder during NOAA cruise H11255 aboard the NOAA ship Thomas Jefferson.

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

    Date: Unknown (process 1 of 1)
    The digital terrain model was interpreted and polygons for each type of feature were produced in ArcView as a shapefiles. The shapefiles were then combined using GeoProcessing Wizard.

    Person who carried out this activity:

    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

    Data sources used in this process:
    • h11255_geo_2mbathy.tif

    Data sources produced in this process:

    • h11255interp.shp
    • h11255interp.dbf
    • h11255interp.shx

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

    Poppe, L.J., Doran, E.F., Moser, M.S., Forfinski, N.A., Gardner, U.L., Keene, J.A., Christman, E.B., and Ackerman, S.D., 2005, Distribution, character, and importance of sedimentary furrows in south-central Long Island Sound: EOS OS23B-07, American Geophysical Union, Washington, DC.


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:
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 02536
    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

  3. What legal disclaimers am I supposed to read?

    Although this data set has been used by the USGS, no warranty, expressed or implied, is made by the USGS 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 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?

  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 ESRI shapefiles.


Who wrote the metadata?

Dates:
Last modified: 19-Jul-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 Wed Jul 19 08:43:44 2006