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LIS_SURVEYS: area outlines of the Long Island Sound sidescan sonar mosaics

Metadata also available as: OUTLINE | TEXT

Frequently-anticipated questions:


What does this data set describe?

    Title:
    LIS_SURVEYS: area outlines of the Long Island Sound sidescan sonar mosaics
    Abstract:
    Since 1982, the U.S. Geological Survey, Coastal and Marine Geology Program, has been involved in a collaborative research program with the State of Connecticut to provide long-term studies of Long Island Sound. In support of these studies, several sidescan sonar surveys were conducted within Long Island Sound. The collected sidescan data were processed to produce individual sonar mosaics of various locations within the Long (1) define the geological variability of the sea floor, one of the primary controls of benthic habitat diversity; (2) improve our understanding of the processes that control the distribution and transport of bottom sediments, benthic habitats, and associated infaunal community structures; and (3) provide a detailed framework for future research, monitoring, and management activities. The sidescan mosaics also serve as base maps for subsequent sedimentological, geochemical and biological observations because precise information on environmental setting is important to the selection of sampling sites and to the accurate interpretation of point measurements.

  1. How should this data set be cited?

    Paskevich, Valerie, 2001, LIS_SURVEYS: area outlines of the Long Island Sound sidescan sonar mosaics: U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

    Other_Citation_Details: Data are released via CD-ROM media
    This is part of the following larger work.

    Poppe, L.J., 2004, Sidescan Sonar Imagery and Surficial Geologic Interpretation of the Sea Floor off Branford, Connecticut: Open-File Report 2004-1003, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -73.341273
    East_Bounding_Coordinate: -71.863079
    North_Bounding_Coordinate: 41.319674
    South_Bounding_Coordinate: 40.981740

  3. What does it look like?

    lis_surveys (GIF)
    Image showing the extent of the GIS layer with the location and area coverages of the eight USGS Long Island Sound sidescan sonar surveys

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

    Beginning_Date: 07-Nov-1993
    Ending_Date: 17-Mar-1998
    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 (8)

    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 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?

    lis_surveys
    Shapefile Attribute Table (Source: None)

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    ID

    AREA
    Area of polygon in native units. (Source: User Defined)

    Range of values
    Minimum:0.001
    Maximum:50.295
    Units:decimal degrees
    Resolution:.001

    PERIMETER
    Perimeter of polygon in native units. (Source: User Defined)

    Range of values
    Minimum:0.217
    Maximum:51.585
    Units:decimal degrees
    Resolution:.001

    NAME
    Name used to commonly refer to mosaic/survey area. (Source: User Defined)

    Character String

    ABBREV
    Abbreviation used to refer to mosaic/survey area. (Source: User Defined)

    Character String

    YEAR
    Year of survey. (Source: User Defined)

    Character String

    YEAR2
    If a multi-year program, this field will contain the ending year of the mapping/survey activity. (Source: User Defined)

    Frequency of measurement: As needed

    ValueDefinition
    0A zero value indicates that this field activity was completed in on year. See the YEAR field for identification

    Character String

    CRUISE_ID
    Cruise identifier assigned by USGS/CMGP/WHFC. This is a historical cruise identifier that was a combination of ship name and sequential cruise number. This identifier is no longer used to identify CMGP field activities. Please see the attribute field SERIAL_NO. (Source: CMGP/WHSC Data Library)

    Character String

    SERIAL_NO
    Serial number assigned to cruise. This is a sequential number assigned by the CMGP/WHFC throughout the USGS fiscal year. (Source: CMGP/WHSC Data Library)

    ValueDefinition
    0The cruise serial number could not be idenitifed. This may be due to the fact that the survey was completed during a multi-cruise or multi-year program.

    Character String

    SSS
    Field used to indicate sidescan sonar was collected during cruise. (Source: User Defined)

    ValueDefinition
    YYES

    SB
    Field used to indicate swath bathymetry collected during cruise. (Source: User Defined)

    ValueDefinition
    YYES

    MB
    Field used to indicate multibeam echosounder data collected during survey. (Source: User Defined)

    ValueDefinition
    YYES


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?

    Valerie Paskevich, USGS, for creating the data layer.

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

    Valerie Paskevich
    U.S. Geological Survey
    Information Specialist, GIS Coordinator
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2281 (voice)
    (508) 457-2310 (FAX)
    vpaskevich@usgs.gov


Why was the data set created?

This ArcView shapefile contains the outlined areas of eight sidescan sonar mosaics produced by the U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole, MA.


How was the data set created?

  1. From what previous works were the data drawn?

    'mosaic'.pix (source 1 of 1)
    Poppe(ed.), Lawrence J. , and Polloni(ed.), Chris, 1998, Long Island Sound environmental Studies: Open-File Report 98-502, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole, MA.

    Online Links:

    Type_of_Source_Media: online
    Source_Contribution:
    Each of the completed Long Island Sound sidescan sonar mosaics were contained in separate PCI database files. These georeferenced files and images were used to trace the extent of the mosaic area.

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

    Date: 19-Dec-2000 (process 1 of 3)
    The individual, completed sidescan sonar mosaics were traced with a vector line around the extent of the mosaics. The nodes of the vector line were recorded in geographic coordinates. The vector line was closed to create a complete polygon and saved in a segment of the PCI database with the mosaic image. The saved vector segment was then exported via the PCI utility program as an ArcView shapefile. This step was repeated for all eight LIS region mosaics.

    Person who carried out this activity:

    U.S. Geological Survey
    c/o Valerie Paskevich
    Information Specialist, GIS Coordinator
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2281 (voice)
    (508) 457-2310 (FAX)
    vpaskevich@usgs.gov

    Data sources used in this process:
    • 'mosaic'.pix

    Data sources produced in this process:

    • 'mosaic'll.dbf
    • 'mosaic'll.shp
    • 'mosaic'll.shx

    Date: 19-Dec-2000 (process 2 of 3)
    The completed shapefile was brought into ArcView where the table was modified to add additional attribute fields.

    This process was repeated for each of the eight shapefiles.

    Person who carried out this activity:

    U.S. Geological Survey
    c/o Valerie Paskevich
    Information Specialist, GIS Coordinator
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2281 (voice)
    (508) 457-2310 (FAX)

    Data sources used in this process:
    • 'mosaic'.dbf
    • 'mosaic'.shp
    • 'mosaic'.shx

    Data sources produced in this process:

    • 'mosaic'll.dbf
    • 'mosaic'll.shp
    • 'mosaic'll.shx

    Date: 21-Dec-2000 (process 3 of 3)
    The individual, geographic shapefiles were combined using the ArcView extension Geoprocessing wizard to combine the individual eight files as one shapefile.

    Person who carried out this activity:

    U.S. Geological Survey
    c/o Valerie Paskevich
    Information Specialist, GIS Coordinator
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2281 (voice)
    (508) 457-2310 (FAX)

    Data sources used in this process:
    • 'mosaic'll.dbf
    • 'mosaic'll.shp
    • 'mosaic'll.shx

    Data sources produced in this process:

    • lis_surveys.dbf
    • lis_surveys.shp
    • lis_surveys.shx

  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?

    This is a subset of the U.S. Geological Survey surveys data layer that contains the location and extent of various seafloor mapping surveys and activities.

  5. How consistent are the relationships among the observations, including topology?

    No additional checks for topological consistency were performed on this dataset.


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 originator of this dataset.

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

    U.S. Geological Survey
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 (voice)
    (508) 457-2310 (FAX)

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

    Downloadable Data: lis_survys - Long Island Sound mosaic coverage areas; ArcView Shapefile

  3. What legal disclaimers am I supposed to read?

    Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data.

    Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

    The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, 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 data are available in the ESRI shapefile format. The user must have Environmental Systems Research Institute's (ESRI) ArcView 3.0 or greater or ArcGIS software to read and process the data file. In lieu of ArcView, the user may utilize another GIS application package capable of importing the data. A free GIS data viewer, ArcExplorer, is available from the ESRI website at www.esri.com/software/arcexplorer/download4.html

    Access to the data and information contained on this CD-ROM was developed using the HyperText Markup Language (HTML) utilized by the World Wide Web (WWW) project. Development of the CD-ROM documentation and user interface in HTML allows a user to access the information by using a variety of WWW information browsers to facilitate browsing and locating information and data. To access the information contained on this disk with a WWW client browser, open the file 'index.htm' at the top level directory of this CD-ROM with your selected browser.

    This CD-ROM should be readable by a variety of operating systems including Windows 95/98/NT, Macintosh and UNIX.


Who wrote the metadata?

Dates:
Last modified: 18-Feb-2004

Metadata author:
U.S. Geological Survey
c/o Valerie Paskevich
Information Specialist, GIS Coordinator
384 Woods Hole Road
Woods Hole, MA 02543-1598
USA

(508) 548-8700 x2281 (voice)
(508) 457-2310 (FAX)
vpaskevich@usgs.gov

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


Generated by mp version 2.7.33 on Wed Feb 18 11:53:09 2004