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Connecticut Eelgrass Beds 2002 Field Data

Frequently-asked questions:

What does this data set describe?

Connecticut Eelgrass Beds 2002 Field Data

Field Verification of Eelgrass beds, located in the Long Island Sound, Eastern shore of Connecticut from Clinton Harbor to the Rhode Island State border, Fishers Island NYS and Eastern portion of the Northshore of Long Island NYS.

Supplemental information:
Visual confirmation using underwater video where eelgrass was not visible by the naked eye.  Use of photo interpreted 1:20,000 true color aerial photography was used to locate submerged aquatic vegetation prior to field work.

  1. How should this data set be cited?

    United States Fish and Wildlife Service, National Wetlands Inventory Region 5, Unpublished Material, Connecticut Eelgrass Beds 2002 Field Data.

    Online links:
  2. What geographic area does the data set cover?

    Bounding coordinates:
    West: -72.550140
    East: -71.887851
    North: 41.364791
    South: 41.017052

  3. What does it look like?

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

    Calendar date: 9/29/02
    Calendar date: 10/28/02
    Calendar date: 10/22/02
    Calendar date: 9/18/02
    Calendar date: 10/18/02
    Calendar date: 10/15/02
    Calendar date: 10/10/02
    Calendar date: 10/08/02
    Calendar date: 10/04/02
    Calendar date: 10/04/02
    Calendar date: 10/03/02
    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):
      • Entity point (246)

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

      The map projection used is Lambert Conformal Conic.

      Projection parameters:
      Lambert Conformal Conic
      Standard parallel: 41.200000
      Standard parallel: 41.866667
      Longitude of central meridian: -72.750000
      Latitude of projection origin: 40.833333
      False easting: 999999.999996
      False northing: 499999.999998

      Planar coordinates are encoded using coordinate pair.
      Abscissae (x-coordinates) are specified to the nearest 0.000250.
      Ordinates (y-coordinates) are specified to the nearest 0.000250.
      Planar coordinates are specified in survey feet.

      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:
      Altitude system definition:
      Altitude resolution: 1.000000
      Altitude encoding method: Explicit elevation coordinate included with horizontal coordinates

  7. How does the data set describe geographic features?

    Connecticut Eelgrass Beds 2002 Field Data
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    Site number given to field verification location

    Date of field verification

    Time of high tide on the day of field work

    Actual high tide height on day of field work

    Quad Name field point is located in

    Approximate esturary field point is located in

    Depth of water at time of field verification

    Eelgrass present or not present (Source: ESRI)

    Coordinates defining the features.

    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    Estimated cover H- high, M - medium,  L - low

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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?

    United States Fish & Wildlife Service, Region 5 National Wetlands Inventory

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

    Ralph Tiner
    NWI Regional Coordinator
    413-253-8620 (voice)
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Why was the data set created?

Verification of eelgrass located in the Eastern Long Island Sound and tributaries.

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How was the data set created?

  1. Where did the data come from?

  2. What changes have been made?

    Transfer of X,Y GPS coordinates into a GIS spatial database.  Attribute information was transfered manually.

    Metadata imported.

    Data sources used in this process:
    • c:\temp\xml1E.tmp

    Metadata imported.

    Data sources used in this process:
    • c:\temp\xmlF.tmp

    Dataset copied.

    Data sources used in this process:
    • K:\d_ct\d_eel_grass\fieldpoint04-03

    Dataset copied.

    Data sources used in this process:
    • D:\gis_projects\eelgrass\2002\fieldpoints

    Dataset copied.

    Data sources used in this process:
    • D:\gis_projects\CoastalResourcesGISData\fieldpoints

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How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    Point data accuaracy based in visual field interpretation.

  2. How accurate are the geographic locations?

    Base on GPS coordinates

  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?

    Based on visual confirmation of eelgrass beds,  Actual sites were based on aerial interpretation of Submerged Aquatic Vegetation SAV from True Color 1:20,000 aerial photography.

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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:
Intended as supplemental information to delineated polygonal data by the USFWS Region 5 NWI

Distributor 1 of 1

  1. Who distributes the data set?

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

    Connecticut Eelgrass Beds 2002 Field Data

  3. What legal disclaimers am I supposed to read?

  4. How can I download or order the data?

    • Availability in digital form:

    • Data format:
      in format Shapefile, Feature Class (version ArcGIS)
      Network links:http://www.ct.gov/deep

  5. Is there some other way to get the data?

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

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Who wrote the metadata?

Last modified: 20120119

Metadata author:
USFWS, National Wetlands Inventory Region 5
300 Westgate Center Drive
Hadley , Massachusetts 01035

413-253-8200 (voice)

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

Metadata extensions used:
  • http://www.esri.com/metadata/esriprof80.html

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