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Connecticut Eelgrass Beds 2006 Poly

Frequently-asked questions:

What does this data set describe?

Connecticut Eelgrass Beds 2006 Poly

This data layer was created by the USFWS National Wetlands Inventory, Region 5.  Delineations of 2006 eelgrass beds were completed on the eastern Connecticut shoreline to the Rhode Island border.  Fisher Island, Plum Island, and the northern shore of Long Island, New York were also included in this work.  Spring 2006 True Color aerial photography was taken at a scale of 1:20,000 and used for detemining location and delineation of eelgrass beds.  Extensive field work was conducted by the USFWS Region 5 Southern Coastal Zone program in September, October and November, with 290 field sites. The 2006 photography was scanned and geo-rectified using 2004 ADS 1/2 meter true color imagery.

  1. How should this data set be cited?

    USFWS NWI Region 5, Unknown, Connecticut Eelgrass Beds 2006 Poly.

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

    Bounding coordinates:
    West: -72.483019
    East: -71.873644
    North: 41.380907
    South: 41.152040

  3. What does it look like?

    http://www.cteco.uconn.edu/metadata/dep/browsegraphic/eelgrassbed2006fullview.gif (GIF)
    Full view

    http://www.cteco.uconn.edu/metadata/dep/browsegraphic/eelgrassbed2006detailview.gif (GIF)
    Detail view

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

    Calendar date: 6/16/06
    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 (176)

    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?

    Connectcut Eelgrass Beds 2006 Poly
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    Area of polygon

    numeric site #

    Approximate location based adjacent areas

    Watershed numeric value

    signatures of interpreted eelgrass bed

    Patches, Dark Grn
    Patches, Grn/Brn
    Patches, Light Grn
    Solid, Dark Grn
    Solid, Dark Grn/Brn
    Solid, Dark Grn/Blk
    Solid, Grn/Brn
    Solid, Light Grn

    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

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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?

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

    Ralph Tiner
    U.S. Fish & Wildlife Service, Northeast Region
    National Wetlands Inventory, R5 Coordinator
    300 Westgate Center Drive
    Hadley, Massachusetts 01035

    413-253-8620 (voice)
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Why was the data set created?

This dataset was developed for an ongoing eelgrass monitoring of the Long Island Sound.  Funding was provided by the EPA, Region 2. 

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How was the data set created?

  1. Where did the data come from?

    Type of source media: True Color photography
    Source scale denominator: 1:20,000
    Source contribution:
    Sames W. Sewall 
    136 Center Street, P.O. Box 433 
    Old Town, Maine 04468-0433 
    207 827 4456
    fax: 207 827 3641

  2. What changes have been made?

    Date: Dec '06 - Feb '07 (change 1 of 1)
    The 2006, 1:20000 true color photography was scanned and geo-rectified to ADS 2004 true color 1/2 meter resolution imagery for Connecticut, and 1-ft resoluton  true color 2004 New York State imagery.  The 2002 eelgrass datalayer was used as a base, and polygonal data was added, subtracted or adjusted to reflect what was identified on the newer imagery.  Field work was completed using a USFWS research vessel, and USFWS personnel.  Two hundred and ninety sites were checked and documented.  This information was converted to a point datalayer and used to adjust the original delineation.

    Person responsible for change:
    Herb Bergquist
    GIS Specialist/Biologist
    413-253-8621 (voice)

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

  1. How well have the observations been checked?

    Attribute accuracy  based on quality of 1:20000 photography, and the ability to indentify submerged vegetation and the density of beds.

  2. How accurate are the geographic locations?

    Based on photography, and the abiltiy to identify eelgrass beds and delineate them from 1:20,000 True Color geo-rectified photography

  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?

    Photography was taken in one single flgiht mission on June 16, 2006

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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: no known access retrictions
Use constraints:
contraints based on limitation of methods of aquiring data through remotely sensed processes.

Distributor 1 of 1

  1. Who distributes the data set?

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

    Connectcut Eelgrass Beds 2006 Poly

  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:
Herb Bergquist
U.S. Fish & Wildlife Service
GIS Specialist/Biologist
300 Westgate Center Drive
Hadley, Massachusetts 01035

413-253-8621 (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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