Inland St. Lawrence Island 2012 surface water detection (35% or more observations)

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What does this data set describe?

Inland St. Lawrence Island 2012 surface water detection (35% or more observations)
  1. How should this data set be cited?

    , Inland St. Lawrence Island 2012 surface water detection (35% or more observations).

    Online Links:


  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -171.966561
    East_Bounding_Coordinate: -168.651115
    North_Bounding_Coordinate: 64.045986
    South_Bounding_Coordinate: 62.767322

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  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):

      • GT-polygon composed of chains (244)

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

      The map projection used is NAD 1983 Alaska Albers.

      Projection parameters:
      Standard_Parallel: 55.0
      Standard_Parallel: 65.0
      Longitude_of_Central_Meridian: -154.0
      Latitude_of_Projection_Origin: 50.0
      False_Easting: 0.0
      False_Northing: 0.0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.0000000030536018158500163
      Ordinates (y-coordinates) are specified to the nearest 0.0000000030536018158500163
      Planar coordinates are specified in meter

      The horizontal datum used is D North American 1983.
      The ellipsoid used is GRS 1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.

  7. How does the data set describe geographic features?


    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Feature geometry. (Source: ESRI)

    Coordinates defining the features.









    Area of feature in internal units squared. (Source: ESRI)

    Positive real numbers that are automatically generated.

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Why was the data set created?

Annual hydrology product covering area 2km inland of the coastline for 2012 was exported out of the ENVI software (V.5, 2012) as raster images with all areas dichotomized into water detected (1) and solid ground detected (2) at 250 meter spatial resolution. The raster file was then converted into a vector-based format (ArcGIS shapefile) that permits computations of water and ground areas for each year and to visualize possible change detected between the two spatial means of 2 years of observations (2003 and 2012).

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Are there legal restrictions on access or use of the data?

Access_Constraints: None
Use_Constraints: None

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

    National Center for Atmospheric Research
    Attn: Earth Observing Laboratory
    3450 Mitchell Lane
    Boulder, CO 80301

    303-497-8154 (voice)

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Who wrote the metadata?

Last modified: 24-Apr-2013
Metadata author:
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

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