Alaska map quadrangles at 1:250,000 scale

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Frequently anticipated questions:


What does this data set describe?

Title: Alaska map quadrangles at 1:250,000 scale
Abstract:
Outlines of 1:250,000 scale map quadrangles in Alaska for use as a geographic reference within Google Earth or other software capable of interpreting KML, with links to additional mineral resource-related geoscientific information produced by USGS.
  1. How might this data set be cited?
    U.S. Geological Survey, 2010, Alaska map quadrangles at 1:250,000 scale.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -178.000000
    East_Bounding_Coordinate: 178.000000
    North_Bounding_Coordinate: 72.000000
    South_Bounding_Coordinate: 51.250000
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  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-polygons (154)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitude and longitude values are specified in decimal degrees. The horizontal datum used is World Geodetic System 1984.
      The ellipsoid used is WGS 84.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257.
  7. How does the data set describe geographic features?

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • U.S. Geological Survey
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Schweitzer, Peter, N
    Eastern Mineral and Environmental Resources Science Center
    12201 Sunrise Valley Drive Mail Stop 954
    Reston, VA
    USA

    703-648-6533 (voice)
    pschweitzer@usgs.gov

Why was the data set created?

Provide general geographic reference for users of specific GIS applications, including those able to interpret KML.

How was the data set created?

  1. From what previous works were the data drawn?
    ADNR (source 1 of 1)
    Alaska Department of Natural Resources - Information Resource Management Section, 1993, USGS 1:250,000 Alaska Quadrangle Boundaries.

    Type_of_Source_Media: Vector digital data
    Source_Scale_Denominator: 250000
    Source_Contribution:
    Quadrangle boundaries obtained from this source; derivative KML contains additional links to geographic catalog on https://mrdata.usgs.gov/general/
  2. How were the data generated, processed, and modified?
  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?
  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: none
  1. Who distributes the data set? (Distributor 1 of 1)
    Schweitzer, Peter, N
    Eastern Mineral and Environmental Resources Science Center
    12201 Sunrise Valley Drive Mail Stop 954
    Reston, VA
    USA

    703-648-6533 (voice)
    pschweitzer@usgs.gov
  2. What's the catalog number I need to order this data set? ak250
  3. What legal disclaimers am I supposed to read?
    This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards (or with the North American Stratigraphic Code). 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?

Who wrote the metadata?

Dates:
Last modified: 07-Dec-2016
Metadata author:
Schweitzer, Peter, N
Eastern Mineral and Environmental Resources Science Center
12201 Sunrise Valley Drive Mail Stop 954
Reston, VA
USA

703-648-6533 (voice)
pschweitzer@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://mrdata.usgs.gov/metadata/ak250.faq.html>
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