Aerial Gamma-Ray Surveys in Alaska

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Frequently anticipated questions:


What does this data set describe?

Title: Aerial Gamma-Ray Surveys in Alaska
Abstract:
Data generated by aerial sensing of radiation emanating from the earth's surface in Alaska provides general estimates of the geographic distribution of Uranium, Thorium, and Potassium in surficial and bedrock units throughout this area.
  1. How might this data set be cited?
    Duval, Joseph S., 2001, Aerial Gamma-Ray Surveys in Alaska: U.S. Geological Survey Open-File Report 01-128, U.S. Geological Survey, Reston, Virginia.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -174
    East_Bounding_Coordinate: -116
    North_Bounding_Coordinate: 72
    South_Bounding_Coordinate: 54
  3. What does it look like?
    https://pubs.usgs.gov/of/2001/of01-128/AKccm.jpg (JPEG)
    Gamma-ray composite-color map that combines the uranium, potassium, and thorium data as shades of red, green, and blue, respectively, 555x453 pixels, 78k bytes.
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2002
    Currentness_Reference:
    available
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: CD-ROM
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
    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 North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    AKfltlin.gdb - this database contains flight-line data for the aerial surveys.

    After completion of all corrections, grids of the various data channels were calculated using a minimum curvature algorithm and a grid cell of 5 km.

    Merged aeromagnetic anomaly data are provided in AKMagMrg.GRD.

    Gridded gamma-ray emission data are provided for Potassium (kfilt.grd), Thorium (thfilt.grd), and Uranium (ufilt.grd).
    Entity_and_Attribute_Detail_Citation: https://pubs.usgs.gov/of/2001/of01-128/Database.htm

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Joseph S. Duval
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Robert P. Kucks
    U.S. Geological Survey
    Operational Geologist
    Box 25046, MS 964
    Denver Federal Center
    Denver, CO
    USA

    (303)236-1405 (voice)
    rkucks@usgs.gov

Why was the data set created?

The grids were re-projected and geotiff images created for distribution using internet map services.

How was the data set created?

  1. From what previous works were the data drawn?
    USGS OF 01-128 (source 1 of 1)
    Duval, Joseph S., 2001, Aerial Gamma-Ray Surveys in Alaska: U.S. Geological Survey Open-File Report 01-128, U.S. Geological Survey, Reston, Virginia.

    Online Links:

    Type_of_Source_Media: CD-ROM
    Source_Contribution: contains all grids and Geosoft/Oasis maps needed for processing
  2. How were the data generated, processed, and modified?
    Date: 10-Jun-2002 (process 1 of 1)
    Reprojected original grids to Spatial Data project specifications

    Input Geosoft/Oasis map files from USGS OFR 01-128 to create color scales from original images

    Create ArcView geotiff files from new maps in Geosoft/Oasis using above input Person who carried out this activity:
    Robert P. Kucks
    U.S. Geological Survey
    Operational Geologist
    Box 25046, MS 964
    Denver Federal Center
    Denver, CO
    USA

    (303)236-1405 (voice)
    rkucks@usgs.gov
    Data sources used in this process:
    • USGS OF 01-128
  3. What similar or related data should the user be aware of?
    Saltus, Richard W., Riggle, Frederic E., Clark, Brian T., and Hill, Patricia L., 1999, Merged aeroradiometric data for Alaska: A website for distribution of gridded data and plot files: U.S. Geological Survey Open-File Report 99-16, U.S. Geological Survey, Denver.

    Online Links:

    Other_Citation_Details:
    An earlier release of generally the same raw data with modified resultant products.

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)
    Peter N Schweitzer
    USGS ER MW GD
    Geologist
    12201 Sunrise Valley Drive$Mail Stop 954
    Reston, VA
    USA

    703-648-6533 (voice)
    703-648-6252 (FAX)
    pschweitzer@usgs.gov
  2. What's the catalog number I need to order this data set? USGS Open-File Report 01-128
  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-Jun-2016
Metadata author:
Peter N Schweitzer
USGS Eastern Mineral and Environmental Resources Science Center
Geologist
12201 Sunrise Valley Drive
Reston, VA
USA

703-648-6533 (voice)
703-648-6252 (FAX)
pschweitzer@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

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