USGS Home
Contact USGS
Search USGS

Mineral Resources > Online Spatial Data

Aerial Gamma-Ray Surveys in Alaska

Frequently anticipated questions:

• What does this data set describe?
  1. How should this data set be cited?
  2. What geographic area does the data set cover?
  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?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  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 data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How should 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:

   • <http://pubs.usgs.gov/of/of01-128/>

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?

   <http://pubs.usgs.gov/of/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?

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: <http://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 80225
   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:

   • <http://pubs.usgs.gov/of/of01-128/>

   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 Spacial 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 80225
   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:

   • <http://pubs.usgs.gov/of/1999/ofr-99-0016/>

   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 20192-0002
   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?
   • Availability in digital form:

     Data format:	Flight-line gamma-ray observations in format Geosoft database (.gdb) Size: 1000 megabytes
     Network links:	<http://pubs.usgs.gov/of/2001/of01-128/Data/GDB/AKfltlin.gdb>

     Data format:	Gridded geophysical parameters in format Geosoft grid (.grd) Gridded data in .grd file, georeference information in .grd.gi file by the same name
     Network links:	<http://pubs.usgs.gov/of/2001/of01-128/Data/GRD/AKMagMrg.GRD> <http://pubs.usgs.gov/of/2001/of01-128/Data/GRD/kfilt.grd> <http://pubs.usgs.gov/of/2001/of01-128/Data/GRD/thfilt.grd> <http://pubs.usgs.gov/of/2001/of01-128/Data/GRD/tcfilt.grd> <http://pubs.usgs.gov/of/2001/of01-128/Data/GRD/ufilt.grd>

   • Cost to order the data: none

Who wrote the metadata?

Dates:

Last modified: 24-Nov-2009

Metadata author:

Robert P. Kucks
U.S. Geological Survey
Operational Geologist
Box 25046, MS 964
Denver Federal Center
Denver, CO 80225
USA

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

Metadata standard:

Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)