Aerorad data

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 2016
Title: Aerorad data
Geospatial_Data_Presentation_Form: raster digital data
Larger_Work_Citation:
Citation_Information:
Originator: Susan M. Karl (ed.)
Originator: James V. Jones, III (ed.)
Originator: Timothy S. Hayes (ed.)
Publication_Date: 2016
Title:
GIS-based identification of areas that have resource potential for critical minerals in six selected groups of deposit types in Alaska
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: 2016-1191
Other_Citation_Details:
The larger work includes data sets for mineral resource data, geochemistry (stream sediment, rock, soil, mineral, and heavy mineral concentrate), igneous rock geochemical indices, lithology, and aeroradiometric data.
Online_Linkage: http://dx.doi.org/10.3133/ofr20161191
Description:
Abstract:
Includes three raster files with data for thorium, uranium, and thorium/potassium ratios from aerial gamma-ray surveys in Alaska. Data was originally collected by contractors for the U.S. Department of Energy as part of the National Uranium Resource (NURE) program during the summer months of 1975, 1976, 1977, 1979, and 1980. For most of the surveys, the flight line spacings are 10km and the lines are oriented east-west. The nominal altitude of the aircraft above the ground was 122 meters. The U.S. Geological Survey processed these data to correct scaling differences between surveys and to convert count rate data to concentration values for potassium, uranium, and thorium. The processed data were used to calculated grids with 5km grid cells.
Purpose:
Aerial gamma-ray surveys capture the radioactive signatures of bedrock and surficial materials. The surveys measured the flux of gamma rays emitted as a result of the radioactive decay of the naturally occurring radioactive elements 40K, 238U, and 232Th. In this study, the processed data is used in the analyses for REE-Th-Y-Nb, sandstone uranium, and Sn-W-Mo in specialized granite deposit models.
Supplemental_Information:
The aerial gammy-ray surveys were originally published in Duval, Joseph S., 2001, Aerial gamma-ray surveys in Alaska: U.S. Geological Survey Open-File Report 01-128. http://pubs.usgs.gov/of/2001/of01-128/
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1976
Ending_Date: 1980
Currentness_Reference: The aerial surveys were flown in 1976, 1977, 1979, and 1980.
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Unknown
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -168.3
East_Bounding_Coordinate: -129.9
North_Bounding_Coordinate: 71.4
South_Bounding_Coordinate: 54.6
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: NURE
Theme_Keyword: National Uranium Resource Evaluation
Theme_Keyword: gamma-ray
Theme_Keyword: potassium
Theme_Keyword: uranium
Theme_Keyword: thorium
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation, 008
Place:
Place_Keyword_Thesaurus: Geographic Names Information System
Place_Keyword: Alaska
Access_Constraints: None
Use_Constraints:
None. Users are advised to read the publication text and metadata to understand the appropriate use and data limitations.
Data_Set_Credit: Joseph S. Duval and Keith Labay
Native_Data_Set_Environment:
The previously published raster data sets were converted to tif files using ESRI ArcGIS, version 10.2.
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The concentration values are estimated to be no better than about +/- 30 percent except for areas of very low concentrations. Those areas are suspected to have water at or very near the surface and the measured concentrations do not represent the rocks or soils.
Logical_Consistency_Report: Unknown
Completeness_Report:
Approximately 80 percent of Alaska is covered by aerial survey with line spacings of 10km. Less than one percent of the land surface was measured by these surveys.
Lineage:
Process_Step:
Process_Description:
The original survey data were processed to correct scaling differences between surveys and to convert count rate data to concentration values.
Source_Used_Citation_Abbreviation:
Duval, Joseph S., 1999, Aerial gamma-ray surveys of the conterminous United States and Alaska: U.S. Geological Survey Open-File Report 99-562.
Process_Date: 2000
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Joseph S. Duval
Contact_Position: Geophysicist
Contact_Address:
Address_Type: mailing address
Address: 12201 Sunrise Valley Drive Mail Stop 954
City: Reston
State_or_Province: VA
Postal_Code: 20192
Country: USA
Contact_Voice_Telephone: 703-648-6106
Contact_Electronic_Mail_Address: jduval@usgs.gov
Process_Step:
Process_Description:
Raster file thorium_potassium_ratio.tif was created by dividing the thorium raster by the potassium raster as produced by Duval, 2001.
Process_Date: 2014
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Keith Labay
Contact_Address:
Address_Type: mailing and physical
Address: 4210 University Drive
City: Anchorage
State_or_Province: AK
Postal_Code: 99508-4626
Country: USA
Contact_Voice_Telephone: 907-786-7410
Contact_Electronic_Mail_Address: klabay@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 16501
Column_Count: 22401
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: NAD_1983_Alaska_Albers
Albers_Conical_Equal_Area:
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_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 5
Ordinate_Resolution: 5
Planar_Distance_Units: kilometer
Geodetic_Model:
Horizontal_Datum_Name: NAD83
Ellipsoid_Name: GRS_1980
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257222101
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
Rasters thorium_grs.tif and uranium_grs.tif were converted from the grd files as published in Duval, 2001. The cell value is concentration of thorium or uranium in parts per million. Raster thorium_potassium_ratio.tif is the result of dividing the thorium raster by the potassium raster as published by Duval, 2001.
Entity_and_Attribute_Detail_Citation: Duval, 2001 and this data set
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing
Address:
MS902 Box 25286 Denver Federal Center
City: Lakewood
State_or_Province: CO
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: 1-888-ASK-USGS
Resource_Description: USGS Open-File-Report 2016-1191
Distribution_Liability:
This publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied or assumes any legal liability or responsibility for the accuracy, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: geotiff
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: http://dx.doi.org/10.3133/ofr20161191
Fees: none
Metadata_Reference_Information:
Metadata_Date: 20151215
Metadata_Review_Date: 20160906
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Nora Shew
Contact_Address:
Address_Type: mailing and physical
Address: 4210 University Drive
City: Anchorage
State_or_Province: AK
Postal_Code: 99508-4626
Country: USA
Contact_Voice_Telephone: 907-786-7445
Contact_Electronic_Mail_Address: nshew@usgs.gov
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

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