Citation:
Citation_Information:
Originator: U.S. Geological Survey and the Department of Interior
Publication_Date: 2012
Title:
Airborne geophysical survey: Selway-Bitterroot, Idaho and Montana
Geospatial_Data_Presentation_Form: analog contour map
Online_Linkage:
Description:
Abstract:
Aeromagnetic data were collected along flight lines by instruments in an
aircraft that recorded magnetic-field values and locations. In the earlier
days of surveying, the only way to represent this data was to generate an
analog map with contour lines. This dataset is a representation of the
digitized contour lines either by following the lines or by choosing the
intersection of the contour and flight-line to create a value of the magnetic
field. The values presented are latitude, longitude, and map magnetic-field
values.
Purpose:
Aeromagnetic surveys are used for geophysical prospecting. Some variations in
magnetic measurements are caused by rocks that contain significant amounts of
magnetic minerals (magnetite being the most common). These anomalies reflect
variations in the amount and type of magnetic material and the shape and depth
of the body of rock. The features and patterns of aeromagnetic anomalies can
also be used to delineate details of subsurface geology including the locations
of buried faults and the thickness of surficial sedimentary rocks.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 196909
Ending_Date: 196909
Currentness_Reference:
Time period indicates dates of airborne survey
data collection. Time period is expressed in the
format YYYYMM or YYYYMMDD when further accuracy is available.
Status:
Progress: complete
Maintenance_and_Update_Frequency: none planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -115.37
East_Bounding_Coordinate: -114.16
North_Bounding_Coordinate: 46.70
South_Bounding_Coordinate: 44.50
Data_Set_G-Polygon:
Data_Set_G-Polygon_Outer_G-Ring:
G-Ring:
-114.33 46.68, -114.17 46.68, -114.17 46.25,
-114.25 46.25, -114.25 45.75, -114.50 45.75,
-114.50 44.50, -115.00 44.50, -115.00 45.75,
-115.25 45.75, -115.25 46.00, -115.38 46.00,
-115.38 46.38, -115.12 46.38, -115.12 46.50,
-114.55 46.50, -114.33 46.68
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: geophysical surveys
Theme_Keyword: aeromagnetic data
Theme_Keyword: airborne surveys
Theme_Keyword: magnetic surveys
Theme_Keyword: residual magnetic field
Theme_Keyword: total field
Theme_Keyword: magnetic
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: geophysics
Theme_Keyword: geospatial datasets
Theme_Keyword: magnetic field (earth)
Theme_Keyword: aeromagnetic surveying
Theme_Keyword: field monitoring stations
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: United States
Place_Keyword: Idaho
Place_Keyword: ID
Place_Keyword: Montana
Place_Keyword: MT
Place_Keyword: Challis quadrangle
Place_Keyword: Elk City quadrangle
Place_Keyword: Hamilton quadrangle
Place:
Place_Keyword_Thesaurus: Common Geographic Areas
Place_Keyword: f16037 = Custer
Place_Keyword: f16049 = Idaho
Place_Keyword: f16059 = Lemhi
Place_Keyword: f16085 = Valley
Place_Keyword: f30063 = Missoula
Place_Keyword: f30081 = Ravalli
Access_Constraints: none
Use_Constraints:
none. Acknowledgement of the U.S. Geological Survey would be appreciated
in products derived from these data.
Browse_Graphic:
Browse_Graphic_File_Name:
Browse_Graphic_File_Description:
Reduced-size image depicting the data, 793 x 1419 pixels, 148,026 bytes
Browse_Graphic_File_Type: JPEG
Data_Set_Credit:
These USGS employees contributed to reformatting and archiving these data:
Viki Bankey, Pat Hill, Holly Hindle,
Bob Kucks, Sarah Shearer, Esther Castellanous
Cross_Reference:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 1972
Title:
Aeromagnetic map of part of the Hamilton and Elk City 1° by 2°
Quadrangle, Idaho
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: U.S. Geological Survey Geophysical Investigation
Issue_Identification: GP-832
Publication_Information:
Publication_Place: Denver, CO
Publisher: U.S. Geological Survey
Other_Citation_Details: map scale 1:250,000
Cross_Reference:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 1972
Title:
Aeromagnetic map of part of the Challis 1° by 2° Quadrangle, Idaho
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: U.S. Geological Survey Geophysical Investigation
Issue_Identification: GP-835
Publication_Information:
Publication_Place: Denver, CO
Publisher: U.S. Geological Survey
Other_Citation_Details: map scale 1:250,000
Cross_Reference:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 1972
Title:
Aeromagnetic map of part of the Elk City 1° by 2° Quadrangle,
Idaho-Montana
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: U.S. Geological Survey Geophysical Investigation
Issue_Identification: GP-841
Publication_Information:
Publication_Place: Denver, CO
Publisher: U.S. Geological Survey
Other_Citation_Details: map scale 1:250,000