Airborne geophysical survey: Taylor Mountains

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 2004
Title: Airborne geophysical survey: Taylor Mountains
Online_Linkage: https://mrdata.usgs.gov/magnetic/show-survey.php?id=AK_4292
Larger_Work_Citation:
Citation_Information:
Originator: Saltus, R.W.
Originator: Milicevic, B.
Publication_Date: 2004
Title:
Preliminary grid data and maps for an aeromagnetic survey of the Taylor mountains quadrangle and a portion of the Bethel quadrangle, Alaska
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2004-1293
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Online_Linkage: http://pubs.usgs.gov/of/2004/1293/
Description:
Abstract:
Aeromagnetic data were collected along flight lines by instruments in an aircraft that recorded magnetic-field intensity values and location. In surveys such as this one where the data were originally collected in digital form and not digitized from contour maps, the information we provide typically includes latitude, longitude, magnetic anomaly in nanoTeslas, and intermediate values used to derive the magnetic anomaly such as total magnetic field.
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: 200404
Ending_Date: 200405
Currentness_Reference: ground condition
Status:
Progress: complete
Maintenance_and_Update_Frequency: none planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -159.9595
East_Bounding_Coordinate: -155.8911
North_Bounding_Coordinate: 61.04317
South_Bounding_Coordinate: 59.95178
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:ad70c70a-cde0-4189-901c-42b8d6535107
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: Common Geographic Areas
Place_Keyword: f02050 = Bethel
Place_Keyword: f02070 = Dillingham
Place_Keyword: f02164 = Lake and Peninsula
Access_Constraints: none
Use_Constraints: none
Browse_Graphic:
Browse_Graphic_File_Name: Browse_Graphic_File_Description:
Reduced-size image depicting the data, 3096 x 1656 pixels, 739,844 bytes
Browse_Graphic_File_Type: JPEG
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
A preliminary data grid has a grid cell size of 350 meters (1150 feet). Final data processing and quality control have not been applied to these data. The purpose of this preliminary data release is to allow prompt public access to these data, which are of interest for active mineral exploration in the region. A more complete data release and description will be published later once the final data processing is complete.
Logical_Consistency_Report:
In general each original survey was collected by a single contractor, who would be responsible for processing the field observations, and reflect industry standard practices and controls. Variation among surveys is possible, especially if they were carried out during very different time periods.
Completeness_Report:
of 4,857,396 flight-line points, 11,025 contain missing values, each represented by an asterisk
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Detailed positional information is determined by the contractor using navigational controls to specifications given in the contractor reports. Generally these are more precise and accurate for newer surveys than for older ones.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The aircraft vertical position was determined using the navigational positioning equipment on the aircraft, which were radar altimeter and barometric altimeter.
Lineage:
Process_Step:
Process_Description:
The Taylor Mountains aeromagnetic survey was flown in April and May 2004 by McPhar Geosurveys Ltd. under contract to the USGS. The flight lines are oriented northwest to southeast with an interline spacing of 1,600 meters (1 mile). Tie lines were flown in a perpendicular direction (northeast to southwest) with spacing of 12,900 meters (8 miles). The survey flights were 2USGS Open-File Report 20041293 Taylor Mountains, Alaska, preliminary aeromagnetics draped over topography using a preplanned flight surface with a nominal clearance of 305 meters (1,000 feet). Care was taken to avoid data collection during periods of intense diurnal disturbance of the Earths magnetic field. Differential Global Positioning System (GPS) was used for flight navigation.
Process_Date: 200405
Process_Step:
Process_Description:
This data grid is based on minimum curvature gridding of preliminary flight-line data. Data processing at this stage includes field corrections and office corrections. In the field: (1) Compensation for the airplane magnetic field, (2) heading correction (for the influence of the direction in which the magnetic sensor is traversing the Earths magnetic field), (3) lag correction (compensation for the difference of position between the GPS and magnetic sensors). In the office: (4) Tie-line leveling, (5) International Geomagnetic Reference Field (IGRF) removal using IGRF 2000, and (6) microleveling to remove residual flight-line artifacts. Note that base station magnetic data were recorded at several field sites but have not yet been processed or applied to the preliminary data grid. The data have not been subjected to contractor or USGS quality-control checks. The data appear consistent with previous aeromagnetic data and grids for this region (Saltus and Simmons, 1997). The grid is projected using the WGS 84 datum and Universal Transverse Mercator Zone 4. The X location of the bottom-left grid data point is 447,300 meters. The Y location of the bottomleft grid data point is 6,647,200 meters. There are 635 columns (west to east) and 346 rows (south to north) in the data grid. Each grid cell is 350 meters on a side.
Process_Date: 2004
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey, Mineral Resources Program
Contact_Person: Richard W. Saltus
Contact_Address:
Address_Type: mailing address
Address:
Mail Stop 964 Building 20 Denver Federal Center, West 6th Avenue and Kipling Streets
City: Lakewood
State_or_Province: Colorado
Postal_Code: 80225-0046
Contact_Voice_Telephone: 303-236-1375
Contact_Facsimile_Telephone: 303-236-1425
Contact_Electronic_Mail_Address: saltus@usgs.gov
Process_Step:
Process_Description:
Added keywords section with USGS persistent identifier as theme keyword.
Process_Date: 20201110
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Entity point
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 4
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -159
Latitude_of_Projection_Origin: 0.0
False_Easting: 500000
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 1
Ordinate_Resolution: 2
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: World Geodetic System 1984
Ellipsoid_Name: WGS 84
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: TaylorMountains.XYZ
Entity_Type_Definition: Data file contained within the package AK_4292.ZIP
Entity_Type_Definition_Source: USGS
Attribute:
Attribute_Label: XUTM84
Attribute_Definition: Flight-line X coordinate, UTM zone 4, WGS84, meters
Attribute_Definition_Source: Geosoft database
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 116475
Range_Domain_Maximum: 342071
Attribute_Units_of_Measure: meters
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: *
Enumerated_Domain_Value_Definition: Missing value
Enumerated_Domain_Value_Definition_Source: Geosoft database
Attribute:
Attribute_Label: YUTM84
Attribute_Definition: Flight-line Y coordinate, UTM zone 4, WGS84, meters
Attribute_Definition_Source: Geosoft database
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 6654459
Range_Domain_Maximum: 6778505
Attribute_Units_of_Measure: meters
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: *
Enumerated_Domain_Value_Definition: Missing value
Enumerated_Domain_Value_Definition_Source: Geosoft database
Attribute:
Attribute_Label: mag1_mic_fin_305
Attribute_Definition: Magnetic anomaly in nanoTeslas, with field and lab corrections
Attribute_Definition_Source: Geosoft database
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -659.51
Range_Domain_Maximum: 5829.16
Attribute_Units_of_Measure: nanoTeslas
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: *
Enumerated_Domain_Value_Definition: Missing value
Enumerated_Domain_Value_Definition_Source: Geosoft database
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey, Mineral Resources Program
Contact_Person: Peter N. Schweitzer
Contact_Address:
Address_Type: mailing address
Address: Mail Stop 954 USGS National Center, 12201 Sunrise Valley Drive
City: Reston
State_or_Province: Virginia
Postal_Code: 20192
Contact_Voice_Telephone: 703-648-6533
Contact_Facsimile_Telephone: 703-648-6252
Contact_Electronic_Mail_Address: pschweitzer@usgs.gov
Resource_Description: AK_4292.zip
Distribution_Liability:
Reference herein to any specific commercial product, process, or service by trade name,trademark, manufacturer, or otherwise does not 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: CSV
Format_Version_Number: 1.0
Format_Information_Content:
Flight-line airborne magnetic anomaly measurements, collected in digital form
File_Decompression_Technique: unzip
Transfer_Size: 37
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Fees: none
Metadata_Reference_Information:
Metadata_Date: 20201110
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey, Mineral Resources Program
Contact_Person: Peter N. Schweitzer
Contact_Address:
Address_Type: mailing address
Address: Mail Stop 954 USGS National Center, 12201 Sunrise Valley Drive
City: Reston
State_or_Province: Virginia
Postal_Code: 20192
Contact_Voice_Telephone: 703-648-6533
Contact_Facsimile_Telephone: 703-648-6252
Contact_Electronic_Mail_Address: pschweitzer@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

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