nrm_mpot_iw - Digital raster grid of intermediate-wavelength magnetic potential anomalies for the Northern Rocky Mountains and adjacent areas, Idaho, Montana, Washington, Oregon, and Wyoming.
Metadata also available as
Metadata:
- Identification_Information:
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- Citation:
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- Citation_Information:
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- Originator: Mankinen, Edward A.
- Originator: Hildenbrand, T.G.
- Originator: Zientek, M.L.
- Originator: Box, S.E.
- Originator: Bookstrom, A.A.
- Originator: Carlson, M.H.
- Originator: Larsen, J.C.
- Publication_Date: 2004
- Title:
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nrm_mpot_iw - Digital raster grid of intermediate-wavelength magnetic potential anomalies for the Northern Rocky Mountains and adjacent areas, Idaho, Montana, Washington, Oregon, and Wyoming.
- Edition: version 1.0
- Geospatial_Data_Presentation_Form: raster digital data
- Series_Information:
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- Series_Name: Open-File Report
- Issue_Identification: 1413
- Publication_Information:
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- Publication_Place: Menlo Park, California
- Publisher: U.S. Geological Survey
- Online_Linkage: <http:/pubs.usgs.gov/of/2004/1413/>
- Description:
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- Abstract:
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Regional aeromagnetic surveys reflect measurements of the intensity of the Earth’s magnetic field relative to the International Geomagnetic Reference Field. Although the geomagnetic field is complex and affected by both internal and external sources, their effects are generally well characterized allowing the isolation of magnetic fields due to crustal sources. Data for a specific area, however, usually derive from numerous individual surveys with widely varying flight specifications. By merging such disparate data sets to a common datum, aeromagnetic maps and their derivatives can be used to characterize local magnetic variations in the middle and upper crust The raster grid, nrm_mpot_iw, represents the intermediate-wavelength data of the magnetic potential (using a three-layer model). These data highlight magnetic sources in the upper crust. This grid emphasizes many of the same sources seen in the magnetic residual (nrm_magres) but removes much of the short-wavelength noise.
- Purpose:
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This raster grid was created to assist in developing regional digital earth science data and interpretations that can be used by Federal land managers in regional planning and special assessments such as road-less area withdrawals.
- Supplemental_Information:
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The intermediate-wavelength magnetic potential anomaly grid is provided in three formats; ESRI gird, Geosoft OASIS montaj format and binary format used by the USGS. This metadata file describes the processes used to create the ESRI grid and does not provide additional information about the Geosoft or USGS grids. The GeoSoft OASIS montaj format grid is available in the \GeoSoft folder at the top-level directory. The binary USGS format grid is available in the \USGS folder at the top-level directory.
- Time_Period_of_Content:
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- Time_Period_Information:
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- Single_Date/Time:
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- Calendar_Date: 2004
- Currentness_Reference: publication date
- Status:
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- Progress: Complete
- Maintenance_and_Update_Frequency: None planned
- Spatial_Domain:
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- Bounding_Coordinates:
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- West_Bounding_Coordinate: -119.00
- East_Bounding_Coordinate: -107.00
- North_Bounding_Coordinate: 49.00
- South_Bounding_Coordinate: 42.00
- Keywords:
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- Theme:
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- Theme_Keyword_Thesaurus: none
- Theme_Keyword: geophysics
- Theme_Keyword: geophysical map
- Theme_Keyword: magnetic potential
- Theme_Keyword: intermediate-wavelength
- Place:
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- Place_Keyword_Thesaurus: none
- Place_Keyword: Idaho
- Place_Keyword: Montana
- Place_Keyword: Washington
- Place_Keyword: Oregon
- Place_Keyword: Wyoming
- Place_Keyword: Northern Rocky Mountains
- Place_Keyword: USA
- Access_Constraints: none
- Use_Constraints: none
- Point_of_Contact:
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- Contact_Information:
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- Contact_Person_Primary:
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- Contact_Person: Edward A. Mankinen
- Contact_Organization: U.S. Geological Survey
- Contact_Position: geologist
- Contact_Address:
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- Address_Type: mailing and physical address
- Address: 345 Middlefield Rd. Mail Stop 937
- City: Menlo Park
- State_or_Province: CA
- Postal_Code: 94025
- Country: USA
- Contact_Voice_Telephone: 1-650-329-4669
- Contact_Facsimile_Telephone: 1-650-329-4664
- Contact_Electronic_Mail_Address: emank@usgs.gov
- Native_Data_Set_Environment:
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Microsoft Windows 2000 Version 5.1 (Build 2600) Service Pack 1; ESRI ArcGIS 8.3
- Data_Quality_Information:
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- Attribute_Accuracy:
- Logical_Consistency_Report: No duplicate features exist.
- Positional_Accuracy:
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- Horizontal_Positional_Accuracy:
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- Horizontal_Positional_Accuracy_Report:
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Horizontal position of the survey aircraft used to collect data were determined by one of three ways: reconciling down-looking photographs with topographic maps and orthophotoquadrangle maps, aircraft navigational systems, or GPS (NAMAG, 2002)
- Vertical_Positional_Accuracy:
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- Vertical_Positional_Accuracy_Report:
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The original NAMAG (2002) data was collected from multiple contractors or groups using different instruments. The accuracies of these measurements typically range from 1 to 10 nanotesla (nT). The effect of the combination of band-pass filtering and pseudo-gravity transformation has not been determined.
- Lineage:
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- Source_Information:
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- Source_Citation:
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- Citation_Information:
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- Originator: North American Magnetic Anomaly Group (NAMAG)
- Publication_Date: 2002
- Title:
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Digital data grids for the magnetic anomaly map of North America
- Geospatial_Data_Presentation_Form: raster digital data
- Series_Information:
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- Series_Name: Open-File Report
- Issue_Identification: 02-414
- Publication_Information:
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- Publication_Place: Denver, Colorado
- Publisher: U.S. Geological Survey
- Online_Linkage: <http://pubs.usgs.gov/of/2002/ofr-02-414>
- Type_of_Source_Media: online
- Source_Time_Period_of_Content:
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- Time_Period_Information:
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- Single_Date/Time:
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- Calendar_Date: 2002
- Source_Currentness_Reference: publication date
- Source_Citation_Abbreviation: NAMAG (2002)
- Source_Contribution: This is the source of the magnetic grids.
- Source_Information:
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- Source_Citation:
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- Citation_Information:
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- Originator: Hildenbrand, T.G.
- Publication_Date: 1983
- Title:
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FFTFIL: A filtering program based on two-dimensional Fourier analysis
- Series_Information:
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- Series_Name: Open-File Report
- Issue_Identification: 83-237
- Publication_Information:
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- Publisher: U.S. Geological Survey
- Source_Time_Period_of_Content:
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- Time_Period_Information:
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- Single_Date/Time:
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- Calendar_Date: 1983
- Source_Currentness_Reference: publication date
- Source_Citation_Abbreviation: Hildenbrand (1983)
- Source_Contribution:
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Outlined the program used to calculate the pseudogravity transform
- Source_Information:
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- Source_Citation:
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- Citation_Information:
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- Originator: Phillips, J.D.
- Publication_Date: 1997
- Title: Potential-field geophysical software for the PC, version 2.2
- Series_Information:
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- Series_Name: Open-File Report
- Issue_Identification: 97-725
- Publication_Information:
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- Publisher: U.S. Geological Survey
- Source_Time_Period_of_Content:
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- Time_Period_Information:
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- Single_Date/Time:
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- Calendar_Date: 1997
- Source_Currentness_Reference: publication date
- Source_Citation_Abbreviation: Phillips (1997)
- Source_Contribution: Provided the algorithms used to filter the data
- Process_Step:
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- Process_Description:
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These data were extracted from the published magnetic anomaly grid for North America (NAMAG, 2002) and re-projected to the specifications of the study area using USGS in-house developed software. In-house software was used to convert from USGS grid format to ARC/INFO grid format, then saved as grid, nrm_aeromag.
- Source_Used_Citation_Abbreviation: NAMAG, 2002
- Process_Date: 2002
- Process_Step:
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- Process_Description:
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The gridded aeromagnetic data (nrm_aeromag) were converted to their magnetic potential ("pseudogravity") using USGS in-house developed software. In-house software was used to convert from USGS grid format to ARC/INFO grid format, then saved as grid, nrm_mpot. Pseudogravity transform performed using the algorithms of Hildenbrand (1983).
- Source_Used_Citation_Abbreviation: Hildenbrand (1983)
- Process_Date: 2003
- Process_Step:
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- Process_Description:
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The gridded magnetic potential dataset (nrm_mpot) was filtered to isolate prominent wavelengths in the dataset using USGS in-house developed software. This grid contains the intermediate-wavelength data. In-house software was used to convert from USGS grid format to ARC/INFO grid format. Filtering was performed using the matched bandpass filtering algorithms of Phillips (1997). Upward continuation performed using the algorithms of Hildenbrand (1983).
- Source_Used_Citation_Abbreviation: Phillips (1997)
- Source_Used_Citation_Abbreviation: Hildenbrand (1983)
- Process_Date: 2003
- Spatial_Data_Organization_Information:
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- Direct_Spatial_Reference_Method: Raster
- Raster_Object_Information:
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- Raster_Object_Type: Grid Cell
- Row_Count: 795
- Column_Count: 827
- Vertical_Count: 1
- Spatial_Reference_Information:
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- Horizontal_Coordinate_System_Definition:
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- Planar:
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- Map_Projection:
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- Map_Projection_Name: Albers Conical Equal Area
- Albers_Conical_Equal_Area:
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- Standard_Parallel: 44.000000
- Standard_Parallel: 48.000000
- Longitude_of_Central_Meridian: -114.000000
- Latitude_of_Projection_Origin: 41.000000
- False_Easting: 0.000000
- False_Northing: 0.000000
- Planar_Coordinate_Information:
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- Planar_Coordinate_Encoding_Method: row and column
- Coordinate_Representation:
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- Abscissa_Resolution: 1000.000000
- Ordinate_Resolution: 1000.000000
- Planar_Distance_Units: meters
- Geodetic_Model:
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- Horizontal_Datum_Name: North American Datum of 1927
- Ellipsoid_Name: Clarke 1866
- Semi-major_Axis: 6378206.400000
- Denominator_of_Flattening_Ratio: 294.978698
- Distribution_Information:
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- Distributor:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization: U.S. Geological Survey Information Services
- Contact_Address:
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- Address_Type: mailing address
- Address: P.O. Box 25286
- City: Denver
- State_or_Province: CO
- Postal_Code: 80225
- Country: USA
- Contact_Voice_Telephone: (888) ASK-USGS
- Contact_Voice_Telephone: (888) 275-8747
- Contact_Electronic_Mail_Address: infoservices@usgs.gov
- Resource_Description: Downloadable data for USGS Open-File Report 2004-1413
- Distribution_Liability:
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The U.S. Geological Survey (USGS) provides these geographic data "as is." The USGS makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. The USGS further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers of the USGS, no warranty, expressed or implied, is made by the USGS regarding the uses of these data on any other system, nor does the fact of distribution constitute or imply any such warranty. In no event shall the USGS have liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by the USGS.
- Standard_Order_Process:
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- Digital_Form:
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- Digital_Transfer_Information:
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- Format_Name: ZIP
- Format_Version_Number: 9.0
- Format_Specification: WINZIP® 9.0
- Format_Information_Content:
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ZIP archive for thirteen ArcInfo® grids: nr_bouguer, nrg_irg, nrg_irg_1vd, nrg_irg_inv, nrg_irg_iw, nrg_irg_lw, nrg_irg_tr, nrm_aeromag, nrm_magres, nrm_mpot, nrm_mpot_iw, nrm_mpot_lw, and nrm_mpot_tr.
- File_Decompression_Technique:
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To open a ZIP archive, double-click on the archive listed in My Computer or Windows Explorer, drag and drop the archive onto WINZIP®, or use the standard Open dialogue box.
- Transfer_Size: 26 (MB)
- Digital_Transfer_Option:
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- Online_Option:
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- Computer_Contact_Information:
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- Network_Address:
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- Network_Resource_Name: <http://pubs.usgs.gov/of/2004/1413>
- Fees: No fee for downloadable data and report
- Technical_Prerequisites:
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User must have geographic information system (GIS) software capable of reading ESRI ArcInfo® file formats.
- Metadata_Reference_Information:
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- Metadata_Date: 20050929
- Metadata_Contact:
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- Contact_Information:
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- Contact_Person_Primary:
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- Contact_Person: Jeremy C. Larsen
- Contact_Organization:
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Information Systems Support (under contract to the U.S. Geological Survey)
- Contact_Position: contractor
- Contact_Address:
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- Address_Type: mailing and physical address
- Address: 904 W. Riverside Avenue, Rm. 202
- City: Spokane
- State_or_Province: WA
- Postal_Code: 99201
- Country: USA
- Contact_Voice_Telephone: 1-509-368-3101
- Contact_Facsimile_Telephone: 1-509-368-3199
- Contact_Electronic_Mail_Address: jlarsen@usgs.gov
- Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
- Metadata_Standard_Version: FGDC-STD-001-1998
- Metadata_Time_Convention: local time
- Metadata_Extensions:
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- Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
- Profile_Name: ESRI Metadata Profile
Generated by mp version 2.8.6 on Thu Sep 29 09:25:19 2005