nrm_aeromag - Digital raster grid of magnetic anomalies for the Northern Rocky Mountains and adjacent areas, Idaho, Montana, Washington, Oregon, and Wyoming.

Metadata also available as

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Mankinen, E.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:
nrm_aeromag - Digital raster grid of magnetic 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:
Series_Name: Open-File Report
Issue_Identification: 1413
Publication_Information:
Publication_Place: Menlo Park, California
Publisher: U.S. Geological Survey
Online_Linkage: <http:/pubs.usgs.gov/of/2004/1413/>
Description:
Abstract:
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_aeromag, represents the aeromagnetic data for the study area. The anomalies seen represent the total magnetization (vector sum of both remanent and induced components) of rocks generally interpreted to lie above mid-crustal regions.
Purpose:
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:
The magnetic 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:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2004
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -118.531440
East_Bounding_Coordinate: -107.228179
North_Bounding_Coordinate: 49.147341
South_Bounding_Coordinate: 41.826625
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: Geophysics
Theme_Keyword: aeromagnetic map
Theme_Keyword: magnetic anomalies
Place:
Place_Keyword: Northern Rocky Mountains
Place_Keyword: Idaho
Place_Keyword: Montana
Place_Keyword: Washington
Place_Keyword: Oregon
Place_Keyword: Wyoming
Place_Keyword: USA
Access_Constraints: none
Use_Constraints: none
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Edward A. Mankinen
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing address
Address: 345 Middenfield Rd, Mail Stop 937
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3591
Contact_Voice_Telephone: (650) 329-4669
Contact_Facsimile_Telephone: (650) 329-4664
Contact_Electronic_Mail_Address: emank@usgs.gov
Native_Data_Set_Environment:
Microsoft Windows 2000 Version 5.1 (Build 2600) Service Pack 1; ESRI ArcGIS 8.3
Data_Quality_Information:
Attribute_Accuracy:
Logical_Consistency_Report: No duplicate features exist
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
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:
Vertical_Positional_Accuracy_Report:
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).
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: North American Magnetic Anomaly Group
Publication_Date: 2002
Title:
Digital data grids for the magnetic anomaly map of North America
Geospatial_Data_Presentation_Form: raster digital data
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 02-414
Publication_Information:
Publication_Place: Denver, Colorado
Publisher: U.S. Geological Survey
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2002
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: NAMAG, 2002
Source_Contribution: Source of the magnetic anomaly data for the study area.
Process_Step:
Process_Description:
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.
Source_Used_Citation_Abbreviation: NAMAG, 2002
Process_Date: 2003
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 203
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 795
Column_Count: 827
Vertical_Count: 1
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Albers Conical Equal Area
Albers_Conical_Equal_Area:
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:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 1000.000000
Ordinate_Resolution: 1000.000000
Planar_Distance_Units: meters
Geodetic_Model:
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:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey Information Services
Contact_Address:
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:
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 at the USGS, no warranty, expressed or implied, is made by the USGS regarding the use 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 any 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 USGS.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ZIP
Format_Version_Number: 9.0
Format_Specification: WINZIP® 9.0
Format_Information_Content:
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:
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:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://pubs.usgs.gov/of/2004/1413>
Fees: No fee for downloadable data and report
Technical_Prerequisites:
User must have geographic information system (GIS) software capable of reading ESRI ArcInfo® file formats.
Metadata_Reference_Information:
Metadata_Date: 20050929
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jeremy C. Larsen
Contact_Organization:
Information Systems Support (under contract to the U.S. Geological Survey)
Contact_Position: contractor
Contact_Address:
Address_Type: mailing and physical address
Address: 904 W. Riverside Ave, Room 202
City: Spokane
State_or_Province: WA
Postal_Code: 99201
Contact_Voice_Telephone: (509) 368-3118
Contact_Facsimile_Telephone: (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:
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 09:24:15 2005