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Digital data grids for the magnetic anomaly map of North America

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Viki Bankey
Originator: Alejandro Cuevas
Originator: David Daniels
Originator: Carol A. Finn
Originator: Israel Hernandez
Originator: Patricia Hill
Originator: Robert Kucks
Originator: Warner Miles
Originator: Mark Pilkington
Originator: Carter Roberts
Originator: Walter Roest
Originator: Victoria Rystrom
Originator: Sarah Shearer
Originator: Stephen Snyder
Originator: Ronald Sweeney
Originator: Julio Velez
Originator: Phillips, J.D.
Originator: Ravat, D.
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: U.S. Geological Survey Open-File Report
Issue_Identification: 02-414
Publication_Information:
Publication_Place: Denver, Colorado, USA
Publisher: U.S. Geological Survey
Other_Citation_Details:
This citation generally refers to the DVD and USGS web site that presents the digital gridded data used to make the North American magnetic map.

Modifications have been made to reflect the use of this on the Mineral Resource Spatial Data website (mrdata.usgs.gov) in such areas as projection and image resolution. The image and grid available on https://mrdata.usgs.gov/ is the one referred to as USmag_hp500.grd.
Online_Linkage: http://pubs.usgs.gov/of/2002/ofr-02-414/
Online_Linkage: http://pubs.er.usgs.gov/publication/ofr02414
Online_Linkage: https://mrdata.usgs.gov/magnetic/
Description:
Abstract:
A digital magnetic anomaly database and map for the North American continent is the result of a joint effort by the Geological Survey of Canada (GSC), U. S. Geological Survey (USGS), and Consejo de Recursos Minerales of Mexico (CRM). The database and map represent a substantial upgrade from the previous compilation of magnetic anomaly data for North America, now over a decade old.
Purpose:
This integrated, readily accessible, modern digital database of magnetic anomaly data will be a powerful tool for further evaluation of the structure, geologic processes, and tectonic evolution of the continent and may also be used to help resolve societal and scientific issues that span national boundaries. The North American magnetic anomaly map derived from the digital database provides a comprehensive magnetic view of continental-scale trends not available in individual data sets, helps link widely separated areas of outcrop, and unifies disparate geologic studies.
Supplemental_Information:
Publicly available airborne and marine magnetic data have been collected in North America primarily by the governments of Canada, the U.S., and Mexico.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1945
Ending_Date: 2001
Currentness_Reference: Data collection period
Status:
Progress: complete
Maintenance_and_Update_Frequency: none planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -128.5
East_Bounding_Coordinate: -65.0
North_Bounding_Coordinate: 49.5
South_Bounding_Coordinate: 23.3
Keywords:
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: United States
Place_Keyword: Mexico
Place_Keyword: Canada
Place_Keyword: Atlantic Ocean
Place_Keyword: Pacific Ocean
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: aeromagnetic data
Theme_Keyword: geophysical data
Theme_Keyword: aeromagnetic grid
Theme_Keyword: North American magnetic map
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation
Theme:
Theme_Keyword_Thesaurus: NGDA Portfolio Themes
Theme_Keyword: Geology
Access_Constraints: none
Use_Constraints: none
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Robert P. Kucks
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address:
Box 25046, Mail Stop 964
Denver Federal Center
City: Denver
State_or_Province: CO
Postal_Code: 80225-0046
Country: USA
Contact_Voice_Telephone: 303-236-1405
Contact_Electronic_Mail_Address: rkucks@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name: Browse_Graphic_File_Description: low-resolution graphic file of 1000-meter merged gridded data
Browse_Graphic_File_Type: jpeg
Data_Set_Credit:
North American Magnetic Anomaly Group (NAMAG)
Viki Bankey (USGS)
Alejandro Cuevas (CRM)
David Daniels (USGS)
Carol A. Finn (USGS)
Israel Hernandez (CRM)
Patricia Hill (USGS)
Robert Kucks (USGS)
Warner Miles (GSC)
Mark Pilkington (GSC)
Carter Roberts (USGS)
Walter Roest (GSC)
Victoria Rystrom (USGS)
Sarah Shearer (USGS)
Stephen Snyder (USGS)
Ronald Sweeney (USGS)
Julio Velez (CRM)
Jeffrey Phillips (USGS)
D.K.A. Ravat (Southern Illinois University)
Native_Data_Set_Environment:
These grids were created using the proprietary software Oasis Montaj, from Geosoft, Inc., and are in Geosoft grid format. A free Geosoft interface is available at: http://www.geosoft.com/

This interface can export grids to many other common formats.
Cross_Reference:
Citation_Information:
Originator: U.S. Geological Survey
Originator: National Geophysical Data Center
Publication_Date: 2002
Title:
Digital aeromagnetic data sets of the Conterminous United States and Hawaii
Geospatial_Data_Presentation_Form: digital aeromagnetic profile data
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: 02-361
Publication_Information:
Publication_Place: Denver, CO, USA
Publisher: U.S. Geological Survey
Other_Citation_Details:
Report contains digital aeromagnetic profile data from airborne surveys flown in the United States for the USGS. These data were processed from the original digital data provided by the contractor or the USGS.

Data are available either on a DVD or online at the address below.
Online_Linkage: http://pubs.usgs.gov/of/2002/ofr-02-361/
Cross_Reference:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 1999
Title:
Digitized Aeromagnetic datasets for the conterminous United States, Hawaii, and Puerto Rico.
Geospatial_Data_Presentation_Form: xyz ASCII data
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: 99-557
Publication_Information:
Publication_Place: Denver, CO
Publisher: U.S. Geological Survey
Other_Citation_Details:
The data available in this report are a compilation of digitally converted analog magnetic field intensity maps from the USGS or other public sources.
Online_Linkage: http://pubs.usgs.gov/of/1999/ofr-99-0557/html/mag_home.htm
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Grid values represent the total intensity of the Earth's magnetic field after removal of the International Geomagnetic Reference Field (IGRF). Measurements were made using a variety of magnetometer systems with typical accuracies of 1 to 10 nanotesla (nT).

The grids presented in this report were made from numerous individual grids that were mathematically merged together using standard techniques. Individual metadata files exist for USGS gridded data created from digital flight-line data (see USGS Open-File Report 02-361).

The data in the original grids have been processed using formulas and methods that are not usually documented but that represent industry standard practices for airborne data reduction.
Logical_Consistency_Report:
The data in this file were collected by various contractors or groups who were responsible for collecting and processing the data.

The data used to make these grids were collected using different instruments (magnetometers, altimeters, navigational systems) throughout the survey, but were usually consistent within each survey.

Survey contracts specified the conditions and specifications under which these data were collected. Standard industry practices of the time were followed in data collection and processing.
Completeness_Report:
The North American Magnetic Anomaly grids were compiled from the best available aermomagnetic surveys publicly available in 2002. Best available would be data having the highest resolution, closest line-spacing, most accurate instrumentation, most accurate flight-elevation surface, and similar specifications commonly used in the airborne surveying industry. In many areas, only one survey was available. In many offshore areas and some onshore areas, no data were available at all, and these areas were left blank.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Flight Path Recovery - before about 1975 Horizontal position of the survey aircraft used to collect data were determined by reconciling down-looking photographs (recorded on continuous-strip film) with topographic maps and orthophotoquadrangle maps. Fiducial numbers and marks, impressed on any paper strips that were recording data or added to magnetic tape records, were included as a function of time to further reconcile location with instrumentation.

Flight Path Recovery - before about 1990 Horizontal position of the survey aircraft used to collect data were determined using aircraft navigational aids such as line-of-sight electronic systems that measure the distances from each of two ground stations to the aircraft using microwave or radio transmitters.

Flight Path Recovery - after about 1990 Horizontal position of the survey aircraft used to collect data were determined using GPS satellite navigation.
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.

Radar altimeters are estimated to have an error of 2-5% of the altitude (Richard Hansen, PRJ, Inc., written communication).

Barometric altimeters are quite accurate, but are typically operated in an uncorrected mode. The diurnal variation in air pressure over the course of a flight can produce a 50-100 ft error in the barometric altimeter reading. In addition, pressure microcells create short-period air pressure changes equivalent to about 10 ft under typical conditions (Richard Hansen, PRJ, Inc., written communication)

The magnetometer was carried on a "stinger" that was attached to the aircraft or was carried in a bird towed on a line that was below the aircraft. The bird as it is towed is slightly behind the aircraft and therefore the vertical distance between the magnetometer and the aircraft is slightly less than the length of the line but remains constant for the survey.

Data were either collected at a fixed barometric altitude or were collected as a draped survey having an average terrain clearance above the ground. Because aircraft, especially airplanes, cannot safely maintain a constant terrain clearance, error in vertical position is introduced.
Lineage:
Process_Step:
Process_Description:
We obtained all available aeromagnetic surveys. Some data were digitized from analog maps if digital data were unavailable. The remainder were processed using digital flight-line data.

Details of data acquisition are described in the booklet that accompanies the printed map.

The marine data were obtained from the National Geophysical Data Center of the National Oceanic and Atmospheric Administration spanned the years 1958 through 1997.
Process_Date: 2002
Process_Step:
Process_Description:
Aeromagnetic data were processed so that residual magnetic values were calculated in a consistent manner:

- The DGRF, updated to survey date, was removed

- The flight elevation was used to mathematically calculate the equivalent magnetic field at 1,000 ft. above terrain

- obvious errors were corrected

- x-y locations were calculated for the described DNAG projection

- data were gridded at 1/3 - 1/4 of the flight-line spacing, then regridded to 1 km.
Process_Date: 2002
Process_Step:
Process_Description:
Using various USGS in-house programs (before 1999) or Geosoft/Oasis Montaj (after 1999), gridded data were mathematically merged together. For the U.S. part, scientists merged groups of surveys by state or groups of states. States were merged into regions, and regions into countries.

Procedures and software used to compile the 1-km grid of magnetic data for Canada are detailed on the Geophysical Data Centre website.
Process_Date: 2002
Process_Step:
Process_Description:
Creation of a wavelength filtered grid.

Because wavelengths greater than roughly 150 km are unreliable in the compilation, applying a high-pass wavelength filter would appear to be a viable solution to remove these unreliable wavelengths. However, removing wavelengths less than 500 km from the merged grid creates artifacts, such as spurious separation of continuous anomalies. Therefore, we removed anomalies with wavelengths greater than 500 km from the merged grid to reduce the effects caused by the erroneous long wavelengths but maintaining continuity of anomalies. The correction was accomplished by transforming the merged grid to the frequency domain, filtering the transformed data with a long-wavelength cutoff at 500 km, and subtracting the long-wavelength data grid from the merged grid.
Process_Date: 2002
Process_Step:
Process_Description:
An equivalent source method based on long-wavelength characterization using satellite data was used to correct for long-wavelength shifts.

We produced an aeromagnetic grid in which the wavelengths longer than 500 km have been replaced by downward-continued CHAMP satellite data. Steps 0 and 6 were performed by Bob Kucks. Steps 1-4 were performed by Tiku Ravat. Step 5 was performed by Jeff Phillips.

0. The North American 1 km merged grid was decimated to 5 km.

1. This 5 km grid was converted to a 0.05 degree grid. This grid was low-pass filtered using a Gaussian filter with a 500 km cutoff, then decimated to 1 degree.

2. A joint inversion of this 1 degree low-pass aeromagnetic grid and CHAMP satellite data, with the aeromagnetic data weighted very low, produced a stabilized downward continuation of the CHAMP data.

3. The inverted data were interpolated to 0.05 degree and again low-pass filtered using the same Gaussian 500 km filter to remove

4. The low-pass grid from step 1 was subtracted from the original 0.05 degree aeromagnetic grid to create a 500 km high-pass aeromagnetic grid. This grid was added to the low-pass inverted grid from step 3 to get a corrected 0.05 degree aeromagnetic grid.

5. The corrected 0.05 aeromagnetic degree grid was projected to the DNAG projection and regridded to 5 km. This was subtracted from the decimated 5 km aeromagnetic grid to generate a 5 km correction grid. A matched filter was used to remove short-wavelength artifacts resulting from the projection and regridding process.

6. The resulting 5 km correction grid was regridded to the original 1 km grid and subtracted from the original 1 km aeromagnetic grid to generate the final 1 km corrected aeromagnetic grid.
Process_Date: 2002
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: raster
Raster_Object_Information:
Raster_Object_Type: grid cell
Row_Count: 3000
Column_Count: 5000
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Transverse Mercator
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.926
Longitude_of_Central_Meridian: -100.0
Latitude_of_Projection_Origin: 0
False_Easting: 0
False_Northing: 0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 1000
Ordinate_Resolution: 1000
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: DNAG
Ellipsoid_Name: STM1987
Semi-major_Axis: 6371204.0
Denominator_of_Flattening_Ratio: 1.0
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: USmag_origmrg.grd
Entity_Type_Definition:
Grid containing the residual total intensity of the Earth's magnetic field.
Attribute:
Attribute_Label: grid cell
Attribute_Definition:
Residual total intensity of Earth's magnetic field.

The total magnetic value minus a geomagnetic reference field (GRF), which is a long-wavelength regional magnetic field. The most commonly used reference field is determined from a model developed by the International Association of Geomagnetism and Aeronomy (IAGA). The International Geomagnetic Reference Field (IGRF), is a predictive model adopted at the beginning of a model period (e.g. in 1989 for 1990-1995). After the model period, a revised definitive model is adopted, the DGRF. This is the preferred model to use for removing regional magnetic fields
Attribute_Definition_Source:
Nettleton, L.L., 1971, Elementary Gravity and Magnetics for Geologists and Seismologists: Society of Exploration Geophysicists Monograph Series No. 1, p. 83-87.

A description of magnetometers and how they measure the total magnetic field can be found in:

Dobrin, M.B., 1976, Introduction to Geophysical Prospecting: New York, McGraw-Hill Book Company, p. 505-517.
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -4937.6
Range_Domain_Maximum: 13262.4
Attribute_Units_of_Measure: nanoteslas
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: -1.0E+32
Enumerated_Domain_Value_Definition: missing data
Attribute_Value_Accuracy_Information:
Attribute_Value_Accuracy: 2 nanoteslas
Attribute_Value_Accuracy_Explanation:
The Geomagnetic Reference Field that was subtracted from the total magnetic value is based on a model, which was updated to the date of the survey. New models are available at five year intervals. These models have varying degrees of accuracy in determining the local reference field.
Detailed_Description:
Entity_Type:
Entity_Type_Label: USmag_hp500.grd
Entity_Type_Definition:
Grid made by removing a 500-km high-pass filtered from the total intensity data.
Attribute:
Attribute_Label: grid cell
Attribute_Definition:
500-km high-pass filtered grid calculated from residual magnetic grid

Because wavelengths greater than roughly 150 km are unreliable in the compilation, applying a high-pass wavelength filter would appear to be a viable solution to remove these unreliable wavelengths. However, removing wavelengths less than 500 km from the merged grid creates artifacts, such as spurious separation of continuous anomalies. Therefore, we removed anomalies with wavelengths greater than 500 km from the merged grid to reduce the effects caused by the erroneous long wavelengths but maintaining continuity of anomalies. The correction was accomplished by transforming the merged grid to the frequency domain, filtering the transformed data with a long-wavelength cutoff at 500 km, and subtracting the long-wavelength data grid from the merged grid.
Attribute_Definition_Source: standard
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -5033.9
Range_Domain_Maximum: 13218.7
Attribute_Units_of_Measure: nanoteslas
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: -1.0E+32
Enumerated_Domain_Value_Definition: missing data
Detailed_Description:
Entity_Type:
Entity_Type_Label: USmag_CM.grd
Entity_Type_Definition:
Grid made by removing a magnetic field that was calculated from satellite magnetic data by Tiku Ravat of of Southern Illinois University.
Attribute:
Attribute_Label: grid cell
Attribute_Definition:
An equivalent source method based on long-wavelength characterization using satellite data was used to correct for long-wavelength shifts.

We produced an aeromagnetic grid in which the wavelengths longer than 500 km have been replaced by downward-continued CHAMP satellite data. Steps 0 and 6 were performed by Bob Kucks. Steps 1-4 were performed by Tiku Ravat. Step 5 was performed by Jeff Phillips.

0. The North American 1 km merged grid was decimated to 5 km.

1. This 5 km grid was converted to a 0.05 degree grid. This grid was low-pass filtered using a Gaussian filter with a 500 km cutoff, then decimated to 1 degree.

2. A joint inversion of this 1 degree low-pass aeromagnetic grid and CHAMP satellite data, with the aeromagnetic data weighted very low, produced a stabilized downward continuation of the CHAMP data.

3. The inverted data were interpolated to 0.05 degree and again low-pass filtered using the same Gaussian 500 km filter to remove

4. The low-pass grid from step 1 was subtracted from the original 0.05 degree aeromagnetic grid to create a 500 km high-pass aeromagnetic grid. This grid was added to the low-pass inverted grid from step 3 to get a corrected 0.05 degree aeromagnetic grid.

5. The corrected 0.05 aeromagnetic degree grid was projected to the DNAG projection and regridded to 5 km. This was subtracted from the decimated 5 km aeromagnetic grid to generate a 5 km correction grid. A matched filter was used to remove short-wavelength artifacts resulting from the projection and regridding process.

6. The resulting 5 km correction grid was regridded to the original 1 km grid and subtracted from the original 1 km aeromagnetic grid to generate the final 1 km corrected aeromagnetic grid.
Attribute_Definition_Source:
Ravat, D., Whaler, K.A., Pilkington, M., Sabaka, T., and Purucker, M., 2002, Compatibility of high-altitude aeromagnetic and satellite-altitude magnetic anomalies over Canada: Geophysics, v. 67, p. 546-554.
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -5090
Range_Domain_Maximum: 13227
Attribute_Units_of_Measure: nanoteslas
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: -1.0E+32
Enumerated_Domain_Value_Definition: missing data
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: DVD distributor: USGS Information Services
Contact_Address:
Address_Type: mailing address
Address:
Box 25286, Building 810
Denver Federal Center
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: 303-202-4700
Contact_Electronic_Mail_Address: www.usgs.gov/pubprod
Resource_Description: USGS Open-File Report OFR 02-0414
Distribution_Liability:
Although all data published in these grids have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials.

Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
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Metadata_Reference_Information:
Metadata_Date: 20161207
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Peter N Schweitzer
Contact_Organization: USGS Eastern Mineral and Environmental Resources Science Center
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing address
Address: 12201 Sunrise Valley Drive
City: Reston
State_or_Province: VA
Postal_Code: 20192-0002
Country: USA
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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