Southeast Arizona

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Metadata:

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Entity_and_Attribute_Information
Distribution_Information
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator:

U.S. Department of Energy, U.S. Geological Survey, Department of Interior and the National Geophysical Data Center, NOAA

Publication_Date: 2009
Title: Southeast Arizona
Geospatial_Data_Presentation_Form: tabular digital data
Online_Linkage:

https://mrdata.usgs.gov/magnetic/show-survey.php?id=southeast_arizona

Larger_Work_Citation:

Citation_Information:

Originator:

U.S. Geological Survey, Department of the Interior, the National Geophysical Data Center, U.S. Department of Energy

Publication_Date: 2009
Title:

Aeromagnetic and aeroradiometric data for the Conterminous United States and Alaska from the National Uranium Resource Evaluation (NURE) Program of U.S. Department of Energy

Series_Information:

Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: OFR 2009-1129

Publication_Information:

Publication_Place: Denver, CO
Publisher: U.S. Geological Survey

Description:

Abstract:

Note: Radiometric data are not included with this survey. Radiometric data are included in the individual quadrangles: Douglas, Silver City, Clifton, Mesa, Tucson, and Nogales. Aeromagnetic and aeroradiometric data were collected along flight lines by instruments in an aircraft that recorded magnetic-field and radiometric values and locations. The magnetic data set presents latitude, longitude, altitude, and magnetic-field values. Geologic symbols or codes are also included. The geologic symbols were picked from surficial geologic maps. The radiometric data set presents latitude, longitude, altitude, geologic symbols or codes, apparent Uranium (Bismuth 214), Thorium (Thallium 208), and Potassium (K 40), the element ratios, and ancillary information.

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. Aeromagnetic anomaly maps are important tools in mapping surficial and buried igneous rocks. 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. Aeroradiometric surveys measure the radiation emanating from the earth's surface, which provides general estimates of the geographic distribution of uranium, thorium, and potassium in surficial and some bedrock units. Bismuth 214 and Thallium 208 are decay products of Uranium and Thorium. Along with Potassium 40 they give identifiable peaks in the gamma-ray spectra of naturally occurring radiation. The element data and the ratios of the element data are used to help map surficial geology and to detect concentrations of radioactive minerals.

Supplemental_Information:

The U.S. Department of Energy through Bendix Corp. contracted numerous airborne surveys over a period from 1974 to 1981 covering most of the conterminous United States and much of Alaska. The primary purpose was to obtain airborne radiometric data in order to locate and evaluate uranium resources. Aeromagnetic data were also acquired at the same time. In the mid-1980's, all the NURE Program's data were given to the U.S. Geological Survey. The aeromagnetic data were also archived at the National Geophysical Data Center. With the improvement in digital communication and the ability to store and transmit large data sets, the USGS is now able to release the flight-line data in a common format. The U.S. Geological Survey has contracted or flown numerous airborne surveys over a long period (1950's to present). Much of the digital flight-line data have been released to the public through a companion DVD and a web site. Reference is in the Cross-Reference section of this metadata file. A companion CD-ROM/web site has been released containing magnetic data that were generated by digitizing analog maps. The original analog flight-line profiles used to create the analog maps are unavailable. Reference is in the Cross-Reference section of this metadata file. CD's have been released containing the original radiometric flight-line data in various formats. Reference is in the Cross-Reference section of this metadata file.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19741204
Ending_Date: 19750220

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: -111.72
East_Bounding_Coordinate: -109.00
North_Bounding_Coordinate: 33.56
South_Bounding_Coordinate: 31.33

Data_Set_G-Polygon:

Data_Set_G-Polygon_Outer_G-Ring:

G-Ring:

-111.72 31.50, -111.72 33.56, -109.00 33.56, -109.00 31.33, -111.10 31.33, -111.72 31.50

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:f4d22d4c-a3b1-43c0-a2ab-87be31d2e210

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_Keyword: aeroradiometric surveys
Theme_Keyword: radiometric surveys
Theme_Keyword: radiometric
Theme_Keyword: radioactivity
Theme_Keyword: uranium
Theme_Keyword: thorium
Theme_Keyword: potassium
Theme_Keyword: total count

Place:

Place_Keyword_Thesaurus: none
Place_Keyword: United States
Place_Keyword: Arizona
Place_Keyword: AZ
Place_Keyword: Douglas
Place_Keyword: Silver City
Place_Keyword: Clifton
Place_Keyword: Mesa
Place_Keyword: Tucson
Place_Keyword: Nogales

Access_Constraints: none
Use_Constraints:

none. Acknowledgement of the U.S. Geological Survey, National Geophysical Data Center, and U.S. Department of Energy would be appreciated in products derived from these data.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: USGS Gravity and Magnetics Contact

Contact_Address:

Address_Type: mailing address
Address:

U.S. Geological Survey
Box 25046 Mail Stop 964
Denver Federal Center

City: Denver
State_or_Province: CO
Postal_Code: 80225

Contact_Voice_Telephone: 303-236-5652

Data_Set_Credit:

These USGS employees contributed to reformatting and archiving these data: Pat Hill, Bob Kucks, Rick Saltus, Ron Sweeney, Sarah Shearer Cooperating contributors from the National Geophysical Data Center are: Ronald Buhmann, David Dater, Susan McLean, Stewart Racey

Native_Data_Set_Environment:

These data were originally recorded on 9-track magnetic tapes and were transferred to CD-ROM. Data processing took place on a Dell personal computer running a Windows XP operating system. Data were reformatted using the Geosoft, Inc., program Oasis Montaj version 6.3.

Cross_Reference:

Citation_Information:

Originator: U.S. Geological Survey
Publication_Date: 1999
Title:

Digitized Aeromagnetic Datasets of the Conterminous United States, Hawaii, and Puerto Rico

Geospatial_Data_Presentation_Form: raster digital data
Series_Information:

Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: OFR 99-557

Publication_Information:

Publication_Place: Denver CO
Publisher: U.S. Geological Survey

Other_Citation_Details:

CD-ROM or online files Complements this publication with analog data

Online_Linkage: <URL:http://pubs.usgs.gov/of/1999/ofr-99-0557/html/mag_home.htm

Cross_Reference:

Citation_Information:

Originator: U.S. Geological Survey
Publication_Date: 2002
Title:

Digital Aeromagnetic Datasets of the Conterminous United States and Hawaii

Geospatial_Data_Presentation_Form: raster digital data
Series_Information:

Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: OFR 02-361

Publication_Information:

Publication_Place: Denver CO
Publisher: U.S. Geological Survey

Other_Citation_Details:

CD-ROM or online files Complements this publication with digital data

Online_Linkage: <URL:http://pubs.usgs.gov/of/2002/ofr-02-361/mag_home.htm

Cross_Reference:

Citation_Information:

Originator: U.S. Geological Survey
Publication_Date: 1999
Title:

Aerial Gamma-Ray Surveys of the Conterminous United States and Alaska

Geospatial_Data_Presentation_Form: raster digital data
Series_Information:

Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: OFR 99-0562-A through -M

Publication_Information:

Publication_Place: Denver CO
Publisher: U.S. Geological Survey

Other_Citation_Details: Thirteen CD-ROMs

Cross_Reference:

Citation_Information:

Originator:

U.S. Energy Research and Development Administration, Grand Junction Office

Publication_Date: 1975
Title: Airborne geophysical survey, southeast Arizona
Geospatial_Data_Presentation_Form: map
Series_Information:

Series_Name: Grand Junction Office Report (GJ0)
Issue_Identification: GJ0-1643

Publication_Information:

Publication_Place: Grand Junction, Colorado
Publisher: U.S. ERDA, Grand Junction Office

Other_Citation_Details:

map scales 1:250,000 and 1:500,000 Author(s): Texas Instruments, Inc.

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

The data in this file have been processed using various formulas and methods that are not usually documented but that represent industry standard practices for airborne data reduction. For example, position is listed as latitude and longitude, but these values were derived from the raw navigation data depending on the system used. (see notes under horizontal accuracy). Line numbers were added to records, and unusable data at flight-line ends were discarded (as aircraft slowed and turned around). Separate recordings were correlated by time and assigned to the correct location. The exact accuracies of these processing steps may not be known. They are discussed in the sections on attribute or positional accuracies.

Logical_Consistency_Report:

The data in this file were collected by a single contractor or group who were responsible for collecting and processing the data. The data from this survey were collected using the same instruments (magnetometers, altimeters, radiometic crystal packages, navigational systems) throughout the survey and were collected in a normal length of time with no long delays between survey beginning and end. 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:

Loss of data due to poor transmission, channel dropout, obvious spiking, missing channels, and other obvious errors were replaced with one of the Following values: -9999.9, -999.9, -99, etc. Sometimes channels were added and filled with dummy values (-9999.9, etc.) to comply with the established format. Records that had no usable data were deleted.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Flight Path Recovery The horizontal position of the survey aircraft used to collect data was 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.

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. Barometric altimeter data are not available for most of these data sets. Radar altimeters are estimated to have an error of 2-5% of the altitude (Richard Hansen, PRJ, Inc., written communication). The magnetometer was carried in a bird towed on a line about 60 or 100 feet 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 less than the length of the line but remains constant for the survey.

Lineage:

Process_Step:

Process_Description:

Conversion of measured values to geographic position and magnetic and radiometric values was performed by the contractor using industry standard practices. Details are found under Attribute Accuracy Report, Horizontal_Position_Accuracy_Report, and Vertical_Position_Accuracy_Report Conversion processes, if reported, may be found in the U.S. Department of Energy's published GJO- or GJBX- reports for the quadrangle or group of quadrangles. Unpublished products generated by the contractor included magnetic tapes and perhaps some written documentation.

Process_Date: 1978

Process_Step:

Process_Description:

USGS reformatting of contractor data to standard format. USGS personnel used the software package Oasis Montaj version 6.3 by Geosoft, Inc., to read in the original contractor's data. Positioning and magnetic values were checked for obvious errors or spikes. Values of -9999.9,-999.9, -99.9, etc., were given where the value could not be reasonably corrected or, in some cases, the whole record was removed. Information that was missing from the data file but recorded elsewhere, such as year flown, was added th the file. The radiometric data were not checked for errors except for dummy values which were replaced with -99.9, -999.9, etc. The reformatted data files were written in the format described in the section on Entity_and_Attribute_Overview.

Process_Date: 2008

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

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.0001
Longitude_Resolution: 0.0001
Geographic_Coordinate_Units: decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6,378,206.4
Denominator_of_Flattening_Ratio: 294.98

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name: National Geodetic Vertical Datum of 1929
Altitude_Resolution: 0.1
Altitude_Distance_Units: meters
Altitude_Encoding_Method:

Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

Airborne survey specifications These items are constant for the entire survey Project number: 6005 Project name: Southeast Arizona Survey flown by: Texas Instruments, Inc. Survey flown for: DOE Grand Junction Office Approx. no. of line miles: 8607 Survey height: 400 ft Altitude method: Draped over terrain Flight-line spacing: 3 miles Flight-line direction: North-South Aircraft used: Douglas DC-3 Airport - arrival: unknown Airport - departure: unknown Magnetometer used: Geometrics G-803 Sensor tow distance: 100 feet Radiometric crystal package volume: 2493 (down) & 415 (up) cu. in.

Entity_and_Attribute_Detail_Citation:

Nettleton, L.L., 1971, Elementary Gravity and Magnetics for Geologists and Seismologists: Society of Exploration Geophysicists Monograph Series No. 1, p. 83-87. Dobrin, M.B., 1976, Introduction to Geophysical Prospecting: New York, McGraw-Hill Book Company, p. 505-517. Grasty, R.L., and Holman, P.B., 1974, Optimum Detector Sizes for Airborne Gamma-ray Surveys: Geological Survey of Canada Paper 74-1, Part B, p. 72-74.

Entity_and_Attribute_Overview:

Aeromagnetics Each record contains the following 12 attributes: No name contents 1 line flight line number 2 fid fiducial number (integer) 3 time time (hhmmss) 4 day Julian day flown (integer) 5 year year flown (integer) 6 latitude latitude (decimal degrees) 7 longitude longitude (decimal degrees) 8 radalt radar altimeter reading above ground (meters) 9 totmag corrected magnetic value (nT) 10 resmag residual magnetic value (nT) 11 diurnal ground magnetometer value (nT) 12 geology surficial geology beneath flight line (coded)

Entity_and_Attribute_Detail_Citation:

Detailed_Description:

Entity_Type:

Entity_Type_Label: record for one magnetic or radiometric data point
Entity_Type_Definition:

The set of all measurements reported for a magnetic or radiometric data point having the same spatial location.

Entity_Type_Definition_Source:

Standard aeromagnetic and aeroradiometric data collection procedures as written in the contract for survey collection.

Attribute:

Attribute_Label: line
Attribute_Definition: flight line number
Attribute_Definition_Source: often assigned by airborne survey crew
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1
Range_Domain_Maximum: 106
Attribute_Units_of_Measure: alphanumeric value

Attribute:

Attribute_Label: fid
Attribute_Definition:

A fiducial number is a mark which indicates points of simultaneity. It is a user-defined integer used during airborne operations to correlate recording devices (magnetometers) with navigational records (altimeters, camera film, strip charts) that were recorded at the same time.

Attribute_Definition_Source:

Sheriff, R.E., 1984, Encyclopedic dictionary of exploration geophysics: Tulsa, OK, Society of Exploration Geophysicists, p. 89.

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 88723

Attribute:

Attribute_Label: time
Attribute_Definition:

time of data point collection. Time is given in either local time or Greenwich Meridian Time. Values of 9999 indicate missing data.

Attribute_Definition_Source: self evident
Attribute_Domain_Values:

Unrepresentable_Domain:

a range of time of day values has no meaning because the timeframe can span several days or weeks.

Attribute:

Attribute_Label: day
Attribute_Definition:

Julian day, where Jan. 1 = 1 and Dec. 31 = 365 or 366 (leap year)

Attribute_Definition_Source: self evident
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 11
Range_Domain_Maximum: 346

Attribute_Value_Accuracy_Information:

Attribute_Value_Accuracy: 1
Attribute_Value_Accuracy_Explanation: Both beginning and end Julian dates were taken from dataset.

Attribute:

Attribute_Label: year
Attribute_Definition: year of data point collection
Attribute_Definition_Source: self evident
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1974
Range_Domain_Maximum: 1975

Attribute:

Attribute_Label: latitude
Attribute_Definition: latitude - geographic coordinate
Attribute_Definition_Source: self evident
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 31.3333
Range_Domain_Maximum: 33.5574
Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: longitude
Attribute_Definition: longitude - geographic coordinate
Attribute_Definition_Source: self evident
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -111.7227
Range_Domain_Maximum: -109.0333
Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: radaralt
Attribute_Definition:

radar altimetry reading, in meters An aircraft navigational system in which short electromagnetic waves are transmitted, and the energy scattered back by reflection is detected. From this measurement, the distance between the aircraft and the ground is calculated and recorded as radar altimetry. Values of -999.9 indicate missing data.

Attribute_Definition_Source:

Sheriff, R.E., 1984, Encyclopedic dictionary of exploration geophysics: Tulsa, OK, Society of Exploration Geophysicists, p. 89.

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 45.1
Range_Domain_Maximum: 1047.9
Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: totmag
Attribute_Definition:

Raw magnetic value with base magnetometer corrections applied. Because the magnetic field of the earth varies diurnally, a stationary base magnetometer is maintained on the ground during airborne surveying. The base magnetometer records changes in the magnetic field (in nanoTeslas) as a function of time. The magnetic changes may have an amplitude of 20 to 50 nanoTeslas. If changes are more severe, as would occur from a magnetic storm, surveying is discontinued or the data recorded are not used. Diurnal variations are then removed from the airborne magnetic data based on the common time. Records containing missing data were usually deleted.

Attribute_Definition_Source:

see: 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: 48035.0
Range_Domain_Maximum: 57224.0
Attribute_Units_of_Measure: nanoTeslas

Attribute_Value_Accuracy_Information:

Attribute_Value_Accuracy: 2
Attribute_Value_Accuracy_Explanation:

The airborne magnetometer is accurate to about 1 nanoTesla, and the base magnetometer has the same accuracy. The accuracy of the base-corrected airborne value therefore is near 2 nanoTeslas or better.

Attribute_Measurement_Frequency:

The magnetometer has a recharging interval of 0.5 seconds. The data were recorded at 2 second intervals.

Attribute:

Attribute_Label: resmag
Attribute_Definition:

residual magnetic value 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. For this survey, the field removed is IGRF 1965. Some contractors add a constant to the residual value in order to avoid negative values. This constant can vary from one data set to another. Values of -9999.9 indicate missing data.

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.

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -9999.9
Range_Domain_Maximum: -9999.9
Attribute_Units_of_Measure: nanoTeslas

Attribute_Value_Accuracy_Information:

Attribute_Value_Accuracy: 2
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 vayring degrees of accuracy in determining the local reference field.

Attribute:

Attribute_Label: diurnal
Attribute_Definition:

Base magnetometer values used to correct the total magnetic value. Because the magnetic field of the earth varies diurnally, a stationary base magnetometer is maintained on the ground during airborne surveying. The base magnetometer records changes in the magnetic field (in nanoTeslas) as a function of time called the diurnal. The magnetic changes may have an amplitude of 20 to 50 nanoTeslas. The diurnal is monitored during the survey and if changes are severe, as would occur from a magnetic storm, surveying is discontinued or the data recorded are not used. Diurnal variations are then removed from the airborne magnetic data based on the common time. Values of -9999.9 indicate missing data.

Attribute_Definition_Source:

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -9999.9
Range_Domain_Maximum: -9999.9
Attribute_Units_of_Measure: nanoTeslas

Attribute_Value_Accuracy_Information:

Attribute_Value_Accuracy: 2
Attribute_Value_Accuracy_Explanation:

Attribute_Measurement_Frequency:

The base magnetometer has a recharging interval of 0.5 seconds. The data were recorded at 2-4 second intervals.

Attribute:

Attribute_Label: geology
Attribute_Definition:

Geologic identification codes or numeric codes indicating the rock types immediately beneath the flight line. These codes were determined by plotting the flight lines on a surficial geologic map. A description of the codes can be found in the GJBX- or GJO- report for this quadrangle listed in the Cross Reference section above. Values of -99 indicate missing data.

Attribute_Definition_Source: original publication
Attribute_Domain_Values:

Unrepresentable_Domain: values are not quantified

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

Web site administration: U.S Geological Survey Central Publications Group

Contact_Address:

Address_Type: mailing address
Address:

Central Publications Group
USGS MS 902, Box 25046 DFC

City: Denver
State_or_Province: CO
Postal_Code: 80225-0046

Contact_Voice_Telephone: 303-236-5486

Resource_Description: USGS Open-File Report OFR 2009-1129
Distribution_Liability:

Although all data published on this web site 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.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ASCII
Format_Specification:

Magnetic data file Each line contains data in the following format, beginning with line 1 (no header included): line I6 fid I8 time I8 day I5 year I6 latitude F10.4 longitude F11.4 radalt F7.1 totmag F9.1 resmag F9.1 diurnal F9.1 geology A10 Radiometric data file Radiometric data are not included in this data set.

File_Decompression_Technique: gunzip
Format_Version_Number: 2.1

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: http://pubs.usgs.gov/of/2009/1129

Fees: none

Metadata_Reference_Information:

Metadata_Date: 20201110
Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: USGS Gravity and Magnetics contact

Contact_Address:

Address_Type: mailing address
Address:

U.S. Geological Survey
Box 25046 Mail Stop 964
Denver Federal Center

City: Denver
State_or_Province: CO
Postal_Code: 80225-0046

Contact_Voice_Telephone: 303-236-5652

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

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