Airborne geophysical survey: Southeast Virginia

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey and the Department of Interior
Publication_Date: 2012
Title: Airborne geophysical survey: Southeast Virginia
Geospatial_Data_Presentation_Form: analog contour map
Online_Linkage:
https://mrdata.usgs.gov/magnetic/show-survey.php?id=VA3010_pg.shp
Description:
Abstract:
Aeromagnetic data were collected along flight lines by instruments in an aircraft that recorded magnetic-field values and locations. In the earlier days of surveying, the only way to represent this data was to generate an analog map with contour lines. This dataset is a representation of the digitized contour lines either by following the lines or by choosing the intersection of the contour and flight-line to create a value of the magnetic field. The values presented are latitude, longitude, and map magnetic-field values.
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: 197204
Ending_Date: 197205
Currentness_Reference: ground condition
Status:
Progress: complete
Maintenance_and_Update_Frequency: none planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -78.00
East_Bounding_Coordinate: -75.23
North_Bounding_Coordinate: 38.04
South_Bounding_Coordinate: 36.57
Data_Set_G-Polygon:
Data_Set_G-Polygon_Outer_G-Ring:
G-Ring:
-75.23 38.04, -75.92 37.12, -76.27 37.12, -76.25 36.95, -76.00 36.94, -75.88 36.57, -78.00 36.57, -78.00 36.88, -77.75 36.88, -77.75 37.88, -76.25 37.88, -75.95 37.93, -75.23 38.04
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:28e7b04f-4144-46a2-ba1c-560a57f76b2c
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:
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: none
Place_Keyword: United States
Place_Keyword: Virginia
Place_Keyword: VA
Place:
Place_Keyword_Thesaurus: Common Geographic Areas
Place_Keyword: f24037 = Saint Mary's
Place_Keyword: f24039 = Somerset
Place_Keyword: f24047 = Worcester
Place_Keyword: f37029 = Camden
Place_Keyword: f37053 = Currituck
Place_Keyword: f37073 = Gates
Place_Keyword: f37091 = Hertford
Place_Keyword: f37131 = Northampton
Place_Keyword: f37185 = Warren
Place_Keyword: f51001 = Accomack
Place_Keyword: f51007 = Amelia
Place_Keyword: f51025 = Brunswick
Place_Keyword: f51033 = Caroline
Place_Keyword: f51036 = Charles City
Place_Keyword: f51041 = Chesterfield
Place_Keyword: f51053 = Dinwiddie
Place_Keyword: f51057 = Essex
Place_Keyword: f51073 = Gloucester
Place_Keyword: f51075 = Goochland
Place_Keyword: f51081 = Greensville
Place_Keyword: f51085 = Hanover
Place_Keyword: f51087 = Henrico
Place_Keyword: f51093 = Isle of Wight
Place_Keyword: f51095 = James City
Place_Keyword: f51097 = King and Queen
Place_Keyword: f51101 = King William
Place_Keyword: f51103 = Lancaster
Place_Keyword: f51109 = Louisa
Place_Keyword: f51115 = Mathews
Place_Keyword: f51119 = Middlesex
Place_Keyword: f51127 = New Kent
Place_Keyword: f51131 = Northampton
Place_Keyword: f51133 = Northumberland
Place_Keyword: f51145 = Powhatan
Place_Keyword: f51149 = Prince George
Place_Keyword: f51159 = Richmond
Place_Keyword: f51175 = Southampton
Place_Keyword: f51181 = Surry
Place_Keyword: f51183 = Sussex
Place_Keyword: f51199 = York
Place_Keyword: f51550 = Chesapeake
Place_Keyword: f51570 = Colonial Heights
Place_Keyword: f51595 = Emporia
Place_Keyword: f51620 = Franklin
Place_Keyword: f51650 = Hampton
Place_Keyword: f51670 = Hopewell
Place_Keyword: f51700 = Newport News
Place_Keyword: f51710 = Norfolk
Place_Keyword: f51730 = Petersburg
Place_Keyword: f51735 = Poquoson
Place_Keyword: f51740 = Portsmouth
Place_Keyword: f51760 = Richmond
Place_Keyword: f51800 = Suffolk
Place_Keyword: f51810 = Virginia Beach
Place_Keyword: f51830 = Williamsburg
Access_Constraints: none
Use_Constraints:
none. Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from these data.
Browse_Graphic:
Browse_Graphic_File_Name:
http://mrdata.usgs.gov/geophysics/surveys/geophysics3/VA/va3010.jpg
Browse_Graphic_File_Description:
Reduced-size image depicting the data, 1118 x 887 pixels, 218,558 bytes
Browse_Graphic_File_Type: JPEG
Data_Set_Credit:
These USGS employees contributed to reformatting and archiving these data: Viki Bankey, Pat Hill, Holly Hindle, Bob Kucks, Sarah Shearer, Esther Castellanous
Cross_Reference:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 1972
Title: Aeromagnetic map of southeastern Virginia
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: OFR 72-389
Publication_Information:
Publication_Place: Denver, CO
Publisher: U.S. Geological Survey
Other_Citation_Details: map scale 1:250,000
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The data shown on the original map 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 on the original map 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, navigational systems) throughout the survey and were collected in a normal length of time with no long delays between survey beginning and end. Survey layout 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: Data is complete as reasonably digitized from the original map
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Flight Path Recovery 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.
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:
Conversion of measured values to geographic position and magnetic values was performed by the processors using industry standard practices. Details are found under Horizontal_Position_Accuracy_Report, and Vertical_Position_Accuracy_Report Unless noted, conversion processes were not documented. Products may include some written documentation.
Process_Date: 1972
Process_Step:
Process_Description:
USGS digitized original map to ASCII format. USGS personnel used the software package Oasis Montaj by Geosoft, Inc., to read in the ASCII digitized data and create raster JPEG images.
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
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
Airborne survey specifications These items are constant for the entire survey Project number: 3010 Project name: Southeast Virginia Survey flown by: Geoterrex Survey flown for: U.S. Geological Survey Approx. no. of line miles: 5700 Survey height: 500 ft Altitude method: Above ground Flight-line spacing: 2.0 mi Flight-line direction: E-W Aircraft used: unknown Airport - arrival: unknown Airport - departure: unknown Sensor tow distance: unknown Magnetometer used: unknown Data recording interval: unknown Regional field removed: IGRF65 removed with a 51400 nT datum
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. Dobrin, M.B., 1976, Introduction to Geophysical Prospecting: New York, McGraw-Hill Book Company, Sheriff, R.E., 1984, Encyclopedic dictionary of exploration geophysics: Tulsa, OK, Society of Exploration Geophysicists.
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
Distribution_Liability:
Although all data published on this website 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:
Each line contains data in the following format, beginning with line 1 (no header included): longitude F12.4 Longitude in decimal degrees latitude F12.4 Latitude in decimal degrees mag F8.1 Magnetic value represented on map. This is the residual field value
Format_Version_Date: 1998
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://crustal.usgs.gov/geophysics/index.html for link to report
Fees: none
Distribution_Information:
Distributor:
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
Resource_Description: va3010_meta.txt
Distribution_Liability:
This dataset was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: CSV
Format_Information_Content: Flight-line airborne magnetic anomaly measurements
File_Decompression_Technique: none
Transfer_Size: 8.2534408569336
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://mrdata.usgs.gov/geophysics/surveys/geophysics3/VA/va3010.txt
Fees: none
Metadata_Reference_Information:
Metadata_Date: 20201110
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: USGS Crustal Geophysics and Geochemistry Science Center
Contact_Address:
Address_Type: mailing address
Address:
Magnetic and Gravity Information
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: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
This page is <https://mrdata.usgs.gov/geophysics/surveys/waf/VA3010_META.html>
Generated by mp version 2.9.50 on Wed Jun 23 11:45:00 2021