Airborne geophysical survey: Offshore East Coast Tie Lines, United States

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U.S. Geological Survey, Department of Interior and the National Geophysical Data Center, NOAA
Publication_Date: 2012
Airborne geophysical survey: Offshore East Coast Tie Lines, United States
Geospatial_Data_Presentation_Form: tabular digital data
Aeromagnetic data were collected along flight lines by instruments in an aircraft that recorded magnetic-field values and locations. This dataset presents latitude, longitude, altitude, and magnetic-field values.
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.
Beginning_Date: 19741219
Ending_Date: 19751214
Currentness_Reference: ground condition
Progress: complete
Maintenance_and_Update_Frequency: none planned
West_Bounding_Coordinate: -81.40
East_Bounding_Coordinate: -65.58
North_Bounding_Coordinate: 41.92
South_Bounding_Coordinate: 27.61
-73.32 40.71, -69.65 41.92, -68.10 40.16, -66.32 41.00, -65.58 39.70, -75.23 32.64, -76.61 28.53, -76.50 27.96, -79.57 27.61, -81.40 30.08, -81.17 31.71, -79.06 33.45, -75.56 35.64, -75.96 37.03, -74.00 40.33, -73.32 40.71
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:446d3fd8-08ce-4f3a-b5e9-438efece00a5
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_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_Keyword_Thesaurus: none
Place_Keyword: United States
Place_Keyword: US
Place_Keyword: Atlantic Ocean
Place_Keyword: East Coast
Place_Keyword_Thesaurus: Common Geographic Areas
Place_Keyword: f10001 = Kent
Place_Keyword: f10005 = Sussex
Place_Keyword: f12009 = Brevard
Place_Keyword: f12031 = Duval
Place_Keyword: f12035 = Flagler
Place_Keyword: f12089 = Nassau
Place_Keyword: f12109 = Saint Johns
Place_Keyword: f12127 = Volusia
Place_Keyword: f13029 = Bryan
Place_Keyword: f13039 = Camden
Place_Keyword: f13051 = Chatham
Place_Keyword: f13127 = Glynn
Place_Keyword: f13179 = Liberty
Place_Keyword: f13191 = McIntosh
Place_Keyword: f24039 = Somerset
Place_Keyword: f24045 = Wicomico
Place_Keyword: f24047 = Worcester
Place_Keyword: f25001 = Barnstable
Place_Keyword: f25005 = Bristol
Place_Keyword: f25007 = Dukes
Place_Keyword: f25019 = Nantucket
Place_Keyword: f25023 = Plymouth
Place_Keyword: f34001 = Atlantic
Place_Keyword: f34005 = Burlington
Place_Keyword: f34009 = Cape May
Place_Keyword: f34011 = Cumberland
Place_Keyword: f34025 = Monmouth
Place_Keyword: f34029 = Ocean
Place_Keyword: f36059 = Nassau
Place_Keyword: f36103 = Suffolk
Place_Keyword: f37013 = Beaufort
Place_Keyword: f37015 = Bertie
Place_Keyword: f37017 = Bladen
Place_Keyword: f37019 = Brunswick
Place_Keyword: f37029 = Camden
Place_Keyword: f37031 = Carteret
Place_Keyword: f37041 = Chowan
Place_Keyword: f37047 = Columbus
Place_Keyword: f37049 = Craven
Place_Keyword: f37051 = Cumberland
Place_Keyword: f37053 = Currituck
Place_Keyword: f37055 = Dare
Place_Keyword: f37061 = Duplin
Place_Keyword: f37065 = Edgecombe
Place_Keyword: f37073 = Gates
Place_Keyword: f37079 = Greene
Place_Keyword: f37083 = Halifax
Place_Keyword: f37091 = Hertford
Place_Keyword: f37095 = Hyde
Place_Keyword: f37101 = Johnston
Place_Keyword: f37103 = Jones
Place_Keyword: f37107 = Lenoir
Place_Keyword: f37117 = Martin
Place_Keyword: f37129 = New Hanover
Place_Keyword: f37131 = Northampton
Place_Keyword: f37133 = Onslow
Place_Keyword: f37137 = Pamlico
Place_Keyword: f37139 = Pasquotank
Place_Keyword: f37141 = Pender
Place_Keyword: f37143 = Perquimans
Place_Keyword: f37147 = Pitt
Place_Keyword: f37155 = Robeson
Place_Keyword: f37163 = Sampson
Place_Keyword: f37177 = Tyrrell
Place_Keyword: f37187 = Washington
Place_Keyword: f37191 = Wayne
Place_Keyword: f37195 = Wilson
Place_Keyword: f44005 = Newport
Place_Keyword: f44009 = Washington
Place_Keyword: f45013 = Beaufort
Place_Keyword: f45015 = Berkeley
Place_Keyword: f45019 = Charleston
Place_Keyword: f45029 = Colleton
Place_Keyword: f45033 = Dillon
Place_Keyword: f45035 = Dorchester
Place_Keyword: f45041 = Florence
Place_Keyword: f45043 = Georgetown
Place_Keyword: f45051 = Horry
Place_Keyword: f45053 = Jasper
Place_Keyword: f45067 = Marion
Place_Keyword: f45089 = Williamsburg
Place_Keyword: f51001 = Accomack
Place_Keyword: f51073 = Gloucester
Place_Keyword: f51093 = Isle of Wight
Place_Keyword: f51095 = James City
Place_Keyword: f51103 = Lancaster
Place_Keyword: f51115 = Mathews
Place_Keyword: f51119 = Middlesex
Place_Keyword: f51131 = Northampton
Place_Keyword: f51133 = Northumberland
Place_Keyword: f51175 = Southampton
Place_Keyword: f51181 = Surry
Place_Keyword: f51199 = York
Place_Keyword: f51550 = Chesapeake
Place_Keyword: f51620 = Franklin
Place_Keyword: f51650 = Hampton
Place_Keyword: f51700 = Newport News
Place_Keyword: f51710 = Norfolk
Place_Keyword: f51735 = Poquoson
Place_Keyword: f51740 = Portsmouth
Place_Keyword: f51800 = Suffolk
Place_Keyword: f51810 = Virginia Beach
Access_Constraints: none
none. Acknowledgement of the U.S. Geological Survey and the National Geophysical Data Center would be appreciated in products derived from these data.
Browse_Graphic_File_Name: Browse_Graphic_File_Description:
Reduced-size image depicting the data, 637 x 683 pixels, 195,993 bytes
Browse_Graphic_File_Type: JPEG
These USGS employees contributed to reformatting and archiving these data: Viki Bankey, David Daniels, Carol Finn, Pat Hill, Holly Hindle, Bob Kucks, Vicki Rystrom, Sarah Shearer Cooperating contributors from the National Geophysical Data Center are: Ronald Buhmann, David Dater, Susan McLean, Stewart Racey
These data were originally recorded on 9-track magnetic tapes and were transferred to CD-ROM. Data processing took place on an HP workstation and a Dell personal computer running a Windows NT or XP operating system. Data were reformatted using the Geosoft, Inc., Oasis Montaj program.
Originator: U.S. Geological Survey
Publication_Date: 1979
High resolution aeromagnetic anomaly map of the U.S. Atlantic continental margin, GP-931
Geospatial_Data_Presentation_Form: map
Series_Name: U.S. Geological Survey Geophysical Investigations Map
Issue_Identification: GP-931
Publication_Place: Denver, CO
Publisher: U.S. Geological Survey
by J.C. Behrendt and K.D. Klitgord, 2 sheets, scale 1:1,000,000
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.
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, 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.
Loss of data due to poor transmission, channel dropout, obvious spiking, missing channels, and other obvious errors were replaced with the value -9999.9, such as in the radar and barom channels. Sometimes channels were added and filled with dummy values (-9999.9) to comply with the established format. Some records that had no usable data were deleted. The line numbers were significantly altered to preserve line segments, to be compatible to the other surveys in this series, and to conform to the established template. The formula used was: subtract 1000, add 400 and multiply by 10. This data set contains all the tie lines for Projects 3063B, 3063C, 3063D, 3063E, and 3063A. The fiducial value (fiducial) was reset for each line.
Flight Path Recovery Horizontal positions 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.
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) This data set was collected at a constant barometric altitude of 1500 ft. above the ocean surface. The magnetometer was carried in a "stinger" attached to the aircraft.
Conversion of measured values to geographic position and magnetic values was performed by the contractor using industry standard practices. Details are found under Horizontal_Position_Accuracy_Report, and Vertical_Position_Accuracy_Report Unless noted, conversion processes were not reported to the USGS. Unpublished products generated by the contractor included magnetic tapes, a map of residual or total field magnetics, and perhaps some written documentation.
Process_Date: 1975
USGS reformatting of contractor data to standard format. USGS personnel used the software package Oasis Montaj by Geosoft, Inc., to read in the original contractor's data. Latitude, longitude, altitude, and magnetic values were checked for obvious errors or spikes and values of -9999.9 were given where the value could not be reasonably corrected. Other errors in the data were not corrected. Horizontal positions were converted to latitude and longitude if the original values were UTM meters. Elevations were converted from meters to feet (1 m = 3.2808 ft). Often the digital data did not contain date information and only the month and year flown or just a starting date were stated in the written documentation. In these cases, the first day of the month or the date the survey began was used as the Julian date and added to the digital data. Other information was added that was missing from the data file but was recorded elsewhere. The reformatted data were written in the format described in the section on Digital_Transfer_Information.
Process_Date: 200302
Added keywords section with USGS persistent identifier as theme keyword.
Process_Date: 20201110
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
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
Direct_Spatial_Reference_Method: point
Latitude_Resolution: 0.0001
Longitude_Resolution: 0.0001
Geographic_Coordinate_Units: decimal degrees
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
Altitude_Datum_Name: National Geodetic Vertical Datum of 1929
Altitude_Resolution: 1
Altitude_Distance_Units: feet
Explicit elevation coordinate included with horizontal coordinates
Airborne survey specifications These items are constant for the entire survey Project number: 3063G Project name: Offshore East Coast Tie Lines, U.S. Survey flown by: LKB Resources, Inc. Survey flown for: U.S. Geological Survey Approx. no. of line miles: approximately 8500 Survey height: 1500 ft Altitude method: constant barometric elevation Flight-line spacing: variable Flight-line direction: NE-SW Aircraft used: Aero Commander and Douglas DC-3 Airport - arrival: various Airport - departure: various Sensor tow distance: 0 (stinger) Magnetometer used: helium vapor Data recording interval: 1 second Regional field removed: DGRF using 15 second terrain data
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.
Web site administration: U.S Geological Survey Publishing Service Center
Address_Type: mailing address
Publishing Service Center
USGS MS 902, Box 25046 DFC
City: Denver
State_or_Province: CO
Postal_Code: 80225-0046
Contact_Voice_Telephone: 303-236-5486
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.
Format_Name: ASCII
Each line contains data in the following format, beginning with line 1 (no header included): line_no I5 flight line number directn I4 flight line direction, azimuth degrees from north longitud F11.4 longitude (decimal degrees) latitude F9.4 latitude (decimal degrees) year I5 year flown jul_day I4 Julian day flown fiducial I7 fiducial number radar F8.1 radar altitude above ground (feet) barom F8.1 barometric altitude above mean sea level (feet) totmag F9.2 corrected total field magnetic value (nT) resmag F9.2, 1X residual magnetic value (nT)
File_Decompression_Technique: gunzip
Format_Version_Number: 4.1
Fees: none
Contact_Person: Peter N Schweitzer
Contact_Organization: USGS Eastern Mineral and Environmental Resources Science Center
Contact_Position: Geologist
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
Resource_Description: US_3063G_meta.txt
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.
Format_Name: CSV
Format_Information_Content: Flight-line airborne magnetic anomaly measurements
File_Decompression_Technique: unzip
Transfer_Size: 3.3190383911133
Fees: none
Metadata_Date: 20201110
Contact_Organization: USGS Crustal Geophysics and Geochemistry Science Center
Address_Type: mailing 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

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