Airborne geophysical survey: Berwick '55

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 2014
Title: Airborne geophysical survey: Berwick '55
Online_Linkage:
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:
Single_Date/Time:
Calendar_Date: 195509
Currentness_Reference: ground condition
Status:
Progress: complete
Maintenance_and_Update_Frequency: none planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -71.000671386719
East_Bounding_Coordinate: -70.747886657715
North_Bounding_Coordinate: 43.495971679688
South_Bounding_Coordinate: 43.256313323975
Keywords:
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: Common Geographic Areas
Place_Keyword: f23031 = York
Place_Keyword: f33017 = Strafford
Access_Constraints: none
Use_Constraints: none
Browse_Graphic:
Browse_Graphic_File_Name: Browse_Graphic_File_Description:
Reduced-size image depicting the data, 1118 x 1249 pixels, 125,009 bytes
Browse_Graphic_File_Type: JPEG
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Because these data were digitized from printed contour maps that were drawn originally by researchers who produced the source materials, the values presented here should be regarded as approximate and faithful to the published interpretation (contouring) of the original instrument data. Factors affecting accuracy include the accuracy and precision of the original aircraft flight line navigation and elevation as well as the calibration of the instruments used to measure the magnetic field.
Logical_Consistency_Report:
In general each original map shows data collected by a single contractor or group responsible for collecting and processing the field observations, and reflect industry standard practices and controls as of the time period when the maps were published. Variation among surveys is possible, especially if they were carried out during very different time periods.
Completeness_Report:
Contouring, and subsequently digitizing of the contours, covered areas that included original flight line data, so these data may not extend into all parts of the original map extents.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
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:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Bromery, Randolph Wilson, Zandle, G.L.
Publication_Date: 1956
Title:
Aeromagnetic map of the Alton quadrangle, New Hampshire; Total intensity relative to arbitrary datum
Series_Information:
Series_Name: Geophysical Investigation Map
Issue_Identification: 136
Online_Linkage: http://pubs.usgs.gov/gp/0136/report.pdf
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1956
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: paper
Source_Contribution:
Contours of magnetic anomaly and, where available, flight lines were digitized from this source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Bromery, Randolph Wilson, Zandle, G.L.
Publication_Date: 1956
Title:
Aeromagnetic map of Berwick quadrangle, Maine and New Hampshire; Total intensity relative to arbitrary datum
Series_Information:
Series_Name: Geophysical Investigation Map
Issue_Identification: 137
Online_Linkage: http://pubs.usgs.gov/gp/0137/report.pdf
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1956
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: paper
Source_Contribution:
Contours of magnetic anomaly and, where available, flight lines were digitized from this source
Process_Step:
Process_Description:
Aeromagnetic survey flown by USGS in the time period 09/55 direction E-W at altitude 750 AG with spacing 0.5 mi. for a total of 800 line miles
Process_Date: 195509
Process_Step:
Process_Description:
USGS digitized original paper map to ASCII format points. 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: 2000 or later
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Entity 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: 6378206.4
Denominator_of_Flattening_Ratio: 294.98
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
Generally these data files contain columnar text consisting of a longitude, latitude, and magnetic anomaly value in nanoTeslas. Where the data files have more columns the package should include a text file explaining the additional columns; that arrangement applies to data recorded originally in digital format, and includes some of the intermediate measurements and calculated parameters such as the total magnetic field.
Entity_and_Attribute_Detail_Citation: http://pubs.usgs.gov/of/1999/ofr-99-0557/readme.htm
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey, Mineral Resources Program
Contact_Person: Peter N. Schweitzer
Contact_Address:
Address_Type: mailing address
Address: Mail Stop 954 USGS National Center, 12201 Sunrise Valley Drive
City: Reston
State_or_Province: Virginia
Postal_Code: 20192
Contact_Voice_Telephone: 703-648-6533
Contact_Facsimile_Telephone: 703-648-6252
Contact_Electronic_Mail_Address: pschweitzer@usgs.gov
Resource_Description: nh-me0213.txt
Distribution_Liability:
Reference herein to any specific commercial product, process, or service by trade name,trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: CSV
Format_Version_Number: 1.0
Format_Information_Content:
Flight-line airborne magnetic anomaly measurements, digitized from paper
File_Decompression_Technique: none
Transfer_Size: 0.084531784057617
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Fees: none
Metadata_Reference_Information:
Metadata_Date: 20141205
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey, Mineral Resources Program
Contact_Person: Peter N. Schweitzer
Contact_Address:
Address_Type: mailing address
Address: Mail Stop 954 USGS National Center, 12201 Sunrise Valley Drive
City: Reston
State_or_Province: Virginia
Postal_Code: 20192
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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