Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 2014 Title: Airborne geophysical survey: Michigan Coop South '63 Online_Linkage: https://mrdata.usgs.gov/magnetic/show-survey.php?id=MI0518a_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: Single_Date/Time: Calendar_Date: 196308 Currentness_Reference: ground condition Status: Progress: complete Maintenance_and_Update_Frequency: none planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -89.502082824707 East_Bounding_Coordinate: -88.999069213867 North_Bounding_Coordinate: 46.990825653076 South_Bounding_Coordinate: 46.111309051514 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:a0a2d52d-1f4b-4e1c-a9b2-5968ffd78c72 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: f26053 = Gogebic Place_Keyword: f26131 = Ontonagon Place_Keyword: f55125 = Vilas Access_Constraints: none Use_Constraints: none Browse_Graphic: Browse_Graphic_File_Name: http://mrdata.usgs.gov/geophysics/surveys/geophysics3/MI-WI/mi-wi0518a.jpg Browse_Graphic_File_Description: Reduced-size image depicting the data, 812 x 1419 pixels, 228,483 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: U.S. Geological Survey Publication_Date: 1972 Title: Aeromagnetic map of the Watersmeet region, Ontonagon and Gogebic counties, Michigan, and Vilas County, Wisconsin Series_Information: Series_Name: Geophysical Investigation Map Issue_Identification: 831 Online_Linkage: http://pubs.usgs.gov/gp/0831/report.pdf Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1972 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: U.S. Geological Survey Publication_Date: 1972 Title: Aeromagnetic map of northwestern Ontonagon County, Michigan Series_Information: Series_Name: Geophysical Investigation Map Issue_Identification: 834 Online_Linkage: http://pubs.usgs.gov/gp/0834/report.pdf Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1972 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 08/63 direction N-S at altitude 500 AG with spacing 0.25 mi. for a total of 2200 line miles Process_Date: 196308 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 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 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: mi-wi0518a.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: 0.4511604309082 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://mrdata.usgs.gov/geophysics/surveys/geophysics3/MI-WI/mi-wi0518a.txt Fees: none Metadata_Reference_Information: Metadata_Date: 20201110 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