Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey, Department of Interior and the National Geophysical Data Center, NOAA Publication_Date: 2012 Title: Airborne geophysical survey: Mt. Adams, Washington Geospatial_Data_Presentation_Form: tabular digital data Online_Linkage: https://mrdata.usgs.gov/magnetic/show-survey.php?id=WA_4272_pg.shp Description: Abstract: 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. 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: 20020508 Ending_Date: 20020515 Currentness_Reference: ground condition Status: Progress: complete Maintenance_and_Update_Frequency: none planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -121.52 East_Bounding_Coordinate: -121.46 North_Bounding_Coordinate: 46.23 South_Bounding_Coordinate: 46.18 Data_Set_G-Polygon: Data_Set_G-Polygon_Outer_G-Ring: G-Ring: -121.52 46.23, -121.46 46.23, -121.46 46.18, -121.52 46.18, -121.52 46.23 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:a1cfab78-a2d4-4330-83cf-39d64127ca4c 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: Washington Place_Keyword: WA Place_Keyword: Mt. Adams Place: Place_Keyword_Thesaurus: Common Geographic Areas Place_Keyword: f53077 = Yakima Access_Constraints: none Use_Constraints: 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: Browse_Graphic_File_Name: http://mrdata.usgs.gov/geophysics/surveys/geophysics2/WA/WA_4272.jpg Browse_Graphic_File_Description: Reduced-size image depicting the data, 642 x 683 pixels, 171,494 bytes Browse_Graphic_File_Type: JPEG Data_Set_Credit: These USGS employees contributed to reformatting and archiving these data: Bob Kucks, Pat Hill Native_Data_Set_Environment: These data were originally recorded on CD_ROM's. 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. See operations report for discussion on data acquisition and processing. 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, 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 may have been replaced with the value -9999.9. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Horizontal positions of the survey aircraft used to collect data were determined using GPS satellite navigation. 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. 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 as a draped survey having an average terrain clearance of 200 ft. Because aircraft cannot safely maintain a constant terrain clearance, error in vertical position is introduced. Lineage: Process_Step: Process_Description: Conversion of measured values to geographic position and magnetic values was performed by the contractor using industry standard practices. Process_Date: 2002 Process_Step: Process_Description: USGS personnel used the software package Oasis Montaj by Geosoft, Inc., to read in the original contractor's data. Few, if any, corrections were made to the original data. Minor changes may have been made to the original format. A readme.txt file was created to outline the format of the .xyz file. Process_Date: 201208 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 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: Airborne survey specifications These items are constant for the entire survey Project number: 4272 Project name: Mt. Adams, Washington Survey flown by: Fugro Survey flown for: U.S. Geological Survey Approx. no. of line miles: 62 Survey height: 200 ft Altitude method: Draped over terrain Flight-line spacing: 0.155 mi Flight-line direction: E-W Aircraft used: SA315B Lama helicopter Airport - arrival: unknown Airport - departure: unknown Tow cable length: 100 feet Magnetometer used: Geometrics 822 cesium vapor Data recording interval: 0.1 second Regional field removed: IGRF 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 Publishing Service Center Contact_Address: Address_Type: mailing address 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 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: See the project readme.txt file for the data format. File_Decompression_Technique: gunzip Format_Version_Number: unknown 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: WA_4272_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: unzip Transfer_Size: 0.45117664337158 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://mrdata.usgs.gov/geophysics/surveys/geophysics2/WA/WA_4272.zip 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