Airborne geophysical survey: Area A, Central Washington

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Metadata:

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Entity_and_Attribute_Information
Distribution_Information
Distribution_Information
Metadata_Reference_Information

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: Area A, Central Washington
Geospatial_Data_Presentation_Form: tabular digital data
Online_Linkage:

https://mrdata.usgs.gov/magnetic/show-survey.php?id=WA_WA02A_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: 19770715
Ending_Date: 19770927

Currentness_Reference: ground condition

Status:

Progress: complete
Maintenance_and_Update_Frequency: none planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -121.07
East_Bounding_Coordinate: -118.55
North_Bounding_Coordinate: 47.30
South_Bounding_Coordinate: 45.77

Data_Set_G-Polygon:

Data_Set_G-Polygon_Outer_G-Ring:

G-Ring:

-120.62 47.30, -120.07 47.03, -120.00 47.08, -119.97 47.07, -119.92 47.12, -119.58 47.00, -119.59 46.96, -119.58 46.92, -119.59 46.83, -119.58 46.78, -119.59 46.76, -118.55 46.12, -118.95 45.77, -121.07 46.91, -120.62 47.30

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:011b39ac-976a-48a7-9af8-ffbf02f327e9

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: Central

Place:

Place_Keyword_Thesaurus: Common Geographic Areas
Place_Keyword: f41059 = Umatilla
Place_Keyword: f53001 = Adams
Place_Keyword: f53005 = Benton
Place_Keyword: f53021 = Franklin
Place_Keyword: f53025 = Grant
Place_Keyword: f53037 = Kittitas
Place_Keyword: f53071 = Walla Walla
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_WA02A.jpg

Browse_Graphic_File_Description:

Reduced-size image depicting the data, 758 x 680 pixels, 231,554 bytes

Browse_Graphic_File_Type: JPEG

Data_Set_Credit:

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

Native_Data_Set_Environment:

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.

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. 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 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 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.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

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.

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 1000 ft. Because aircraft, especially airplanes, 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. 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: 1978

Process_Step:

Process_Description:

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). 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: 201303

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

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name: National Geodetic Vertical Datum of 1929
Altitude_Resolution: 1
Altitude_Distance_Units: feet
Altitude_Encoding_Method:

Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

Airborne survey specifications These items are constant for the entire survey Project number: WA02A Project name: Area A, Central Washington Survey flown by: Aero Survey flown for: Washington Public Power System Approx. no. of line miles: 9582 Survey height: 1000 ft Altitude method: above terrain Flight-line spacing: 0.5 mi Flight-line direction: N40E Aircraft used: Piper Navajo Airport - arrival: Yakima, WA Airport - departure: Yakima, WA Sensor tow distance: unknown Magnetometer used: Varian proton Data recording interval: every 152 feet Regional field removed: none

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:

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

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_WA02A_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: 3.3486204147339

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

http://mrdata.usgs.gov/geophysics/surveys/geophysics2/WA/WA_WA02A.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

This page is <https://mrdata.usgs.gov/geophysics/surveys/waf/WA_WA02A_META.html>