Marine magnetic data from Point Sur to Piedras Blancas, central California, 2011

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Janet T. Watt
Originator: Stephen R. Hartwell
Originator: Samuel Y. Johnson
Publication_Date: 2018
Title:
Marine magnetic data from Point Sur to Piedras Blancas, central California, 2011
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/F7FB51F7
Publication_Information:
Publication_Place: Santa Cruz, CA
Publisher:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Online_Linkage: https://doi.org/10.5066/F7FB51F7
Online_Linkage:
Description:
Abstract:
This dataset includes marine magnetic data collected by the U.S. Geological Survey (USGS) in 2011 during field activity B-05-11-CC between Point Sur and Piedras Blancas, central California.
Purpose:
These data and information are intended for science researchers, students from elementary through college, policy makers, and general public.
Supplemental_Information:
Additional information about the field activity from which these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=B0511CC Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20110912
Ending_Date: 20110926
Currentness_Reference: ground condition at the time the data were collected
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -121.912539
East_Bounding_Coordinate: -121.316979
North_Bounding_Coordinate: 36.265058
South_Bounding_Coordinate: 35.649101
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:593f01b7e4b0764e6c61bb92
Theme:
Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: continental margin
Theme_Keyword: magnetic field observations
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation
Theme_Keyword: oceans
Theme:
Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: substrate
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: sea-floor characteristics
Theme_Keyword: magnetic field (earth)
Theme_Keyword: geophysics
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: magnetic anomaly
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: CMGP
Theme_Keyword: Pacific Coastal and Marine Science Center
Theme_Keyword: PCMSC
Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Pacific Ocean
Place_Keyword: State of California
Place_Keyword: Monterey County
Place_Keyword: Lucia
Place_Keyword: Plaskett
Place_Keyword: Big Sur
Place_Keyword: Point Sur
Place_Keyword: Pfeiffer Beach
Access_Constraints: None.
Use_Constraints:
USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Janet T. Watt
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Country: USA
Contact_Voice_Telephone: (831) 460-7565
Contact_Facsimile_Telephone: (831) 427-4748
Contact_Electronic_Mail_Address: jwatt@usgs.gov
Native_Data_Set_Environment: Digital, ASCII
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: Identified as best available version.
Logical_Consistency_Report: No formal logical accuracy tests were conducted
Completeness_Report:
Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: 10-25 meters, depending on ship speed
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: not applicable for these data
Lineage:
Process_Step:
Process_Description:
Magnetic data were postprocessed following the methodology: 1)Initial Processing in MagMap2000 -Download base files from INTERMAGNET observatory (http://www.intermagnet.org/apps/dl_data_prel_e.php) -Despike base files and visually inspect for dropouts -Apply bias to DIURNAL (base) readings for GMT to local PDT + longitude diff. from base to survey = 7hrs + 0.22hrs =-24,408sec **NOTE: 0.0666667hr/deg longitude correction -Import .survey files, despike
2)Import to Oasis -Remove periodic sparker spike from raw G882 and G882_diurnal channel using a non-linear filter GX = nlfilt (ex. filter width = 3 data points, filter tolerance = 0.3 nt)
3)Calculated IGRF for G882 data
4)Back calculated Base Magnetometer measurements G882filt-DIURNAL_filt = Fresno_base
5)Calculated IGRF value at base station FRN = 48909.6nT
6)Calculated Total Field (Residual) Anomaly using the following equation: A(x) = [F(x,t) - I(x)] - [FB(t) - IB]
where: A(x)is total field anomaly at position x F(x,t) is the G882 reading at time t and position x I(x) is IGRF/DGRF at the G882 FB(t) is the base station reading at time t IB is the IGRF/DGRF at the base station
7)Performed tie line leveling 8) Manually edited a subset of lines (+6 nT) 9) Applied a decorrugation filter "L" lines only (500m line spacing, line azimuth=30 degrees) Following methodology at Geosoft - http://www.geosoft.com/media/uploads/resources/technical-notes/microleveling%20tech%20note.pdf
FILTER PARAMETERS for "L" lines Butterworth filter: cutoff wavelength = 2000 (4 x line spacing) filter order = 8 (suggested) high-pass
Directional Cosine filter: centre direction = 30 (shiptrack azimuth) degree of cosine function = 0.5 (suggested)
Process_Date: 20130627
Process_Step:
Process_Description:
Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed.
Process_Date: 20201019
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: Point
Point_and_Vector_Object_Count: 363903
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.00001
Longitude_Resolution: 0.00001
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257
Vertical_Coordinate_System_Definition:
Depth_System_Definition:
Depth_Datum_Name: Local surface
Depth_Resolution: 0.1
Depth_Distance_Units: meters
Depth_Encoding_Method: Attribute values
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: B-05-11-CC_Magnetic
Entity_Type_Definition: Points representing magnetic anomaly level
Entity_Type_Definition_Source: USGS
Attribute:
Attribute_Label: Line
Attribute_Definition: Survey line identifier
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Unrepresentable_Domain: Each line contained in the survey has a unique identifier
Attribute:
Attribute_Label: Date
Attribute_Definition: Date of data point collection in M/DD/YY format
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 9/14/11
Range_Domain_Maximum: 9/24/11
Attribute:
Attribute_Label: Time
Attribute_Definition: Time of data point collection in HH:MM:SS format
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 00:00:00
Range_Domain_Maximum: 24:00:00
Attribute:
Attribute_Label: lon_n83
Attribute_Definition: Longitude of data point in decimal degrees
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -121.912539
Range_Domain_Maximum: -121.316979
Attribute:
Attribute_Label: lat_n83
Attribute_Definition: Latitude of data point in decimal degrees
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 35.649101
Range_Domain_Maximum: 36.265058
Attribute:
Attribute_Label: x_n83_utm1
Attribute_Definition: X coordinate of data point in meters
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 597709.248127
Range_Domain_Maximum: 652283.035226
Attribute:
Attribute_Label: y_n83_utm1
Attribute_Definition: Y coordinate of data point in meters
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 394261.51065
Range_Domain_Maximum: 4013942.20133
Attribute:
Attribute_Label: G882_raw
Attribute_Definition: Raw, unprocessed, magnetic level at data point
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 47708.402
Range_Domain_Maximum: 48954.458
Attribute:
Attribute_Label: G882_DIURN
Attribute_Definition: Magnetic level correction applied
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -1027.063853
Range_Domain_Maximum: 211.328272
Attribute:
Attribute_Label: G882_IGRF
Attribute_Definition:
Magnetic level with International Geomagnetic Reference Field (IGRF) correction applied
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 47692.127354
Range_Domain_Maximum: 47960.730315
Attribute:
Attribute_Label: FRN_base
Attribute_Definition:
Value of International Geomagnetic Reference Field at the Fresno Base at the time data point was collected
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 48701.683522
Range_Domain_Maximum: 48794.321516
Attribute:
Attribute_Label: total_fiel
Attribute_Definition: Calculated Total Field (Residual) Anomaly (see Process Step 6)
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 93.619574
Range_Domain_Maximum: 1287.446388
Attribute:
Attribute_Label: mag_final
Attribute_Definition:
Magnetic level Final-magnetic level with directional correction applied
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 78.725368
Range_Domain_Maximum: 1721.105944
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey - ScienceBase
Contact_Address:
Address_Type: mailing and physical address
Address: Denver Federal Center, Building 810, Mail Stop 302
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: 1-888-275-8747
Resource_Description:
Downloadable magnetic field data These data are available in shapefile format (PointSurToPiedrasBlancas_magnetics.shp and associated files) contained in a single zip file (PointSurToPiedrasBlancas_magnetics.zip), which also include CSDGM FGDC-compliant metadata.
Distribution_Liability:
Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: shapefile
File_Decompression_Technique: ZIP
Transfer_Size: 45
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Fees: None
Technical_Prerequisites: This shapefile can be viewed with Esri or other GIS software.
Metadata_Reference_Information:
Metadata_Date: 20201019
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Janet T. Watt
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Address:
Address_Type: mailing and physical address
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060-5792
Country: US
Contact_Voice_Telephone: 831-460-7565
Contact_Facsimile_Telephone: 831-427-4748
Contact_Electronic_Mail_Address: jwatt@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

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