Marine magnetic data collected offshore San Francisco, California, during field activity 2019-649-FA from 2019-10-11 to 2019-10-18

Metadata also available as - [Questions & Answers] - [Parseable text] - [XML]

Metadata:

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Entity_and_Attribute_Information
Distribution_Information
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Janet T. Watt
Originator: Ray W. Sliter
Originator: James E. Conrad
Originator: Thomas D. Lorenson
Originator: Antoinette G. Papesh
Originator: Jonathan A. Warrick
Publication_Date: 2021
Title:

Marine magnetic data collected offshore San Francisco, California, during field activity 2019-649-FA from 2019-10-11 to 2019-10-18

Geospatial_Data_Presentation_Form: comma-delimited text
Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/P9LBG9H5

Publication_Information:

Publication_Place:

Pacific Coastal and Marine Science Center, Santa Cruz, California

Publisher: U.S. Geological Survey

Online_Linkage: https://doi.org/10.5066/P9LBG9H5
Larger_Work_Citation:

Citation_Information:

Originator: Ray W. Sliter
Originator: James E. Conrad
Originator: Thomas D. Lorenson
Originator: Antoinette G. Papesh
Originator: Alicia F. Balster-Gee
Originator: Janet T. Watt
Originator: Jonathan A. Warrick
Publication_Date: 2021
Title:

Geophysical and core sample data collected offshore San Francisco, California, during field activity 2019-649-FA from 2019-10-11 to 2019-10-18

Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/P9LBG9H5

Publication_Information:

Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA
Publisher: U.S. Geological Survey

Online_Linkage: https://doi.org/10.5066/P9LBG9H5

Description:

Abstract:

This part of the data release contains marine magnetic data that were collected aboard the R/V Bold Horizon in 2019 on U.S. Geological Survey Field Activity 2019-649-FA offshore San Francisco, California.

Purpose:

The U.S. Geological Survey (USGS) collected marine magnetic in 2019 offshore San Francisco, California. The goal of the magnetic survey was to provide magnetic field data to characterize the surface and subsurface properties of the study area, including unconsolidated sediment thickness and subsurface sediment horizons. This cruise was funded through partnerships with the Bureau of Ocean Energy Management (BOEM) and the State of California Ocean Protection Council (OPC).

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=2019-649-FA
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: 20191011
Ending_Date: 20191018

Currentness_Reference: ground condition at time data were collected

Status:

Progress: Planned
Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -122.87083
East_Bounding_Coordinate: -122.39324
North_Bounding_Coordinate: 38.01347
South_Bounding_Coordinate: 37.49665

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:ddb08b78-74bf-48c2-9328-b6412031aa88

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: oceans
Theme_Keyword: geoscientificInformation

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: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: continental margin
Theme_Keyword: magnetic field observations

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword:

Theme_Keyword U.S. Geological Survey Theme_Keyword USGS Theme_Keyword Coastal and Marine Hazards and Resources Program Theme_Keyword CMHRP 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: San Francisco
Place_Keyword: Bolinas
Place_Keyword: Ocean Beach

Place:

Place_Keyword_Thesaurus: NGA GEOnet Names Server (GNS)
Place_Keyword: North Pacific Ocean

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 (USGS, the Bureau of Ocean Energy Management (BOEM), and the California Geological Survey (CGS) as the originator(s) of the dataset and in products derived from these data.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

U.S. Geological Survey, Pacific Coastal and Marine Science Center

Contact_Person: PCMSC Science Data Coordinator

Contact_Address:

Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060

Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov

Browse_Graphic:

Browse_Graphic_File_Name: 2019-649-FA_magnetics_map.png
Browse_Graphic_File_Description: Map showing magnetic anomaly data.
Browse_Graphic_File_Type: PNG

Native_Data_Set_Environment: comma separated file

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:

Position data were provided by a Hemisphere V100 Global Positioning System using L1, C/A code and carrier phase smoothing with a stated accuracy of 60 centimeters.

Lineage:

Process_Step:

Process_Description:

Magnetic field data were collected using a Geometrics G882 cesium-vapor marine magnetometer. Survey speeds were approximately 4.5 knots.

Process_Date: 20191018

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. Data were only lightly edited and may require additional noise-editing and/or heading corrections to make fully interpretable. -Apply time-offset to DIURNAL (base) readings for GMT to local PDT + longitude difference from base to survey = -7hrs + 0.15hrs =-24,660sec **NOTE: 0.0666667hr/deg longitude correction -Import .survey files, despike -Export files as Geosoft .xyz
2)Import to Oasis-Montaj
3)Calculated DGRF for G882 data and FRN base station = DGRF_G882 and DGRF_FRN. IGRF 13 Generation model was calculated per Alken and others (2021), https://doi.org/10.1186/s40623-020-01288-x. *NOTE: for survey dates 10/11/19 and 10/12/19, DGRF calculated in Oasis montaj (OM) was incorrect. DGRF values for these two days were corrected by applying a DC shift to the OM values based on DGRF value calculated using the following online calculator (http://geomag.bgs.ac.uk/data_service/models_compass/igrf_calc.html).
4)Back calculated FRN Base Magnetometer measurements because they are NOT exported from MagMap2000 G882-DIURNAL_1 = FRN_base
5)Calculated DGRF value at base station FRN = 48138nT
6)Calculated Total Field (Residual) Anomaly (Resid_anom) 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
Projection is UTM z10N, wgs84.

Process_Date: 20210601

Process_Step:

Process_Description:

Performed minor edits to the metadata to correct typos. No data were changed

Process_Date: 20211013
Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey
Contact_Person: Susan A. Cochran

Contact_Position: Geologist
Contact_Address:

Address_Type: Mailing and Physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060

Contact_Voice_Telephone: 831-460-7545
Contact_Electronic_Mail_Address: scochran@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: 366908

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: WGS 1984 UTM Zone 11N
Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -117.0
Latitude_of_Projection_Origin: 0.0
False_Easting: 500000.0
False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:

Abscissa_Resolution: 0.0001
Ordinate_Resolution: 0.0001

Planar_Distance_Units: Meter

Geodetic_Model:

Horizontal_Datum_Name: D WGS 1984
Ellipsoid_Name: WGS 1984
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257223563

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: 2019-649-FA_magnetics
Entity_Type_Definition:

Points representing magnetic field anomaly value in nanoteslas (nT)

Entity_Type_Definition_Source: USGS

Attribute:

Attribute_Label: lon_dec_deg
Attribute_Definition: Longitude of data point in decimal degrees
Attribute_Definition_Source: USGS
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -122.709864
Range_Domain_Maximum: -122.517473

Attribute:

Attribute_Label: lat_dec_deg
Attribute_Definition: Latitude of data point in decimal degrees
Attribute_Definition_Source: USGS
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 37.566820
Range_Domain_Maximum: 37.893757

Attribute:

Attribute_Label: G882_raw
Attribute_Definition:

Raw, unprocessed, total magnetic field value at G882 in nanoteslas (nT)

Attribute_Definition_Source: USGS
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 47411.66
Range_Domain_Maximum: 48291.94

Attribute:

Attribute_Label: DIURNAL
Attribute_Definition:

Diurnal field correction at each G882 measurement in nanoteslas (nT)

Attribute_Definition_Source: USGS
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -512.35
Range_Domain_Maximum: 369.45

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: 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: 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: 10/11/19
Range_Domain_Maximum: 10/18/19

Attribute:

Attribute_Label: utm_x
Attribute_Definition: X coordinate of data point in meters
Attribute_Definition_Source: USGS
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 525548.83
Range_Domain_Maximum: 542581.75

Attribute:

Attribute_Label: utm_y
Attribute_Definition: Y coordinate of data point in meters
Attribute_Definition_Source: USGS
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 4157812.93
Range_Domain_Maximum: 4194084.46

Attribute:

Attribute_Label: DGRF_G882
Attribute_Definition:

Definitive Geomagnetic Reference Field (DGRF) value at each G882 measurement in nanoteslas (nT)

Attribute_Definition_Source: USGS
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 47798.58
Range_Domain_Maximum: 48075.47

Attribute:

Attribute_Label: FRN_base
Attribute_Definition:

back-calculated total magnetic field value at base station in nanoteslas (nT) because they are NOT exported from MagMap2000

Attribute_Definition_Source: USGS
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 47908.55
Range_Domain_Maximum: 47937.75

Attribute:

Attribute_Label: DGRF_FRN
Attribute_Definition:

Definitive Geomagnetic Reference Field (DGRF) value at the base station in nanoteslas (nT)

Attribute_Definition_Source: USGS
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 48138
Range_Domain_Maximum: 48138

Attribute:

Attribute_Label: Resid_anom
Attribute_Definition:

Calculated Total Field (Residual) Anomaly (see Process Step 6) in nanoteslas (nT)

Attribute_Definition_Source: USGS
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -282.14
Range_Domain_Maximum: 597.78

Overview_Description:

Entity_and_Attribute_Overview: The first line of the csv file is a header line.
Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

U.S. Geological Survey Pacific Coastal and Marine Science Center

Contact_Address:

Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060

Contact_Voice_Telephone: 1-831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov

Resource_Description:

Downloadable magnetic field data. These data are available in comma separated format (2019-649-FA_magnetics.csv) and shapefile format (2019-649-FA_magnetics_shape.zip)

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: comma-delimited text
Format_Version_Date: 20210609
Format_Information_Content: 2019-649-FA_magnetics.csv is tabular magnetics data
Transfer_Size: 39.2

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: https://doi.org/10.5066/P9LBG9H5

Access_Instructions:

Data can be downloaded using the Network_Resource_Name link, then scroll down to the Magnetic Data section.

Digital_Form:

Digital_Transfer_Information:

Format_Name: shapefile
Format_Version_Date: 20210607
Format_Information_Content:

2019-649-FA_magnetics_shape.zip is a shapefile of magnetic residual anomalies

File_Decompression_Technique:

Winzip, 7-zip, or Winrar are free software that will open .zip files

Transfer_Size: 14.1

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: https://doi.org/10.5066/P9LBG9H5

Access_Instructions:

Data can be downloaded using the Network_Resource_Name link, then scroll down to the Magnetic Data section.

Fees: None.

Technical_Prerequisites: These data can be viewed with Microsoft Excel software.

Metadata_Reference_Information:

Metadata_Date: 20211013
Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

U.S. Geological Survey, Pacific Coastal and Marine Science Center

Contact_Person: PCMSC Science Data Coordinator

Contact_Address:

Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060

Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov

Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/CMGDS_DR_tool/DR_P9LBG9H5/2019-649-FA_magnetics_metadata.html>