Metadata: 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 Oceanside, southern California during field activity 2017-686-FA from 2017-10-23 to 2017-10-31 Geospatial_Data_Presentation_Form: comma-delimited text Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9UELSBU 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/P9UELSBU Online_Linkage: https://cmgds.marine.usgs.gov/data-releases/datarelease/10.5066-P9UELSBU/ Larger_Work_Citation: Citation_Information: Originator: Ray W. Sliter Originator: James E. Conrad Originator: Thomas D. Lorenson Originator: Antoinette G. Papesh Originator: Janet T. Watt Originator: Jonathan A. Warrick Publication_Date: 2021 Title: Geophysical and sampling data collected offshore Oceanside, southern California during field activity 2017-686-FA from 2017-10-23 to 2017-10-31 Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9UELSBU 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/P9UELSBU Description: Abstract: This part of the data release contains marine magnetic data that were collected aboard the R/V Snavely in 2017 on U.S. Geological Survey cruise 2017-686-FA offshore Oceanside, southern California. The magnetic field data were collected to characterize the surface and subsurface properties of the study area, including unconsolidated sediment thickness and subsurface sediment horizons. Purpose: The U.S. Geological Survey (USGS) collected marine magnetic in 2017 offshore Oceanside, southern 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=2017-686-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: 20171017 Ending_Date: 20171031 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: -117.63597 East_Bounding_Coordinate: -117.42379 North_Bounding_Coordinate: 33.36704 South_Bounding_Coordinate: 33.18941 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:2b3aad9c-e1cd-4130-a841-4c2b8306f574 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: magnetic anomaly 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: Oceanside Place_Keyword: San Mateo Point 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 as the originator of the dataset and in products derived from these data. This information is not intended for navigation purposes. 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: 831-460-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: https://cmgds.marine.usgs.gov/data-releases/media/2020/10.5066-P9UELSBU/497e7ccd0d7549d4aaa5c2f7b021a3dc/2017-686-FA_mag_map.jpg Browse_Graphic_File_Description: Image map of magnetic anomalies overlaid on a greyscale shaded-relief bathymetry. Browse_Graphic_File_Type: JPEG 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: 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. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: not applicable for these data 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: 20171031 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 + 0.15hrs =-24,660sec **NOTE: 0.0666667hr/deg longitude correction -Import .survey files, despike -Export files as Geosoft .xyz 2)Import to Oasis 3)Calculated IGRF for G882 data = IGRF_G882 4)Back calculated Base Magnetometer measurements G882-DIURNAL_1 = FRN_base 5)Calculated IGRF value at base station FRN = 42130.4nT 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 To produce a georeferenced tiff file, data were gridded with ArcMap at 200m using minimum curvature. Colors are plotted using histogram equalize (not linear), to highlight subtle anomaly gradients. Projection is UTM z10N, wgs84. Process_Date: 20200218 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: 163487 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 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: 2017-686-FA_magnetics Entity_Type_Definition: Points representing magnetic field anomaly value in nanoteslas (nT) Entity_Type_Definition_Source: USGS Attribute: Attribute_Label: lat Attribute_Definition: Latitude of data point in decimal degrees Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 33.1894121 Range_Domain_Maximum: 33.3670425 Attribute: Attribute_Label: lon Attribute_Definition: Longitude of data point in decimal degrees Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -117.63597 Range_Domain_Maximum: -117.42379 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: 46390.75 Range_Domain_Maximum: 46517.38 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: -1732.35 Range_Domain_Maximum: -1609.68 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: 10/25/17 Range_Domain_Maximum: 10/30/17 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: 440789.7 Range_Domain_Maximum: 460504.89 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: 3672379.87 Range_Domain_Maximum: 3692140.28 Attribute: Attribute_Label: DGRF_G882 Attribute_Definition: back-calculated total magnetic field value at base station in nanoteslas (nT) Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 46148.48 Range_Domain_Maximum: 46227.65 Attribute: Attribute_Label: FRN_base Attribute_Definition: back-calculated total magnetic field value at base station in nanoteslas (nT) Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 48116.1 Range_Domain_Maximum: 48132.31 Attribute: Attribute_Label: IGRF_G882 Attribute_Definition: International Geomagnetic Reference Field (IGRF) valueat each G882 measurement in nanoteslas (nT) Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 48333.24 Range_Domain_Maximum: 48333.24 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: 432.63 Range_Domain_Maximum: 559.23 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, shapefile format (2017-686-FA_magnetics.shp and associated files), and an interpolated georeferenced TIFF file, contained in a single zip file (2017-686-FA_magnetics.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: shapefile, comma-delineated text, and TIFF Format_Information_Content: Downloadable magnetic field data. These data are available in comma separated format, shapefile format (2017-686-FA_magnetics.shp and associated files), and an interpolated georeferenced TIFF file, contained in a single zip file (2017-686-FA_magnetics.zip). File_Decompression_Technique: zip Transfer_Size: 13.1 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/media/2020/10.5066-P9UELSBU/dcf68d197e2447e6b221e984e86787e0/2017-686-FA_magnetics.zip Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/datarelease/10.5066-P9UELSBU/dataset/10/ Network_Resource_Name: https://doi.org/10.5066/P9UELSBU Access_Instructions: Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the zipped file of marine magnetic data. The second link points to a page with both the magnetic data and metadata. The third link points to a landing page for the entire data release, including other data types. Fees: None. Technical_Prerequisites: The shapefile can be viewed with Esri or other GIS software. The CSV file can be viewed with any spreadsheet viewing software. The TIFF file is viewable with any graphics software. Metadata_Reference_Information: Metadata_Date: 20210317 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: 831-460-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998