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: https://www.sciencebase.gov/catalog/file/get/593f01b7e4b0764e6c61bb92 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: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/593f01b7e4b0764e6c61bb92 Network_Resource_Name: https://doi.org/10.5066/F7FB51F7 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