Sediment Thickness--Point Conception to Hueneme Canyon, California

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Frequently anticipated questions:


What does this data set describe?

Title:
Sediment Thickness--Point Conception to Hueneme Canyon, California
Abstract:
This part of DS 781 presents data for the sediment-thickness map of the Point Conception to Hueneme Canyon, California, region. The raster data file is included in "SedimentThickness_PointConceptionToHuenemeCanyon.zip," which is accessible from https://doi.org/10.5066/F7891424.
As part of the USGS's California State Waters Mapping Project, a 50-m grid of sediment thickness for the seafloor within the 3-nautical mile limit between Point Conception and Hueneme Canyon was generated from seismic-reflection data collected in 2014 (USGS activity 2014-632-FA) supplemented with outcrop and geologic structure (fault) information following the methodology of Wong (2012). This sediment thickness layer was merged with a previously published sediment thickness grid for the Santa Barbara Channel region (available at https://pubs.usgs.gov/ds/781/SantaBarbaraChannel/data_catalog_SantaBarbaraChannel.html). Reference Cited: Wong, F. L., Phillips, E.L., Johnson, S.Y., and Sliter, R.W., 2012, Modeling of depth to base of Last Glacial Maximum and seafloor sediment thickness for the California State Waters Map Series, eastern Santa Barbara Channel, California: U.S. Geological Survey Open-File Report 2012-1161, 16 p. (available at https://pubs.usgs.gov/of/2012/1161/)
Supplemental_Information:
Additional information about the field activities from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/activity_info.php?fan=z307sc https://cmgds.marine.usgs.gov/activity_info.php?fan=s708sc https://cmgds.marine.usgs.gov/activity_info.php?fan=2014-632-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology.
  1. How might this data set be cited?
    Johnson, Samuel Y., and Hartwell, Stephen R., 2016, Sediment Thickness--Point Conception to Hueneme Canyon, California: Data Series DS 781, U.S. Geological Survey, Reston, VA.

    Online Links:

    This is part of the following larger work.

    Golden, Nadine E., 2013, California State Waters Map Series Data Catalog: Data Series DS 781, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -120.731
    East_Bounding_Coordinate: -119.100
    North_Bounding_Coordinate: 34.607
    South_Bounding_Coordinate: 34.050
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/589e0435e4b099f50d3a064e?name=SedimentThickness_PointConceptionToHuenemeCanyon.jpg&allowOpen=true (JPEG)
    Sediment Thickness for the region between Point Conception to Hueneme Canyon.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 2007
    Ending_Date: 2014
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: raster digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Raster data set. It contains the following raster data types:
      • Dimensions 1147 x 2969 x 1, type Grid Cell
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 10
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -117.0
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000.0
      False_Northing: 0.0
      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 50.0
      Ordinates (y-coordinates) are specified to the nearest 50.0
      Planar coordinates are specified in meters
      The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257224.
  7. How does the data set describe geographic features?
    Value
    Sediment thickness in meters (Source: ESRI)
    VALUE
    Thickness in meters of the sediment above transgressive surface (Source: ESRI)
    Range of values
    Minimum:0.0
    Maximum:31.95
    Units:meters
    Entity_and_Attribute_Overview:
    Grid value is thickness of sediment above the transgressive surface of the last glacial maximum in meters.
    Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Samuel Y. Johnson
    • Stephen R. Hartwell
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Attn: PCMSC Science Data Coordinator
    2885 Mission Street
    Santa Cruz, CA
    US

    831-427-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

These data are intended for science researchers, students, policy makers, and the general public. This information is not intended for navigational purposes. The data can be used with geographic information systems (GIS) software to display geologic and oceanographic information.

How was the data set created?

  1. From what previous works were the data drawn?
    SedimentThicknessSBC (source 1 of 6)
    Johnson, Samuel Y., Wong, Florence L., and Phillips, Eleyne L., 2012, Sediment thickness—Santa Barbara Channel, California.

    Online Links:

    Other_Citation_Details:
    See metadata for “SedimentThickness_SantaBarbaraChannel.zip” for source data and postprocessing/reprocessing information
    Type_of_Source_Media: sediment thickness raster digital data
    Source_Contribution: sediment thickness data to merge with new data
    2014-632-FA (source 2 of 6)
    Johnson, Samuel, Hartwell, Stephen, and Beeson, Jeff, 2016, Marine geophysical data - Point Sal to Refugio State Beach, southern California: data release doi:10.5066/F7SX6BCD, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

    Other_Citation_Details:
    See ”2014_632_FA_Corrected” metadata for source data and postprocessing/reprocessing information
    Type_of_Source_Media: minisparker seismic-reflection data in SEG-Y format
    Source_Contribution:
    digital seismic data used to interpret subsurface geologic structure
    PointConceptionFaults (source 3 of 6)
    Hartwell, Stephen R., Johnson, Samuel Y., and Davenport, Charles W., 2017, Faults-Offshore of Point Conception map area, California: U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

    Type_of_Source_Media: polyline shapefile
    Source_Contribution: faults were used to interpret subsurface geologic structure
    GaviotaFaults (source 4 of 6)
    Hartwell, Stephen R., Johnson, Samuel Y., and Davenport, Charles W., 2017, Faults-Offshore of Gaviota map area, California: U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

    Type_of_Source_Media: polyline shapefile
    Source_Contribution: faults were used to interpret subsurface geologic structure
    PointConceptionGeology (source 5 of 6)
    Hartwell, Stephen R., Johnson, Samuel Y., and Davenport, Charles W., 2017, Geology and geomorphology--Offshore of Point Conception Map Area, California: U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

    Type_of_Source_Media: polyline shapefile
    Source_Contribution: used to determine bedrock outcrops
    GaviotaGeology (source 6 of 6)
    Hartwell, Stephen R., Johnson, Samuel Y., and Davenport, Charles W., 2017, Geology and geomorphology--Offshore of Gaviota map area, California: U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

    Type_of_Source_Media: polyline shapefile
    Source_Contribution: used to determine bedrock outcrops
  2. How were the data generated, processed, and modified?
    Date: 2015 (process 1 of 5)
    Water bottom (seabed) and depth to base of the Last Glacial Maximum (LGM) horizons were digitized from seismic-reflection data using Seisworks software. The difference between the two horizons was exported from Seisworks for every shot point as XY coordinates (UTM Zone 10) and two-way travel time (TWT). The thickness was determined by applying a sound velocity to the TWT of 1,500 m/sec in water and 1,600 m/sec velocity in sediment, resulting in sediment thickness values. Data sources used in this process:
    • 2014-632-FA
    Date: 2015 (process 2 of 5)
    XY locations and sediment thickness values Z were imported to ArcGIS format as points and interpolated to a preliminary surface with TopoRaster from which isopachs (thickness contours) were extracted at 2.5 m intervals (see https://www.sciencebase.gov/catalog/item/589cba61e4b0efcedb76497e). Further refinement of this sediment thickness map and the isopach shapefile was accomplished through several iterations of manual editing to incorporate geology and fault information following the methodology of Wong (2012; see http://pubs.usgs.gov/of/2012/1161/). Data sources used in this process:
    • 2014-632-FA, PointConceptionFaults, GaviotaFaults, PointConceptionGeology, GaviotaGeology
    Data sources produced in this process:
    • SedimentThicknessNew
    Date: 2015 (process 3 of 5)
    Sediment thickness information from Point Conception to Gaviota was merged with sediment thickness information from the Santa Barbara Channel to create one continuous dataset Data sources used in this process:
    • SedimentThicknessNew, SedimentThicknessSBC
    Date: 06-Apr-2018 (process 4 of 5)
    Metadata was modified to add accompanying USGS Open-File Report to the Larger Works section. USGS Thesaurus and keywords were added, and Process Steps were refined. Minor typos were corrected. No data information was changed. Person who carried out this activity:
    Susan A Cochran
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Geologist
    2885 Mission Street
    Santa Cruz, CA
    USA

    (831) 460-7545 (voice)
    scochran@usgs.gov
    Date: 17-Sep-2018 (process 5 of 5)
    Point of Contact information was updated. USGS Thesaurus and keywords were added, Supplemental Info links updated, and details about different Network Resource Name links was given in the Access Instructions section. Phone number for Metadata Contact was corrected. No data information was changed. Person who carried out this activity:
    Susan A Cochran
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    2885 Mission St.
    Santa Cruz, CA
    United States

    831-460-7545 (voice)
    scochran@usgs.gov
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    Data points are approximately 1 m apart along tracklines and 1000-2000 m apart between tracks. 50-m cell size for interpolation is better supported along track than between.
  2. How accurate are the geographic locations?
    The chirp sonar instrument is deployed under the research vessel with about 10m of variation in position. The sparker position may vary as much as 20m from the navigation reference on the vessel.
  3. How accurate are the heights or depths?
    Estimated to be approximately 1 m, along the track lines where data is well constrained, but may be much greater in areas where interpolation occurred.
  4. Where are the gaps in the data? What is missing?
    Sediment thickness data points exported from Seisworks profiling software were processed within the California 3-nmi limit.
  5. How consistent are the relationships among the observations, including topology?
    All vector geometry and attributes present.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
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. This information is not intended for navigation purposes.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO
    USA

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? The .zip file (https://www.sciencebase.gov/catalog/file/get/589cba9fe4b0efcedb764ca2?.zip) includes the .lyr, .tfw, .tif, .tif_ColorRamp.SLD, .tif.aux.xml, .tif.ovr, .tif.vat.cpg, and .tif.vat.dbf files, as well as FGDC-compliant metadata for the Sediment Thickness data layer in the Point Conception to Hueneme Canyon region of California.
  3. What legal disclaimers am I supposed to read?
    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.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    The downloadable data file has been compressed with the "zip" command and can be unzipped with Winzip (or other tool) on Windows systems. To utilize these data, the user must have software capable of uncompressing the WinZip file and importing and viewing an Esri ArcMap TIFF. Users should download the ArcGIS Project File, PointConceptionToHuenemeCanyonGIS.mxd.zip, a compressed (with the "zip" command) version of the ArcMap document (.mxd) that has all the data layers loaded in the table of contents for "Point Conception to Hueneme Canyon" and has all the data symbolized as on the SIM map sheets. Download and save this ArcGIS project file, including all data layers, to the directory the user has created for this GIS.

Who wrote the metadata?

Dates:
Last modified: 17-Sep-2018
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA
US

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/cal_state_waters/SedimentThickness_PointConceptionToHuenemeCanyon_metadata.faq.html>
Generated by mp version 2.9.49 on Thu Sep 20 10:26:04 2018