Isopachs--Santa Barbara Channel, California

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What does this data set describe?

Title: Isopachs--Santa Barbara Channel, California
This part of DS 781 presents data for the isopachs for the Santa Barbara Channel, California, region. The vector data file is included in "," which is accessible from <>. These isopachs for the Santa Barbara Channel are published in Scientific Investigations Map 3225, "California State Waters Map Series--Hueneme Canyon and Vicinity, California" (see sheet 9). In addition, these isopachs will be published in five future California State Waters Map Series SIMs of the region (namely, the Offshore of Ventura, Offshore of Carpinteria, Offshore of Santa Barbara, Offshore of Coal Oil Point, and Offshore of Refugio Beach map areas) [note that, at the time of this writing, two of the other five SIMs have been published: the Offshore of Ventura map area (SIM 3254), and the Offshore of Carpinteria map area (SIM 3261)].
As part of the USGS's California Seafloor Mapping Program, a 50-m grid of sediment thickness for the seafloor within the 3-nautical-mile limit of California's State Waters from the Offshore of Refugio Beach map area to the Hueneme Canyon and vicinity map area. Source data include seismic-reflection profile data, collected in 2007 (USGS cruise Z-3-07-SC) and 2008 (USGS cruise S-7-08-SC), supplemented with outcrop and geologic structure data (for example, sheets 8, 10, SIM 3225). The resulting grid covers an area of approximately 600 sq km. The volume of sediment accumulated since the Last Glacial Maximum is approximately 9,000 million cubic meters. Contours at 2.5-meter intervals were derived from this grid.
Sediment thickness and volume within each of the map areas
 Offshore of Refugio Beach        -120.19308, 34.37821, -119.99299, 34.54394
 Offshore of Coal Oil Point       -120.00703, 34.33620, -119.80704, 34.50193
 Offshore of Santa Barbara        -119.81596, 34.32279, -119.61634, 34.48824
 Offshore of Carpinteria          -119.62566, 34.28801, -119.42646, 34.45318
 Offshore of Ventura              -119.44808, 34.21495, -119.24937, 34.37985
 Hueneme Canyon and vicinity      -119.33785, 34.05822, -119.13973, 34.22296
  map                           ---sediment thickness---  area (million
  block                         MIN    MAX   MEAN    STD (sq km)  cu m)
  Offshore of Refugio Beach     0.0   12.3    2.7    2.8    97     258
  Offshore of Coal Oil Point    0.0   16.6    4.0    4.1   100     402
  Offshore of Santa Barbara     0.0   15.5    3.1    3.2    99     308
  Offshore of Carpinteria       0.0   45.0   10.9    9.5    97    1060
  Offshore of Ventura           0.0   56.6   34.1   12.9   105    3584
  Hueneme Canyon and vicinity  19.0   48.6   36.0    5.2    95    3421
                                                    Total  594    9034
Additional information about the field activities from which this data set was derived are available online at
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 ArcInfo format, this metadata file may include some ArcInfo-specific terminology.
  1. How should this data set be cited?

    Johnson, Samuel Y. , Wong, Florence L. , and Phillips, Eleyne L. , 2012, Isopachs--Santa Barbara Channel, California:.

    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: -120.206232
    East_Bounding_Coordinate: -119.123028
    North_Bounding_Coordinate: 34.492447
    South_Bounding_Coordinate: 34.027787

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 2007
    Ending_Date: 2009
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • String (352)

    2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      UTM_Zone_Number: 11
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -117.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000

      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 50.000000
      Ordinates (y-coordinates) are specified to the nearest 50.000000
      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 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.

  7. How does the data set describe geographic features?

    lines of equal thickness (Source: standard sedimentology)

    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    sequential feature number (Source: this study)

    sequential feature numbers

    line of equal thickness (Source: this study)

    thickness measure

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    U.S. Geological Survey
    c/o Florence L. Wong
    345 Middlefield Road, MS 999
    Menlo Park, CA 94025

    650-329-5327 (voice)

Why was the data set created?

These data are intended for science researchers, students, policy makers, and the general public. 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?

    Johnson and others (2012) [sheet 10 in SIM 3225] (source 1 of 2)
    Samuel Y. Johnson, Ray W. Sliter, William R. Normark, , 2012, Seismic-reflection profiles, Hueneme Canyon and vicinity, California: Scientific Investigations Map SIM 3225 [sheet 8 of 12], U.S. Geological Survey, Reston, VA.

    Online Links:

    Type_of_Source_Media: disc
    Source_Contribution: bedrock distribution, faults

    Ritchie and others (2012) [sheet 10 in SIM 3225] (source 2 of 2)
    Andrew C. Ritchie, Samuel Y. Johnson, and Kevin B. Clahan, 2012, Offshore and onshore geology and geomorphology, Hueneme Canyon and vicinity, California: Scientific Investigations Map SIM 3225 [sheet 10 of 12], U.S. Geological Survey, Reston, VA.

    Online Links:

    Type_of_Source_Media: disc
    Source_Contribution: bedrock distribution, faults

  2. How were the data generated, processed, and modified?

    Date: 2011 (process 1 of 5)
    Chirp and sparker seismic-reflection data from USGS field activity Z-3-07-SC and chirp data from field activity S-7-08-SC were imported to SEISWORKS. (Ray Sliter,

    Date: 2011 (process 2 of 5)
    Seabed and depth to Last Glacial Maximum horizons digitized in Seisworks (S.Y. Johnson,

    Date: 2011 (process 3 of 5)
    Data exported and converted with 1,500 m/sec velocity in water and 1,600 m/sec velocity in sediment. (Ray Sliter,

    Date: 2011 (process 4 of 5)
    X, Y locations and sediment thickness value Z imported to ArcGIS format as points, interpolated to preliminary surface with TopoRaster. Supplemental manually generated contours were combined for secondary calculation. Final surface treated as grids separated by the Oak Ridge Fault then recombined. (Florence Wong,; Eleyne Phillips,

    Date: 2011 (process 5 of 5)
    Sediment thickness grid contoured at 2.5-meter intervals. (Eleyne Phillips,

  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 1,000-2,000 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 10 m of variation in position. The sparker position may vary as much as 20 m from the navigation reference on the vessel.

  3. How accurate are the heights or depths?

  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, omitting values over Hueneme Canyon.

  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.
Not to be used at scales greater than 1:24,000. Not to be used for navigation.

  1. Who distributes the data set? (Distributor 1 of 1)

    United States Geological Survey (USGS) Coastal and Marine Geology (CMG)
    c/o Florence L. Wong
    Geologist, GIS Coordinator
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561

    (650) 329-5327 (voice)
    (650) 329-5190 (FAX)

  2. What's the catalog number I need to order this data set?

    Downloadable Data. USGS DS 781

  3. What legal disclaimers am I supposed to read?

    Please recognize the U.S. Geological Survey (USGS) as the source of this information.
    Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data.
    The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials.

  4. How can I download or order the data?

Who wrote the metadata?

Last modified: 12-May-2011
Last Reviewed: May-2011
Metadata author:
U.S. Geological Survey
c/o Florence L. Wong
345 Middlefield Road, MS 999
Menlo Park, California 94025

650-329-5327 (voice)

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.9.6 on Wed Jul 10 10:06:01 2013