Depth to transition--Santa Barbara Channel, California

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What does this data set describe?

Title: Depth to transition--Santa Barbara Channel, California
Abstract:
This part of DS 781 presents data for the depth-to-transition map of the Santa Barbara Channel, California, region. The raster data file is included in "DepthToTransition_SantaBarbaraChannel.zip," which is accessible from <https://pubs.usgs.gov/ds/781/SantaBarbaraChannel/data_catalog_SantaBarbaraChannel.html>. This depth-to-transition map of the Santa Barbara Channel is published in Scientific Investigations Map 3225, "California State Waters Map Series--Hueneme Canyon and Vicinity, California" (see sheet 9). In addition, this depth-to-transition map 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 depth to the transgressive surface of the Last Glacial Maximum was generated for the areas 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 multibeam bathymetric data (for example, sheet 1, SIM 3225) and 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 depth to the transgressive surface of the Last Glacial Maximum ranges between 12 and 190 meters.
Supplemental_Information:
Depth to transgressive surface of Last Glacial Maximum in individual map blocks: 
 62 (Offshore of Refugio Beach)       -120.19308, 34.37821, -119.99299, 34.54394
 63 (Offshore of Coal Oil Point)      -120.00703, 34.33620, -119.80704, 34.50193
 64 (Offshore of Santa Barbara)       -119.81596, 34.32279, -119.61634, 34.48824
 65 (Offshore of Carpinteria)         -119.62566, 34.28801, -119.42646, 34.45318
 66 (Offshore of Ventura)             -119.44808, 34.21495, -119.24937, 34.37985
 67 (Hueneme Canyon and vicinity)     -119.33785, 34.05822, -119.13973, 34.22296
 map       area   depth to transgressive surface
 block   (sq km)    MIN      MAX    MEAN    STD
   62        97   -101.8  -22.6    -61.9  16.5
   63       100   -190.0  -14.7    -67.4  29.0
   64        99    -78.8  -12.5    -48.8  17.4
   65        97    -83.9  -12.2    -40.6  15.0
   66       105    -87.9  -12.0    -55.2  17.3
   67       110   -169.5  -42.5    -61.4  14.7
Additional information about the field activities from which this data set was derived are available online at 
 <http://walrus.wr.usgs.gov/infobank/z/z307sc/html/z-3-07-sc.meta.html>
 <http://walrus.wr.usgs.gov/infobank/s/s708sc/html/s-7-08-sc.meta.html>
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, Depth to transition--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: GeoTiff

  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 980 x 1971 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: 11
      Transverse_Mercator:
      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?

    Entity_and_Attribute_Overview:
    Grid value is thickness of sediment in meters. 
    
SEDTHICK.STA:

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  MIN                    8    15     F      3
    9  MAX                    8    15     F      3
   17  MEAN                   8    15     F      3
   25  STDV                   8    15     F      3

    MIN             MAX            MEAN            STDV
    0.000          56.609          15.459          16.156
    Entity_and_Attribute_Detail_Citation: none

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
    Geologist
    345 Middlefield Road, MS 999
    Menlo Park, CA 94025
    USA

    650-329-5327 (voice)
    fwong@usgs.gov

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 3)
    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 3)
    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

    Kvitek and others (2012) [sheet 1 in SIM 3225] (source 3 of 3)
    Rikk G. Kvitek, Eleyne L. Phillips, and Peter Dartnell, 2012, Colored shaded-relief bathymetry, Hueneme Canyon and vicinity, California: Scientific Investigations Map SIM 3225 [sheet 1 of 12], U.S. Geological Survey, Reston, VA.

    Online Links:

    Type_of_Source_Media: disc
    Source_Contribution: gridded multibeam bathymetry

  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, rsliter@usgs.gov)

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

    Date: 2011 (process 3 of 5)
    Seabed and depth to Last Glacial Maximum horizons digitized in Seisworks (S.Y. Johnson, sjohnson@usgs.gov)

    Date: 2011 (process 4 of 5)
    Data exported and converted with 1,500 m/sec velocity in water and 1,600 m/sec velocity in sediment. (Ray Sliter, rsliter@usgs.gov).

    Date: 2011 (process 5 of 5)
    X, Y locations and sediment thickness value Z imported to ArcGIS format as points, interpolated to preliminary surface with TopoRaster. Because processing of the related sediment-thickness map resulted in an interpolated surface that diverged from the data exported from Seisworks, the final transgressive surface was calculated by subtracting sediment thickness from multibeam bathymetry. (Florence Wong, fwong@usgs.gov; Eleyne Phillips, ephillips@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 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?

    Not applicable for raster data.

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:
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
    USA

    (650) 329-5327 (voice)
    (650) 329-5190 (FAX)
    fwong@usgs.gov

  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?

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

650-329-5327 (voice)
fwong@usgs.gov

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 10:05:33 2013