Sediment Thickness--Pigeon Point to South Monterey Bay, California

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Frequently anticipated questions:


What does this data set describe?

Title:
Sediment Thickness--Pigeon Point to South Monterey Bay, California
Abstract:
This part of DS 781 presents data for the sediment-thickness map of the Pigeon Point to South Monterey Bay, California, region. The raster data file is included in "SedimentThickness_PigeonPointToSouthMontereyBay.zip," which is accessible from http://dx.doi.org/10.5066/F7N29V0Z As part of the USGS's California State Waters Mapping Project, a 50-m grid of sediment thickness for the seafloor within the limit of California’s State Waters between Pigeon Point and Southern Monterey Bay was generated from seismic-reflection data collected in 2009 and 2010 (USGS activities (S-15-10-NC and S-N1-09-MB) supplemented with outcrop and geologic structure from DS 781. The resulting grid covers an area of approximately 850 sq km. The volume of sediment accumulated since the Last Glacial Maximum is approximately 7,700 million cubic meters. Contours at 2.5-meter intervals were derived from this grid.
Supplemental_Information:
Sediment thickness and volume within each of the demains Area Volume (sq km) Mean (million cu m) Entire Pigeon Point to southern Monterey Bay region 849 6.7 5,708 (1) Southern Monterey Bay 253 6.2 1,555 (2) Northern Monterey Bay 307 6.7 2,065 (3) Davenport shelf 134 8.3 1,113 (4) Waddell Creek delta 29 7.8 224 (5) Año Nuevo shelf 58 2.6 154 (6) Pigeon Point shelf 68 8.8 598 Additional information about the field activities from which this data set was derived are available online at
 http://walrus.wr.usgs.gov/infobank/s/s1510nc/html/s-15-10-nc.meta.html
 http://walrus.wr.usgs.gov/infobank/s/sn109mb/html/s-n1-09-mb.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 might this data set be cited?
    Johnson, Samuel Y., Hartwell, Stephen R., Watt, Janet T., Sliter, Ray W., and Maier, Katie L., 2015, Sediment Thickness--Pigeon Point to South Monterey Bay, California:.

    This is part of the following larger work.

    Cochrane, Guy R., Watt, Janet T., Dartnell, Peter, Greene, H. Gary, Golden, Nadine E., Endris, Charles A., Dieter, Bryan E., Phillips, Eleyne L., Hartwell, Stephen R., Johnson, Samuel Y., Kvitek, Rikk G., Erdey, Mercedes D., Maier, Katie L., Davenport, Clifton W., Sliter, Ray W., Finlayson, David P., and Ritchie, Andrew C., 2015, California State Waters Map Series--Offshore of Pigeon Point Map Area, California: U.S. Geological Survey data set F7RV0KRZ, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -122.482894
    East_Bounding_Coordinate: -121.806918
    North_Bounding_Coordinate: 37.234833
    South_Bounding_Coordinate: 36.588129
  3. What does it look like?
    <https://www.sciencebase.gov/catalog/file/get/554aaaa0e4b082ec541270c1?f=__disk__7c%2Fa2%2F73%2F7ca273366cc63c7ddb516ff052da1b06f46749b7&width=150&height=150> (JPEG)
    Contours derived from bathymetry of offshore Pigeon Point.
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2015
    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 1215 x 1442 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:31.94
    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: none

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
    • Janet T. Watt
    • Ray W. Sliter
    • Katie L. Maier
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U.S. Geological Survey, Coastal and Marine Geology Program
    Attn: Stephen Hartwell
    Geologist
    400 Natural Bridges Drive
    Santa Cruz, CA
    USA

    (831) 460-7814 (voice)
    (831) 427-4748 (FAX)
    shartwell@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?
    S-15-10-NC (source 1 of 2)
    U.S. Geological Survey (USGS) , Coastal and Marine Geology Program (CMGP), 2014, Seismic-reflection data acquisition data of field activity S-15-10-NC in offshore Pescadero from 08/02/2010 to 08/04/2010: U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG), Menlo Park, CA.

    Online Links:

    Type_of_Source_Media: ASCII lat/long shot point files
    Source_Contribution:
    Digital seismic data used to interpret subsurface geologic structure
    S-N1-09-MB (source 2 of 2)
    U.S. Geological Survey (USGS) , Coastal and Marine Geology Program (CMGP), 2014, Mini-sparker seismic reflection data of field activity S-N1-09-MB in Santa Cruz to Ano Nuevo from 11/09/2009 to 12/19/2009: U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG), Menlo Park, CA.

    Online Links:

    Type_of_Source_Media: ASCII lat/long shot point files
    Source_Contribution:
    Digital seismic data used to interpret subsurface geologic structure
  2. How were the data generated, processed, and modified?
    Date: 2014 (process 1 of 9)
    Chirp and sparker seismic-reflection data from USGS field activity S-15-10-NC were imported to SEISWORKS.
    Date: 2014 (process 2 of 9)
    Seabed and depth to Last Glacial Maximum horizons digitized in Seisworks.
    Date: 2014 (process 3 of 9)
    Data exported and converted with 1500m/sec velocity in water and 1600 m/sec velocity in sediment.
    Date: 2014 (process 4 of 9)
    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.
    Date: 2014 (process 5 of 9)
    Chirp and sparker seismic-reflection data from USGS field activity S-N1-09-MB were imported to SEISWORKS.
    Date: 2014 (process 6 of 9)
    Seabed and depth to Last Glacial Maximum horizons digitized in Seisworks.
    Date: 2014 (process 7 of 9)
    Data exported and converted with 1500m/sec velocity in water and 1600 m/sec velocity in sediment.
    Date: 2014 (process 8 of 9)
    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.
    Date: 22-Jun-2018 (process 9 of 9)
    Corrected author spelling in Larger Work section 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
  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 limit of California’s State Waters.
  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:
If physical samples or materials are available, constraints on their on-site access are described in "WR CMG Sample Distribution Policy" at URL: http://walrus.wr.usgs.gov/infobank/programs/html/main/sample-dist-policy.html
Use_Constraints:
This information is not intended for navigational purposes. Read and fully comprehend the metadata prior to data use. Uses of these data should not violate the spatial resolution of the data. Where these data are used in combination with other data of different resolution, the resolution of the combined output will be limited by the lowest resolution of all the data. Acknowledge the U.S. Geological Survey in products derived from these data. Share data products developed using these data with the U.S. Geological Survey. This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Although this Federal Geographic Data Committee-compliant metadata file is intended to document these data in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey, Coastal and Marine Geology Program
    Attn: Stephen Hartwell
    Geologist
    400 Natural Bridges Drive
    Santa Cruz, CA
    USA

    (831) 460-7814 (voice)
    (831) 427-4748 (FAX)
    shartwell@usgs.gov
  2. What's the catalog number I need to order this data set?
  3. What legal disclaimers am I supposed to read?
    These databases, identified as sediment thickness for the Pigeon Point to South Monterey Bay Region, California have been approved for release and publication by the U.S. Geological Survey (USGS). Although these databases have been subjected to rigorous review and are substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at 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. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. These data are not intended for navigational use.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: The .zip file for a shapefile includes the .aux, .dbf, .shp, .shx, .sbx, and .sbn files, as well as the text (.txt) and XML (.shp.xml) versions of the metadata for the Contours data layer of Offshore Pigeon Point, California. in format SHP (version ArcMap (version 10.0, ESRI , 2011)) Point, line, and polygon features are in shapefile format and are projected in UTM Zone 10 coordinates, with datum WGS84. Size: 0.2
      Network links: https://www.sciencebase.gov/catalog/file/get/5549552be4b064e4207ca07a
      https://www.sciencebase.gov/catalog/
    • Cost to order the data: none

  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, OffshorePigeonPointGIS.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 "Offshore Pigeon Point" 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: 22-Jun-2018
Metadata author:
U.S. Geological Survey, Coastal and Marine Geology Program
Attn: Stephen Hartwell
Geologist
400 Natural Bridges Drive
Santa Cruz, CA
USA

(831) 460-7814 (voice)
(831) 427-4748 (FAX)
shartwell@usgs.gov
Metadata standard:
Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/cal_state_waters/SedimentThickness_PigeonPointToSouthMontereyBay_metadata.faq.html>
Generated by mp version 2.9.49 on Mon Sep 10 17:43:42 2018