Merged Multibeam Bathymetry Data and Shaded Relief geoTIFF Compiled from Government, Academic, and Private Sources for the Inner Continental Borderland, Southern California (s_ca_25mbathy and s_ca_25mshd)

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Frequently anticipated questions:


What does this data set describe?

Title:
Merged Multibeam Bathymetry Data and Shaded Relief geoTIFF Compiled from Government, Academic, and Private Sources for the Inner Continental Borderland, Southern California (s_ca_25mbathy and s_ca_25mshd)
Abstract:
In December 2013 Scripps Institution of Oceanography (SIO) collected multibeam bathymetry and acoustic backscatter data in the Gulf of Santa Catalina and the San Diego Trough, southern California (SIO survey ID MV-1316). The surveys were conducted using the SIO R/V Melville outfitted with a 120-kHz Knogsberg EM-122 multibeam echosounder. The U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC) processed these data and produced a series of bathymetric surfaces and acoustic backscatter images. The 25-m bathymetric surface produced from this work was merged with publicly available multibeam bathymetry of the Inner Continental Borderland. These data can be used to assess the hazards posed by offshore faults, submarine landslides, and tsunamis as well as map sediment transport pathways and sedimentary sinks. These metadata describe the merged bathymetry data provided in the report.
  1. How might this data set be cited?
    U.S. Geological Survey and Scripps Institution of Oceanography, 2014, Merged Multibeam Bathymetry Data and Shaded Relief geoTIFF Compiled from Government, Academic, and Private Sources for the Inner Continental Borderland, Southern California (s_ca_25mbathy and s_ca_25mshd):.

    Online Links:

    This is part of the following larger work.

    Dartnell, Peter, Driscoll, Neal W., Brothers, Daniel, Conrad, James E., Kluesner, Jared, Kent, Graham, and Andrews, Brian, 2014, Bathymetry, Acoustic Backscatter, and Selected Perspective Views - Inner Continental Borderland, Southern California: Scientific Investigations Map XXXX, U.S. Geological Survey, Coastal and Marine Geology Program, Pacific Coastal and Marine Science Center, Santa Cruz and Menlo Park, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -118.82
    East_Bounding_Coordinate: -117.03
    North_Bounding_Coordinate: 34.09
    South_Bounding_Coordinate: 32.53
  3. What does it look like?
    figures/S_CA_bathyQV.gif (GIF)
    Image showing coverage of merged southern California bathymetry.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 2013
    Ending_Date: 2014
    Currentness_Reference: publication date
  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, 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: 0.9996
      Longitude_of_Central_Meridian: -117.00000
      Latitude_of_Projection_Origin: 0.00000
      False_Easting: 500000.0
      False_Northing: 0.00
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 25.0
      Ordinates (y-coordinates) are specified to the nearest 25.0
      Planar coordinates are specified in Meters
      The horizontal datum used is NAD83.
      The ellipsoid used is GRS80.
      The semi-major axis of the ellipsoid used is 6378137.00 meters.
      The flattening of the ellipsoid used is 1/298.257.
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    The complete merged bathymetry surface was originally archived as an ESRI grid with the following attributes:
    Cell size = 25.0
    Number of rows = 6793
    Number of columns = 6449
    
    Data type = floating point
    
    Boundary
    Xmin = 326382
    Xmax = 487607
    Ymin = 3595859
    Ymax = 3765684
    
    Statistics
    Minimum value = -2118.51
    Maximum value = -0.23
    Mean = -716.82
    Standard deviation = 716.82
    
    Coordinate system description
    Projection  UTM
    Zone  11
    Datum  NAD83
    Vertical Datum  NAVD88
    Units  meter
    
    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?
    Peter Dartnell
    U.S. Geological Survey, Pacifc Coastal and Marine Science Center
    Physical Scientist
    400 Natural Bridge Dr.
    Santa Cruz, CA
    USA

    (831) 460-7415 (voice)
    (831) 427-4709 (FAX)
    pdartnell@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) or other software to identify bathymetric features. These data are not intended for navigational purposes.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 2014 (process 1 of 2)
    In December 2013, Scripps Institution of Oceanography (SIO) collected multibeam bathymetry and acoustic backscatter data in the Gulf of Santa Catalina and the San Diego Trough aboard the R/V Melville outfitted with a 120-kHz Kongsberg EM-122 multibeam echsounder (SIO survey ID MV-1316). The U.S. Geological Survey, Pacific Coastal and Marine Science Center received from SIO the raw (.all) survey line files. Survey line files were imported into Caris HIPS and SIPS software for processing. All surveying corrections including ship motion, water-column sound velocity, and tidal correction are assumed to be incorporated into the raw (.all) line files prior to import into the Caris software. A field sheet was created to encompass the entire survey area. Survey lines were filtered to remove obvious erroneous soundings and soundings towards the noisier outer beams and then gridded into the appropriate field sheet. A CARIS base surface was created for the entire survey area at 25-m resolution using the CUBE processing method. The base surface was then exported as an ASCII XYZ file (x-coordinate, y-coordinate, depth) in World Geodetic System of 1984 (WGS84, G1150) coordinates relative to Mean Lower Low Water. There is a 0.058-m vertical difference between the NAVD-88 datum (1.389 m) and the Mean Lower Low Water datum (1.331 m) at the La Jolla tide station (9410230). These data were gridded in Fledermaus (QPC) software (Version 7.1) at 25-m resolution and the resulting surface was converted to an ASCIIRaster format file and imported into a Geographic Information System (ESRI, ArcMap) and converted to a grid. The grid was projected horizontally to the North American Datum of 1983 (NAD83, CORS96) using the ESRI "WGS_1984_(ITRF00)_To_NAD_1983_CORS96" function in ArcTools. Person who carried out this activity:
    Pete Dartnell
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Physical Scientist
    400 Natural Bridges Dr.
    Santa Cruz, CA
    USA

    (831) 460-7415 (voice)
    pdartnell@usgs.gov
    Date: 2014 (process 2 of 2)
    Publicly available multibeam bathymetry data from various sources (see below) were merged with the 2013 SIO-USGS 25-m bathymetry data. All higher-resolution data were down-sampled to 25-m spatial resolution. All needed datasets were projected horizontally to the North American Datum of 1983 (NAD83, CORS96) using the ESRI "WGS_1984_(ITRF00)_To_NAD_1983_CORS96" function in ArcTools. All resulting 25-m bathymetry surfaces were merged together using the ESRI GRID workstation command "merge" with priority given to more recent surveys. Publicly available multibeam bathymetry data include, USGS Surveys: Los Angeles Margin (https://pubs.usgs.gov/of/2002/0162/intro.html), San Diego Margin (https://pubs.usgs.gov/of/2004/1221/), and Gulf of Santa Catalina (http://pubs.er.usgs.gov/publication/ofr20141094); California Seafloor Mapping Project and CSUMB: http://seafloor.otterlabs.org/csmp/csmp.html (Santa Catalina Island, H11879, H11880, H11881, La Jolla Canyon, San Elijo Lagoon, Santa Margarita River); National Geophysical Data Center: http://www.ngdc.noaa.gov/mgg/bathymetry/relief.html (CALF01RR, DRFT01RR, GLOR00MV, MCD0212, AT03149, WEST15MV, NPAL); SANDDAG / CDFG: ftp://ftp.dfg.ca.gov/R7_MR/BATHYMETRY/BAT_SCSR_SANDAG.zip Person who carried out this activity:
    Pete Dartnell
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Physical Scientist
    400 Natural Bridges Dr.
    Santa Cruz, CA
    USA

    (831) 460-7415 (voice)
    pdartnell@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?
  2. How accurate are the geographic locations?
    This merged bathymetry dataset includes publicly available multibeam bathymetry data available from the National Geophysical Data Center. It is unknown the Horizontal Positional Accuracy of older data sets used in this map.
  3. How accurate are the heights or depths?
    This merged bathymetry dataset includes publicly available multibeam bathymetry data available from the National Geophysical Data Center. It is unknown the Vertical Positional Accuracy of older data sets used in this map.
  4. Where are the gaps in the data? What is missing?
    Complete
  5. How consistent are the relationships among the observations, including topology?
    Unspecified

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. Acknowledge Scripps Institution of Oceanography and 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 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. 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
    345 Middlefield Rd
    Menlo Park, CA
    USA

    (650) 329-4309 (voice)
  2. What's the catalog number I need to order this data set?
  3. What legal disclaimers am I supposed to read?

    This database, identified as merged bathymetry of the Inner Continental Borderland, southern California has been approved for release and publication by the U.S. Geological Survey (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 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?

Who wrote the metadata?

Dates:
Last modified: 25-Sep-2014
Last Reviewed: 18-Sep-2014
Metadata author:
Peter Dartnell
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Physical Scientist
400 Natural Bridges Dr.
Santa Cruz, CA
USA

(831) 460-7415 (voice)
(831) 427-4709 (FAX)
pdartnell@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

Generated by mp version 2.9.30 on Wed Apr 8 17:00:30 2015