Acoustic Backscatter geoTIFF from data collected in 2013 by Scripps Institution of Oceanography and processed by the U.S. Geological Survey for the Inner Continental Borderland, Southern California (mv1316_backscatter)

Metadata also available as - [Outline] - [Parseable text] - [XML]

Frequently anticipated questions:


What does this data set describe?

Title:
Acoustic Backscatter geoTIFF from data collected in 2013 by Scripps Institution of Oceanography and processed by the U.S. Geological Survey for the Inner Continental Borderland, Southern California (mv1316_backscatter)
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 Kongsberg 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. 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 acoustic backscatter imagery provided in the report.
  1. How might this data set be cited?
    U.S. Geological Survey and Scripps Institution of Oceanography, 2014, Acoustic Backscatter geoTIFF from data collected in 2013 by Scripps Institution of Oceanography and processed by the U.S. Geological Survey for the Inner Continental Borderland, Southern California (mv1316_backscatter):.

    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: -118.35
    East_Bounding_Coordinate: -117.30
    North_Bounding_Coordinate: 33.70
    South_Bounding_Coordinate: 32.60
  3. What does it look like?
    figures/MV1316_mosQV.gif (GIF)
    Image showing coverage of MV1316 acoustic-backscatter.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 2013
    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, 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 20.0
      Ordinates (y-coordinates) are specified to the nearest 20.0
      Planar coordinates are specified in Meters
      The horizontal datum used is WGS84.
      The ellipsoid used is WGS84.
      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 SIO-USGS acoustic backscatter image was originally archived as an ESRI grid with the following attributes:
    Cell size = 20.0
    Number of rows = 5709
    Number of columns = 4725
    
    Data type = floating point
    
    Boundary
    Xmin = 376037.18
    Xmax = 470537.18
    Ymin = 3607315.35
    Ymax = 3721495.35
    
    Statistics
    Minimum value = -63.71
    Maximum value = -4.64
    Mean = -28.35
    Standard deviation = 3.89
    
    Coordinate system description
    Projection  UTM
    Zone  11
    Datum  WGS84
    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 seafloor 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 1)
    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 abooard 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 Simrad (.all) survey line files. Backscatter data were processed using the Fledermaus (version 7.3.2) integration of Geocoder. The Simrad (.all) line files were imported into Fledermaus and adjustments were made to the files including TX/RX (transmit/receive) power gain and adaptive angle-varying gain corrections. The lines files were then mosaicked into one overall 20-m resolution image. The image was then exported as a georeferenced TIFF image. 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?
    Estimated to be no less than 25 m, owing to water depth and total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations.
  3. How accurate are the heights or depths?
  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 Acoustic Backscatter 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: 15-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 16:59:02 2015