Repeat high-resolution acoustic-backscatter datasets collected between 2014 and 2016 of a field of crescent-shaped rippled scour depressions in northern Monterey Bay, California

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Frequently anticipated questions:


What does this data set describe?

Title:
Repeat high-resolution acoustic-backscatter datasets collected between 2014 and 2016 of a field of crescent-shaped rippled scour depressions in northern Monterey Bay, California
Abstract:
Between November 2014 and June 2016 the U.S. Geological Survey, Pacific Coastal and Marine Science Center (PCMSC) conducted eight repeat, high-resolution bathymetry and acoustic-backscatter surveys of a small patch of seafloor offshore Santa Cruz in northern Monterey Bay, California. PCMSC also collected oceanographic time-series data over the same two-year period. This metadata file describes the eight acoustic-backscatter datasets.
Supplemental_Information:
Additional information about the field activities from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2014-673-FA https://cmgds.marine.usgs.gov/fan_info.php?fan=2014-681-FA https://cmgds.marine.usgs.gov/fan_info.php?fan=2015-604-FA https://cmgds.marine.usgs.gov/fan_info.php?fan=2015-613-FA https://cmgds.marine.usgs.gov/fan_info.php?fan=2015-627-FA https://cmgds.marine.usgs.gov/fan_info.php?fan=2015-673-FA https://cmgds.marine.usgs.gov/fan_info.php?fan=2016-621-FA https://cmgds.marine.usgs.gov/fan_info.php?fan=2016-647-FA 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 Esri format, this metadata file may include some Esri-specific terminology.
  1. How might this data set be cited?
    Dartnell, Peter, Rosenberger, Kurt J., and Storlazzi, Curt D., 2018, Repeat high-resolution acoustic-backscatter datasets collected between 2014 and 2016 of a field of crescent-shaped rippled scour depressions in northern Monterey Bay, California: data release DOI:10.5066/F71C1W36, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Dartnell, Peter, Rosenberger, Kurt J., and Storlazzi, Curt D., 2018, Bathymetry, acoustic-backscatter, and time-series datasets collected between 2014 and 2016 of a field of crescent-shaped rippled scour depressions in northern Monterey Bay, California: data release DOI:10.5066/F71C1W36, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -122.031
    East_Bounding_Coordinate: -121.997
    North_Bounding_Coordinate: 36.954
    South_Bounding_Coordinate: 36.927
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/5a53bc65e4b01e7be22fc6fbhttps://www.sciencebase.gov/catalog/item/editForm/5a53bc65e4b01e7be22fc6fb?name=SantaCruz_RSD_backscatter_QV.jpg&allowOpen=true (JPEG)
    quick view image of June 2016 acoustic-backscatter data
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 2014
    Ending_Date: 2016
    Currentness_Reference:
    ground condition at time data were collected.
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: TIFF
  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 2921 x 3251 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: 0.9996
      Longitude_of_Central_Meridian: -123.00000
      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 1.0
      Ordinates (y-coordinates) are specified to the nearest 1.0
      Planar coordinates are specified in Meters
      The horizontal datum used is NAD83.
      The ellipsoid used is 2017.
      The semi-major axis of the ellipsoid used is 6378137.00.
      The flattening of the ellipsoid used is 1/298.257223563.
  7. How does the data set describe geographic features?
    value
    backscatter intensity (Source: Producer defined)
    Entity_and_Attribute_Overview:
    The complete 1-m resolution November 2014 acoustic-backscatter image (backscatter_november_2014_1m_utm10_nad83.tif) was originally archived as a TIFF image with the following attributes.
    Cell size = 1.0
    Number of rows = 2921
    Number of columns = 3251
    
    Data type = floating point
    
    Boundary
    Xmin = 586241
    Xmax = 589492
    Ymin = 4087339
    Ymax = 4090260
    
    Statistics
    Minimum value = 0.0
    Maximum value = 159.06
    Mean =  105.11
    Standard deviation = 5.78
    
    Coordinate system description
    Projection  UTM
    Zone  10
    Datum  NAD83
    Units  mete
    
    The complete 1-m resolution December 2014 acoustic-backscatter image (backscatter_december_2014_1m_utm10_nad83.tif) was originally archived as a TIFF image with the following attributes.
    Number of rows = 2921
    Number of columns = 3251
    
    Data type = floating point
    
    Boundary
    Xmin = 586241
    Xmax = 589492
    Ymin = 4087339
    Ymax = 4090260
    
    Statistics
    Minimum value = 0.0
    Maximum value = 158.20
    Mean =  103.65
    Standard deviation = 8.10
    
    Coordinate system description
    Projection  UTM
    Zone  10
    Datum  NAD83
    Units  meter
    
    The complete 1-m resolution January 2015 acoustic-backscatter image (backscatter_january_2015_1m_utm10_nad83.tif) was originally archived as a TIFF image with the following attributes.
    Cell size = 1.0
    Number of rows = 2921
    Number of columns = 3251
    
    Data type = floating point
    
    Boundary
    Xmin = 586241
    Xmax = 589492
    Ymin = 4087339
    Ymax = 4090260
    
    Statistics
    Minimum value = 0.0
    Maximum value = 145.00
    Mean =  104.24
    Standard deviation = 6.89
    
    Coordinate system description
    Projection  UTM
    Zone  10
    Datum  NAD83
    Units  meter
    
    The complete 1-m resolution February 2015 acoustic-backscatter image (backscatter_february_2015_1m_utm10_nad83.tif) was originally archived as a TIFF image with the following attributes.
    Cell size = 1.0
    Number of rows = 2921
    Number of columns = 3251
    
    Data type = floating point
    
    Boundary
    Xmin = 586241
    Xmax = 589492
    Ymin = 4087339
    Ymax = 4090260
    
    Statistics
    Minimum value = 0.0
    Maximum value = 156.00
    Mean =  104.40
    Standard deviation = 7.67
    
    Coordinate system description
    Projection  UTM
    Zone  10
    Datum  NAD83
    Units  meter
    
    The complete 1-m resolution March 2015 acoustic-backscatter image (backscatter_march_2015_1m_utm10_nad83.tif) was originally archived as a TIFF image with the following attributes.
    Cell size = 1.0
    Number of rows = 2921
    Number of columns = 3251
    
    Data type = floating point
    
    Boundary
    Xmin = 586241
    Xmax = 589492
    Ymin = 4087339
    Ymax = 4090260
    
    Statistics
    Minimum value = 0.0
    Maximum value = 157.37
    Mean =  108.44
    Standard deviation = 6.04
    
    Coordinate system description
    Projection  UTM
    Zone  10
    Datum  NAD83
    Units  meter
    
    The complete 1-m resolution November 2015 acoustic-backscatter image (backscatter_november_2015_1m_utm10_nad83.tif) was originally archived as a TIFF image with the following attributes.
    Cell size = 1.0
    Number of rows = 2921
    Number of columns = 3251
    
    Data type = floating point
    
    Boundary
    Xmin = 586241
    Xmax = 589492
    Ymin = 4087339
    Ymax = 4090260
    
    Statistics
    Minimum value = 0.0
    Maximum value = 132.00
    Mean =  86.79
    Standard deviation = 6.35
    
    Coordinate system description
    Projection  UTM
    Zone  10
    Datum  NAD83
    Units  meter
    
    The complete 1-m resolution March 2016 acoustic-backscatter image (backscatter_march_2016_1m_utm10_nad83.tif) was originally archived as a TIFF image with the following attributes.
    Cell size = 1.0
    Number of rows = 2921
    Number of columns = 3251
    
    Data type = floating point
    
    Boundary
    Xmin = 586241
    Xmax = 589492
    Ymin = 4087339
    Ymax = 4090260
    
    Statistics
    Minimum value = 0.0
    Maximum value = 150.00
    Mean = 89.66
    Standard deviation = 8.47
    
    Coordinate system description
    Projection  UTM
    Zone  10
    Datum  NAD83
    Units  meter
    
    The complete 1-m resolution June 2016 acoustic-backscatter image (backscatter_june_2016_1m_utm10_nad83.tif) was originally archived as a TIFF image with the following attributes.
    Cell size = 1.0
    Number of rows = 2921
    Number of columns = 3251
    
    Data type = floating point
    
    Boundary
    Xmin = 586241
    Xmax = 589492
    Ymin = 4087339
    Ymax = 4090260
    
    Statistics
    Minimum value = 0.0
    Maximum value = 146.0
    Mean = 92.62
    Standard deviation = 6.30
    
    Coordinate system description
    Projection  UTM
    Zone  10
    Datum  NAD83
    Units  meter
    
    Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Peter Dartnell
    • Kurt J. Rosenberger
    • Curt D. Storlazzi
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Attn: PCMSC Science Data Coordinator
    2885 Mission Street
    Santa Cruz, CA

    831-427-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

The repeat bathymetry and acoustic-backscatter datasets and time-series data were originally collected to study the structure and evolution of a field of rippled scour depressions (RSDs) found in northern Monterey Bay, California. These data are intended for science researchers, students, policy makers, and the general public.

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: 2017 (process 1 of 1)
    Swath bathymetric and acoustic backscatter surveys were conducted with a SWATHplus-M 234-kHz interferometric side-scan sonar system pole-mounted on the U.S. Geological Survey (USGS) R/V Parke Snavely. During the mapping missions, an Applanix POS-MV (Position and Orientation System for Marine Vessels) was used to position the vessel during data collection and it also accounted for vessel motion such as heave, pitch, and roll. The POS-MV also recorded position and vessel motion parameters for later post-processing. Sound-velocity profiles were collected throughout the survey days with a Castaway sound velocimeter. The acoustic-backscatter data were processed using SonarWiz software. The software normalizes for time-varying signal loss and beam directivity differences (D. Finlayson, personnel comm.). The acoustic-backscatter data from all 8 surveys were imported into a single SonarWiz project for processing; this allowed all the backscatter data to be normalized over the 8 surveys. After processing, each individual survey data were gridded into their own grid. The resulting images were then exported as Imagine images and imported into a GIS and converted to grids. The grids were then projected from WGS84 to NAD83 using the WGS84_1984_(ITRF08)_to_NAD_1983_2011 tool in Esri ArcTools.
  3. What similar or related data should the user be aware of?
    Rosenberger, Kurt J., Storlazzi, Curt D., and Dartnell, Peter, 2018, Morphodynamics of a field of crescent-shaped rippled scour depressions, northern Monterey Bay, CA.

    Online Links:

    Other_Citation_Details:
    Rosenberger, K.J., Storlazzi, C.D., and Dartnell, Peter, 2018, Morphodynamics of a field of crescent-shaped rippled scour depressions, northern Monterey Bay, CA: Marine Geology, doi: 10.1016/j.margeo.2018.10.006

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    The accuracy of the SWATHPlus acoustic-backscatter data is unknown since it is believed the backscatter is uncalibrated. Also, during post-processing, the backscatter data from all repeat mapping surveys were gain normalized together so the backscatter data in this report differ from the original individual surveys' data.
  2. How accurate are the geographic locations?
    The Applanix POS-MV post-processed horizontal positional accuracy is about 0.1 m with roll and pitch accuracies of about 0.02 degrees (https://www.applanix.com/downloads/products/specs/posmv/POS-MV-WaveMaster-II.pdf). The SWATHPlus sonar system (234 kHz) has an across track resolution of 5 cm (http://www.bathyswath.com/sites/default/files/documents/ETD_2002_Bathyswath%20information_EN.pdf). Accuracies of final products may be lower due to 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?
    Not applicable to acoustic-backscatter data
  4. Where are the gaps in the data? What is missing?
    Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    No formal logical accuracy tests were conducted.

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 from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originators of the dataset and in products derived from these data. This information is not intended for navigation purposes.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? These data are available in TIFF format (example: backscatter_december_2014_1m_utm10_nad83.tif) contained in a single zip file (example: backscatter_december_2014_1m_utm10_nad83.zip), which includes a tif world file (.tfw) and CSDGM FGDC-compliant metadata.
  3. What legal disclaimers am I supposed to read?
    Neither the U.S. Government, the Department of the Interior, nor the U.S. Geological Survey, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. 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 these data or related materials. Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed and approved for release by 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.
  4. How can I download or order the data?
  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 a TIFF file.

Who wrote the metadata?

Dates:
Last modified: 18-Oct-2018
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/repeat_backscatter_datasets_NMB_2014_2016_metadata.faq.html>
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