Swath bathymetry data collected in 2013 off the islands of Maui and Kaho`olawe, Hawaii, during field activity A-01-13-HW

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Frequently anticipated questions:

What does this data set describe?

Title:
Swath bathymetry data collected in 2013 off the islands of Maui and Kaho`olawe, Hawaii, during field activity A-01-13-HW
Abstract:
1-m resolution bathymetry data were collected during a February 2013 SWATHPlus survey offshore of the Hawaiian Islands of Maui and Kaho`olawe. Data were collected and processed by the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC), with fieldwork activity number A-01-13-HW. The 1-m bathymetry data are provided as a GeoTIFF file.
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=A0113HW 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?
    Gibbs, Ann E., Finlayson, David, and Dartnell, Peter, 20231130, Swath bathymetry data collected in 2013 off the islands of Maui and Kaho`olawe, Hawaii, during field activity A-01-13-HW: data release DOI:10.5066/P9XJLL6C, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Gibbs, Ann E., Finlayson, David, and Dartnell, Peter, 2023, Swath bathymetry and acoustic-backscatter data collected in 2013 off the islands Maui and Kaho`olawe, Hawaii, during field activity A-01-13-HW: data release DOI:10.5066/P9XJLL6C, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

    Other_Citation_Details:
    Suggested Citation: Gibbs, A.E., Finlayson, D., and Dartnell, P., 2023, Swath bathymetry and acoustic-backscatter data collected in 2013 offshore Maui and Kaho`olawe, Hawaii, during field activity A-01-13-HW: U.S. Geological Survey data release, https://doi.org/10.5066/P9XJLL6C.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -156.727
    East_Bounding_Coordinate: -156.605
    North_Bounding_Coordinate: 20.890
    South_Bounding_Coordinate: 20.516
  3. What does it look like?
    A113HW_BathymetryBrowseGraphic.jpg (JPEG)
    Quick view image of the SWATH bathymetry data collected offshore the Hawaiian Islands of Maui and Kaho`olawe by the U.S. Geological Survey during fieldwork activity number A-01-13-HW.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 06-Feb-2013
    Ending_Date: 12-Feb-2013
    Currentness_Reference:
    ground condition at time data were collected.
  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.
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 4
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -159.00000
      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 WGS84.
      The ellipsoid used is WGS84.
      The semi-major axis of the ellipsoid used is 6378137.00.
      The flattening of the ellipsoid used is 1/298.257223563.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: World Geodetic Datum 1984
      Altitude_Resolution: 0.1
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?
    value
    depth in meters relative to Mean Lower Low Water (Source: Producer defined)
    Entity_and_Attribute_Overview:
    The complete 1-m resolution Pu`unoa Point bathymetry grid is a GeoTIFF with the following attributes. 
    Cell size = 1.0
Number of rows = 1991
Number of columns = 1541

Data type = floating point

Boundary
Xmin = 739449.5
Xmax = 740990.5
Ymin = 2309709.5
Ymax = 2311700.5

Statistics
Minimum value = -36.99
Maximum value = -1.31
Mean = -18.42
Standard deviation = 7.54

Coordinate system description
Projection  UTM
Zone  4
Datum  WGS84
Vertical Reference MLLW
Units  meter
    The complete 1-m resolution Kuia Shoal bathymetry grid is a GeoTIFF with the following attributes. 
    Cell size = 1.0
Number of rows = 3551
Number of columns = 4131

Data type = floating point

Boundary
Xmin = 736819.5
Xmax = 740950.5
Ymin = 2270109.5
Ymax = 2273660.5

Statistics
Minimum value = -51.68
Maximum value = -2.04
Mean = -21.48
Standard deviation = 6.40

Coordinate system description
Projection  UTM
Zone  4
Datum  WGS84
Vertical Reference MLLW
Units  meter
    The complete 1-m resolution Olowalu bathymetry grid is a GeoTiff with the following attributes. 
    Cell size = 1.0
Number of rows = 2458
Number of columns = 1054

Data type = floating point

Boundary
Xmin = 746795.0
Xmax = 749253.0
Ymin = 2302122.7
Ymax = 2303175.7

Statistics
Minimum value = -12.57
Maximum value = -1.12
Mean = -6.84
Standard deviation = 2.01

Coordinate system description
Projection  UTM
Zone  4
Datum  WGS84
Vertical Reference MLLW
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)
    • Ann E. Gibbs
    • David Finlayson
    • Peter Dartnell
  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?

In February 2013, staff from the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC) collected bathymetry and acoustic backscatter data offshore the islands of Maui (Olowalu, Pu`unoa Point) and Kaho`olawe (Kuia Shoal), Hawaii using an interferometric bathymetric sidescan sonar system mounted to the hull of the vessel AlyceC. The acquisition was conducted to support seafloor characterization and benthic habitat mapping efforts in selected nearshore coral reef environments of Hawaii. These data are intended for science researchers, students, policy makers, and the general public. These data can be used with geographic information systems or other software to identify bathymetric features. These data are not intended to be used for navigation.

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: 2015 (process 1 of 1)
    In February 2013 the USGS, PCMSC mapped two sites offshore the islands of Maui (Olowalu and Pu`unoa Point) and one site off the island of Kaho`olawe (Kuia Shoal) in Hawaii. A SEA 234-kHz Interferometric SWATHplus-M bathymetric sonar system was pole-mounted to the starboard gunwale of the vessel Alyce C. Water column sound velocity data that was collected throughout the survey was applied to the data during collection as well as tide data from a local tide station. Based on observed tides, an adjustment was made to shift data from WGS84 ellipsoid elevations to MLLW datum. For Maui data the difference between MLLW and WGS84 was about 16.1 m. The survey line files were imported into Caris HIPS and SIPS software (version 9) for bathymetric processing. The data were cleaned of obvious bad soundings and the soundings were gridded into a 1-m resolution surface. The surface was exported as a 1-m resolution GeoTiff raster file in UTM, zone 4, WGS-84 coordinates relative to Mean Lower Low Water.
  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?
    The SWATHPlus sonar system's (234 kHz) depth accuracy reduces with horizontal range. The system has an estimated vertical depth uncertainty ranging from about 0.05 m to 0.34 m over a horizontal range of 0 to 90 m. 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.
  2. How accurate are the geographic locations?
    Estimated to be no less than 1 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?
    Estimated to be no less than 0.5% water depth, 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.
  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 - CMGDS
    2885 Mission Street
    Santa Cruz, CA

    831-427-4747 (voice)
    pcmsc_data@usgs.gov
  2. What's the catalog number I need to order this data set? These data are available in GeoTIFF format, including a tif world file (.tfw) and are accompanied by CSDGM FGDC-compliant metadata.
  3. What legal disclaimers am I supposed to read?
    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 for accuracy and completeness 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 GeoTIFF file.

Who wrote the metadata?

Dates:
Last modified: 30-Nov-2023
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/DataReleases/CMGDS_DR_tool/DR_P9XJLL6C/A-01-13-HW_bathymetry_1m_UTM04_WGS84_MLLW_metadata.faq.html>
Generated by mp version 2.9.51 on Fri Dec 15 14:16:32 2023