Coastal Multibeam Bathymetry Data Collected in August 2022 From Breton Island, Louisiana

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Frequently anticipated questions:

What does this data set describe?

Title:
Coastal Multibeam Bathymetry Data Collected in August 2022 From Breton Island, Louisiana
Abstract:
An Ellipsoidally Referenced Survey (ERS) using two Teledyne Reson SeaBat T50-P multibeam echosounders, in dual-head configuration, was conducted by the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center (SPCMSC) covering the nearshore, Gulf side of Breton Island, Louisiana (LA), from August 2-5, 2022. This dataset, Breton_2022_MBES_xyz.zip, includes the processed elevation point data (x,y,z), as derived from a 1-meter (m) bathymetric grid.
Supplemental_Information:
The processed sonar data are provided as American Standard Code for Information Interchange (ASCII) x,y,z point data files. These values are not the individual soundings, but nodes from a 1-m bathymetric grid. The Z value for the node is generated by utilizing a Combined Uncertainty and Bathymetry Estimator (CUBE) surface and has an estimated total value of uncertainty (Calder and Wells, 2007). The bathymetry data were collected and processed in the World Geodetic System of 1984 (WGS84) (G1150 realization) horizontal and vertical datums, and were subsequently transformed using the National Oceanic and Atmospheric Administration's (NOAA) VDatum version 4.2.2 (v.4.2.2) transformation software (https://vdatum.noaa.gov/) horizontally to the North American Datum of 1983 (NAD83 [2011]) and vertically to the North American Vertical Datum of 1988 (NAVD88) relative to the GEOID model of 2018 (GEOID18).
  1. How might this data set be cited?
    Stalk, Chelsea A., Farmer, Andrew S., and Flocks, James G., 20241007, Coastal Multibeam Bathymetry Data Collected in August 2022 From Breton Island, Louisiana:.

    This is part of the following larger work.

    Stalk, Chelsea A., Farmer, Andrew S., and Flocks, James G., 20241007, Coastal Multibeam Bathymetry Data Collected in August 2022 From Breton Island, Louisiana: U.S. Geological Survey data release doi:10.5066/P13OMHNZ, U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center, St. Petersburg, Florida.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -89.18871485
    East_Bounding_Coordinate: -89.09223983
    North_Bounding_Coordinate: 29.48448296
    South_Bounding_Coordinate: 29.09223983
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 02-Aug-2022
    Ending_Date: 05-Aug-2022
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: tabular digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (13,547,475)
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 16
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -87.000000
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000.0
      False_Northing: 0.0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.6096
      Ordinates (y-coordinates) are specified to the nearest 0.6096
      Planar coordinates are specified in meters
      The horizontal datum used is World Geodetic System of 1984.
      The ellipsoid used is WGS_84.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257223563.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: World Geodetic System of 1984
      Altitude_Resolution: 0.001
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method: Attribute values
  7. How does the data set describe geographic features?
    2022_328_Breton_MBES_1m_WGS84_UTM16N.xyz
    ASCII text (.txt) file containing the processed 1-m bathymetric grid x,y,z data in the WGS84 [G1150] realization (ellipsoid height). (Source: HYPACK®)
    WGS84_UTM16N_X
    WGS84 UTM Zone 16N X-coordinate (easting) of sample point, in meters. (Source: HYPACK®)
    Range of values
    Minimum:287791.000
    Maximum:297069.000
    Resolution:0.001
    WGS84_UTM16N_Y
    WGS84 UTM Zone 16N Y-coordinate (northing) of sample point, in meters. (Source: HYPACK®)
    Range of values
    Minimum:3258974.000
    Maximum:3263489.000
    Resolution:0.001
    WGS84_Z
    WGS84 (ellipsoid height) of sample point, in meters. (Source: HYPACK®)
    Range of values
    Minimum:-39.723
    Maximum:-27.200
    Resolution:0.001
    TPU
    TPU = Total Propagated Uncertainty, in meters. (Source: Teledyne CARIS™)
    Range of values
    Minimum:0.039
    Maximum:0.280
    Resolution:0.001
    2022_328_Breton_MBES_1m_NAD83_UTM16N_NAVD88_G18.xyz
    ASCII text (.txt) file containing the processed 1-m bathymetric grid x,y,z data in NAD83 [2011], NAVD88, which were derived using the GEOID18 model (orthometric height). (Source: VDatum)
    NAD83_UTM16N_X
    NAD83 UTM Zone 16N X-coordinate (easting) of sample point, in meters. (Source: VDatum)
    Range of values
    Minimum:287791.84700
    Maximum:297069.84494
    Resolution:0.00001
    NAD83_UTM16N_Y
    NAD83 UTM Zone 16N Y-coordinate (northing) of sample point, in meters. (Source: VDatum)
    Range of values
    Minimum:3258973.43772
    Maximum:3263488.43652
    Resolution:0.00001
    NAVD88_GEOID18_Z
    NAVD88 (orthometric height) of sample point, in meters, with respect to GEOID12B. (Source: VDatum)
    Range of values
    Minimum:-13.942
    Maximum:-1.381
    Resolution:0.001
    TPU_WGS84
    Total Propagated Uncertainty, in meters, as reported for WGS84 (G1150) data. A static uncertainty value of 5.991 cm is associated with the transformation of this data. (Source: Teledyne CARIS™)
    Range of values
    Minimum:0.039
    Maximum:0.280
    Resolution:0.001

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Chelsea A. Stalk
    • Andrew S. Farmer
    • James G. Flocks
  2. Who also contributed to the data set?
    U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
  3. To whom should users address questions about the data?
    Chelsea A. Stalk
    U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
    Electronics Technician (Marine Instrumentation)
    600 4th Street South
    St. Petersburg, FL
    USA

    (727)502-8000 (voice)
    cstalk@usgs.gov

Why was the data set created?

The purpose of the survey was to develop a baseline digital elevation model of the seafloor environment around Breton Island for comparison with both previous and future elevation assessments, and to evaluate elevation change following island restoration. Data were collected during USGS Field Activity Number (FAN) 2022-328-FA. Single-beam bathymetry data and seismic reflection data were acquired as a part of the same field activity, refer to Lyons and others (2024) and Forde and others (2023) for further details. Additional survey and data details are available from the USGS Coastal and Marine Geoscience Data System (CMGDS) at, https://cmgds.marine.usgs.gov/fan_info.php?fan=2022-328-FA.

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: 05-Aug-2022 (process 1 of 3)
    Acquisition: An ERS consisting of multibeam bathymetry was conducted using two Teledyne Reson SeaBat T50-P multibeam echosounders, in dual-head configuration. The pair of Mills Cross (configuration) transmit and receive arrays, were placed side-by-side within a bracket that oriented them at opposing 30-degree angles (relative to horizontal). The bracket was pole-mounted on the starboard gunnel of the research vessel (R/V) Sallenger, a 26-foot fiberglass vessel. The sonar arrays were oriented athwartships (primary and secondary arrays facing outward and down to port and starboard, respectively) and located approximately 1-m below the waterline when deployed. An Applanix Pos MV Wavemaster II V5 inertially aided navigation system was used for timing, positioning, and attitude. The Inertial Measurement Unit (IMU) was mounted atop the sonar bracket just aft of the pole. Two Trimble GA830 Global Navigation Satellite System (GNSS) antennas were affixed atop the cabin approximately amidships of the vessel, two meters apart, port-starboard. An AML Oceanographic Micro-X sound velocity sensor was used for speed of sound readings at the sonar head. A Sontek CastAway CTD was used for measuring sound velocity profiles. Hydrographic survey acquisition and processing software, HYPACK® and HYPACK HYSWEEP® (version 2021.0.2.0) managed data inputs from sensors and produced two files (.RAW and .HSX). Data were collected in WGS84 (G1150) Universal Transverse Mercator (UTM) Zone 16 North (16N) coordinates. Person who carried out this activity:
    Andrew S. Farmer
    U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    afarmer@usgs.gov
    Date: 2023 (process 2 of 3)
    Processing: Positioning and attitude data were post-processed in Applanix POSPac MMS (POSPac) software version 8.8 Service Pack 1. Raw position files were imported into POSPac and processed with the IN-Fusion PP-RTX processing mode utilizing Trimble CenterPoint RTX technology, creating smoothed best estimate of trajectory (SBET) files and dynamic error files (SMRMSG) for each day of the survey. Bathymetric data were post-processed in Teledyne CARIS™ Hydrographic processing software HIPS and SIPS version 11.4.28. HYPACK® acquisition files (.HSX) were first imported into CARIS™ and then post-processed navigation files (SBET and SMRMSG) were imported and applied. Additionally, Global Positioning System (GPS) tide (GPS tidal corrections utilize GPS height information from real time survey observations to obtain an ellipsoid height) was computed and sound velocity profiles were applied. Roll calibration was also performed, as necessary. TPU was calculated from real time values recorded in the HSX and the SMRMSG files. Data were filtered to exclude any points with RESON Quality flags of 0, 1, and 2 (these flags are assigned to individual soundings at the time of acquisition and are a metric of pass/fail in regard to both brightness and collinearity: 0 = fail both, 1 = pass brightness only, 2 = pass collinearity only), as well as soundings that had a TPU greater than stated IHO Special Order standards (IHO, 2008). Refraction artifacts were addressed using Refraction Editor. Further editing was performed in Subset Editor. A 1-m bathymetric CUBE surface was computed and a visual and statistical inspection of the data effecting the surface was performed and edited as needed to serve as quality control (Calder and Wells, 2007). Gaps in the continuous surface were caused by limitations in swath width and planned line navigation within shallow waters. The final surface was exported as an x,y,z ASCII file using the Base Surface to ASCII function. Person who carried out this activity:
    Chelsea A. Stalk
    U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    cstalk@usgs.gov
    Data sources produced in this process:
    • 2022_328_Breton_MBES_1m_WGS84_UTM16N.xyz
    Date: 2023 (process 3 of 3)
    Datum Transformation: Final x,y,z data were converted using NOAA's VDatum v.4.2.2 software conversion tool from the WGS84 [G1150] realization to NAD83 [2011] NAVD88, using the GEOID18 model (orthometric height). Person who carried out this activity:
    Chelsea A. Stalk
    U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    cstalk@usgs.gov
    Data sources produced in this process:
    • 2022_328_Breton_MBES_1m_NAD83_UTM16N_NAVD88_G18.xyz
  3. What similar or related data should the user be aware of?
    Calder, Brian R., and Wells, David E., 20070129, CUBE User's Manual: University of New Hampshire, Center for Coastal and Ocean Mapping, Durham, NH.

    Online Links:

    Other_Citation_Details: pages 1-54
    Organization, International Hydrographic, 200802, IHO Standards for Hydrographic Surveys: International Hydrographic Bureau, 4, quai Antoine 1er B.P. 445 - MC 98011 MONACO Cedex Principaute de Monaco.

    Online Links:

    Other_Citation_Details: pages 1-28
    Lyons, Erin O., DeWitt, Nancy T., Flocks, Jim G., Reynolds, Billy J., Farmer, Andrew S., Bernier, Julie C., Galbraith, Benjamin A., Stalk, Chelsea A., Nieckoski, Natasha J., and Reynolds, Maxwell O., 20240220, Coastal Single-beam Bathymetry Data Collected in 2022 From Breton Island, Louisiana: U.S. Geological Survey data release doi:10.5066/P97NH83J, U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center, St. Petersburg, Florida.

    Online Links:

    Forde, Arnell S., Flocks, James G., and Farmer, Andrew S., 20231101, Archive of Chirp Subbottom Profile Data Collected in 2022 From Breton Island, Louisiana: U.S. Geological Survey data release doi:10.5066/P9Q28MFD, U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center, St. Petersburg, Florida.

    Online Links:

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

  1. How well have the observations been checked?
    This dataset was from a single research cruise with exact instrumentation and set up and were therefore internally consistent. Methods were employed to maintain data collection consistency aboard the platform. During mobilization, each piece of equipment was isolated to obtain internal and external offset measurements with respect to the survey platform. All the critical measurements were recorded manually and digitally entered into their respective programs.
  2. How accurate are the geographic locations?
    All data were collected and processed to meet or exceed International Hydrographic Organization (IHO) Special Order standards for positioning and depth (IHO, 2008). Individual Total Propagated Uncertainty (TPU) values associated with each node are available in the x,y,z file, with a mean value of 0.056 m.
  3. How accurate are the heights or depths?
    All data were collected and processed to meet or exceed IHO Special Order standards for positioning and depth (IHO, 2008). Individual TPU values associated with each node are available in the x,y,z file, with a mean value of 0.056 m. Data transformed using Vdatum have an additional reported vertical transformation error of 5.991 centimeters (cm).
  4. Where are the gaps in the data? What is missing?
    These are complete post-processed x,y,z bathymetric data points from multibeam data collected nearshore Breton Island, Louisiana, August 2022.
  5. How consistent are the relationships among the observations, including topology?
    These files represent the post-processed bathymetric data (x,y,z) during a multibeam bathymetry survey.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints None. There are no access constraints associated with this data.
Use_Constraints Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. The U.S. Geological Survey requests to be acknowledged as originator of these data in future products or derivative research.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
    Attn: USGS SPCMSC Data Management
    600 4th Street South
    Saint Petersburg, FL
    United States

    727-502-8000 (voice)
    gs-g-spcmsc_data_inquiries@usgs.gov
  2. What's the catalog number I need to order this data set? 2022_328_Breton_MBES_1m_WGS84_UTM16N.xyz, 2022_328_Breton_MBES_1m_NAD83_UTM16N_NAVD88_G18.xyz
  3. What legal disclaimers am I supposed to read?
    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 shall not be held liable for improper or incorrect use of the data described or contained herein. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 07-Oct-2024
Metadata author:
U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
Attn: USGS SPCMSC Data Management
600 4th Street South
Saint Petersburg, FL
United States

727-502-8000 (voice)
gs-g-spcmsc_data_inquiries@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/Breton_2022_MBES_metadata.faq.html>
Generated by mp version 2.9.51 on Mon Oct 7 11:39:37 2024