Metadata:
  Identification_Information:
    Citation:
      Citation_Information:
        Originator: Nancy T. DeWitt
        Originator: James G. Flocks
        Originator: Julie C. Bernier
        Publication_Date: 20260423
        Title: Coastal Single-beam Bathymetry Data Collected in 2024 From Breton Island, Louisiana
        Geospatial_Data_Presentation_Form: tabular and vector digital data
        Larger_Work_Citation:
          Citation_Information:
            Originator: Nancy T. DeWitt
            Originator: James G. Flocks
            Originator: Julie C. Bernier
            Publication_Date: 20260423
            Title: Coastal Single-Beam Bathymetry Data Collected in 2024 From Breton Island, Louisiana
            Series_Information:
              Series_Name: U.S. Geological Survey data release
              Issue_Identification: doi:10.5066/P14M8EZU
            Publication_Information:
              Publication_Place: St. Petersburg, Florida
              Publisher: U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
            Online_Linkage: https://doi.org/10.5066/P14M8EZU
    Description:
      Abstract: As part of the restoration monitoring component of the Deepwater Horizon early restoration project, scientists from the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center (USGS SPCMSC) conducted single-beam and multibeam bathymetry surveys around Breton Island, Louisiana (LA), from August 5-10, 2024, for Field Activity Number (FAN) 2024-320-FA. The purpose of data collection was to measure submerged elevations and develop a digital elevation model of the seafloor around Breton Island. These data were collected as part of the Louisiana Outer Coast Restoration Construction Monitoring project supported by funding from the Natural Resource Damage Assessment - Deepwater Horizon Restoration Activities and, in combination with both previous and planned future surveys, can be used to evaluate elevation change following island restoration. The survey area covered approximately 77 square kilometers (km^2) of nearshore environment surrounding Breton Island and extended into the adjacent portion of the former Mississippi River to Gulf Outlet (MRGO). The single-beam bathymetry was acquired using two 12-foot personal watercraft (PWC) and one 20-foot power catamaran. All vessels were outfitted with high precision Global Navigation Satellite System (GNSS) receivers, motion reference units, and survey grade single-beam echosounders (SBES). For additional information on post-processing steps, please refer to DeWitt and others (2016) and Hansen and others (2017). Multibeam echosounder (MBES) data including the backscatter component and chirp seismic sub-bottom data were collected concurrently as part of FAN 2024-320-FA; those data are available as separate data releases: Bemelmans and others (2025); Forde and others (2025), respectively.
      Purpose: To conduct a nearshore single-beam bathymetry survey during the summer of 2024 that replicated coastal single-beam bathymetry data collected in 2022 from Breton Island, Louisiana (Lyons and others, 2024).
      Supplemental_Information: Single-beam data and associated files were collected during USGS Field Activity Number (FAN) 2024-320-FA. Vessel specific single-beam bathymetry echosounder data (SBES) were assigned subFANs; 24BIM07 (Research Vessel [R/V] G. Hill - TVEE), 24BIM08 (R/V Shark - WVR1) and 24BIM09 (R/V Chum - WVR2). The x,y,z data are provided in American Standard Code for Information Interchange (ASCII) text format as: (1) World Geodetic System 1984 (WGS84) realization G2139, Universal Transverse Mercator (UTM) Zone 16 North (N) for the horizontal and WGS84 (G2139) ellipsoidal height in meters (m) for the vertical; and (2) North American Datum of 1983 (NAD83) realization 2011 for the horizontal, and North American Vertical Datum 1988 (NAVD88) orthometric height in meters with respect to GEOID18 for the vertical. These data should not be used for navigational purposes. Additional survey and data details are available from the USGS Coastal and Marine Geoscience Data System (CMGDS) at, https://cmgds.marine.usgs.gov/services/activity.php?fan=2024-320-FA. 
    Time_Period_of_Content:
      Time_Period_Information:
        Range_of_Dates/Times:
          Beginning_Date: 20240806
          Ending_Date: 20240810
      Currentness_Reference: ground condition
    Status:
      Progress: Complete
      Maintenance_and_Update_Frequency: None planned
    Spatial_Domain:
      Bounding_Coordinates:
        West_Bounding_Coordinate: -89.2387412
        East_Bounding_Coordinate: -89.0932354
        North_Bounding_Coordinate: 29.5359716
        South_Bounding_Coordinate: 29.4217234
    Keywords:
      Theme:
        Theme_Keyword_Thesaurus: USGS Metadata Identifier
        Theme_Keyword: USGS:9e25e5cd-47a8-4f68-a585-16879e9b7ad4
      Theme:
        Theme_Keyword_Thesaurus: ISO 19115 Topic Category
        Theme_Keyword: geoscientificInformation
        Theme_Keyword: elevation
        Theme_Keyword: oceans
        Theme_Keyword: location
        Theme_Keyword: imageryBaseMapsEarthCover
      Theme:
        Theme_Keyword_Thesaurus: Global Change Master Directory
        Theme_Keyword: EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > BATHYMETRY > COASTAL BATHYMETRY
        Theme_Keyword: GOVERNMENT AGENCIES-U.S. FEDERAL AGENCIES > DOI > USGS DOI/USGS/CMG/SP> ST. PETERSBURG COASTAL AND MARINE SCIENCE CENTER, COASTAL AND MARINE GEOLOGY, U.S. GEOLOGICAL SURVEY, U.S. DEPARTMENT OF THE INTERIOR
      Theme:
        Theme_Keyword_Thesaurus: USGS Thesaurus
        Theme_Keyword: marine geology
        Theme_Keyword: geophysics
        Theme_Keyword: bathymetry
        Theme_Keyword: single-beam echo sounder
        Theme_Keyword: ocean characteristics
        Theme_Keyword: ocean processes
        Theme_Keyword: geospatial datasets
      Theme:
        Theme_Keyword_Thesaurus: None
        Theme_Keyword: U.S. Geological Survey
        Theme_Keyword: hydrography
        Theme_Keyword: trackline
        Theme_Keyword: single-beam bathymetry
      Place:
        Place_Keyword_Thesaurus: Common Geographic Areas
        Place_Keyword: Louisiana
        Place_Keyword: United States
        Place_Keyword: Breton Islands
        Place_Keyword: Breton Sound
        Place_Keyword: Gulf of America

      Place:
        Place_Keyword_Thesaurus: None
        Place_Keyword: Breton Island, Louisiana
        Place_Keyword: Gulf of Mexico
        Place_Keyword: Mississippi River to Gulf Outlet
      Temporal:
        Temporal_Keyword_Thesaurus: None
        Temporal_Keyword: 2024
    Access_Constraints: No access constraints. Please see 'Distribution Information' for details. 
    Use_Constraints: These data are marked with a Creative Common CC0 1.0 Universal License.
    Point_of_Contact:
      Contact_Information:
        Contact_Person_Primary:
          Contact_Person: Nancy T. DeWitt
          Contact_Organization: U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
        Contact_Position: Geologist
        Contact_Address:
          Address_Type: mailing and physical address
          Address: 600 4th Street South
          City: St. Petersburg
          State_or_Province: FL
          Postal_Code: 33701-4846
          Country: USA
        Contact_Voice_Telephone: 727-502-8000
        Contact_Electronic_Mail_Address: ndewitt@usgs.gov
    Data_Set_Credit:  Funding and (or) support for this study was provided as part of the restoration monitoring component of the Deepwater Horizon early restoration project. The authors would like to thank members of the USGS SPCMSC Operations staff specifically Billy J. Reynolds, Benjamin A. Galbraith, Christopher C. Bemelmans, and Maxwell O. Reynolds for their field acquisition support. This document was improved by scientific/editorial and metadata reviews from Andrew S. Farmer, Jennifer L. Miselis, and Breanna N. Williams of the SPCMSC.
    Native_Data_Set_Environment: Environment as of Metadata Creation: Microsoft Windows 11 Enterprise Version 23H2 (Build 22631.4317); RINEX Converter version 5.1.0; National Oceanic and Atmospheric Administration (NOAA) National Geodetic Survey (NGS) Online Positioning User Service (OPUS) (https://geodesy.noaa.gov/OPUS/); Horizontal Time-Dependent Positioning (HTDP) online transformation utility version 3.5.0 (https://www.ngs.noaa.gov/TOOLS/Htdp/Htdp.shtml); NovAtel's Waypoint software GrafNav version 9.00.2207; HYPACK® A Xylem Brand version 22.3.4.0; Environmental Systems Research Institute (Esri) ArcGIS Pro version 3.3.2; NOAA NGS VDatum software version 4.7.1 (https://vdatum.noaa.gov/).
    Cross_Reference:
      Citation_Information:
        Originator: Erin O. Lyons
        Originator: Nancy T. DeWitt
        Originator: James G. Flocks
        Originator: Billy J. Reynolds
        Originator: Andrew S. Farmer
        Originator: Julie C. Bernier
        Originator: Benjamin A. Galbraith
        Originator: Chelsea A. Stalk
        Originator: Natasha J. Nieckoski
        Originator: Maxwell O. Reynolds
        Publication_Date: 20240220
        Title: Coastal Single-beam Bathymetry Data Collected in 2022 From Breton Island, Louisiana
        Series_Information:
          Series_Name: U.S. Geological Survey data release
          Issue_Identification: doi:10.5066/P97NH83J
        Publication_Information:
          Publication_Place: St. Petersburg, Florida
          Publisher: U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
        Online_Linkage: https://doi.org/10.5066/P97NH83J
    Cross_Reference:
      Citation_Information:
        Originator: Arnell S. Forde
        Originator: Chelsea A. Stalk
        Originator: James G. Flocks
        Publication_Date: 20250312
        Title: Chirp Sub-Bottom Profile Geophysical Data Collected in 2024 Offshore of Breton Island, Louisiana
        Series_Information:
          Series_Name: U.S. Geological Survey data release
          Issue_Identification: doi:10.5066/P13SMFT7
        Publication_Information:
          Publication_Place: St. Petersburg, Florida
          Publisher: U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
        Online_Linkage: https://doi.org/10.5066/P13SMFT7
    Cross_Reference:
      Citation_Information:
        Originator: Christopher C. Bemelmans
        Originator: Chelsea A. Stalk
        Originator: James G. Flocks
        Publication_Date: 20250402
        Title: Coastal Multibeam Bathymetry and Backscatter Data Collected in August 2024 From Breton Island, Louisiana
        Series_Information:
          Series_Name: U.S. Geological Survey data release
          Issue_Identification: doi:10.5066/P13BWAJC
        Publication_Information:
          Publication_Place: St. Petersburg, Florida
          Publisher: U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
        Online_Linkage: https://doi.org/10.5066/P13BWAJC
    Cross_Reference:
      Citation_Information:
        Originator: NovAtel
        Publication_Date: 202307
        Title: Waypoint Software 9.00 User Manual v11
        Publication_Information:
          Publication_Place: Alberta, Canada
          Publisher: Novatel Inc.
        Online_Linkage: https://hexagondownloads.blob.core.windows.net/public/Novatel/assets/Documents/Manuals/Waypoint-Software-User-Manual-OM-20000166/Waypoint_9.00_Software_User_Manual.pdf
    Cross_Reference:
      Citation_Information:
        Originator: Xylem
        Publication_Date: 2023
        Title: HYPACK® 2023 User Manual
        Publication_Information:
          Publication_Place: Middletown, CT
          Publisher: A Xylem brand
        Online_Linkage: https://www.xylem.com/siteassets/brand/hypack/resources/manual/2023-hypack-user-manual.pdf
    Cross_Reference:
      Citation_Information:
        Originator: Nancy T. DeWitt
        Originator: Joseph J. Fredericks
        Originator: James G. Flocks
        Originator: Jennifer L. Miselis
        Originator: Stanley D. Locker
        Originator: Jack L. Kindinger
        Originator: Julie C. Bernier
        Originator: Kyle W. Kelso
        Originator: Billy J. Reynolds
        Originator: Dana S. Wiese
        Originator: Trevor N. Browning
        Publication_Date: 20160801
        Title: Archive of Bathymetry and Backscatter Data Collected in 2014 Nearshore Breton and Gosier Islands, Breton National Wildlife Refuge, Louisiana
        Series_Information:
          Series_Name: U.S. Geological Survey Data Series
          Issue_Identification: 1005
        Publication_Information:
          Publication_Place: Reston, VA
          Publisher: U.S. Geological Survey
        Online_Linkage: https://doi.org/10.3133/ds1005
    Cross_Reference:
      Citation_Information:
        Originator: Mark E. Hansen
        Originator: Nancy T. Dewitt
        Originator: Billy J. Reynolds
        Publication_Date: 20170810
        Title: Archive of Bathymetry Data Collected in South Florida From 1995 to 2015
        Series_Information:
          Series_Name: U.S. Geological Survey Data Series
          Issue_Identification: 1031
        Publication_Information:
          Publication_Place: Reston, VA
          Publisher: U.S. Geological Survey
        Online_Linkage: https://doi.org/10.3133/ds1031
  Data_Quality_Information:
    Attribute_Accuracy:
      Attribute_Accuracy_Report: This dataset is derived from one survey using three vessels with identical equipment systems and acquisition settings. Prior to deployment, each vessel's equipment offsets were surveyed in using a Spectra Precision Geodimeter total station. Offsets between the single-beam transducers, motion reference unit, and the antenna reference point (ARP) were precisely measured with respect to the vessels frame of reference. During mobilization, the offset measurements were field checked and verified against the total station measurements. Total station offsets were then digitally entered into the acquisition and (or) processing software. Methods were employed to maintain data collection consistency aboard the vessels. Differential Global Positioning System (DGPS) base station coordinates were obtained by post-processing through NOAA NGS OPUS. Roving vessels remained within < 10-km of the bases station. The navigation positioning data were post processed using NovAtel 's Waypoint Software GrafNav. For more information on the dataset's accuracy, see the 'Quality Control, Quality Assurance (QA/QC) and Uncertainty Analysis' process step below.
    Logical_Consistency_Report: These data were collected during one survey with consistent instrument calibrations and consistent acquisition methods.
    Completeness_Report: This data release contains single-beam bathymetry data points (x,y,z) collected in August 2024 around Breton Island, Louisiana. The horizontal positions and vertical elevations are provided in two datums, 1) WGS84 (G2139) and ellipsoid height, and 2) NAD83(2011) NAVD88 UTM 16N GEOID18. These datasets are considered complete. Users are advised to read the complete metadata record carefully for additional details.     
    Positional_Accuracy:
      Horizontal_Positional_Accuracy:
        Horizontal_Positional_Accuracy_Report: The USGS-SPCMSC benchmark BRET, installed in 2007 on Breton Island for USGS data acquisition and processing, was used for local control. The maximum horizontal surface vector distance from the base station to all three roving vessels was 8.34 km. The coordinate values of the GNSS base station BRET are the time-weighted average of values obtained from NOAA NGS OPUS for all occupations during the surveys in 2022 (Lyons and others, 2024). The estimated horizontal accuracy (2-sigma) of the post-processed base coordinates for BRET is +/- 0.00024 seconds latitude and +/- 0.00013 seconds longitude. Horizontal positional accuracy associated with each data point was determined by post-processed differential correction of the base/rover GNSS sessions using GrafNav. Processing the full-carrier phase data allows precise positioning of the base and rover receivers. Differential processing improves the rover positions by assessing positional errors computed at the base receiver and applying those errors or differences to the rover receiver. Forward and backward time-series processing of the kinematic (rover) data provides an independent combined smoothed-trajectory solution of the baseline between the rover position and the base station. The positional accuracy can be estimated by differencing the time series (position separation). The averaged post-processed standard deviation horizontal accuracy (2-sigma) for all kinematic rover data processed to the BRET benchmark was 0.008 +/- 0.005 meters (m).
      Vertical_Positional_Accuracy:
        Vertical_Positional_Accuracy_Report: As described in the horizontal position accuracy report, coordinate values for BRET base station were the time-weighted average of values from the NOAA NGS OPUS. The averaged vertical accuracy (2-sigma) of the post-processed base coordinates for BRET are +/- 0.012 m. The vertical position accuracy associated with each data point were determined by post-processed differential correction of the base/rover GNSS sessions using GrafNav. The average post-processed standard deviation vertical accuracy (2-sigma) for all kinematic rover data processed to the BRET benchmark was 0.015 +/- 0.010 m.
    Lineage:
      Process_Step:
        Process_Description: GNSS Acquisition: BRET benchmark located on Breton Island, Louisiana was used for local navigation control. It was equipped with a Spectra Precision SP90M GNSS receiver with a Trimble Zephyr 3 Base GNSS antenna recording full-carrier-phase positioning signals from satellites at a rate of 0.1 second (s) (equal to 10 hertz [Hz]). The same GNSS receivers were used on the rovers, except the GNSS antennas varied by vessel (TVEE - Trimble® Zephyr 3 Rover; WVR1/WVR2 - Spectra Precision® SPGA Rover). The base station GNSS data files were converted from Spectra Precision proprietary G-file formats (e.g. GBRETA24.218) into the non-proprietary Receiver Independent Exchange Format (RINEX [https://igs.org/wg/Rinex/]) version 2.11 (e.g. BRET218A.24O) for submission to NOAA NGS OPUS. In preparation for post processing at a later step, using the RINEX converter again, both the base and rover G-files were converted into RINEX version 3.04 (e.g. TVEE00000_R_20242182001_02H_10Z_MO) which converts all the satellite constellations tracked by the antenna (GPS, GLONASS, Bideau, and Galileo). An example of the RINEX 2.11 filename is TVEE219A.24O where the convention TVEE is the four-letter site name, 219 is the day of year, A is the session A-Z, 24 is the year, O represents the observation file, N is the navigation file, M is meteorological file, and G is the GLONASS navigation message file. An example of the RINEX 3.04 filename is TVEE00000_R_20242182001_02H_10Z_MO where the convention TVEE00000 is the nine-letter site name, R is the data source (R - receiver), 20242182001 is the year (2024), day of year (218), and UTC start time of the file in HHMM (2001), 02H is the file time (2 hours), and the 10Z is the recording rate (10 Hz), MO is the mixed observation file, MN is the mixed navigation file, and MM is meteorological file.
        Source_Used_Citation_Abbreviation:  Spectra Precision proprietary G-Files
        Process_Date: 2024
        Source_Produced_Citation_Abbreviation: RINEX version 2.11 format files.
        Source_Produced_Citation_Abbreviation: RINEX version 3.04 format files.
        Process_Contact:
          Contact_Information:
            Contact_Person_Primary:
              Contact_Person: Nancy T. DeWitt
              Contact_Organization: U.S. Geological Survey
            Contact_Position: Geologist
            Contact_Address:
              Address_Type: mailing and physical address
              Address: 600 4th Street South
              City: St. Petersburg
              State_or_Province: FL
              Postal_Code: 33701-4846
              Country: USA
            Contact_Voice_Telephone: 727-502-8000
            Contact_Electronic_Mail_Address: ndewitt@usgs.gov
      Process_Step:
        Process_Description: Single-Beam Bathymetry Acquisition: A total of 583 line-km of SBES data were collected as part of FAN 2024-320-FA: the R/V G. Hill (TVEE - 24BIM07) collected 308.60 line-km, R/V Shark (WVR1- 24BIM08) collected 151.82 line-km, and R/V Chum (WVR2-24BIM09) collected 122.47 line-km of data. Boat motion (heave, roll, pitch) was recorded on each vessel at 50-millisecond (ms) intervals using an SBG Ellipse Series A motion sensors. HYPACK®, a marine surveying, positioning, and navigation software package, managed the planned-transect information and provided real-time navigation parameters, course corrections, data quality parameters, and instrumentation-status to the boat operator. Depth soundings were recorded at 50-ms intervals using a Teledyne Odom ECHOTRAC CV100  echosounder with a 4-degree, 200-kilohertz (kHz) transducer on the TVEE, WVR1, and WVR2. For each vessel, data from the GNSS receiver, motion sensor, and echosounder were recorded in real-time and merged into a single raw data file (.RAW) in HYPACK®, with each device string referenced by a device identification code and time stamped to Coordinated Universal Time (UTC). Sound velocity profile (SVP) measurements were collected using SonTek Castaway-CTD® (Conductivity, Temperature, and Depth) instruments. The CTD units were cast overboard to record changes in water column speed of sound (SOS) spatially and temporally. A total of 312 casts recorded sound velocities ranging from 1522.24 to 1545.26 meters per second (m/s) at water depths ranging from a minimum of -0.15 m to a maximum of -10.80 m.
        Process_Date: 2024
        Source_Produced_Citation_Abbreviation: *.RAW, *.BIN, *.LOG,*.ctdx, *.ctd, *.csv, *.svp
        Process_Contact:
          Contact_Information:
            Contact_Person_Primary:
              Contact_Person: Nancy T. DeWitt
              Contact_Organization: U.S. Geological Survey
            Contact_Position: Geologist
            Contact_Address:
              Address_Type: mailing and physical address
              Address: 600 4th Street South
              City: St. Petersburg
              State_or_Province: FL
              Postal_Code: 33701-4846
              Country: USA
            Contact_Voice_Telephone: 727-502-8000
            Contact_Electronic_Mail_Address: ndewitt@usgs.gov
      Process_Step:
        Process_Description: Differentially Corrected Navigation Processing: All navigation data were acquired in WGS84 (G2296)/International Reference frame 2020 (ITRF2020) which was introduced on January 7, 2024. The survey acquisition dates occurred after this date. The latest processing software program versions were limited to WGS84 (G2139); therefore, it was the realization used for post-processing the navigation data. The base station data were post-processed through NOAA NGS OPUS, and the coordinate values were derived from the time-weighted average of values produced by OPUS. The 2024 GNSS base occupations were within +/- 3 standard deviations of the 2022-time weighted average coordinates, therefore the 2022 WGS84 (G2139) coordinates from Lyons and others (2024) were able to be used for post-processing the navigation data collected during this survey. The 2022 WGS84 (G2139) coordinates used were 29° 29' 38.33200" North, 89° 10' 29.28105" West, -25.253 m ellipsoid height, and epoch 2022.590 (BRET). To check the difference between realizations (G2139 and G2296), the BRET base station coordinates were sent through HTDP online and the resultant difference was 0.00006 latitude seconds, 0.00005 longitude seconds, and 0.00 meters ellipsoid height. The rover data, base data, and the base station coordinates were imported into GrafNav, NovAtel's Waypoint software (NovAtel, 2023). Each kinematic GNSS data session from the survey vessel was post-processed to the concurrent static base GNSS data session. GNSS data plots and data information generated by GrafNav including satellite health (satellite lock, satellite cycle slips), rover trajectory maps, and pre-processing logs were used to modify the processing parameters to attain trajectory solutions (between the base and the rover) that resulted in fixed positions. Primary examples include: 1) excluding satellites, flagged by GrafNav, with bad health or frequent cycle slips, 2) omitting satellite time segments that introduce positional errors which prevented a fixed solution, or 3) adjusting the satellite elevation mask angle to improve the position solutions (NovAtel, 2023). The final differentially corrected, precise DGPS positions were computed at 0.1s and exported as single data point epochs in ASCII text format in WGS84 (G2139) UTM 16N geodetic datum.
        Source_Used_Citation_Abbreviation: RINEX version 3.04 format files.
        Process_Date: 2025
        Source_Produced_Citation_Abbreviation: *.txt
        Process_Contact:
          Contact_Information:
            Contact_Person_Primary:
              Contact_Person: Nancy T. DeWitt
              Contact_Organization: U.S. Geological Survey
            Contact_Position: Geologist
            Contact_Address:
              Address_Type: mailing and physical address
              Address: 600 4th Street South
              City: St. Petersburg
              State_or_Province: FL
              Postal_Code: 33701-4846
              Country: USA
            Contact_Voice_Telephone: 727-502-8000
            Contact_Electronic_Mail_Address: ndewitt@usgs.gov
      Process_Step:
        Process_Description: Single-beam Bathymetry Processing: All data were processed using HYPACK® 2023 following steps outlined in the HYPACK® 2023 User Manual (Xylem, 2023). First, the HYPACK® project geodesy settings were verified, ensuring the correct UTM Zone and "K-N from User" settings with "height of ellipsoid above chart datum" value of '0.00' were selected. Next, the .RAW data files were imported into HYPACK® Single Beam Editor (64 bit). The following "Read Parameters" were selected within the Survey Tab 'Elevation Mode' and the project information was verified. Within the Corrections Tab: the sound velocity profiles (SVP) were added as .VEL format, and 'Time and Position' was selected for the SVP interpolation method. Within the Devices Tab: the vessel offsets were added and the RTK Tides box was selected. Within the Processing Tab: 'Apply Heave Correction', 'Correct Induced Heave', 'Remove Heave Drift', 'Avoid Double Heave', 'Merge Tide Data with Heave', 'Interpolate Draft', 'Apply Pitch and Roll Corrections', and 'Steer Sounding Beam' (4 degree for the TVEE, WVR1, and WVR2) were all selected. The data were then processed within HYPACK®'s Single Beam Editor (64 bit). Next, the GPS Adjustment tool was used to merge the post-processed navigation trajectory epoch solutions with their respective HYPACK® data files (.RAW). Using the Editor Profile window, these processed soundings were visually scanned for any resultant outliers which were manually removed using the editor tool. The data were then smoothed using the smoothing option with the 'number of samples for average" set to 60. Finally, the x,y,z data (easting, northing, ellipsoid height) and associated attributes (calendar date, UTC time, and line number) were exported as a single text file per line. The text files were then combined into one file per subFAN/vessel using the ArcGIS Pro 'Merge (Data Management)' geoprocessing tool, resulting in three main text files.
        Source_Used_Citation_Abbreviation: *.RAW, *.BIN, *.LOG, *.VEL, *.INI
        Process_Date: 2024
        Source_Produced_Citation_Abbreviation: 24BIM07_TVEE_PP_Merg.txt
        Source_Produced_Citation_Abbreviation: 24BIM08_WVR1_PP_Merg.txt
        Source_Produced_Citation_Abbreviation: 24BIM09_WVR2_PP_Merg.txt
        Process_Contact:
          Contact_Information:
            Contact_Person_Primary:
              Contact_Person: Nancy T. DeWitt
              Contact_Organization: U.S. Geological Survey
            Contact_Position:  Geologist
            Contact_Address:
              Address_Type: mailing and physical address
              Address: 600 4th Street South
              City: St. Petersburg
              State_or_Province: FL
              Postal_Code: 33701-4846
              Country: USA
            Contact_Voice_Telephone: 727-502-8000
            Contact_Electronic_Mail_Address: ndewitt@usgs.gov
      Process_Step:
        Process_Description: Quality Control, Quality Assurance (QA/QC) and Uncertainty Analysis: Using ArcGIS Pro, the processed single-beam datasets were then transformed into feature classes using the "Create Points From Table > XY Table to Point" geoprocessing tool and the spatial reference was set to WGS84 UTM 16N. Next, a polyline feature class (representing tracklines) was produced from the point data using XTools Pro "Make Polylines from Points" (the selection criteria being HYPACK® line name and then ordering by UTC time). Utilizing both the point and polyline feature classes, an ArcGIS Pro Python script was used to evaluate the elevation differences at the intersections of tracklines. The script does this by calculating the elevation difference between points at each intersection using an inverse distance weighting equation with a search radius of 1 m. The crossing analysis yielded a Root Mean Square Error (RMSE) of 5.44 cm for all crossings. When the TVEE crossed one of its own lines, the crossing analysis yielded an RMSE of 4.11 cm. When the WVR1 crossed one of its own lines, the crossing analysis yielded a RMSE of 4.20 cm. When the WVR2 crossed one of its own lines, the crossing analysis yielded a RMSE of 4.14 cm. When the TVEE crossed WVR1, the crossing analysis yielded and RMSE of 8.10 cm. When the TVEE crossed WVR2, the crossing analysis yielded and RMSE of 6.5 cm. When WVR1 crossed WVR2, the crossing analysis yielded an RMSE of 6.00 cm. The crossings in ArcGIS Pro were solely used as a QA/QC, not as a means of editing the data.
        Source_Used_Citation_Abbreviation: 24BIM07_TVEE_PP_Merg.txt
        Source_Used_Citation_Abbreviation: 24BIM08_WVR1_PP_Merg.txt
        Source_Used_Citation_Abbreviation: 24BIM09_WVR2_PP_Merg.txt
        Process_Date: 2025
        Source_Produced_Citation_Abbreviation: Breton_Island_SBES_2024_WGS84_G2139_xyz.txt
        Source_Produced_Citation_Abbreviation: Breton_Island_SBES_2024_WGS84_G2139_tracklines.shp
        Process_Contact:
          Contact_Information:
            Contact_Person_Primary:
              Contact_Person: Nancy T. DeWitt
              Contact_Organization: U.S. Geological Survey
            Contact_Position:  Geologist
            Contact_Address:
              Address_Type: mailing and physical address
              Address: 600 4th Street South
              City: St. Petersburg
              State_or_Province: FL
              Postal_Code: 33701-4846
              Country: USA
            Contact_Voice_Telephone: 727-502-8000
            Contact_Electronic_Mail_Address: ndewitt@usgs.gov
      Process_Step:
        Process_Description: Datum Transformation: NOAA NGS's VDatum software was used to transform the single-beam data points' horizontal (x,y) and vertical (z) datums from WGS84 (G2139) UTM 16N (horizontal), WGS84 (G2139) ellipsoid height (vertical) using epoch year 2024.596 (start of the survey) to NAD83 UTM 16N (horizontal), NAVD88 orthometric height (vertical) using GEOID18 epoch year 2010.000 (the reference epoch for the NAD83[2011] realization). The VDatum-reported vertical uncertainty is 0.045 m. For more information about the positional accuracy for these datum transformations, visit the Estimation of Vertical Uncertainties VDatum webpage, https://vdatum.noaa.gov/docs/est_uncertainties.html.
        Source_Used_Citation_Abbreviation: Breton_Island_SBES_2024_WGS84_G2139_xyz.txt
        Process_Date: 2025
        Source_Produced_Citation_Abbreviation: Breton_Island_2024_SBES_NAD83_NAVD88_UTM16N_GEOID18_xyz.txt
        Process_Contact:
          Contact_Information:
            Contact_Person_Primary:
              Contact_Person: Nancy T. DeWitt
              Contact_Organization: U.S. Geological Survey
            Contact_Position:  Geologist
            Contact_Address:
              Address_Type: mailing and physical address
              Address: 600 4th Street South
              City: St. Petersburg
              State_or_Province: FL
              Postal_Code: 33701-4846
              Country: USA
            Contact_Voice_Telephone: 727-502-8000
            Contact_Electronic_Mail_Address: ndewitt@usgs.gov
  Spatial_Data_Organization_Information:
    Direct_Spatial_Reference_Method: Point
    Point_and_Vector_Object_Information:
      SDTS_Terms_Description:
        SDTS_Point_and_Vector_Object_Type: Point
        Point_and_Vector_Object_Count: 3,877,228
  Spatial_Reference_Information:
    Horizontal_Coordinate_System_Definition:
      Planar:
        Grid_Coordinate_System:
          Grid_Coordinate_System_Name: Universal Transverse Mercator
          Universal_Transverse_Mercator:
            UTM_Zone_Number: 16N
            Transverse_Mercator:
              Scale_Factor_at_Central_Meridian: 0.999600
              Longitude_of_Central_Meridian: -87.000000
              Latitude_of_Projection_Origin: 0.000000
              False_Easting: 500000.000000
              False_Northing: 0.000000
        Planar_Coordinate_Information:
          Planar_Coordinate_Encoding_Method: coordinate pair
          Coordinate_Representation:
            Abscissa_Resolution: 0.6096
            Ordinate_Resolution: 0.6096
          Planar_Distance_Units: meters
      Geodetic_Model:
        Horizontal_Datum_Name: World Geodetic System of 1984
        Ellipsoid_Name: WGS_1984
        Semi-major_Axis: 6378137.000000
        Denominator_of_Flattening_Ratio: 298.257223563
    Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
        Altitude_Datum_Name: World Geodetic System of 1984
        Altitude_Resolution: 0.01
        Altitude_Distance_Units: meters
        Altitude_Encoding_Method: Attribute values
  Entity_and_Attribute_Information:
    Detailed_Description:
      Entity_Type:
        Entity_Type_Label: Breton_2024_SBES_WGS84_UTM16N_xyz.txt
        Entity_Type_Definition: Comma-delimited ASCII text file (.txt) containing the processed single-beam bathymetry data points from USGS FAN 2024-320-FA (subFANs 24BIM07, 24BIM08, and 24BIM09). Data are in the processing datum WGS84 (G2139) UTM Zone 16N.
        Entity_Type_Definition_Source: U.S. Geological Survey
      Attribute:
        Attribute_Label: X_EASTING_WGS84(G2139)
        Attribute_Definition: x-axis coordinate, easting, WGS84 (G2139) UTM 16N.
        Attribute_Definition_Source: U.S. Geological Survey
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 283047.57
            Range_Domain_Maximum: 296933.17
            Attribute_Units_of_Measure: meters
      Attribute:
        Attribute_Label: Y_NORTHING_WGS84(G2139)
        Attribute_Definition: y-axis coordinate, northing, WGS84 (G2139) UTM 16N.
        Attribute_Definition_Source: U.S. Geological Survey
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 3256790.92
            Range_Domain_Maximum: 3269200.21
            Attribute_Units_of_Measure: meters
      Attribute:
        Attribute_Label: ELLIPSOID_WGS84(G2139)
        Attribute_Definition: z-value, ellipsoid height (elevation), WGS84 UTM16N.
        Attribute_Definition_Source: U.S. Geological Survey
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: -37.25
            Range_Domain_Maximum: -25.82
            Attribute_Units_of_Measure: meters
      Attribute:
        Attribute_Label: YEAR
        Attribute_Definition: Year (YYYY) of data acquisition.
        Attribute_Definition_Source: U.S. Geological Survey
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 2024
            Range_Domain_Maximum: 2024
      Attribute:
        Attribute_Label: DOY
        Attribute_Definition: Day of year of data acquisition.
        Attribute_Definition_Source: U.S. Geological Survey
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 219
            Range_Domain_Maximum: 223
      Attribute:
        Attribute_Label: UTC_TIME
        Attribute_Definition: Universe Coordinate Time (UTC) of data acquisition.
        Attribute_Definition_Source: U.S. Geological Survey
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 13:42:29.620
            Range_Domain_Maximum: 23:01:02.081
            Attribute_Units_of_Measure: HH:MM:SS.sss
      Attribute:
        Attribute_Label: HYPACK_LINE
        Attribute_Definition: Identifier assigned to each HYPACK® line during acquisition.
        Attribute_Definition_Source: HYPACK®/U.S. Geological Survey
        Attribute_Domain_Values:
          Unrepresentable_Domain: Line name example 24BIM08_WVR1_0034_2002, where the first 7 characters are the subFAN followed by underscore (24BIM08_), the next 4 characters are the platform/vessel followed by an underscore (WVR1_), and the last 9 characters are the HYPACK® line number and start time (HHMM) in UTC separated by and underscore (0034_2002). If the same line name had multiple segments a 4-digit number was appended after the line number (for example, _0001).
    Detailed_Description:
      Entity_Type:
        Entity_Type_Label: Breton_Island_2024_SBES_NAD83_NAVD88_UTM16N_GEOID18_xyz.txt
        Entity_Type_Definition: Comma-delimited ASCII text file (.txt) containing the processed single-beam bathymetry data points from USGS FAN 2024-320-FA (subFANs 24BIM07, 24BIM08, and 24BIM09). Data were transformed from its native datum to NAD83 NAVD88 UTM Zone 16 North coordinate system with respect to the GEOID 18 datum.
        Entity_Type_Definition_Source: VDatum
      Attribute:
        Attribute_Label: X_EASTING_NAD83(2011)
        Attribute_Definition: x-axis coordinate, easting, NAD83 (2011) UTM 16N.
        Attribute_Definition_Source: VDatum
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 283048.452
            Range_Domain_Maximum: 296934.049
            Attribute_Units_of_Measure: meters
      Attribute:
        Attribute_Label: Y_NORTHING_NAD83(2011)
        Attribute_Definition: y-axis coordinate, northing, NAD83 (2011) UTM 16N.
        Attribute_Definition_Source: VDatum
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 3256790.354
            Range_Domain_Maximum: 3269199.64
            Attribute_Units_of_Measure: meters
      Attribute:
        Attribute_Label: ORTHOMETRIC_NAVD88_GEOID18
        Attribute_Definition: z-value, orthometric height adjusted (elevation) in NAVD88 GEOID 18.
        Attribute_Definition_Source: VDatum
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: -11.457
            Range_Domain_Maximum: -0.085
            Attribute_Units_of_Measure: meters
      Attribute:
        Attribute_Label: YEAR
        Attribute_Definition: Year (YYYY) of data acquisition.
        Attribute_Definition_Source: U.S. Geological Survey
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 2024
            Range_Domain_Maximum: 2024
      Attribute:   
        Attribute_Label: DOY
        Attribute_Definition: Day of year of data acquisition.
        Attribute_Definition_Source: U.S. Geological Survey
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 219
            Range_Domain_Maximum: 223
      Attribute:
        Attribute_Label: UTC_TIME
        Attribute_Definition: Universe Coordinate Time (UTC) of data acquisition.
        Attribute_Definition_Source: U.S. Geological Survey
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 13:42:29.620
            Range_Domain_Maximum: 23:01:02.081
            Attribute_Units_of_Measure: HH:MM:SS.s
      Attribute:
        Attribute_Label: HYPACK_LINE
        Attribute_Definition: Identifier assigned to each HYPACK® line during acquisition.
        Attribute_Definition_Source: HYPACK®/U.S. Geological Survey
        Attribute_Domain_Values:
          Unrepresentable_Domain: Line name example 24BIM08_WVR1_0034_2002, where the first 7 characters are the subFAN followed by underscore (24BIM08_), the next 4 characters are the platform/vessel followed by an underscore (WVR1_), and the last 9 characters are the HYPACK® line number and start time (HHMM) in UTC separated by and underscore (0034_2002). If the same line name had multiple segments a 4-digit number was appended after the line number (for example, _0001).
    Detailed_Description:
      Entity_Type:
        Entity_Type_Label: Breton_Island_SBES_2024_WGS84_Tracklines.shp
        Entity_Type_Definition: Polyline shapefile of the single-beam bathymetry tracklines (222 lines in total).
        Entity_Type_Definition_Source: U.S. Geological Survey
      Attribute:
        Attribute_Label: FID
        Attribute_Definition: Automatically generated feature attribute by Esri.
        Attribute_Definition_Source: Esri
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 1
            Range_Domain_Maximum: 222
      Attribute:
        Attribute_Label: Shape
        Attribute_Definition: Automatically generated feature attribute by Esri.
        Attribute_Definition_Source: Esri
        Attribute_Domain_Values:
          Unrepresentable_Domain: Polyline ZM
      Attribute:
        Attribute_Label: Shape_Leng
        Attribute_Definition: Length of the trackline polyline, in meters.
        Attribute_Definition_Source: Esri
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 6.69
            Range_Domain_Maximum: 8264.36
            Attribute_Units_of_Measure: meters
      Attribute:
        Attribute_Label: HYPACK_line
        Attribute_Definition: Identifier assigned to each HYPACK® line during acquisition.
        Attribute_Definition_Source: HYPACK®/U.S. Geological Survey
        Attribute_Domain_Values:
          Unrepresentable_Domain: Line name example 24BIM08_WVR1_0034_2002, where the first 7 characters are the subFAN followed by underscore (24BIM08_), the next 4 characters are the platform/vessel followed by an underscore (WVR1_), and the last 9 characters are the HYPACK® line number and start time (HHMM) in UTC (0034_2002). If the same line name had multiple segments a 4-digit number was appended after the line number (for example, _0001).
  Distribution_Information:
    Distributor:
      Contact_Information:
        Contact_Organization_Primary:
          Contact_Organization: U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
          Contact_Person: USGS SPCMSC Data Management
        Contact_Address:
          Address_Type: mailing and physical
          Address: 600 4th Street South
          City: Saint Petersburg
          State_or_Province: FL
          Postal_Code: 33701-4846
          Country: United States
        Contact_Voice_Telephone: 727-502-8000
        Contact_Electronic_Mail_Address: gs-g-spcmsc_data_inquiries@usgs.gov
    Resource_Description: Breton_Island_2024_SBES_WGS84_UTM16N_xyz.txt, Breton_Island_2024_SBES_NAD83_NAVD88_UTM16N_GEOID18_xyz.txt, Breton_Island_SBES_2024_WGS84_UTM16N_Tracklines.shp
    Distribution_Liability: 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 for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
    Standard_Order_Process:
      Digital_Form:
        Digital_Transfer_Information:
          Format_Name: comma-delimited text, shapefile
          File_Decompression_Technique: ZIP
        Digital_Transfer_Option:
          Online_Option:
            Computer_Contact_Information:
              Network_Address:
                Network_Resource_Name: https://coastal.er.usgs.gov/data-release/doi-P14M8EZU/data/Breton_Island_2024_SBES_WGS84_UTM16N_xyz.zip
                Network_Resource_Name: https://coastal.er.usgs.gov/data-release/doi-P14M8EZU/data/Breton_Island_2024_SBES_NAD83_NAVD88_UTM16N_GEOID18_xyz.zip
                Network_Resource_Name: https://coastal.er.usgs.gov/data-release/doi-P14M8EZU/data/Breton_Island_SBES_2024_WGS84_UTM16N_tracklines.zip
      Fees: None
  Metadata_Reference_Information:
    Metadata_Date: 20260423
    Metadata_Contact:
      Contact_Information:
        Contact_Organization_Primary:
          Contact_Organization: U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
          Contact_Person: USGS SPCMSC Data Management
        Contact_Address:
          Address_Type: mailing and physical
          Address: 600 4th Street South
          City: Saint Petersburg
          State_or_Province: FL
          Postal_Code: 33701-4846
          Country: United States
        Contact_Voice_Telephone: 727-502-8000
        Contact_Electronic_Mail_Address: gs-g-spcmsc_data_inquiries@usgs.gov
    Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
    Metadata_Standard_Version: FGDC-STD-001-1998
