Metadata:
  Identification_Information:
    Citation:
      Citation_Information:
        Originator: Christopher C. Bemelmans
        Originator: Nancy T. DeWitt
        Originator: Jenna A. Brown
        Publication_Date: 20260424
        Title: Coastal Single-beam Bathymetry Data Collected in 2025 From Milton Pass, Florida
        Geospatial_Data_Presentation_Form: tabular, vector, and raster digital data
        Larger_Work_Citation:
          Citation_Information:
            Originator: Christopher C. Bemelmans
            Originator: Nancy T. DeWitt
            Originator: Jenna A. Brown
            Publication_Date: 20260424
            Title: Coastal Single-Beam Bathymetry Data: Midnight Pass and Milton Pass, Florida, June 2025
            Series_Information:
              Series_Name: U.S. Geological Survey data release
              Issue_Identification: doi:10.5066/P13I93P7
            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/P13I93P7
    Description: 
      Abstract: In June 2025, the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center (USGS SPCMSC) participated in a multidisciplinary geoscientific field data collection at Midnight Pass and Milton Pass located along Florida's west-central coastline. These inlets were opened as a result of hurricanes Helene and Milton in 2024. Researchers with the Nearshore Extreme Events Reconnaissance Association (NEER, https://neerassociation.org/) conducted surveys of these inlets immediately following Hurricane Milton in 2024, and this data collected in 2025 is to support the continued monitoring of the evolution of the inlets (Stark and others, 2025). This metadata record describes the single-beam bathymetry surveys conducted by USGS SPCMSC at Milton Pass, Florida on June 26, 2025, under the USGS Field Activity Number (FAN) 2025-313-FA. The survey area encompassed the nearshore environment, the inlet, and the back bay waterway resulting in 3.41 square kilometers (km2) coverage at Milton Pass. The single-beam bathymetry was acquired using two 12-foot personal watercrafts (PWC), outfitted with high precision Global Navigation Satellite System (GNSS) receivers, motion reference units, and survey-grade single-beam echosounders (SBES). This data release provides point data (x, y, z) in two datums: 1) World Geodetic System 1984 (WGS84) realization G2296, Universal Transverse Mercator (UTM) zone 17 North (N) for the horizontal and WGS84 (G2296) ellipsoidal height in meters for the vertical; and 2) North American Datum of 1983 (NAD83) realization of 2011 for the horizontal, and North American Vertical Datum 1988 (NAVD88) orthometric height in meters with respect to GEOID18 for the vertical. Additional files include single-beam trackline shapefiles (.shp). For further information regarding data collection and/or processing steps, please see the metadata associated with this data release.
      Purpose: Following the 2024 hurricane season, the USGS SPCMSC conducted a single-beam bathymetric survey within and around the vicinity of Milton Pass as part of a comprehensive project in collaboration with academic institutions and federal agencies. A variety of techniques were applied to investigate the geomorphology of these areas, aiming to enhance understanding of how breach sites evolve following hurricane events. The primary goal of this cooperative effort was to consolidate, organize, and disseminate the field-collected data, ultimately resulting in a detailed and robust dataset. These data will guide forthcoming publication initiatives. Updates regarding publications will be communicated as they become available. 
      Supplemental_Information: Single-beam data and associated files were collected during USGS Field Activity Number (FAN) 2024-313-FA. Research Vessel (R/V) specific single-beam bathymetry echosounder data (SBES) were assigned subFANs; 25BIM03 (R/V Shark - WVR1) and 25BIM04 (R/V Chum - WVR2). This metadata file supports the Milton Pass dataset collected on 06/26/2025, day of year 177. 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=2025-313-FA. 
    Time_Period_of_Content:
      Time_Period_Information:
        Single_Date/Time:
          Calendar_Date: 20250626
      Currentness_Reference: ground condition
    Status:
      Progress: Complete
      Maintenance_and_Update_Frequency: None planned
    Spatial_Domain:
      Bounding_Coordinates:
        West_Bounding_Coordinate: -82.3561454
        East_Bounding_Coordinate: -82.3473990 
        North_Bounding_Coordinate: 26.9109874
        South_Bounding_Coordinate: 26.9030733
    Keywords:
      Theme:
        Theme_Keyword_Thesaurus: USGS Metadata Identifier
        Theme_Keyword: USGS:d421fff5-b753-4f8b-af40-72d1a7a28f2b
      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: PROVIDERS > 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_Keyword: digital elevation models
        Theme_Keyword: hurricanes
      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: Geographic Names Information System (GNIS)
        Place_Keyword: State of Florida
        Place_Keyword: Gulf of America
      Place:
        Place_Keyword_Thesaurus: None
        Place_Keyword: Milton Pass
        Place_Keyword: Stump Pass Beach State Park
        Place_Keyword: Gulf of Mexico
        Place_Keyword: Mid-Gulf Coast
      Temporal:
        Temporal_Keyword_Thesaurus: None
        Temporal_Keyword: 2025
    Access_Constraints: No access constraints. Please see 'Distribution Information' for details. 
    Use_Constraints: These data are marked with a Creative Commons CC0 1.0 Universal License. These data are in the public domain and do not have any use constraints.
    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 coastal assessment component of the Consolidated Appropriations Act Title VII, Division N: Disaster Relief Supplemental Appropriations Act, 2023 (Public Law 117-328). The authors would like to thank members of the USGS SPCMSC Operations staff, specifically Kyle W. Kelso and Benjamin A. Galbraith for their bathymetry acquisition field support as well as Emily L. Johnson for additional field and land support. This document was improved by scientific/editorial and metadata reviews from Billy J. Reynolds 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; 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 23.3.4.0; Environmental Systems Research Institute (Esri) ArcGIS Pro version 3.3.2; National Oceanic and Atmospheric Administration (NOAA) and the National Geodetic Survey (NGS) VDatum software version 4.7.1 (https://vdatum.noaa.gov/).
    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: Nina Stark
        Originator: Michael Gardner
        Originator: Michael Grilliot
        Originator: Andrew Lyda
        Originator: Karen Dedinsky
        Originator: Jaquelin Mueller
        Originator: Charli Pezoldt
        Originator: Johnathan Hubler
        Originator: Celso Castro-Bolinaga
        Originator: Alexander Schueller
        Originator: Weiwei Zhan
        Originator: Michael Haefeli
        Originator: Sarah Burghardt
        Originator: Maxwell Wondolowski
        Originator: Sam Holberg
        Originator: Mohamed Hassan
        Originator: Jack Parker
        Originator: Jorge Laurel-Castillo
        Originator: Lea Eggensberger
        Originator: Elliot Nichols
        Originator: Hanna Herndon
        Originator: Ping Wang
        Originator: Maitane Olabarrieta Lizaso
        Originator: Brit Raubenheimer
        Originator: Youssef Hashash
        Originator: Stephen Adusei
        Originator: Navid Jafari
        Publication_Date: 20250130
        Title: NEER/GEER: Hurricanes Helene & Milton Dataset
        Series_Information:
          Series_Name: Multidisciplinary Pre, During and Post Storm Data Collection
          Issue_Identification: doi:10.17603/ds2-m8h3-5802
        Publication_Information:
          Publication_Place: DesignSafe-CI
          Publisher: U.S. National Science Foundation Natural Hazards Engineering Research Infrastructure (NSF NHERI)
        Online_Linkage: https://doi.org/10.17603/ds2-m8h3-5802
  Data_Quality_Information:
    Attribute_Accuracy:
      Attribute_Accuracy_Report: This dataset is derived from a single survey using two vessels with identical equipment systems and acquisition settings. Prior to deployment, each vessel's equipment offsets were surveyed using a Geotronics/Spectra Precision Geodimeter® 640 total station equipped with an electronic theodolite and an electronic distance meter. 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 from the Florida Department of Transportation (FDOT) Florida Permanent Reference Network (FPRN) datasheets for the Continuously Operating Reference Stations (CORS) used to process the navigation data. Roving vessels remained within < 10-km of the CORS base station. The navigation positioning data were post processed using NovAtel®'s Waypoint Software GrafNav.
    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 June 2025 within and around Milton Pass, Florida. The horizontal positions and vertical elevations are provided in two datums, 1) WGS84 (G2296) and ellipsoid height, and 2) NAD83(2011) NAVD88 UTM 17N 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 FDOT FPRN CORS station Sarasota South, code name FLSS (NGS PID DR9091), was used for the local control, and the coordinate values were obtained from FPRN's FLSS datasheet (https://www.myfloridagps.com/sc/flss.pdf). The maximum horizontal surface vector distance from the base station to both roving vessels was 9.87 km. 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 average post-processed horizontal standard deviation accuracy (2-sigma) for all kinematic rover data processed to FLSS CORS station was 0.013 +/- 0.001 meters (m).
      Vertical_Positional_Accuracy:
        Vertical_Positional_Accuracy_Report: The FDOT FPRN CORS station Sarasota South, code name FLSS (NGS PID DR9091), was used for the local control, and the coordinate values were obtained from FPRN's FLSS datasheet. The vertical position accuracy associated with each data point was determined by post-processed differential correction of the base/rover GNSS sessions using GrafNav. The average post-processed vertical standard deviation accuracy (2-sigma) for all kinematic rover data processed to the FLSS CORS station was 0.002 +/- 0.005 m.
    Lineage:
      Process_Step:
        Process_Description: GNSS Acquisition: As reported on the FPRN FLSS CORS station datasheet, the base station was equipped with a Leica Geosystems® GR50 GNSS receiver using a Leiar20 SCIT antenna recording at a rate of 1.0 seconds (s) equal to 1 hertz (Hz). The roving vessels were each equipped with a Spectra Precision® SP90M GNSS receiver using Spectra Precision® SPGA Rover GNSS antennae recording full-carrier-phase positioning signals from satellites at a rate of 0.1 s, or 10 Hz. Post-survey, the base station data files were downloaded from the FDOT FPRN online server location in the non-proprietary Receiver Independent Exchange Format (RINEX [https://igs.org/wg/Rinex/]) format version 3.04 (e.g. FLSC17700.250). The proprietary Spectra Precision® G-files (e.g. GWVR1A24.177) from the rovers were converted into RINEX format version 3.04 (e.g. WVR100000_R_20251772001_02H_10Z_MO) which converts all the satellite constellations tracked by the antenna (GPS, GLONASS, Bideau, and Galileo). Example of the RINEX 3.04 filename is FLSC177l00.25O, where the convention FLSC is the four-letter site name, 177 is the day of year, I is the session A-Z, 00 is the time, 25 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. Example of the RINEX 3.04 filename WVR100000_R_20251762001_02H_10Z_MO where the convention WVR100000 is the nine-letter site name, R is the data source (R - receiver), 20251772001 is the year (2025), day of year (177), and Coordinated Universal Time (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: 2025
        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 37.50 line-km of SBES data were collected as part of FAN 2025-313-FA: the R/V Shark (WVR1 - subFAN 25BIM03) collected 21.13 line-km, and R/V Chum (WVR2 - subFAN 245BIM04) collected 16.37 line-km of data. Boat motion (heave, roll, pitch) was recorded on each vessel at 50-millisecond (ms) intervals using a SBG Systems® Ellipse Series A motion sensor. 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 an Teledyne® Odom Echotrac CV100 echosounder with a 4-degree, 200-kilohertz (kHz) transducer on 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 UTC. Sound velocity profile (SVP) measurements were collected using SonTek Castaway® Conductivity, Temperature, and Depth (CTD) instruments. The CTD units were cast overboard to record changes in water column speed of sound (SOS) spatially and temporally. A total of 6 casts recorded sound velocities ranging from 1547.90 to 1548.88 meters per second (m/s) at water depths ranging from a minimum of -0.15 m to a maximum of -6.62 m.
        Process_Date: 2025
        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 Terrestrial Reference Frame of 2020 (ITRF2020). The FLSS coordinates used for post-processing the navigation collected during this survey were 26° 59' 24.69514" North, 82° 22' 22.61898" West, -19.679 m ellipsoid height, and epoch 2025.0073 obtained from the FPRN FLSS datasheet (https://www.myfloridagps.com/ds/pdfs/flss.pdf). The rover data, base data, and the base station coordinates were imported into GrafNav (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 a single data point epochs in ASCII text format (.txt) in WGS84 (G2296) UTM Zone 17N 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 was 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 them combined into one file per subFAN/vessel using the Esri ArcGIS Pro "Merge (Data Management)" geoprocessing tool, resulting in two main text files.
        Source_Used_Citation_Abbreviation: *.RAW, *.BIN, *.LOG, *.VEL
        Process_Date: 2025
        Source_Produced_Citation_Abbreviation: 25BIM03_WVR1_PP_Merge.txt
        Source_Produced_Citation_Abbreviation: 25BIM04_WVR2_PP_Merge.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 17N. 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 5.80 cm for all crossings. When the WVR1 crossed one of its own lines, the crossing analysis yielded an RMSE of 4.80 centimeters (cm). When the WVR2 crossed one of its own lines, the crossing analysis yielded an RMSE of 6.80 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: 25BIM03_WVR1_PP_Merge.txt
        Source_Used_Citation_Abbreviation: 25BIM04_WVR2_PP_Merge.txt
        Process_Date: 2025
        Source_Produced_Citation_Abbreviation: Milton_Pass_2025_SBES_WGS84_G2296_UTM17N_xyz.txt
        Source_Produced_Citation_Abbreviation: Milton_Pass_2025_SBES_WGS84_G2296_UTM17N_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 (G2296) UTM 17N (horizontal), WGS84 (G2296) ellipsoid height (vertical) using epoch year 2025.482 (start of the survey) to NAD83 UTM 17N (horizontal), NAVD88 orthometric height (vertical) using GEOID18 epoch year 2010.000. The VDatum-reported vertical uncertainty is 0.033 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: Milton_Pass_2025_SBES_WGS84_G2296_UTM17N_xyz.txt
        Process_Date: 2025
        Source_Produced_Citation_Abbreviation: Milton_Pass_2025_SBES_NAD83_NAVD88_GEOID18_UTM17N_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
      Process_Step:
        Process_Description: Digital Elevation Model (DEM) Creation: Using ArcGIS Pro version 3.2.3 and the single-beam point data file (Milton_Pass_2025_SBES_WGS84_G2296_UTM17N_xyz.txt), a 1 x 1-m cell resolution DEM was generated using ArcGIS geoprocessing tools. First, a polygon feature class was created using "Create Feature Class (Data Management)" tool and was shaped to the single-beam data file extent using ArcGIS Pro "Edit Vertices" tool. This polygon feature class was then converted to a 1 X 1-m cell size raster using the "Feature to Raster (Conversion)" tool. Second, using the single-beam point data file (Milton_Pass_2025_SBES_WGS84_G2296_UTM17N_xyz.txt), a 1-m DEM was generated using the "Natural Neighbors (Spatial Analyst)" tool. Third, the DEM was clipped to the 1-m raster (created in the first step) using the "Extract by Mask (Spatial Analyst)" tool. The computation results produced minimum and maximum ellipsoid height values of -25.49 to -32.46, which closely resemble the single beam point data values of -25.47 to -32.46. Last, to quantify how closely the 1-m DEM represents the single-beam point data, the "Extract Values to Points (Spatial Analyst)" tool was used. This tool extracts the value from the DEM at each single-beam data point location. The 1-m DEM represented 332,216 of 333,109 with 893 (0.27%) reported as null values. Using the generated feature class and associated attribute table, the RMSE was calculated as 0.021 m. The DEM was then exported as a Geographic Tag Image File Format (GeoTIFF, .tif) file with the symbology set to stretch.
        Source_Used_Citation_Abbreviation: Milton_Pass_2025_SBES_WGS84_G2296_UTM17N_xyz.txt
        Process_Date: 2025
        Source_Produced_Citation_Abbreviation: Milton _Pass_2025_SBES_1m_DEM_WGS84_G2296_UTM17N.tif
        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: 333,109
  Spatial_Reference_Information:
    Horizontal_Coordinate_System_Definition:
      Planar:
        Grid_Coordinate_System:
          Grid_Coordinate_System_Name: Universal Transverse Mercator
          Universal_Transverse_Mercator:
            UTM_Zone_Number: 17N
            Transverse_Mercator:
              Scale_Factor_at_Central_Meridian: 0.999600
              Longitude_of_Central_Meridian: -81.000000
              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: Milton_Pass_2025_SBES_WGS84_G2296_UTM17N_xyz.txt
        Entity_Type_Definition: Comma-delimited ASCII text file (.txt) containing the processed single-beam bathymetry data points from USGS FAN 2025-313-FA (subFANs 25BIM03 and 25BIM04). Data is projected to the processing datum WGS84 (G2296) UTM Zone 17N.
        Entity_Type_Definition_Source: U.S. Geological Survey
      Attribute:
        Attribute_Label: X_EASTING_WGS84(G2296)
        Attribute_Definition: x-axis coordinate, easting, WGS84 (G2296) UTM 17N.
        Attribute_Definition_Source: U.S. Geological Survey
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 365336.43
            Range_Domain_Maximum: 366195.89
            Attribute_Units_of_Measure: meters
      Attribute:
        Attribute_Label: Y_NORTHING_WGS84(G2296)
        Attribute_Definition: y-axis coordinate, northing, WGS84 (G2296) UTM 17N.
        Attribute_Definition_Source: U.S. Geological Survey
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 2976420.95
            Range_Domain_Maximum: 2977288.56
            Attribute_Units_of_Measure: meters
      Attribute:
        Attribute_Label: ELLIPSOID_WGS84(G2296)
        Attribute_Definition: z-value, ellipsoid height (elevation), WGS84(G2296) UTM17N.
        Attribute_Definition_Source: U.S. Geological Survey
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: -32.46
            Range_Domain_Maximum: -25.47
            Attribute_Units_of_Measure: meters
      Attribute:
        Attribute_Label: YEAR
        Attribute_Definition: Day of year of data acquisition.
        Attribute_Definition_Source: U.S. Geological Survey
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 2025
            Range_Domain_Maximum: 2025
      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: 177
            Range_Domain_Maximum: 177
      Attribute:
        Attribute_Label: DATE
        Attribute_Definition: Day of year of data acquisition.
        Attribute_Definition_Source: U.S. Geological Survey
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 6/26/2025
            Range_Domain_Maximum: 6/26/2025      
      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: 13:31:24.142
            Range_Domain_Maximum: 16:41:35.877
            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 25BIM03_WVR1_0011_1732, where the first 7 characters are the subFAN followed by underscore (25BIM03_), the next 4 characters are the platform/vessel separated by an underscore (WVR1_), and the last 9 characters are the HYPACK® line number and start time (HHMM) in UTC separated by an underscore (0011_1732). 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: Milton_Pass_2025_SBES_NAD83_NAVD88_GEOID18_UTM17N_xyz.txt
        Entity_Type_Definition: Comma-delimited ASCII text file (.txt) containing the processed single-beam bathymetry data points from USGS FAN 2025-313-FA (subFANs 25BIM03 and 25BIM04). Data were transformed from its processed datum to NAD83 NAVD88 UTM Zone 17N 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 17N.
        Attribute_Definition_Source: VDatum
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 365337.105
            Range_Domain_Maximum: 366196.565
            Attribute_Units_of_Measure: meters
      Attribute:
        Attribute_Label: Y_NORTHING_NAD83(2011)
        Attribute_Definition: y-axis coordinate, northing, NAD83 (2011) UTM 17N.
        Attribute_Definition_Source: VDatum
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 2976420.363
            Range_Domain_Maximum: 2977287.973
            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: -7.069
            Range_Domain_Maximum: -0.082
            Attribute_Units_of_Measure: meters
      Attribute:
        Attribute_Label: YEAR
        Attribute_Definition: Year of data acquisition.
        Attribute_Definition_Source: U.S. Geological Survey
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 2025
            Range_Domain_Maximum: 2025
      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: 177
            Range_Domain_Maximum: 177
      Attribute:
        Attribute_Label: Date
        Attribute_Definition: Calendar date of data acquisition.
        Attribute_Definition_Source: U.S. Geological Survey
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 6/26/2025
            Range_Domain_Maximum: 6/26/2025
      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: 13:31:24.142
            Range_Domain_Maximum: 16:41:35.877
            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 25BIM03_WVR1_0011_1732, where the first 7 characters are the subFAN followed by underscore (25BIM03_), the next 4 characters are the platform/vessel separated by an underscore (WVR1_), and the last 9 characters are the HYPACK® line number and start time (HHMM) in UTC separated by an underscore (0011_1732). 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: Milton_Pass_2025_SBES_WGS84_G2296_UTM17N_tracklines.shp
        Entity_Type_Definition: Polyline shapefile of the single-beam bathymetry tracklines (135 tracklines in total).
        Entity_Type_Definition_Source: Esri
      Attribute:
        Attribute_Label: FID
        Attribute_Definition: Automatically generated feature attribute by Esri.
        Attribute_Definition_Source: U.S. Geological Survey
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 0
            Range_Domain_Maximum: 134
      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_Length
        Attribute_Definition: Length of the trackline polyline, in meters.
        Attribute_Definition_Source: Esri
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 67.27
            Range_Domain_Maximum: 819.83
            Attribute_Units_of_Measure: meters
      Attribute:
        Attribute_Label: HYPACK_Lin
        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 25BIM03_WVR1_0011_1732, where the first 7 characters are the subFAN followed by underscore (25BIM03_), the next 4 characters are the platform/vessel separated by an underscore (WVR1_), and the last 9 characters are the HYPACK® line number and start time (HHMM) in UTC separated by an underscore (0011_1732). If the same line name had multiple segments a 4-digit number was appended after the line number (for example, _0001).
    Overview_Description:
      Entity_and_Attribute_Overview:
        Milton_Pass_2025_SBES_1m_DEM_WGS84_G2296_UTM17N.tif: A 1-m cell size gridded DEM GeoTIFF (.tif) created from the x,y,z point dataset in this data release (Milton_Pass_2025_SBES_WGS84_G2296_UTM17N_xyz.txt). The ellipsoid elevation ranges from -25.49 to -32.46 m and is projected in WGS84 (G2296) UTM 17N. The file format is 32-bit floating point GeoTIFF with 860 columns, 868 rows.
      Entity_and_Attribute_Detail_Citation: The entity and attribute information were generated by the individual and/or agency identified as the originator of the dataset. Please review the rest of the metadata record for additional details and information.
  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
          Country: United States
        Contact_Voice_Telephone: 727-502-8000
        Contact_Electronic_Mail_Address: gs-g-spcmsc_data_inquiries@usgs.gov
    Resource_Description: Milton_Pass_2025_SBES_WGS84_G2296_UTM17N_xyz.txt, Milton_Pass_2025_SBES_NAD83_NAVD88_GEOID18_UTM17N_xyz.txt, Milton_Pass_2025_SBES_1m_DEM_WGS84_G2296_UTM17N.tif, Milton_Pass_2025_SBES_WGS84_G2296_UTM17N_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-P13I93P7/data/Milton_Pass_2025_SBES_WGS84_G2296_UTM17N_xyz.zip
                Network_Resource_Name: https://coastal.er.usgs.gov/data-release/doi-P13I93P7/data/Milton_Pass_2025_SBES_NAD83_NAVD88_GEOID18_UTM17N_xyz.zip
                Network_Resource_Name: https://coastal.er.usgs.gov/data-release/doi-P13I93P7/data/Milton_Pass_2025_SBES_WGS84_G2296_UTM17N_tracklines.zip
                Network_Resource_Name: https://coastal.er.usgs.gov/data-release/doi-P13I93P7/data/Milton_Pass_2025_SBES_1m_DEM_WGS84_G2296_UTM17N.zip
      Fees: None
  Metadata_Reference_Information:
    Metadata_Date: 20260424
    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
          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
