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