Chelsea A. Stalk Nancy T. DeWitt Sabrina C. Levinson Jennifer L. Miselis 20240401 raster digital data, tabular digital data Chelsea A. Stalk Nancy T. DeWit Sabrina C. Levinson Jennifer L. Miselis 20240401 U.S. Geological Survey data release doi:10.5066/P13TUAJH St. Petersburg, Florida U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center https://doi.org/10.5066/P13TUAJH An Ellipsoidally Referenced Survey (ERS) using two Teledyne Reson SeaBat T50-P multibeam echosounders, in dual-head configuration, was conducted by the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center (SPCMSC) covering the nearshore extent of Seven Mile Island, New Jersey (NJ), from May 18-27, 2023. The download file, 7Mile_2023_MBES_xyz.zip, includes processed elevation point data (x,y,z), as derived from a 1-meter (m) bathymetric grid. The download file, 7Mile_2023_MBES_Backscatter.zip, includes acoustic backscatter intensity data in 32-bit floating point GeoTIFF (Geographic Tagged Image File Format, .tif f) format. The purpose of the survey was to collect high-density multibeam bathymetry data nearshore of the Seven Mile Island, New Jersey to better evaluate shoreface morphology. Data were collected during USGS Field Activity Number (FAN) 2023-319-FA. Additional survey and data details are available from the USGS Coastal and Marine Geoscience Data System (CMGDS) at, https://cmgds.marine.usgs.gov/fan_info.php?fan=2023-319-FA. The processed sonar data are provided as American Standard Code for Information Interchange (ASCII) x,y,z point data files, and 32-bit floating point GeoTIFF (.tiff) raster format. These values are not the individual soundings, but nodes from a 1-m bathymetric grid. The Z value for the node is generated by utilizing a Combined Uncertainty and Bathymetry Estimator (CUBE) surface and has an estimated total value of uncertainty (Calder and Wells, 2007). The bathymetry data were collected and processed in the World Geodetic System of 1984 (WGS84) vertical and horizontal datums and were subsequently transformed using the National Oceanic and Atmospheric Administration's (NOAA) VDatum version 4.4.2 (v.4.4.2) transformation software (https://vdatum.noaa.gov/) horizontally to the North American Datum of 1983 (NAD83 [2011]) and vertically to the North American Vertical Datum of 1988 (NAVD88) relative to the GEOID model of 2012B (GEOID12B). 20230518 20230527 ground condition Complete None planned -74.77714535 -74.68483364 39.10639358 39.01224913 USGS Metadata Identifier USGS:bb2ff830-38d1-4b0c-a304-d70835209dbb ISO 19115 Topic Category oceans elevation location geoscientificInformation imageryBaseMapsEarthCover USGS Thesaurus marine geology marine geophysics geophysics bathymetry multibeam sonar ocean characteristics ocean processes sea-floor acoustic reflectivity None hydrography seafloor mapping Teledyne Reson T50-P Applanix POS MV Wavemaster II U.S. Geological Survey USGS St. Petersburg Coastal and Marine Science Center SPCMSC Geographic Names Information System (GNIS) Avalon Stone Harbor State of New Jersey Atlantic Ocean Cape May County Seven Mile Beach None May 2023 None Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. The U.S. Geological Survey requests to be acknowledged as originator of these data in future products or derivative research. Chelsea A. Stalk U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center Electronics Technician (Marine Instrumentation) mailing and physical

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St. Petersburg FL 33701 USA (727) 502-8000 cstalk@usgs.gov U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center Microsoft Windows 10 Version 22H2 (Build 19045.4046) Service Pack 1; NOAA’s VDatum (version 4.4.2); HYPACK/HYSWEEP (version 2022); Applanix POSPac MMS (POSPac) software (version 8.8, Service Pack 1); CARIS Hydrographic processing software HIPS/SIPS (version 11.4.28). Calder, B.R. and Wells, D.E. 20070129 Durham, NH University of New Hampshire, Center for Coastal and Ocean Mapping pages 1-54 https://scholars.unh.edu/ccom/1217 International Hydrographic Organization 200802 4, quai Antoine 1er B.P. 445 - MC 98011 MONACO Cedex Principaute de Monaco International Hydrographic Bureau pages 1-28 https://iho.int/uploads/user/pubs/standards/s-44/S-44_5E.pdf This dataset was from a single research cruise with exact instrumentation and set up and were therefore internally consistent. Methods were employed to maintain data collection consistency aboard the platform. During mobilization, each piece of equipment was isolated to obtain internal and external offset measurements with respect to the survey platform. All the critical measurements were recorded manually and digitally, into their respective programs. These files represent the post-processed bathymetric data (x,y,z) and acoustic intensity (.tiff) collected during a multibeam bathymetry survey. These data are the complete, post-processed x,y,z bathymetric and backscatter data points from multibeam data collected nearshore Seven Mile Island, New Jersey, May 2023. All data were collected and processed to meet or exceed International Hydrographic Organization (IHO) Special Order standards for positioning and depth (IHO, 2008). Individual Total Propagated Uncertainty (TPU) values associated with each node are available in the x,y,z file, with a mean of 5.49 centimeters (cm). All data were collected and processed to meet or exceed IHO Special Order standards for positioning and depth (IHO, 2008). Individual TPU values associated with each node are available in the x,y,z file, with a mean of 5.49 centimeters (cm). Transformed data have an additional reported vertical transformation error of 5.938 centimeters (cm). Acquisition: An ERS consisting of multibeam bathymetry and acoustic backscatter was conducted using two Teledyne Reson SeaBat T50-P multibeam echosounders, in dual-head configuration. The pair of Mills Cross (configuration) transmit and receive arrays were placed side-by-side within a bracket that oriented them at opposing 30-degree angles (relative to horizontal). The bracket was pole-mounted on the starboard gunnel of the research vessel (R/V) Sallenger, a 26-foot fiberglass vessel. The sonar arrays were oriented athwartships (primary and secondary arrays facing outward and down to port and starboard, respectively) and located approximately 1-m below the waterline when deployed. An Applanix Pos MV Wavemaster II V5 inertially aided navigation system was used for timing, positioning, and attitude. The Inertial Measurement Unit (IMU) was mounted atop the sonar bracket just aft of the pole. Two Trimble GA830 Global Navigation Satellite System (GNSS) antennas were affixed atop the cabin approximately amidships of the vessel, two meters apart, port-starboard. An AML Oceanographic Micro-X sound velocity sensor was used for speed of sound readings at the sonar head. A Sontek CastAway CTD was used for measuring sound velocity profiles. Hydrographic survey acquisition and processing software, HYPACK/HYSWEEP (version 2022) managed data inputs from sensors and produced two files (.RAW and .HSX). Data were collected in WGS84 [G1150] Universal Transverse Mercator (UTM) Zone 18 North (18N) coordinates. 20230526 Chelsea A. Stalk U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center mailing and physical

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St. Petersburg FL 33701 USA (727) 502-8000 cstalk@usgs.gov Processing: Positioning and attitude data were post-processed in Applanix POSPac MMS (POSPac) software version 8.6 Service Pack 3. Raw position files were imported into POSPac and processed with the IN-Fusion PP-RTX processing mode utilizing Trimble CenterPoint RTX technology, creating smoothed best estimate of trajectory (SBET) files and dynamic error files (SMRMSG) for each day of the survey. Bathymetric data were post-processed in CARIS Hydrographic processing software HIPS/SIPS version 11.4.28. HYPACK acquisition files (.HSX) were first imported into CARIS and then post-processed navigation files (SBET and SMRMSG) were imported and applied. Additionally, Global Positioning System (GPS) tide (GPS tidal corrections utilize GPS height information from real time survey observations to obtain an ellipsoid height) was computed and sound velocity profiles were applied. Roll calibration was also performed, as necessary. TPU was calculated from real time values recorded in the HSX and the SMRMSG files. Data were filtered to exclude any points with RESON Quality flags of 0, 1, and 2 (these flags are assigned to individual soundings at the time of acquisition and are a metric of pass/fail in regard to both brightness and collinearity: 0 = fail both, 1 = pass brightness only, 2 = pass collinearity only), as well as soundings that had a TPU greater than stated IHO Special Order standards (IHO, 2008). Refraction artifacts were addressed using the corrections tool within the Subset Editor. Additional editing was also performed in Subset Editor. A 1-m bathymetric CUBE surface was computed and a visual and statistical inspection of the data effecting the surface was performed and edited as needed to serve as quality control (Calder and Wells, 2007). The final surface was exported as an x,y,z ASCII file using the ‘Base Surface to ASCII’ function. 2023 2023_319_7Mile_MBES_1m_WGS84_UTM18N.xyz Chelsea A. Stalk U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center mailing and physical

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St. Petersburg FL 33701 USA (727) 502-8000 cstalk@usgs.gov Backscatter Mosaic Creation: Acoustic Intensity Backscatter data (.7k) were loaded in CARIS Hydrographic processing software HIPS/SIPS version 11.4.28 using the SIPS Backscatter tool. The final CUBE bathymetry surface serves as input for geometric corrections and average temperature and salinity data (derived from the Sontek CastAway CTD measurements taken during acquisition) are utilized by the program to calculate local absorption and transmission loss. These inputs, along with the following settings were entered into the tool, and then processing was initiated [Weighted Average = blending, image type = beam average, weighting = swath, and an Angle-Varying gain = 200]. During processing, the tool automatically creates a pattern file (.bbp) which is used to correct for variations in the beam pattern of the system. Upon completion, a 1-m backscatter mosaic with intensity values ranging from 34.654 to -52.57 dB (decibels) was created. After visual inspection, the mosaic was exported as a 32-bit float GeoTIFF (.tiff) using the ‘surface to GeoTIFF’ function. 2023 2023_319_7Mile_MBES_1m_Backscatter.tiff Chelsea A. Stalk U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center mailing and physical

600 4th Street South

St. Petersburg FL 33701 USA (727) 502-8000 cstalk@usgs.gov Datum Transformation: Final x,y,z ASCII data were converted using NOAA's VDatum v.4.4.2 software conversion tool from the WGS84 [G1150] realization to NAD83 [2011] NAVD88, using the GEOID12B model (orthometric height). 2023_319_7Mile_MBES_1m_WGS84_UTM18N.xyz 2023 2023_319_7Mile_MBES_1m_NAD83_UTM18N_NAVD88_G12B.xyz Chelsea A. Stalk U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center mailing and physical

600 4th Street South

St. Petersburg FL 33701 USA (727) 502-8000 cstalk@usgs.gov Point Point 21,163,976 Universal Transverse Mercator 18 0.999600 -75.0 0.0 500000.0 0.0 coordinate pair 0.6096 0.6096 meters World Geodetic System of 1984 WGS_84 6378137.0 298.257223563 World Geodetic System of 1984 0.001 meters Attribute values 2023_319_7Mile_MBES_1m_WGS84_UTM18N.xyz ASCII text (.xyz) file containing the processed 1-m bathymetric grid x,y,z data in the WGS84 [G1150] realization (ellipsoid height). HYPACK WGS84_UTM18N_X WGS84 UTM Zone 18N X-coordinate (easting) of sample point, in meters. HYPACK 519294.000 527250.000 0.001 WGS84_UTM18N_Y WGS84 UTM Zone 18N Y-coordinate (northing) of sample point, in meters. HYPACK 4318183.000 4328607.000 0.001 WGS84_Z WGS84 (ellipsoid height) of sample point, in meters. HYPACK -50.726 -38.013 0.001 TPU TPU = Total Propagated Uncertainty, in meters. CARIS 0.039 0.162 0.001 2023_319_7Mile_MBES_1m_NAD83_UTM18N_NAVD88_G12B.xyz ASCII text (.xyz) file containing the processed 1-m bathymetric grid x,y,z data in NAD83 [2011], NAVD88, which were derived using the GEOID12B model (orthometric height). HYPACK; VDatum NAD83_UTM18N_X NAD83 UTM Zone 18N X-coordinate (easting) of sample point, in meters. HYPACK; VDatum 519294.56172 527250.56084 0.00001 NAD83_UTM18N_Y NAD83 UTM Zone 18N Y-coordinate (northing) of sample point, in meters. HYPACK; VDatum 4318182.01308 4328606.01045 0.00001 NAVD88_GEOID12B_Z NAVD88 (orthometric height) of sample point, in meters, with respect to GEOID12B. HYPACK; VDatum -14.15800 -1.50300 0.00001 TPU_WGS84 Total Propagated Uncertainty, in meters, as reported for WGS84 data. A static uncertainty value of 5.938 cm is associated with the transformation of this data. CARIS 0.039 0.162 0.001 2023_319_7Mile_MBES_1m_Backscatter.tiff: Dataset is a GeoTIFF included in the download file, 7Mile_2023_MBES_Backscatter.zip, which is acoustic backscatter intensity data in 32-bit floating point GeoTIFF (.tiff) format with 16916 columns and 11484 rows. Dataset is projected to the WGS 1984 UTM Zone 18N coordinate system. 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. U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center USGS SPCMSC Data Management mailing and physical

600 4th Street South

Saint Petersburg FL 33701 United States 727-502-8000 gs-g-spcmsc_data_inquiries@usgs.gov 2023_319_7Mile_MBES_1m_WGS84_UTM18N.xyz, 2023_319_7Mile_MBES_1m_NAD83_UTM18N_NAVD88_G12B.xyz, 2023_319_7Mile_MBES_1m_Backscatter.tiff Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS shall not be held liable for improper or incorrect use of the data described or contained herein. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. columnar text, GeoTIFF ZIP 379 https://coastal.er.usgs.gov/data-release/doi-P13TUAJH/data/7Mile_2023_MBES_xyz.zip https://coastal.er.usgs.gov/data-release/doi-P13TUAJH/data/7Mile_2023_MBES_Backscatter.zip None 20240315 U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center USGS SPCMSC Data Management mailing and physical

600 4th Street South

Saint Petersburg FL 33701 United States 727-502-8000 gs-g-spcmsc_data_inquiries@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998