Chelsea A. Stalk Hunter S. Wilcox Davina L. Passeri Christopher G. Smith Kathryn E.L. Smith Joseph F. Terrano 20210916 tabular, vector, and raster digital data Chelsea A. Stalk Hunter S. Wilcox Davina L. Passeri Christopher G. Smith Kathryn E.L. Smith Joseph F. Terrano 20210916 U.S. Geological Survey data release doi:10.5066/P93ZM9MK St. Petersburg, Florida U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center https://doi.org/10.5066/P93ZM9MK Scientists from the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center (USGS SPCMSC) in St. Petersburg, Florida, conducted a bathymetric survey of Point Aux Chenes Bay and a small portion of Grand Bay, Mississippi/Alabama, from March 3-6, 2021. Efforts were supported by the Estuarine and MaRsh Geology project (EMRG), and the data described will provide baseline bathymetric information for future research investigating wetland/marsh evolution, sediment transport, and recent and long-term geomorphic change. The data will also support modeling of future changes in response to restoration efforts and storm impacts. During this study, bathymetry data were collected aboard two personal watercrafts (PWC) outfitted with single-beam echosounders. These datasets, Grand_Bay_2021_SBES_xyz.zip and Point_Aux_Chenes_2021_SBES_xyz.zip in conjunction with all other provided data in this release, consist of single-beam bathymetry data collected within Grand Bay and Point Aux Chenes Bay, onboard two personal watercraft (PWC) vessels during the March 2021 Grand Bay and Point Aux Chenes Bay, Mississippi/Alabama survey. Additional survey and data details are available in the Coastal and Marine Geoscience Data System (CMGDS)at, https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-307-FA. For the single-beam bathymetry data, the differential positioning was obtained through post-processing the base station data to the rover. This dataset was transformed from the initial World Geodetic System of 1984 (WGS84) G1762 datum to North American Datum of 1983 (NAD83) reference frame and the North American Vertical Datum of 1988 (NAVD88), using the GEOID12A model (National Oceanic and Atmospheric Administration National Geodetic Survey (NOAA NGS) VDatum software version 4.1 - http://vdatum.noaa.gov/). Similar surveys have occurred in years prior, please see USGS Data Series 1070 for more information regarding acquisition and processing methods (DeWitt and others, 2017). 20210303 20210306 ground condition Complete None planned -88.494092 -88.395754 30.387609 30.295703 USGS Metadata Identifier USGS:90067a4c-9a0b-4a2a-85b5-d29da1c2ea93 Global Change Master Directory EARTH SCIENCE > OCEANS > COASTAL PROCESSES > ESTUARIES EARTH SCIENCE > OCEANS > COASTAL PROCESSES > MARSHES GOVERNMENT AGENCIES-U.S. FEDERAL AGENCIES > DOI > USGS DOI/USGS/CMG > COASTAL AND MARINE GEOLOGY, U.S. GEOLOGICAL SURVEY, U.S. DEPARTMENT OF INTERIOR USGS Thesaurus marine geology geophysics bathymetry single-beam echo sounder ocean characteristics ocean processes None U.S. Geological Survey hydrography bathymetry trackline single-beam bathymetry ISO 19115 Topic Category geoscientificinformation elevation oceans location imageryBaseMapsEarthCover Common Geographic Areas Mississippi Gulf of Mexico Grand Bay Alabama United States None 2021 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. These data should not be used for navigational purposes. Chelsea A. Stalk U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Electronics Technician (Marine Instrumentation) mailing and physical address

600 4th Street South

St. Petersburg FL 33701-4846 USA 727-502-8000 cstalk@usgs.gov Funding and (or) support for this study was provided by the USGS Coastal and Marine Geology Program. The authors are grateful to Jonathan Pitchford, with the Grand Bay National Research Refuge, who provided permitting, access, and assistance with field logistics. This document was improved by reviews from Andrew Farmer and Breanna Williams of the USGS - St. Petersburg, Florida. Environment as of Metadata Creation: Microsoft Windows 10 Version 1709 (Build 16299.666) Service Pack 1; Environmental Systems Research Institute (Esri) ArcGIS 10.6.0.8321 Nancy T. DeWitt Chelsea A. Stalk Christopher G. Smith Stanley D. Locker Jake J. Fredericks Terrance A. McCloskey Cathryn J. Wheaton 20171201 U.S. Geological Survey Data Series DS 1070 St. Petersburg, FL St. Petersburg Coastal and Marine Science Center https://doi.org/10.3133/ds1070 Joseph F. Terrano Kathryn E.L. Smith Jonathan L. Pitchford Michael Archer Michael Brochard 20210723 1.0 U.S. Geological Survey data release doi:10.5066/P9W8TNQM St. Petersburg, FL St. Petersburg Coastal and Marine Science Center https://doi.org/10.5066/P9W8TNQM The accuracy of the data is determined during data collection. This dataset is derived from a single field survey using identical equipment, set-ups, and staff; therefore, the dataset is internally consistent. Methods are employed to maintain data collection consistency aboard the platforms. 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 then digitally entered into their respective programs. Offsets between the single-beam transducers, motion reference units, and the antenna reference point (ARP) were measured and accounted for in post-processing. Differential Global Positioning System (DGPS) coordinates were obtained using post-processing software packages (NGS OPUS, and Waypoint Product Group GrafNav, version 8.7). These data were collected during one field activity with consistent instrument calibrations. This data release contains horizontal position and vertical elevation x,y,z single-beam data from March 2021 collected within Grand Bay and Point Aux Chenes Bay, MS/AL. Users are advised to read the complete metadata record carefully for additional details. All static base station sessions were processed through the Online Positioning User Service (OPUS) maintained by the NOAA NGS. The OPUS solutions were entered into a spreadsheet to compute a final, time-weighted position (latitude, longitude, and ellipsoid height) for each base station. The time-weighted positions for all base stations occupying established NPS benchmarks (B166 [PID: D05987] and 189A [PID: D05977]) were compared against the provided NPS coordinates as well as coordinate solutions from previous survey occupations. The time-weighted positions were within 3 standard deviations of the 2015 coordinate positions established during the initial survey (DeWitt and others, 2017), and therefore, to isolate variables when comparing the two datasets, the previous position coordinates were used in subsequent processing steps. The horizontal variability of the base station coordinates at B166 and 189A were determined by calculating the maximum difference of any individual occupation from the time-weighted average latitude and longitude values B166: 0.00010 seconds (s) latitude (0.26 centimeters [cm]), 0.00008 seconds longitude (0.20 cm); 189A: 0.00003 (0.08 cm) seconds latitude, 0.00007 seconds longitude (0.18 cm). All static base station sessions were processed through OPUS, which is maintained by NOAA and the NGS. The OPUS solutions were entered into a spreadsheet to compute a final, time-weighted position (latitude, longitude, and ellipsoid height) for each base station. The time-weighted positions for all base stations occupying established NPS marks (B166 [PID: D05987] and 189A [PID: D05977]) were compared against the provided NPS coordinates as well as coordinate solutions from previous survey occupations. The time-weighted positions were within 3 standard deviations of the 2015 coordinate positions established during the initial survey (DeWitt and others, 2017), and therefore, to isolate variables when comparing the two datasets, the previous position coordinates were used in subsequent processing steps. The vertical variability of the base station coordinates were determined by calculating the maximum difference of any individual occupation from the time-weighted average ellipsoid height values (B166: +/- 0.5 cm; 189A: +/- 2.3 cm). The base station erected on 189A benchmark served as the secondary for the survey, and data acquired did not need to be utilized for further processing. The kinematic (rover) trajectories were processed using GrafNav version 8.7 software by Novatel, Inc. Occurrences where a personal watercraft trackline crosses itself and the other PWC were evaluated to determine vertical uncertainty. The calculated root mean square (RMS) uncertainty for the PWC's are 0.05 meters (m) for both platforms individually, and when crossing each other. GPS Acquisition: Two Geographic Positioning System (GPS) base stations were established throughout the survey area, both of which were located on NPS established benchmarks. Benchmark 189A (PID: D05977) was located to the north-north west of the survey area near the railroad tracks at the entrance of the Grand Bay National Estuarine Research Reserve (GNDNERR), B166 (PID: D05987) was located northwest of the survey area at the boat launch location used for this survey. The base stations were continually occupied and equipped with a Spectra Precision SP90M (B166) and a Spectra Precision Proflex 800 (189A) GPS receiver recording full-carrier-phase positioning signals (L1/L2) from satellites via Thales Choke-ring antennas, recording at a rate of 0.1 s. 2021 U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Chelsea A. Stalk Electronics Technician (Marine Instrumentation) mailing and physical address

600 4th St. S

St. Petersburg FL 33701 USA 727-502-8000 cstalk@usgs.gov Single-Beam Bathymetry Acquisition: The single-beam bathymetric data were collected under the USGS Field Activity Number (FAN) 2021-307-FA, which encompass data from two separate survey platforms; the RV Shark (WVR1, 21CCT01), a 12-ft (foot) Yamaha PWC which collected 28.51 line-km (97 lines), and the RV Chum (WVR2, 21CCT02), an additional 12-ft Yamaha PWC which collected 190.28 line-km (91 lines). Boat motion was recorded at 50-millisecond (ms) intervals using a SBG Ellipse A #1 motion sensor aboard each PWC. HYPACK (version 18.1.8.0), a marine surveying, positioning, and navigation software package, managed the planned-transect information and provided real-time navigation, steering, correction, data quality, and instrumentation-status information to the boat operator. Depth soundings were recorded at 50-ms intervals using an Odom echotrac CV100 sounder with a 200-kilohertz (kHz) transducer. Data from the GPS receiver, motion sensor, and fathometer were recorded in real-time aboard all vessels independently and merged into a single raw data file (*.RAW) in HYPACK, with each device string referenced by a device identification code and time stamped to Coordinated Universal Time (UTC). Sound velocity profile (SVP) measurements were collected using three SonTek Castaway Conductivity, Temperature, and Depth (CTD) instruments. The instruments were periodically cast overboard to observe changes in water column speed of sound (SOS). A total of 74 successful sound velocity casts were taken throughout the survey at an average depth of 0.94 meters, and on average produced a sound velocity of 1492.32 meters per second (m/s). 2021 Chelsea A. Stalk U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Electronics Technician (Marine Instrumentation) mailing and physical address

600 4th Street South

St. Petersburg FL 33701 USA (727) 502-8000 cstalk@usgs.gov Differentially Corrected Navigation Processing: The coordinate values of the GPS base stations are the time-weighted average of values obtained from NGS OPUS. The base station coordinates were imported into GrafNav version 8.7 (Waypoint Product Group) and the kinematic GPS data from the survey vessel were post-processed to the concurrent GPS session data at the base stations. During processing, steps were taken to ensure that the trajectories between the base and the rover were free of erroneous solutions and resulted in fixed positions. By analyzing the graphs, trajectory maps, and processing logs that GrafNav produces for each GPS session, GPS data from satellites flagged by the program as having poor health or satellite time segments that had cycle slips could be excluded, or the satellite elevation mask angle could be adjusted to improve the position solutions. The final differentially corrected, precise DGPS positions were computed at 0.1 s and exported in American Standard Code for Information Interchange (ASCII) text format. Concurrent post-processed navigation data to single-beam data points replace the uncorrected rover positions, recorded during acquisition, in subsequent processing steps. The GPS data were processed and exported in the World Geodetic System of 1984 (WGS84) G1762 geodetic datum. 2021 Chelsea A. Stalk U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Electronics Technician (Marine Instrumentation) mailing and physical address

600 4th Street South

St. Petersburg FL 33701 USA (727) 502-8000 cstalk@usgs.gov All data were processed using CARIS HIPS and SIPS (Hydrographic Information Processing System and Sonar Information Processing System) version 11.3.0. The raw HYPACK data files were imported into CARIS, the differentially corrected navigation files were imported using the generic data parser tool, and any SVP casts were entered and edited using the SVP editor. The bathymetric data components (position, motion, depth, and SOS) were then merged and geometrically corrected in CARIS to produce processed x,y,z data. Next, the data were edited for outliers and then further reviewed in the Subset Editor utility for crossing status, and questionable data points or areas. The geometrically corrected point data were then exported as an x,y,z ASCII text file referenced to WGS84 (G1762), ellipsoid height in meters. 2021 U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Chelsea A. Stalk Electronics Technician (Maine Instrumentation) mailing and physical

600 4th Street South

St. Petersburg FL 33701 USA (727) 502-8000 cstalk@usgs.gov Quality Control, Quality Assurance (QA/QC) and Uncertainty Analysis: All single-beam data exported from CARIS and elevation data exported from GrafNav, were imported into Esri ArcMap version 10.6.0 utilizing the create feature class from an XY table function and plotted in 0.25-m color coded intervals utilizing symbology functions. First, all data were visually scanned for any obvious outliers or problems. Next, a trackline shapefile was produced using X-tools Pro (version 21.1.4313) "Make Polylines from Points" function for each survey platform. Utilizing both the x,y,z (point) and trackline (polyline) shapefiles, a Python script evaluated elevation differences at the intersection of crossing tracklines by calculating the elevation difference between points at each intersection using an inverse distance weighting equation with a search radius of 1 m. The RMS error for WVR1 (21CCT01), when crossing a trackline it previously surveyed, was 5.06 cm and when WVR2 (21CCT02) crossed a track line it previously surveyed, the RMS error was 4.60 cm. Once individual platform statistics were obtained, all data were merged, and crossing analysis yielded a 5.32 cm RMS error. These merged files were separated into three survey areas: Point Aux Chenes, Point Aux Chenes Reefs and Middle Bay. These files were then exported from Esri ArcMap as x,y,z text (.txt) files using the X-tools Pro "table to text" function, and made available in the download section of this data release, along with the populated trackline shapefiles. 21CCT01_PointAuxChenes_WVR1_SBES_WGS84_UTM16N_Level_03_xyz.txt 21CCT02_PointAuxChenes_WVR2_SBES_WGS84_UTM16N_Level_03_xyz.txt 2021 PointAuxChenes_2021_SBES_WGS84_UTM16N_xyz.txt PointAuxChenes_Reefs_2021_SBES_WGS84_UTM16N_xyz.txt MiddleBay_2021_SBES_WGS84_UTM16N_xyz.txt PointAuxChenes_2021_SBES_WGS84_UTM16N_Tracklines.shp PointAuxChenes_Reefs_2021_SBES_WGS84_UTM16N_Tracklines.shp MiddleBay_2021_SBES_WGS84_UTM16N_Tracklines.shp U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Chelsea A. Stalk Electronics Technician (Marine Instrumentation) mailing and physical

600 4th Street South

St. Petersburg FL 33701 USA (727) 502-8000 cstalk@usgs.gov Datum Transformation: NOAA's VDatum v.4.1 was used to transform the single-beam data points (x,y,z data) from their data acquisition datum (WGS84 G1762) to NAD83 NAVD88 using the NGS geoid model of 2012A (GEOID12A). For conversion from the WGS84 ellipsoid to NAVD88, there is a total of 7.616 cm of uncertainty in the transformation (NOAA/NGS's VDatum: Estimation of Vertical Uncertainties in VDatum, https://vdatum.noaa.gov/docs/est_uncertainties.html). Resultant data files have been made available in the downloads section of this data release. PointAuxChenes_2021_SBES_WGS84_UTM16N_xyz.txt PointAuxChenes_Reefs_2021_SBES_WGS84_UTM16N_xyz.txt MiddleBay_2021_SBES_WGS84_UTM16N_xyz.txt 2021 PointAuxChenes_2021_SBES_NAD83_UTM16N_NAVD88_G12A_xyz.txt PointAuxChenes_Reefs_2021_SBES_NAD83_UTM16N_NAVD88_G12A_xyz MiddleBay_2021_SBES_NAD83_UTM16N_NAVD88_G12A_xyz.txt U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Chelsea A. Stalk Electronics Technician (Marine Instrumentation) mailing and physical

600 4th Street South

St. Petersburg FL 33701 USA (727) 502-8000 cstalk@usgs.gov Shoreline Preparation: In order to provide the most accurate representation of the bathymetry within the nearshore areas, shoreline data was prepared and used in conjunction with the x,y,z data during subsequent processing steps. Shoreline polyline data provided in Terrano and others (2021), was first converted to points utilizing the XTools Function "Polylines to Points". Utilizing the "Buffer" analysis tool, a 100 m buffer was generated around the Point Aux Chenes and Middle Bay tracklines. The shoreline points were then clipped using the "Clip" analysis tool to each generated buffer file to ensure only shoreline points that fall within 100 m from a bathymetry point were utilized for further processing. Some manual editing of the resultant shoreline point file was necessary to ensure proper representation of the bathymetry extent. An integer field was added to the shoreline points attribute table named, "NAVD88_G12A" and the field populated with a zero-value utilizing the Field Calculator function to represent a zero elevation at the shoreline extent. The resultant point shapefile has been made available in the download section of this data release (Stalk and others, 2021). The shoreline points were then converted to a polygon utilizing the XTools Pro "Points to Polygons" function to establish an extent file to be used in later processing steps. Polygon vertices were manually added using the Editor tool to the western and eastern portions of Point Aux Chenes Bay, placed at the approximate land-water intersection using Esri's Imagery base map, as well as along the offshore extent of the x,y,z data. The resultant extent or coverage file was utilized in subsequent processing steps and has also been made available in the data download section of this data release (Stalk and others, 2021). GB_2020_shoreline.shp 2021 PointAuxChenes_2020_ShorelinePoints.shp MiddleBay_2020_ShorelinePoints.shp PointAuxChenes_2021_SBES_Coverage.shp MiddleBay_2021_SBES_Coverage.shp U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Chelsea A. Stalk Electronics Technician (Marine Instrumentation) mailing and physical

600 4th Street South

St. Petersburg FL 33701 USA (727) 502-8000 cstalk@usgs.gov Create Digital Elevation Model: The transformed x,y,z data described in the previous processing step were imported into ArcMap using the "Create Feature Class From XY Table" tool. The dataset, along with the generated shoreline points were used to create a triangulated irregular network (TIN) using the "Create TIN" tool. The TIN was subsequently converted into a raster file using the "TIN to Raster" tool with a cell size of 10 meters for both the Point Aux Chenes Bay and Middle Bay survey areas. The resultant raster was then clipped utilizing the "Extract by Mask" Analysis tool, utilizing the coverage file produced in the previous step. The final digital elevation model (DEM) was then exported from ArcMap as a 32-bit floating GeoTiff, utilizing the Natural Neighbor algorithm, and made available within the data downloads section of this data release (Stalk and others, 2021). As a part of standard QA/QC procedures, each DEM was compared to the associated x,y,z data, and associated RMSe values were populated. The Point Aux Chenes Bay DEM has a RMSe value of 0.027 m and the Middle Bay DEM, 0.036 m respectively. PointAuxChenes_2021_SBES_NAD83_UTM16N_NAVD88_G12A_xyz.txt MiddleBay_2021_SBES_NAD83_UTM16N_NAVD88_G12A_xyz.txt PointAuxChenes_2020_ShorelinePoints.shp MiddleBay_2020_ShorelinePoints.shp PointAuxChenes_2021_SBES_Coverage.shp MiddleBay_2021_SBES_Coverage.shp 2018 PointAuxChenes_2021_NAD83_NAVD88_G12A_10m_DEM.tif MiddleBay_2021_NAD83_NAVD88_G12A_10m_DEM.tif Geological Survey St. Petersburg Coastal and Marine Science Center Geological Survey Chelsea A. Stalk Electronics Technician (Marine Instrumentation) mailing and physical

600 4th Street South

St. Petersburg FL 33701 USA (727) 502-8000 cstalk@usgs.gov Point Point 1,791,276 Universal Transverse Mercator 16 0.999600 -87.000000 0.000000 500000.000000 0.000000 coordinate pair 0.6096 0.6096 meters North American Datum 1983 Geodetic Reference System 80 6378137.000000 298.257222101 North American Vertical Datum 1988 0.01 meters Attribute values PointAuxChenes_2021_SBES_NAD83_UTM16N_NAVD88_G12A_xyz.txt and PointAuxChenes_Reefs_2021_SBES_NAD83_UTM16N_NAVD88_G12A_xyz.txt. Comma-delimited x,y,z text file containing location, elevation, and date information collected with personal watercraft and ground-based GPS within Point Aux Chenes Bay, MS. U.S. Geological Survey NAD83_UTM16N_X NAD83 UTM x-axis coordinate (Zone 16N) U.S. Geological Survey 356411.150 368246.000 meters NAD83_UTM16N_Y NAD83 UTM y-axis coordinate (Zone 16N) U.S. Geological Survey 3352495.721 3359404.905 meters NAVD88_G12A z-value (elevation) in NAVD88 Geoid 12A U.S. Geological Survey -4.290 -0.105 meters NAD83_Lat NAD83 UTM y-axis coordinate (Zone 16N) U.S. Geological Survey 30.295798 30.358667 Decimal Degrees NAD83_Long NAD83 UTM x-axis coordinate (Zone 16N) U.S. Geological Survey -88.493469 -88.370816 Decimal Degrees Year Calendar Year of data acquisition U.S. Geological Survey 2021 2021 DOY Day of Year of data acquisition U.S. Geological Survey 62 65 UTC_Time Coordinated Universal Time (UTC) time of data acquisition U.S. Geological Survey 15:18:09.32 23:35:10.38 Hypack_Line Identifier assigned to each Hypack line. HYPACK/U.S. Geological Survey Sub-FAN identifier (21CCT01 or 21CCT02) followed by DOY, line number and start of line UTC time, separated by underscores. MiddleBay_2021_SBES_NAD83_UTM16N_NAVD88_G12A_xyz.txt Comma-delimited x,y,z text file containing location, elevation, and date information collected with personal watercraft and ground-based GPS within Middle Bay, MS/AL. U.S. Geological Survey NAD83_UTM16N_X NAD83 UTM x-axis coordinate (Zone 16N) U.S. Geological Survey 364139.205 365884.658 meters NAD83_UTM16N_Y NAD83 UTM y-axis coordinate (Zone 16N) U.S. Geological Survey 3361048.535 3362562.730 meters NAVD88_G12A z-value (elevation) in NAVD88 Geoid 12A U.S. Geological Survey -2.327 -0.281 meters NAD83_Lat NAD83 UTM y-axis coordinate (Zone 18N) U.S. Geological Survey 30.373794 30.387504 Decimal Degrees NAD83_Long NAD83 UTM x-axis coordinate (Zone 18N) U.S. Geological Survey -88.413998 -88.395852 Decimal Degrees Year Calendar Year of data acquisition U.S. Geological Survey 2021 2021 DOY Day of Year of data acquisition U.S. Geological Survey 62 62 UTC_Time UTC Time of data acquisition U.S. Geological Survey 17:30:39.24 19:19:03.81 Hypack_Line Identifier assigned to each Hypack line. HYPACK/U.S. Geological Survey Sub-FAN identifier (21CCT01 or 21CCT02) followed by DOY, line number and start of line UTC time, separated by underscores. Chelsea A. Stalk U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Electronics Technician (Marine Instrumentation) mailing and physical address

600 4th Street South

St. Petersburg FL 33701 USA (727) 502-8000 cstalk@usgs.gov Downloadable Data This digital publication was prepared by an agency of the United States Government. Although these data were processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. comma-delimited text, shapefile, and GeoTIFF ZIP 582.48 https://coastal.er.usgs.gov/data-release/doi-P93ZM9MK/data/Grand_Bay_2021_SBES_xyz.zip https://coastal.er.usgs.gov/data-release/doi-P93ZM9MK/data/Point_Aux_Chenes_2021_SBES_xyz.zip https://coastal.er.usgs.gov/data-release/doi-P93ZM9MK/data/Grand_Bay_2021_SBES_Tracklines.zip https://coastal.er.usgs.gov/data-release/doi-P93ZM9MK/data/Point_Aux_Chenes_2021_SBES_Tracklines.zip https://coastal.er.usgs.gov/data-release/doi-P93ZM9MK/data/Grand_Bay_2021_NAD83_NAVD88_G12A_DEM.zip https://coastal.er.usgs.gov/data-release/doi-P93ZM9MK/data/Point_Aux_Chenes_2021_NAD83_NAVD88_G12A_DEM.zip https://coastal.er.usgs.gov/data-release/doi-P93ZM9MK/data/Grand_Bay_Point_Aux_Chenes_2021_ShorelinePoints.zip https://coastal.er.usgs.gov/data-release/doi-P93ZM9MK/data/Grand_Bay_Point_Aux_Chenes_2021_Extent.zip None 20210916 20210901 Chelsea A. Stalk U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Electronics Technician (Marine Instrumentation) mailing and physical address

600 4th Street South

St. Petersburg FL 33701 USA (727) 502-8000 cstalk@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998