Metadata:
Identification_Information:
Citation:
Citation_Information:
Originator: Chelsea A. Stalk
Originator: Christopher C. Bemelmans
Originator: Jennifer L. Miselis
Publication_Date: 20250325
Title: Coastal Bathymetry and Backscatter Data Collected in June-August 2023 From the Chandeleur Islands, Louisiana
Geospatial_Data_Presentation_Form: raster digital data, tabular digital data
Larger_Work_Citation:
Citation_Information:
Originator: Chelsea A. Stalk
Originator: Christopher C. Bemelmans
Originator: Jennifer L. Miselis
Publication_Date: 20250325
Title: Coastal Bathymetry and Backscatter Data Collected in June-August 2023 From the Chandeleur Islands, Louisiana
Series_Information:
Series_Name: U.S. Geological Survey data release
Issue_Identification: doi:10.5066/P1NWHXZS
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/P1NWHXZS
Description:
Abstract: 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 areas around the Chandeleur Islands, Louisiana (LA), during 2 survey legs: June 12-21 and July 31-August 11, 2023. The download file, Chandeleur_Islands_2023_MBES_xyz.zip, includes processed elevation point data (x,y,z), as derived from a 1-meter (m) bathymetric grid. The download file, Chandeleur_Islands_2023_MBES_Backscatter.zip, includes acoustic backscatter intensity data in 32-bit floating point GeoTIFF (Geographic Tagged Image File Format, .tiff) format.
Purpose: The purpose of this study was to conduct a morphologic and geologic assessment of the impacts of the 2020 and 2021 hurricane seasons within part of the Breton National Wildlife Refuge. With data from previous surveys, these data will be used to quantify sediment redistribution. Data were collected during USGS Field Activity Number (FAN) 2023-325-FA. Single-beam bathymetry data and seismic reflection data were acquired as a part of the same field activity, refer to Lyons and others (2025) and Forde and others (2024), respectively, for further details. 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=2023-325-FA. Seismic data were also acquired as a part of this field activity, please refer to Forde and others (2024) for further details.
Supplemental_Information: The processed sonar data are provided as American Standard Code for Information Interchange (ASCII) x,y,z point data files. 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) (G1150 realization) horizontal and vertical datums, and were subsequently transformed using the National Oceanic and Atmospheric Administration's (NOAA) VDatum version 4.2.2 (v.4.2.2) 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 2018 (GEOID18).
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20230612
Ending_Date: 20230811
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -89.18871485
East_Bounding_Coordinate: -89.09223983
North_Bounding_Coordinate: 29.48448296
South_Bounding_Coordinate: 29.09223983
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:45cf2584-078d-427c-aec3-11f02f61a87e
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: oceans
Theme_Keyword: elevation
Theme_Keyword: location
Theme_Keyword: geoscientificInformation
Theme_Keyword: imageryBaseMapsEarthCover
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: marine geology
Theme_Keyword: marine geophysics
Theme_Keyword: geophysics
Theme_Keyword: bathymetry
Theme_Keyword: multibeam sonar
Theme_Keyword: ocean characteristics
Theme_Keyword: ocean processes
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: hydrography
Theme_Keyword: seafloor mapping
Theme_Keyword: Teledyne Reson T50-P
Theme_Keyword: Applanix POS MV Wavemaster II
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: St. Petersburg Coastal and Marine Science Center
Theme_Keyword: SPCMSC
Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: State of Louisiana
Place_Keyword: Chandeleur Islands
Place_Keyword: Hewes Point
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Chandeleur Islands, Louisiana
Place_Keyword: Mid-Gulf Coast
Temporal:
Temporal_Keyword_Thesaurus: None
Temporal_Keyword: June - August 2023
Access_Constraints: No access constraints. Please see 'Distribution Information' for details.
Use_Constraints: These data are marked with a Creative Common CC0 1.0 Universal License. These data are in the public domain and do not have any use constraints. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Christopher C. Bemelmans
Contact_Organization: U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
Contact_Position: Electronics Technician (Marine Instrumentation)
Contact_Address:
Address_Type: mailing and physical
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: (727)502-8000
Contact_Electronic_Mail_Address: cbemelmans@usgs.gov
Data_Set_Credit: U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
Native_Data_Set_Environment: Microsoft Windows 10 Version 622H2 (Build 19045.4046); NOAA VDatum (version 4.2.2); HYPACK®, A Xylem Brand and HYPACK HYSWEEP® (version 22.3.1.0); Applanix POSPac MMS (POSPac) software (version 8.8, Service Pack 1); Teledyne CARIS™ Hydrographic processing software HIPS and SIPS (version 11.4.28).
Cross_Reference:
Citation_Information:
Originator: International Hydrographic Organization (IHO)
Publication_Date: 20191031
Title: The IHO-IOC GEBCO Cook Book
Publication_Information:
Publication_Place: Monaco
Publisher: International Hydrographic Organization, Intergovernmental Oceanographic Commission
Other_Citation_Details: pages 81-83
Online_Linkage: https://www.gebco.net/data_and_products/gebco_cook_book/
Cross_Reference:
Citation_Information:
Originator: Caris
Publication_Date: 20150601
Title: CARIS HIPS and SIPS Training Manual
Publication_Information:
Publication_Place: Fredericton, NB, Canada
Publisher: Caris
Other_Citation_Details: pages 1-446
Cross_Reference:
Citation_Information:
Originator: Dr. Bruno Scherzinger
Originator: Joe Hutton
Publication_Date: 2025
Title: Applanix IN-Fusion+™: the Ultimate Solution for Enhanced Spatial Intelligence
Publication_Information:
Publication_Place: Westminster, Colorado
Publisher: Trimble
Other_Citation_Details: pages 1-9
Online_Linkage: https://applanix.trimble.com/en/resources/flipbooks/applanix-in-fusion-plus-the-ultimate-solution-for-enhanced-spatial
Cross_Reference:
Citation_Information:
Originator: Brian R. Calder
Originator: David E. Wells
Publication_Date: 20070129
Title: CUBE User's Manual
Publication_Information:
Publication_Place: Durham, NH
Publisher: University of New Hampshire, Center for Coastal and Ocean Mapping
Other_Citation_Details: pages 1-54
Online_Linkage: https://scholars.unh.edu/ccom/1217
Cross_Reference:
Citation_Information:
Originator: International Hydrographic Organization (IHO)
Publication_Date: 200802
Title: IHO Standards for Hydrographic Surveys
Publication_Information:
Publication_Place: 4, quai Antoine 1er B.P. 445 - MC 98011 MONACO Cedex Principaute de Monaco
Publisher: International Hydrographic Bureau
Other_Citation_Details: pages 1-28
Online_Linkage: https://iho.int/uploads/user/pubs/standards/s-44/S-44_5E.pdf
Cross_Reference:
Citation_Information:
Originator: Erin O. Lyons
Originator: Chelsea A. Stalk
Originator: Jennifer L. Miselis
Originator: Noreen A. Buster
Originator: Julie C. Bernier
Originator: Nancy T. DeWitt
Publication_Date: 20250325
Title: Coastal Single-beam Bathymetry Data Collected in 2023 from the Chandeleur Islands, Louisiana
Series_Information:
Series_Name: U.S. Geological Survey data release
Issue_Identification: doi:10.5066/P1HJAVAR
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/P1HJAVAR
Cross_Reference:
Citation_Information:
Originator: Arnell S. Forde
Originator: Jennifer L. Miselis
Originator: Chelsea A. Stalk
Originator: Noreen A. Buster
Publication_Date: 20240515
Title: Chirp Sub-Bottom Profile Geophysical Data Collected in 2023 From the Chandeleur Islands, Louisiana
Series_Information:
Series_Name: U.S. Geological Survey data release
Issue_Identification: doi:10.5066/P1HOLGKM
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/P1HOLGKM
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: This dataset was from a single field effort with two survey legs, each 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 entered into their respective programs.
Logical_Consistency_Report: These files represent the post-processed bathymetric (x,y,z) and acoustic intensity (dB) data during a multibeam bathymetry survey.
Completeness_Report: These data are the complete, post-processed x,y,z bathymetric and backscatter data points from multibeam data collected nearshore the Chandeleur Islands, Louisiana, June-August, 2023.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: 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 value of 0.056 m.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: 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 value of 0.067 m. Data transformed using Vdatum have an additional reported vertical transformation error of 0.065 meters (m).
Lineage:
Process_Step:
Process_Description: Acquisition: An ERS consisting of multibeam bathymetry 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® and HYPACK HYSWEEP® (version 22.3.1.0) managed data inputs from sensors and produced two files (.RAW and .HSX). Data were collected in WGS84 (G1150) Universal Transverse Mercator (UTM) Zone 16 North (16N) coordinates. Multibeam and backscatter data were collected in three areas: to the east of Hewes Point (referred to as 'MainAOI'), a portion of the single-beam survey coverage (Lyons and others, 2025) north and west of Hewes Point ('SBESCoverage'), and offshore of the southernmost Chandeleur Islands ('SouthernRecon'). Multibeam coverage was extended outside of the main AOI to ensure complete coverage of the survey area during the survey period (west, single-beam survey) and to support geophysical data collection (SouthernRecon).
Process_Date: 20230811
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Christopher C. Bemelmans
Contact_Organization: U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
Contact_Address:
Address_Type: mailing and physical
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: (727) 502-8000
Contact_Electronic_Mail_Address: cbemelmans@usgs.gov
Process_Step:
Process_Description:
Processing:
Positioning and attitude data were post-processed in Applanix POSPac MMS (POSPac) software version 8.8 Service Pack 1. Raw position files were imported into POSPac and processed with the IN-Fusion PP-RTX processing mode utilizing Trimble CenterPoint RTX technology (Scherzinger and Hutton, 2025), 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 Teledyne CARIS™ Hydrographic processing software HIPS and 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 (Caris, 2015). Additionally, Global Positioning System (GPS) tide (GPS tidal corrections utilize GPS height information from real time survey observations to obtain an ellipsoid height) were applied (IHO, 2019). Sound Velocity Profiles (SVPs) were edited in the SVP editor where all observations from the water line to the sonar heads (1 m water depth) were rejected along with any outlying data. After editing, the SVPs were applied to the sounding data. Roll calibration was also performed, as necessary. TPU was calculated from real time values recorded in the HSX and the SMRMSG files (IHO, 2019). 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 Refraction Editor. Further editing was 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). Gaps in the continuous surface were caused by limitations in swath width and planned line navigation within shallow waters. The final surface was exported as an x,y,z ASCII file using the Base Surface to ASCII function.
Process_Date: 2023
Source_Produced_Citation_Abbreviation: 2023_325_Chandeleurs_MBES_MainAOI_1m_WGS84_UTM16N.xyz
Source_Produced_Citation_Abbreviation: 2023_325_Chandeleurs_MBES_SBESCoverage_1m_WGS84_UTM16N.xyz
Source_Produced_Citation_Abbreviation: 2023_325_Chandeleurs_MBES_SouthernRecon_1m_WGS84_UTM16N.xyz
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Christopher C. Bemelmans
Contact_Organization: U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
Contact_Address:
Address_Type: mailing and physical
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: (727) 502-8000
Contact_Electronic_Mail_Address: cbemelmans@usgs.gov
Process_Step:
Process_Description: 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 -17.63 to 3.156 dB (decibels) was created for each survey area. After visual inspection, the mosaic was exported as a 32-bit float GeoTIFF (.tiff) using the surface to GeoTIFF function.
Process_Date: 2023
Source_Produced_Citation_Abbreviation: 2023_325_Chandeleurs_MBES_MainAOI_1m_Backscatter.tiff
Source_Produced_Citation_Abbreviation: 2023_325_Chandeleurs_MBES_SBESCoverage_1m_Backscatter.tiff
Source_Produced_Citation_Abbreviation: 2023_325_Chandeleurs_MBES_SouthernRecon_1m_Backscatter.tiff
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Christopher C. Bemelmans
Contact_Organization: U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
Contact_Address:
Address_Type: mailing and physical
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: (727) 502-8000
Contact_Electronic_Mail_Address: cbemelmans@usgs.gov
Process_Step:
Process_Description: Datum Transformation: Final x,y,z data were converted using NOAA's VDatum v.4.2.2 software conversion tool from the WGS84 [G1150] realization to NAD83 [2011] NAVD88, using the GEOID18 model (orthometric height).
Process_Date: 2023
Source_Produced_Citation_Abbreviation: 2023_325_Chandeleurs_MBES_MainAOI_1m_NAD83_NAVD88_G18.xyz
Source_Produced_Citation_Abbreviation: 2023_325_Chandeleurs_MBES_SBESCoverage_1m_NAD83_NAVD88_G18.xyz
Source_Produced_Citation_Abbreviation: 2023_325_Chandeleurs_MBES_SouthernRecon_1m_NAD83_NAVD88_G18.xyz
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Christopher C. Bemelmans
Contact_Organization: U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
Contact_Address:
Address_Type: mailing and physical
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: (727) 502-8000
Contact_Electronic_Mail_Address: cstalk@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: 45,543,457
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 16
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999600
Longitude_of_Central_Meridian: -87.000000
Latitude_of_Projection_Origin: 0.0
False_Easting: 500000.0
False_Northing: 0.0
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_84
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257223563
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: World Geodetic System of 1984
Altitude_Resolution: 0.001
Altitude_Distance_Units: meters
Altitude_Encoding_Method: Attribute values
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: 2023_325_Chandeleurs_MBES_MainAOI_1m_WGS84_UTM16N.xyz
Entity_Type_Definition: ASCII text (.txt) file containing the processed 1-m bathymetric grid x,y,z data in the WGS84 [G1150] realization (ellipsoid height) of the main area of interest (AOI), east of Hewes Point.
Entity_Type_Definition_Source: HYPACK®
Attribute:
Attribute_Label: WGS84_UTM16N_X
Attribute_Definition: WGS84 UTM Zone 16N X-coordinate (easting) of sample point, in meters.
Attribute_Definition_Source: HYPACK®
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 318941.000
Range_Domain_Maximum: 326520.000
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: WGS84_UTM16N_Y
Attribute_Definition: WGS84 UTM Zone 16N Y-coordinate (northing) of sample point, in meters.
Attribute_Definition_Source: HYPACK®
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3313791.000
Range_Domain_Maximum: 3329030.000
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: WGS84_Z
Attribute_Definition: WGS84 (ellipsoid height) of sample point, in meters.
Attribute_Definition_Source: HYPACK®
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -39.292
Range_Domain_Maximum: -30.016
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: TPU
Attribute_Definition: TPU = Total Propagated Uncertainty, in meters.
Attribute_Definition_Source: Teledyne CARIS™
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.040
Range_Domain_Maximum: 0.260
Attribute_Measurement_Resolution: 0.001
Detailed_Description:
Entity_Type:
Entity_Type_Label: 2023_325_Chandeleurs_MBES_SBESCoverage_1m_WGS84_UTM16N.xyz
Entity_Type_Definition: ASCII text (.txt) file containing the processed 1-m bathymetric grid x,y,z data in the WGS84 [G1150] realization (ellipsoid height) of a portion of the single-beam (SBES) survey coverage (Lyons and others, 2025) north and west of Hewes Point.
Entity_Type_Definition_Source: HYPACK®
Attribute:
Attribute_Label: WGS84_UTM16N_X
Attribute_Definition: WGS84 UTM Zone 16N X-coordinate (easting) of sample point, in meters.
Attribute_Definition_Source: HYPACK®
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 314182.000
Range_Domain_Maximum: 319686.000
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: WGS84_UTM16N_Y
Attribute_Definition: WGS84 UTM Zone 16N Y-coordinate (northing) of sample point, in meters.
Attribute_Definition_Source: HYPACK®
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3319827.000
Range_Domain_Maximum: 3328890.000
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: WGS84_Ellipsoid_Z
Attribute_Definition: WGS84 (ellipsoid height) of sample point, in meters.
Attribute_Definition_Source: HYPACK®
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -37.477
Range_Domain_Maximum: -32.290
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: TPU
Attribute_Definition: TPU = Total Propagated Uncertainty, in meters.
Attribute_Definition_Source: Teledyne CARIS™
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.040
Range_Domain_Maximum: 0.256
Attribute_Measurement_Resolution: 0.001
Detailed_Description:
Entity_Type:
Entity_Type_Label: 2023_325_Chandeleurs_MBES_SouthernRecon_1m_WGS84_UTM16N.xyz
Entity_Type_Definition: ASCII text (.txt) file containing the processed 1-m bathymetric grid x,y,z data in the WGS84 [G1150] realization (ellipsoid height) offshore of the southernmost Chandeleur Islands.
Entity_Type_Definition_Source: HYPACK®
Attribute:
Attribute_Label: WGS84_UTM16N_X
Attribute_Definition: WGS84 UTM Zone 16N X-coordinate (easting) of sample point, in meters.
Attribute_Definition_Source: HYPACK®
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 316450.000
Range_Domain_Maximum: 322444.000
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: WGS84_UTM16N_Y
Attribute_Definition: WGS84 UTM Zone 16N Y-coordinate (northing) of sample point, in meters.
Attribute_Definition_Source: HYPACK®
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3291078.000
Range_Domain_Maximum: 3299262.000
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: WGS84_Ellipsoid_Z
Attribute_Definition: WGS84 (ellipsoid height) of sample point, in meters.
Attribute_Definition_Source: HYPACK®
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -34.787
Range_Domain_Maximum: -29.487
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: TPU
Attribute_Definition: TPU = Total Propagated Uncertainty, in meters.
Attribute_Definition_Source: Teledyne CARIS™
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.040
Range_Domain_Maximum: 0.220
Attribute_Measurement_Resolution: 0.001
Detailed_Description:
Entity_Type:
Entity_Type_Label: 2023_325_Chandeleurs_MBES_MainAOI_1m_NAD83_NAVD88_G18.xyz
Entity_Type_Definition: ASCII text (.txt) file containing the processed 1-m bathymetric grid x,y,z data in NAD83 [2011], NAVD88, which were derived using the GEOID18 model (orthometric height) of the main area of interest (AOI), east of Hewes Point.
Entity_Type_Definition_Source: VDatum
Attribute:
Attribute_Label: NAD83_UTM16N_X
Attribute_Definition: NAD83 UTM Zone 16N X-coordinate (easting) of sample point, in meters.
Attribute_Definition_Source: VDatum
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 318941.85794
Range_Domain_Maximum: 326520.85528
Attribute_Measurement_Resolution: 0.00001
Attribute:
Attribute_Label: NAD83_UTM16N_Y
Attribute_Definition: NAD83 UTM Zone 16N Y-coordinate (northing) of sample point, in meters.
Attribute_Definition_Source: VDatum
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3313790.42426
Range_Domain_Maximum: 3326029.42104
Attribute_Measurement_Resolution: 0.00001
Attribute:
Attribute_Label: NAVD88_GEOID18_Z
Attribute_Definition: NAVD88 (orthometric height) of sample point, in meters, with respect to GEOID12B.
Attribute_Definition_Source: VDatum
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -10.962
Range_Domain_Maximum: -2.020
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: TPU_WGS84
Attribute_Definition: Total Propagated Uncertainty, in meters, as reported for WGS84 (G1150) data. A static uncertainty value of 0.065 meters (m) is associated with the transformation of this data.
Attribute_Definition_Source: Teledyne CARIS™
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.040
Range_Domain_Maximum: 0.220
Attribute_Measurement_Resolution: 0.001
Detailed_Description:
Entity_Type:
Entity_Type_Label: 2023_325_Chandeleurs_MBES_SBESCoverage_1m_NAD83_NAVD88_G18.xyz
Entity_Type_Definition: ASCII text (.txt) file containing the processed 1-m bathymetric grid x,y,z data in NAD83 [2011], NAVD88, which were derived using the GEOID18 model (orthometric height) a portion of the single-beam survey (SBES) coverage (Lyons and others, 2025) north and west of Hewes Point.
Entity_Type_Definition_Source: VDatum
Attribute:
Attribute_Label: NAD83_UTM16N_X
Attribute_Definition: NAD83 UTM Zone 16N X-coordinate (easting) of sample point, in meters.
Attribute_Definition_Source: VDatum
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 314182.85875
Range_Domain_Maximum: 319686.85782
Attribute_Measurement_Resolution: 0.00001
Attribute:
Attribute_Label: NAD83_UTM16N_Y
Attribute_Definition: NAD83 UTM Zone 16N Y-coordinate (northing) of sample point, in meters.
Attribute_Definition_Source: VDatum
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3319826.42345
Range_Domain_Maximum: 3328889.42131
Attribute_Measurement_Resolution: 0.00001
Attribute:
Attribute_Label: NAVD88_GEOID18_Z
Attribute_Definition: NAVD88 (orthometric height) of sample point, in meters, with respect to GEOID12B.
Attribute_Definition_Source: VDatum
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -9.170
Range_Domain_Maximum: -4.019
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: TPU_WGS84
Attribute_Definition: Total Propagated Uncertainty, in meters, as reported for WGS84 (G1150) data. A static uncertainty value of 0.065 meters (m) is associated with the transformation of this data.
Attribute_Definition_Source: Teledyne CARIS™
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.040
Range_Domain_Maximum: 0.260
Attribute_Measurement_Resolution: 0.001
Detailed_Description:
Entity_Type:
Entity_Type_Label: 2023_325_Chandeleurs_MBES_SouthernRecon_1m_NAD83_NAVD88_G18.xyz
Entity_Type_Definition: ASCII text (.txt) file containing the processed 1-m bathymetric grid x,y,z data in NAD83 [2011], NAVD88, which were derived using the GEOID18 model (orthometric height) offshore of the southernmost Chandeleur Islands.
Entity_Type_Definition_Source: VDatum
Attribute:
Attribute_Label: NAD83_UTM16N_X
Attribute_Definition: NAD83 UTM Zone 16N X-coordinate (easting) of sample point, in meters.
Attribute_Definition_Source: VDatum
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 316450.85608
Range_Domain_Maximum: 322444.85513
Attribute_Measurement_Resolution: 0.00001
Attribute:
Attribute_Label: NAD83_UTM16N_Y
Attribute_Definition: NAD83 UTM Zone 16N Y-coordinate (northing) of sample point, in meters.
Attribute_Definition_Source: VDatum
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3291077.42993
Range_Domain_Maximum: 3299261.42785
Attribute_Measurement_Resolution: 0.00001
Attribute:
Attribute_Label: NAVD88_GEOID18_Z
Attribute_Definition: NAVD88 (orthometric height) of sample point, in meters, with respect to GEOID12B.
Attribute_Definition_Source: VDatum
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -7.709
Range_Domain_Maximum: -2.251
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: TPU_WGS84
Attribute_Definition: Total Propagated Uncertainty, in meters, as reported for WGS84 (G1150) data. A static uncertainty value of 0.065 meters (m) is associated with the transformation of this data.
Attribute_Definition_Source: Teledyne CARIS™
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.040
Range_Domain_Maximum: 0.220
Attribute_Measurement_Resolution: 0.001
Overview_Description:
Entity_and_Attribute_Overview: 2023_325_Chandeleurs_MBES_MainAOI_1m_Backscatter.tiff, 2023_325_Chandeleurs_MBES_SBESCoverage_1m_Backscatter.tiff, 2023_325_Chandeleurs_MBES_SouthernRecon_1m_Backscatter.tiff: Datasets are GeoTIFFs included in the download file, Chandeleur_Islands_2023_MBES_Backscatter.zip, which is acoustic backscatter intensity data in 32-bit floating point GeoTIFF (.tiff) format with 21229 columns and 19507 rows (min/max [decibels] of -60.21 to 16.8055), 20920 columns and 13168 rows (min/max [decibels] of -45.65 to 18.74), 22452 columns and 12504 rows (min/max [decibels] of -64.91 to 18.7297), respectively. Dataset is projected to the WGS 1984 UTM Zone 18N coordinate system. Backscatter data were collected in three areas: to the east of Hewes Point (referred to as 'MainAOI'), a portion of the single-beam survey coverage (Lyons and others, 2025) north and west of Hewes Point ('SBESCoverage'), and offshore of the southernmost Chandeleur Islands ('SouthernRecon').
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: 2023_325_Chandeleurs_MBES_MainAOI_1m_WGS84_UTM16N.xyz, 2023_325_Chandeleurs_MBES_MainAOI_1m_NAD83_NAVD88_G18.xyz, 2023_325_Chandeleurs_MBES_MainAOI_1m_Backscatter.tiff, 2023_325_Chandeleurs_MBES_SBESCoverage_1m_WGS84_UTM16N.xyz, 2023_325_Chandeleurs_MBES_SBESCoverage_1m_NAD83_NAVD88_G18.xyz, 2023_325_Chandeleurs_MBES_SBESCoverage_1m_Backscatter.tiff, 2023_325_Chandeleurs_MBES_SouthernRecon_1m_WGS84_UTM16N.xyz, 2023_325_Chandeleurs_MBES_SouthernRecon_1m_NAD83_NAVD88_G18.xyz, 2023_325_Chandeleurs_MBES_SouthernRecon_1m_Backscatter.tiff
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: columnar text, GeoTIFF
File_Decompression_Technique: ZIP
Transfer_Size: 160
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: https://coastal.er.usgs.gov/data-release/doi-P1NWHXZS/data/Chandeleur_Islands_2023_MBES_xyz.zip
Network_Resource_Name: https://coastal.er.usgs.gov/data-release/doi-P1NWHXZS/data/Chandeleur_Islands_2023_MBES_Backscatter.zip
Fees: None
Metadata_Reference_Information:
Metadata_Date: 20250324
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