Metadata: Identification_Information: Citation: Citation_Information: Originator: Chelsea A. Stalk Originator: Jake J. Fredericks Originator: Jennifer L. Miselis Publication_Date: 20200215 Title: Coastal Multibeam Bathymetry Data Collected in August 2018 from the Chandeleur Islands, Louisiana Series_Information: Series_Name: U.S. Geological Survey Data Release Issue_Identification: doi:10.5066/P9E6E79E Publication_Information: Publication_Place: St. Petersburg, FL Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/P9E6E79E 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) offshore of the Chandeleur Islands, Louisiana, August 16-21, 2018. This dataset, Chandeleur_ Islands_2018_MBES_xyz.zip, includes the processed elevation point data (x,y,z), as derived from a 1-meter (m) bathymetric grid. Purpose: The purpose of the survey was to collect high-density multibeam bathymetry data in and around the northern Chandeleur Islands. Data were collected during USGS Field Activity Number (FAN) 2018-350-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=2018-350-FA. 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) vertical and horizontal datums and were subsequently transformed using the National Oceanic and Atmospheric Administration's (NOAA) VDatum version 3.9 (v.3.9) 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 2009 (GEOID09). Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20180816 Ending_Date: 20180821 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -88.886535 East_Bounding_Coordinate: -88.834105 North_Bounding_Coordinate: 30.072435 South_Bounding_Coordinate: 30.015551 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:b73570fd-af11-4172-9ea0-442eb9818d70 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: Louisiana Place_Keyword: Chandeleur Islands Place_Keyword: Chandeleur Sound Place_Keyword: Hewes Point Place_Keyword: Gulf of Mexico Place_Keyword: United States of America Temporal: Temporal_Keyword_Thesaurus: None Temporal_Keyword: August 2018 Access_Constraints: None Use_Constraints: 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. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jake J. Fredericks 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: jfredericks@usgs.gov Data_Set_Credit: U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center Native_Data_Set_Environment: Microsoft Windows 7 Version 6.2 (Build 9200) Service Pack 1 Cross_Reference: Citation_Information: Originator: Calder, B.R. and Wells, D.E. 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 3-12 Online_Linkage: https://scholars.unh.edu/ccom/1217 Cross_Reference: Citation_Information: Originator: International Hydrographic Organization Publication_Date: 2008 Title: IHO Standards for Hydrographic Surveys Publication_Information: Publication_Place: 4, quai Antoine 1er B.P. 445 - MC 98011 MONACO Cedex Principauté de Monaco Publisher: International Hydrographic Bureau Other_Citation_Details: pages 15-16 Online_Linkage: https://www.iho.int/iho_pubs/standard/S-44_5E.pdf Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: This dataset was from one research cruise and was 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: This file represents the post-processed bathymetric data (x,y,z) collected during a multibeam bathymetry survey. Completeness_Report: These are complete post-processed x,y,z bathymetric data points from multibeam data collected in the Chandeleur Islands, Louisiana, August 2018. 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 XYZ file. 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 XYZ file. Transformed data has an additional reported vertical transformation error of 7.6158 centimeters (cm). Lineage: Process_Step: Process_Description: Acquisition: An ERS 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 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 2018) managed data inputs from sensors and produced two files (.RAW and .HSX). Data were collected in WGS84 [G1762] Universal Transverse Mercator (UTM) Zone 16 North (16N) coordinates. Process_Date: 2018 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jake J. Fredericks 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: jfredericks@usgs.gov Process_Step: Process_Description: Processing: Positioning and attitude data were post-processed in Applanix POSPac MMS (POSPac) software version 8.4 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 11.1.3. HYPACK acquisition files (.HSX) were first imported into CARIS and then post-processed navigation files (SBET and SMRMSG) were imported and applied. Additionally, 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 regards 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 visual and statistical inspection of the data was performed to serve as quality control. A 1-m bathymetric CUBE surface was computed and the final surface was exported as an x,y,z ASCII file using the Base Surface to ASCII function. Process_Date: 2019 Source_Produced_Citation_Abbreviation: 2018_350_MBES_Chandeleurs_1m_WGS84_UTM16N.xyz Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Chelsea Stalk Contact_Organization: Cherokee Nation Technologies/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@contractor.usgs.gov Process_Step: Process_Description: Datum Transformation: Final x,y,z data were converted using NOAA's VDatum v.3.9 software conversion tool from the WGS84 [G1762] realization to NAD83 [2011] NAVD88, using the GEOID09 model (orthometric height). Process_Date: 2018 Source_Produced_Citation_Abbreviation: 2018_350_MBES_Chandeleurs_1m_NAD83_UTM16N_NAVD88_G09.xyz Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Chelsea Stalk Contact_Organization: Cherokee Nation Technologies/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@contractor.usgs.gov Process_Step: Process_Description: Added keywords section with USGS persistent identifier as theme keyword. Process_Date: 20201013 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: VeeAnn A. Cross Contact_Position: Marine Geologist Contact_Address: Address_Type: Mailing and Physical Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x2251 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: vatnipp@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: 9449833 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: -87.0 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: 2018_350_MBES_Chandeleurs_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 [G1762] realization (ellipsoid height). 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: 318163.000 Range_Domain_Maximum: 323118.000 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: 3322006.000 Range_Domain_Maximum: 3328231.000 Attribute_Measurement_Resolution: 0.01 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: -36.472 Range_Domain_Maximum: -30.098 Attribute_Measurement_Resolution: 0.001 Attribute: Attribute_Label: TPU Attribute_Definition: TPU = Total Propagated Uncertainty, in meters Attribute_Definition_Source: CARIS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.039 Range_Domain_Maximum: 0.307 Attribute_Measurement_Resolution: 0.001 Detailed_Description: Entity_Type: Entity_Type_Label: 2018_350_MBES_Chandeleurs_1m_NAD83_UTM16N_NAVD88_G09.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 GEOID09 model (orthometric height). Entity_Type_Definition_Source: HYPACK; VDatum Attribute: Attribute_Label: NAD83_UTM16N_X Attribute_Definition: NAD83 UTM Zone 16N X-coordinate (easting) of sample point, in meters. Attribute_Definition_Source: HYPACK; VDatum Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 318163.78850 Range_Domain_Maximum: 323118.78728 Attribute_Measurement_Resolution: 0.001 Attribute: Attribute_Label: NAD83_UTM16N_Y Attribute_Definition: NAD83 UTM Zone 16N Y-coordinate (northing) of sample point, in meters. Attribute_Definition_Source: HYPACK; VDatum Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 3322005.37826 Range_Domain_Maximum: 3328230.37702 Attribute_Measurement_Resolution: 0.001 Attribute: Attribute_Label: NAVD88_GEOID09_Z Attribute_Definition: NAVD88 (orthometric height) of sample point, in meters, with respect to GEOID09. Attribute_Definition_Source: HYPACK; VDatum Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -8.10426 Range_Domain_Maximum: -1.87377 Attribute_Measurement_Resolution: 0.001 Attribute: Attribute_Label: TPU Attribute_Definition: TPU = Total Propagated Uncertainty, in meters. A static uncertainty value of 7.6158 cm is associated with the transformation of this data. Attribute_Definition_Source: CARIS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.039 Range_Domain_Maximum: 0.307 Attribute_Measurement_Resolution: 0.001 Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Chelsea Stalk Contact_Organization: Cherokee Nation Technologies/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@contractor.usgs.gov Resource_Description: 2018_350_MBES_Chandeleurs_1m_WGS84_UTM16N.xyz, 2018_350_MBES_Chandeleurs_1m_NAD83_UTM16N_NAVD88_G09.xyz Distribution_Liability: 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. 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