Coastal Bathymetry Data Collected in 2016 from the Chandeleur Islands, Louisiana–Interpolated Digital Elevation Model

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Andrew S. Farmer
Originator: Jake J. Fredericks
Originator: Jennifer L. Miselis
Originator: Noreen A. Buster
Originator: Nancy T. DeWitt
Originator: Kyle W. Kelso
Originator: Chelsea A. Stalk
Originator: B.J. Reynolds
Publication_Date: 20181115
Title:
Coastal Bathymetry Data Collected in 2016 from the Chandeleur Islands, Louisiana–Interpolated Digital Elevation Model
Geospatial_Data_Presentation_Form: raster digital data
Series_Information:
Series_Name: U.S. Geological Survey Data Release
Issue_Identification: doi:10.5066/P993MBJK
Online_Linkage: https://doi.org/10.5066/P993MBJK
Description:
Abstract:
The U.S. Geological Survey St. Petersburg Coastal and Marine Science Center (USGS SPCMSC), collected single beam and swath bathymetry data from the northern Chandeleur Islands, Louisiana, in June of 2016. This USGS data release includes the resulting processed elevation point data (xyz) and an interpolated digital elevation model (DEM). This USGS data release provides 437-line kilometers (km) of processed single beam bathymetry (SBB) and interferometric bathymetry (IFB) data collected under Field Activity Number (FAN) 2016-335-FA. This FAN encompasses two subfans each of which represents one survey vessel; the research vessel (RV) Sallenger (subFAN 16BIM01) collected IFB data and the RV Jabba Jaw (subFAN 16BIM02) acquired SB) data. SBB and IFB point data (xyz) are provided in two datums; the International Terrestrial Reference Frame of 2008 (ITRF08) and ellipsoid height and the North American Datum of 1983 (NAD83) in the CORS96 realization for the horizontal and the North American Vertical Datum of 1988 (NAVD88), using the geoid model of 2009 (GEOID09), orthometric height for the vertical. Additional files provided in this data release include: trackline shapefiles, digital and handwritten field logs, and a comprehensive 50-meter (m) DEM. For additional information regarding data collection and processing of the sounding data, please refer to the field logs and formal Federal Geographic Data Committee (FGDC) metadata for the individual IFB and SBB point data (xyz) files and survey trackline shapefiles also included within this publication and available at, https://doi.org/10.5066/P993MBJK.
Purpose:
This zip archive contains the 50-m DEM created from the processed IFB and SBB x,y,z data points collected in June 2016 (FAN 2016-335-FA; subFANs 16BIM01 and 16BIM02) around the Chandeleur Islands, Louisiana. The 50-m DEM is provided as a zipped GeoTIFF file with associated metadata. Additional survey and data details are available at https://cmgds.marine.usgs.gov/fan_info.php?fan=2016-335-FA.
Supplemental_Information:
Chandeleur_Islands_2016_SBB_and_IFB_ NAD83_NAVD88_GEOID09_50_DEM.tif was derived from the processed swath data are provided as American Standard Code for Information Interchange (ASCII) xyz point data files. These values are not the individual soundings, they are the exported BASE (Bathymetry with Associated Statistical Error) surface at 5-m spatial distances with associated CUBE (Combined Uncertainty and Bathymetry Estimator) sample surface created from the edited soundings dataset using CARIS HIPS and SIPS version 9.1. These are considered interpolated samples in which one value represents all soundings within a five-meter node, weighted by uncertainty and proximity, giving the final value as a data sample within the specific grid cell.
The swath bathymetry data were collected and processed in the World Geodetic System of 1984 (WGS84[1762]) datum, which is equivalent ITRF08. This dataset was transformed from ITRF08 to the NAD83 geodetic datum and NAVD88 orthometric height, using the GEOID09 with the National Oceanic and Atmospheric Administration (NOAA) VDatum version 3.6 transformation software (http://vdatum.noaa.gov/).
The single beam surveys were acquired and processed to a geodetic reference ellipsoid. The single beam data were collected using stand-alone GPS and then post-processed to obtain Differential Global Positioning System (DGPS) navigation. All single beam surveys were collected in WGS84 (G1150), which is equivalent to the International Terrestrial Reference Frame of 2000 (ITRF00). This dataset was transformed from ITRF00 to both ITRF08 and the NAD83 geodetic datum with NAVD88 orthometric height, using the GEOID09 model via NOAA’s VDatum software. The final NAD83/NAVD88 GEOID09 SBB and IFB x,y,z position data from this survey were merged to generate a single point file that was subsequently used to create the interpolated DEM, Chandeleur_Islands_2016_SBB_and_IFB_ NAD83_NAVD88_GEOID09_50_DEM.tif.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20160610
Ending_Date: 20160619
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Not planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -88.903941
East_Bounding_Coordinate: -88.832887
North_Bounding_Coordinate: 30.072349
South_Bounding_Coordinate: 30.014080
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:7d99da63-c857-49f1-998d-21c6144acbeb
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: geophysics
Theme_Keyword: bathymetry
Theme_Keyword: single-beam echo sounder
Theme_Keyword: multibeam sonar
Theme_Keyword: digital elevation models
Theme_Keyword: field monitoring stations
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: interferometry
Theme_Keyword: swath
Theme_Keyword: Systems Engineering and Assessment
Theme_Keyword: SEA
Theme_Keyword: SWATHplus-H
Theme_Keyword: hydrography
Theme_Keyword: geophysical
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: CMGP
Theme_Keyword: St. Petersburg Coastal and Marine Science Center
Theme_Keyword: SPCMSC
Theme_Keyword: Barrier Island Evolution Research Project
Theme_Keyword: Barrier Island Mapping
Theme_Keyword: 2016-335-FA
Theme_Keyword: datum
Theme_Keyword: shoreline
Theme_Keyword: interferometric bathymetry
Theme_Keyword: IFB
Theme_Keyword: trackline
Theme_Keyword: shapefile
Theme_Keyword: HYPACK
Theme_Keyword: single-beam bathymetry
Theme_Keyword: SBB
Theme_Keyword: base station
Theme_Keyword: Chandeleur Islands benchmark stamping CTMP
Theme_Keyword: kinematic
Theme_Keyword: ODOM Echotrach CV-100
Theme_Keyword: ODOM
Theme_Keyword: TSS Motion Sensor
Theme_Keyword: echosounder
Theme_Keyword: SPCMSC
Theme_Keyword: 16BIM01
Theme_Keyword: 16BIM02
Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Louisiana
Place_Keyword: Gulf of Mexico
Place_Keyword: Chandeleur Islands
Stratum:
Stratum_Keyword_Thesaurus: Oregon Geospatial Enterprise Office (GEO) Stratum Keyword
Stratum_Keyword: sea surface
Stratum_Keyword: epipelagic
Temporal:
Temporal_Keyword_Thesaurus: None
Temporal_Keyword: June 2016
Access_Constraints: None.
Use_Constraints:
These data should not be used for navigational purposes. 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: Andrew S. Farmer
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: afarmer@usgs.gov
Data_Set_Credit:
U.S. Geological Survey, Coastal and Marine Geology Program, St. Petersburg Coastal and Marine Science Center
Native_Data_Set_Environment:
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.2.2.3552
Cross_Reference:
Citation_Information:
Originator: Jake J. Fredericks
Originator: Noreen A. Buster
Originator: Nancy T. DeWitt
Originator: Kyle W. Kelso
Originator: Jennifer L. Miselis
Publication_Date: 20161221
Title:
Coastal Interferometric Swath Bathymetry Data Collected in 2015 from the Chandeleur Islands, Louisiana
Series_Information:
Series_Name: U.S. Geological Survey Data Release
Issue_Identification: doi:10.5066/F7NV9GC8
Online_Linkage: https://doi.org/10.5066/F7NV9GC8
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The accuracy of the data was determined during data collection. Each dataset used to create the DEM came from singular research vessels during the field activity. Therefore, datasets are internally consistent. Methods were 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 digitally entered into their respective programs.
For the interferometric swath bathymetry, (USGS FAN 2016-335-FA, subFAN 16BIM01), offsets between the sonar head and the DGPS antennas were measured and entered into the Coda Octopus F190R+ internal setup program. The DGPS correction was obtained from the Marinestar High-precision (HP) differential global navigation satellite system, a satellite positioning service, from Fugro, Incorporated (Inc.). This signal was received through the Coda Octopus F190R+ primary GPS antenna. These bathymetric data have not been independently verified for accuracy. The dataset was collected in the native format of WGS84 (G1762), which is equivalent at the centimeter level to the ITRF08.
For the single-beam survey (USGS FAN 2015-355-FA, subFAN 16BIM02), offsets between the single-beam transducers, the Ashtech antenna reference point (ARP), and the vessel motion units were measured on the roving vessels. All pertinent measurements were accounted for in the DGPS post processing software packages (National Geodetic Survey On-Line Positioning User Service, OPUS, and Waypoint Product Group GrafNav, version 8.6).
How accurately the DEM represents the data depends on how closely the chosen DEM resolution compares to sounding distribution. For example, there may be hundreds of samples in a 50-m by 50-m cell; however, they are only represented on the surface by a single cell value. Therefore, in cases where terrain slope is high, the gridding formula reduces the actual variability in the sample data.
Logical_Consistency_Report:
This file represents the post-processed bathymetric data (xyz) collected during a 2016 bathymetry survey (2016-335-FA). The DEM represents data coverage for the interferometric swath (subFAN 16BIM01) and single-beam bathymetry (subFAN 16BIM02) collected in the nearshore waters surrounding the Chandeleur Islands, Louisiana. Refer to the supplemental information section of the data release for field logs, vessel platform descriptions, and other survey information.
Completeness_Report:
The data used to create this DEM are complete, post-processed xyz bathymetric data points from acoustic swath and single-beam data collected near the Chandeleur Islands, Louisiana, in June 2016.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
For the IFB: Navigation information was recorded in real-time kinematic mode via the CODA Octopus F190R+ Precision Attitude and Positioning System. Differential GPS correction was obtained through the Marinestar HP broadcast subscription from Fugro, Inc. The manufacturer's stated horizontal accuracy is 10 centimeters (cm) 95% of the time. The trackline position data were recorded using HYPACK version 15.0.1.1 hydrographic acquisition and processing software.
For the SBB: The USGS-installed benchmark, CTMP, was occupied on the northern Chandeleur Islands for the duration of the field activity, 6/12/16 – 6/16/16. The static GPS base station sessions used On-Line Positioning User Service (OPUS), which is maintained by National Oceanic and Atmospheric Administration (NOAA) and the National Geodetic Survey (NGS). The base location results from OPUS were entered into a spreadsheet to compute one final coordinate and error analysis for that base location. Using the OPUS values for each day, and the total time per GPS session, the average weighted value of occupation time was calculated so the longer occupations hold more value than shorter occupations. The final value for latitude, longitude, and ellipsoid height was the weighted average of each GPS session processed with OPUS. This value was entered into GrafNav version 8.6 as the base station coordinates. The range from the average values was calculated, using outputs from OPUS, for each session as the absolute value of the final value minus the daily value. The maximum horizontal range of the base station coordinates used for post-processing the single-beam bathymetry was 0.00027 decimal seconds latitude and 0.00025 decimal seconds longitude.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
For the IFB: The manufacturer's stated vertical accuracy of Marinestar GPS subscription is 15 cm, 95% of the time. The Coda Octopus F190R+ inertial measurement unit (IMU), which integrates the Marinestar position with motion, measures vessel velocity (+/- 0.014 meters/second [m/s]), roll and pitch (less than 0.025 degrees), heading (1 m baseline 0.1 degrees), and heave (5 cm/m of depth). The vertical accuracy for the SWATHplus-H system varies with depth and across track range. At 57 m, it is accurate to 10 cm vertically. Maximum vertical transformation error reported by VDatum version 3.6 was 0.076158 m or 7.6158 cm for eastern Louisiana. The sum of the errors (+/- 0.013 m + +/-0.15 m + 0.076158 m) in the vertical direction is equal to +/-0.334 m or +/- 33.4 cm.
For the SBB: All static base station sessions for CTMP were processed through OPUS. The base location results from OPUS were entered into a spreadsheet to compute a final, time-weighted positional coordinate (latitude, longitude, and ellipsoid height). Base-station position error for each GPS session was calculated as the absolute value of the final position minus the session position value. SPCMSC standards define the maximum acceptable vertical error for any individual base station GPS session as less than or equal to three times the standard deviation of the ellipsoid height; any occupations exceeding this error are removed, and the base station coordinates are then recalculated and considered final. For CTMP base location, the standard deviation of the ellipsoid height was 0.004 m and the maximum difference from the average ellipsoid for any GPS session was 0.013 m.
Lineage:
Process_Step:
Process_Description:
Gridding Bathymetric Data: Using Esri ArcGIS 10.3.1, xyz bathymetric point data were used to create a Triangulated Irregular Network (TIN) surface using the 'Create TIN' tool within the 3D Analyst toolbox. The TIN dataset was used to create a gridded raster surface, using the 'TIN to Raster' tool within the 3D Analyst toolbox. The raster was interpolated using the nearest neighbor method with a 50-m cell size.
Process_Date: 20161016
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: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 127
Column_Count: 135
Vertical_Count: 1
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: 0.9996
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: row and column
Coordinate_Representation:
Abscissa_Resolution: 50
Ordinate_Resolution: 50
Planar_Distance_Units: meter
Geodetic_Model:
Horizontal_Datum_Name: North American Datum 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257222
Vertical_Coordinate_System_Definition:
Depth_System_Definition:
Depth_Datum_Name: North American Vertical Datum 1988 (GEOID09)
Depth_Resolution: 0.001
Depth_Distance_Units: meter
Depth_Encoding_Method: Implicit coordinate
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label:
Chandeleur_Islands_2016_SBB_and_IFB_NAD83_NAVD88_GEOID09_50_DEM.tif
Entity_Type_Definition:
This raster image file (in GeoTIFF format) contains a digital elevation model of processed SBB and IFB xyz data collected in 2016 from the Chandeleur Islands, Louisiana, and provided in the North American Datum 1983 (NAD83) in the CORS96 realization and North American Vertical Datum 1988 (NAVD88), using the geoid model of 2009 (GEOID09).
Entity_Type_Definition_Source: USGS
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Andrew S. Farmer
Contact_Organization:
U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
Contact_Position: Physical Scientist/Hydrographic Technician
Contact_Address:
Address_Type: mailing and physical address
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: afarmer@usgs.gov
Resource_Description:
Chandeleur_Islands_2016_SBB_and_IFB_NAD83_NAVD88_GEOID09_50_DEM.tif
Distribution_Liability:
This 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.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: GeoTIFF
File_Decompression_Technique: ZIP
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
https://coastal.er.usgs.gov/data-release/doi-P993MBJK/data/Chandeleur_Islands_2016_SBB_and_IFB_NAD83_NAVD88_GEOID09_50_DEM.zip
Fees: none
Technical_Prerequisites: None
Metadata_Reference_Information:
Metadata_Date: 20201013
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Andrew S. Farmer
Contact_Organization:
U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
Contact_Position: Physical Scientist/Hydrographic Technician
Contact_Address:
Address_Type: mailing and physical address
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: afarmer@usgs.gov
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Use_Constraints:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.
Metadata_Security_Information:
Metadata_Security_Classification_System: none
Metadata_Security_Classification: unclassified
Metadata_Security_Handling_Description: None
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