5-Meter Sample Resolution Interferometric Swath Bathymetric Data Collected in 2011 from the Chandeleur Islands, Louisiana (U.S. Geological Survey Field Activity Number 11BIM01)

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 20131231
Title:
5-Meter Sample Resolution Interferometric Swath Bathymetric Data Collected in 2011 from the Chandeleur Islands, Louisiana (U.S. Geological Survey Field Activity Number 11BIM01)
Geospatial_Data_Presentation_Form: ASCII
Online_Linkage: https://pubs.usgs.gov/ds/848/data/11BIM01_IFB_xyz.zip
Larger_Work_Citation:
Citation_Information:
Originator: Nancy T. DeWitt
Originator: William R. Pfeiffer
Originator: Julie C. Bernier
Originator: Noreen A. Buster
Originator: Jennifer L. Miselis
Originator: James G. Flocks
Originator: B.J. Reynolds
Originator: Dana S. Wiese
Originator: Kyle W. Kelso
Publication_Date: 20131231
Title:
Coastal Bathymetry Data Collected in 2011 from the Chandeleur Islands, Louisiana
Geospatial_Data_Presentation_Form: multimedia presentation
Series_Information:
Series_Name: U.S. Geological Survey Data Series
Issue_Identification: 848
Publication_Information:
Publication_Place: St. Petersburg, Florida
Publisher: U.S. Geological Survey
Online_Linkage: https://dx.doi.org/10.3133/ds848
Description:
Abstract:
As part of the Barrier Island Evolution Research Project, scientists from the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center conducted nearshore geophysical surveys off the northern Chandeleur Islands, Louisiana, in June of 2011. The overall objectives of the study are to better understand barrier-island geomorphic evolution, particularly storm-related depositional and erosional processes that shape the islands over annual to interannual timescales (1-5 years). Collection of geophysical data will allow us to identify relationships between the geologic history of the island and its present day morphology and sediment distribution. This mapping effort was the first in a series of three planned surveys in this area. High resolution geophysical data collected in each of three consecutive years along this rapidly changing barrier-island system will provide a unique time-series dataset that will significantly further the analyses and geomorphological interpretations of this and other coastal systems, improving our understanding of coastal response and evolution over short time scales (1-5 years). This report serves as an archive of processed interferometric swath and single-beam bathymetry data that were collected during two cruises (USGS Field Activity Numbers 11BIM01 and 11BIM02) along the northern portion of the Chandeleur Islands, Breton National Wildlife Refuge, Louisiana, in June of 2011. Geographic information system data products include a 50 m-cell-size interpolated bathymetry grid surface, trackline maps, and point data files. Additional files include error analysis maps, Field Activity Collection System logs, and formal Federal Geographic Data Committee metadata.
Purpose:
This zip archive contains the output of processed interferometric swath bathymetry data collected in June 2011 around the northern Chandeleur Islands, Louisiana. The interferometric swath samples are provided as ASCII x,y,z point data with a spatial resolution of 5 meters.
Supplemental_Information:
The swath bathymetry data were collected and processed in the ITRF2005 geodetic reference ellipsoid, whereas the single-beam data were collected and processed in WGS84 (G1150)/ITRF00. Both datasets were subsequently transformed horizontally to NAD83 and then vertically to NAVD88 and MLLW, using the GEOID09 model, with NOAA VDatum version 3.2 transformation software (http://vdatum.noaa.gov/). The final NAD83, NAVD88 x,y,z position data from each survey were merged to generate a digital elevation model with a cell-size resolution of 50 meters.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20110602
Ending_Date: 20110616
Currentness_Reference: ground condition
Status:
Progress: complete
Maintenance_and_Update_Frequency: none planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -88.922333
East_Bounding_Coordinate: -88.788534
North_Bounding_Coordinate: 30.101670
South_Bounding_Coordinate: 29.871926
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: elevation
Theme_Keyword: geoscientificInformation
Theme_Keyword: imageryBaseMapsEarthCover
Theme_Keyword: oceans
Theme:
Theme_Keyword_Thesaurus: General
Theme_Keyword: marine geology
Theme_Keyword: bathymetry
Theme_Keyword: interferometry
Theme_Keyword: swath
Theme_Keyword: Systems Engineering and Assessment
Theme_Keyword: SEA
Theme_Keyword: SWATHplus-M
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: 11BIM01
Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Chandeleur Islands
Place_Keyword: Gulf of Mexico
Place_Keyword: Chandeleur Sound
Place_Keyword: Louisiana
Access_Constraints: None
Use_Constraints:
The U.S. Geological Survey requests that it be referenced as the originator of this dataset in any future products or research derived from these data. These data should not be used for navigational purposes.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Nancy DeWitt
Contact_Position: Geologist
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: ndewitt@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

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The accuracy of the data is determined during data collection. This dataset is from one research cruise and is therefore internally consistent. Methods are employed to maintain data collection consistency aboard the platform. During mobilization, each piece of equipment is isolated to obtain internal and external offset measurements with respect to the survey platform. All the critical measurements are recorded manually and digitally entered into their respective programs. For the interferometric swath bathymetry, offsets between the sonar head and the DGPS antennas were measured and entered into the CodaOctopus F190R internal setup program. Differential Geographic Positioning System (DGPS) was provided through the OmniSTAR High Performance wide-area GPS service. DGPS is always implemented for navigational accuracy either during acquisition or as a post-processing step. These bathymetric data have not been independently verified for accuracy.
Logical_Consistency_Report:
This zip archive contains the post-processed interferometric swath bathymetric data from a single research cruise in June 2011. Refer to the online data series linkage for field logs, vessel platform descriptions, and other survey information.
Completeness_Report:
These are complete post-processed x,y,z bathymetry samples with 5-meter spatial resolution derived from acoustic interferometric swath data collected in June 2011 from around the northern Chandeleur Islands.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The 2-sigma (95%) horizontal accuracy of the OmniSTAR HP navigation used during swath bathymetry acquisition, as specified by OmniSTAR, is +/- 10 cm. The Coda Octopus F190R IMU, which integrates the OmniSTAR HP position with motion, measures vessel velocity (manufacturer's specified accuracy +/- 0.014 m/s), roll and pitch (+/- 0.025 degrees), heading (1-m baseline 0.1 degrees), and heave (5 cm per meter of depth).
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The 2-sigma (95%) vertical accuracy of the OmniSTAR HP navigation subscription used during swath bathymetry acquisition, as specified by OmniSTAR, is +/-15 cm. The Coda Octopus F190R IMU, which integrates the OmniSTAR HP position with motion, measures vessel velocity (manufacturer's specified accuracy +/- 0.014 m/s), roll and pitch(+/- 0.025 degrees), heading (1 m baseline 0.1 degrees), and heave (5 cm per meter of depth). The vertical accuracy for the SWATHplus-M system varies with depth and across track range. At 57 m it is accurate to 10 cm vertically. The maximum vertical transformation error reported by VDatum for eastern Louisiana is 17.1 centimeters.
Lineage:
Process_Step:
Process_Description:
Swath Bathymetry Acquisition: The interferometric swath bathymetry data were collected aboard the R/V SurveyCat using a SEA SWATHplus-m 234 kHz interferometric sonar system mounted on a sled attached to a rail system fastened between the catamaran hulls allowing the instrument to align directly below the GPS antennae in order to minimize geometry errors. Boat position and motion data were recorded in real time using a CodaOctopus F190R wetpod inertial measurement unit (IMU) mounted underwater between the transducer heads to minimize lever arm geometry errors between the observed depths and associated vessel motion. Real-time corrected positions were acquired via the use of the OmniSTAR HP (High-Precision differential global navigation satellite system) satellite constellation subscription. OmniSTAR HP position correction data and motion data from the IMU were integrated with interferometric soundings in the SWATHplus software package with positional and calibration offsets predefined by a session file (.sxs), allowing for real-time-corrected depths. Prior to deployment, all equipment offsets were surveyed in dry dock with the use of a laser total station. During the survey all swath tracklines were recorded in SEA raw data format (.sxr). A Valeport Mini Sound Velocity Sensor (SVS) was attached to the transducer mount and collected continuous SOS measurements at the depth of the transducers. These values were directly read and incorporated into the SWATHplus acquisition software giving real-time speed of sound at the transducer while underway. In addition, a separate sound velocity profiler (Valeport miniSVP) was used to collect speed of sound profiles (water surface to seafloor) at intervals throughout the survey.
Process_Date: 20110616
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Nancy DeWitt
Contact_Position: Geologist
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: ndewitt@usgs.gov
Process_Step:
Process_Description:
Swath Bathymetry Processing: Position data recorded by the Coda-Octopus F190R IMU system were corrected in real time via the OmniSTAR HP differential navigation system. The IMU also applied real-time motion corrections for heave, roll, and pitch to the vertical component of each position fix. The corrected positions were then integrated with the observed bathymetric values to calculate a final ellipsoid height and position representing the elevation of the seafloor with respect to the geodetic reference frame ITRF05 across the swath range. SWATHplus serves as both an acquisition software and initial processing software. Preliminary roll calibration trackline data were collected and processed using Systems Engineering and Assessment, Ltd., SWATHplus and Grid Processor software version 3.7.17. Instrument offset and calibrations values were input into the session file (.sxs), and the raw data files (.sxr) were then processed using the updated system configuration containing roll calibration values, measured equipment offsets, acquisition parameters, navigation and motion from the F190R, SOS at the sonar head, and SVP cast data. Any calibration offsets or acoustic filtering applied in SWATHplus is also written to the processed data file (.sxp), which can then be imported into advanced sounding data processing software such as CARIS HIPS and SIPS. The initial real-time processing datum for the swath and backscatter data was ITRF05, which is the acquisition datum for OmniSTAR HP position and navigation data. All processed data files were imported into CARIS HIPS and SIPS version 7.1, and the original sounding data were edited for outliers using the program's depth filters and reference surfaces. Any remaining outliers were then edited out manually. A CARIS BASE (Bathymetry with Associated Statistical Error) surface with associated CUBE (Combined Uncertainty and Bathymetry Estimator) sample surface was created from the edited soundings dataset. A BASE hypothesis is the estimated value of a grid node representing all the soundings within a chosen resolution or grid-cell size (for example, 5 m) weighted by uncertainty and proximity, giving the final value as a "sample" of the data within the specific grid cell. This algorithm allows for multiple grid-node hypotheses to be verified or overridden by the user, while maximizing processing efficiency. A 5-m resolution CUBE surface was created to perform initial hypothesis editing using the CARIS Subset Editor tool, followed by higher resolution surface detail editing within subset editor. The x,y,z data were exported as ASCII text at a 5 x 5 m sample resolution in the ellipsoid datum of ITRF05.
Process_Date: 20120301
Source_Produced_Citation_Abbreviation: 11BIM01_IFB_ITRF05_xyz.txt
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Nancy DeWitt
Contact_Position: Geologist
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: ndewitt@usgs.gov
Process_Step:
Process_Description:
Datum transformation: Using the transformation software VDatum version 3.2, the interferometric swath x,y,z samples were transformed horizontally from their data acquisition datum (International Terrestrial Reference Frame of 2005, ITRF05) to the North American Datum of 1983 (NAD83) reference frame and the North American Vertical Datum of 1988 (NAVD88) orthometric elevation and Mean Lower Low Water (MLLW) tidal datum using the National Geodetic Survey (NGS) geoid model of 2009 (GEOID09).
Process_Date: 20130428
Source_Produced_Citation_Abbreviation: 11BIM01_IFB_NAD83_NAVD88_GEOID09_xyz.txt
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Nancy DeWitt
Contact_Position: Geologist
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: ndewitt@usgs.gov

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: 11BIM01_IFB_ITRF05_xyz.txt
Entity_Type_Definition:
ASCII text file containing the processed 5-meter resolution interferometric swath bathymetry x,y,z samples in the International Terrestrial Reference Frame of 2005 (ITRF05) geodetic datum.
Entity_Type_Definition_Source: USGS
Detailed_Description:
Entity_Type:
Entity_Type_Label: 11BIM01_IFB_NAD83_NAVD88_G09_xyz.txt
Entity_Type_Definition:
ASCII text file containing the processed 5-meter resolution interferometric swath bathymetry x,y,z samples transformed to the North American Datum of 1983 (NAD83) geodetic datum and North American Vertical Datum of 1988 (NAVD88) orthometric height, derived using the GEOID09 model.
Entity_Type_Definition_Source: USGS
Detailed_Description:
Entity_Type:
Entity_Type_Label: 11BIM01_IFB_WGS84_MLLW_xyz.txt
Entity_Type_Definition:
ASCII text file containing the processed 5-meter resolution interferometric swath bathymetry x,y,z samples transformed to the World Geodetic System of 1984 (WGS84 G1150) geodetic datum and Mean Lower Low Water (MLLW) tidal datum.
Entity_Type_Definition_Source: USGS
Attribute:
Attribute_Label: ITRF05_X
Attribute_Definition: ITRF05 x-coordinate (easting) of sample point, in meters
Attribute_Definition_Source: CARIS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 314720.000
Range_Domain_Maximum: 327410.000
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: ITRF05_Y
Attribute_Definition: ITRF05 y-coordinate (northing) of sample point, in meters
Attribute_Definition_Source: CARIS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3305985.000
Range_Domain_Maximum: 3331525.000
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: ITRF05_Z
Attribute_Definition: ITRF05 ellipsoid height of sample point, in meters
Attribute_Definition_Source: CARIS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -47.729
Range_Domain_Maximum: -28.218
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: DataType
Attribute_Definition: Geophysical data type
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: IFB
Enumerated_Domain_Value_Definition: interferometric swath bathymetry
Enumerated_Domain_Value_Definition_Source: USGS
Attribute:
Attribute_Label: Year
Attribute_Definition: Year data was collected
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Unrepresentable_Domain: Character string
Attribute:
Attribute_Label: Lon_ITRF05
Attribute_Definition: ITRF05 longitude of sample point, in decimal degrees
Attribute_Definition_Source: VDatum
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -88.922228
Range_Domain_Maximum: -88.788541
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: 0.00001
Attribute:
Attribute_Label: Lat_ITRF05
Attribute_Definition: ITRF05 latitude of sample point, in decimal degrees
Attribute_Definition_Source: VDatum
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 29.871932
Range_Domain_Maximum: 30.101676
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.00001
Attribute:
Attribute_Label: NAD83_X
Attribute_Definition: NAD83 x-coordinate (easting) of sample point, in meters
Attribute_Definition_Source: VDatum
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 314720.7184
Range_Domain_Maximum: 327410.7151
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: NAD83_Y
Attribute_Definition: NAD83 y-coordinate (northing) of sample point, in meters
Attribute_Definition_Source: VDatum
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3305984.3869
Range_Domain_Maximum: 3331524.3813
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: NAVD88_G09
Attribute_Definition: NAVD88 GEOID09 orthometric height of sample point, in meters
Attribute_Definition_Source: VDatum
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -19.318
Range_Domain_Maximum: 0.0984
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: Lon_NAD83
Attribute_Definition: NAD83 longitude of sample point, in decimal degrees
Attribute_Definition_Source: VDatum
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -88.922220
Range_Domain_Maximum: -88.788534
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: 0.00001
Attribute:
Attribute_Label: Lat_NAD83
Attribute_Definition: NAD83 latitude of sample point, in decimal degrees
Attribute_Definition_Source: VDatum
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 29.871926
Range_Domain_Maximum: 30.101670
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.00001
Attribute:
Attribute_Label: Lon_WGS84
Attribute_Definition: WGS84 (G1150) longitude of sample point, in decimal degrees
Attribute_Definition_Source: VDatum
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -88.922228
Range_Domain_Maximum: -88.788541
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: 0.00001
Attribute:
Attribute_Label: Lat_WGS84
Attribute_Definition: WGS84 (G1150) latitude of sample point, in decimal degrees
Attribute_Definition_Source: VDatum
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 29.871931
Range_Domain_Maximum: 30.101676
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.00001
Attribute:
Attribute_Label: MLLW
Attribute_Definition: MLLW tidal elevation of sample point, in meters
Attribute_Definition_Source: VDatum
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -19.242
Range_Domain_Maximum: -0.0045
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.001

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Nancy DeWitt
Contact_Position: Geologist
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: ndewitt@usgs.gov
Resource_Description: Downloadable Data
Distribution_Liability:
This DVD publication was prepared by an agency of the United States Government. Although these data have been 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: ASCII
File_Decompression_Technique: ZIP
Transfer_Size: 43.0 MB
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: https://pubs.usgs.gov/ds/848/data/11BIM01_IFB_xyz.zip
Offline_Option:
Offline_Media: DVD-ROM
Recording_Format: UDF
Fees: none
Technical_Prerequisites:
The ASCII text files contained in the .zip archive can be accessed with any standard text file reader.

Metadata_Reference_Information:
Metadata_Date: 20131231
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Nancy DeWitt
Contact_Position: Geologist
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: ndewitt@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Use_Constraints:
The U.S. Geological Survey requests that it be referenced as the originator of this dataset in any future products or research derived from these data.
Metadata_Security_Information:
Metadata_Security_Classification_System: none
Metadata_Security_Classification: unclassified
Metadata_Security_Handling_Description: None

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