Andrew S. Farmer
Jake J. Fredericks
Jennifer L. Miselis
Noreen A. Buster
Nancy T. DeWitt
Kyle W. Kelso
Chelsea A. Stalk
B.J. Reynolds
20181115
Coastal Bathymetry Data Collected in 2016 from the Chandeleur Islands, Louisiana–Interferometric Bathymetry Soundings (XYZ)
tabular and vector digital data
U.S. Geological Survey Data Release
doi:10.5066/P993MBJK
St. Petersburg, FL
U.S. Geological Survey
https://doi.org/10.5066/P993MBJK
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 208-line kilometers (km) of processed 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 single beam bathymetry (SBB) 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) 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 DEM.
For further information regarding IFB data collection and/or processing methods from 2011 and 2012, refer to USGS Data Series 847 and 848(https://doi.org/10.3133/ds847 and https://doi.org/10.3133/ds848).
The IFB zip archives contain processed sounding point data (xyz) and trackline shapefiles collected in June 2016 (FAN 2016-335-FA; subFAN 16BIM01) around the Chandeleur Islands, Louisiana. Additional survey and data details are available at https://cmgds.marine.usgs.gov/fan_info.php?fan=2016-335-FA.
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-meter spatial distances with an 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[G1762]) datum, which is equivalent to ITRF08. This dataset was transformed from ITRF08 to the NAD83 geodetic datum with NAVD88 orthometric height, using the geoid model of 2009 (GEOID09) via the National Oceanic and Atmospheric Administration (NOAA) VDatum version 3.6 transformation software (https://vdatum.noaa.gov/), and are included in this data release as both Chandeleur_Islands_2016_IFB_ITRF08_xyz.txt and Chandeleur_Islands_2016_IFB_NAD83_NAVD88_GEOID09_xyz.txt.
20160610
20160619
ground condition
Not planned
-88.878361
-88.833079
30.072475
30.014710
USGS Metadata Identifier
USGS:193a4733-c965-408e-a5cb-efcffdd1ac4d
ISO 19115 Topic Category
oceans
elevation
location
geoscientificInformation
imageryBaseMapsEarthCover
USGS Thesaurus
marine geology
geophysics
bathymetry
multibeam sonar
navigational data
None
interferometry
swath
Systems Engineering and Assessment
SEA
SWATHplus-H
hydrography
geophysical
U.S. Geological Survey
USGS
Coastal and Marine Geology Program
CMGP
St. Petersburg Coastal and Marine Science Center
SPCMSC
Barrier Island Evolution Research Project
Barrier Island Mapping
2016-335-FA
16BIM01
datum
shoreline
interferometric bathymetry
IFB
Geographic Names Information System (GNIS)
Louisiana
Gulf of Mexico
Chandeleur Islands
Oregon Geospatial Enterprise Office (GEO) Stratum Keyword
sea surface
epipelagic
None
June 2016
None.
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.
Jake J. Fredericks
U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
mailing and physical
600 4th Street South
St. Petersburg
FL
33701
USA
(727)502-8000
jfredericks@usgs.gov
U.S. Geological Survey, Coastal and Marine Geology Program, St. Petersburg Coastal and Marine Science Center
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.2.2.3552
Jake J. Fredericks
Noreen A. Buster
Nancy T. DeWitt
Kyle W. Kelso
Jennifer L. Miselis
20161221
Coastal Interferometric Swath Bathymetry Data Collected in 2015 from the Chandeleur Islands, Louisiana
U.S. Geological Survey Data Release
doi:10.5066/F7NV9GC8
https://doi.org/10.5066/F7NV9GC8
The accuracy of the data was determined during data collection. 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. Offsets between the Inertial Measurement Unit (IMU) and the Differential Global Positioning System (DGPS) antennas were measured and entered into the CodaOctopus F190R+ internal setup program. Offsets between sonar reference points and the IMU reference points were entered into the SWATHplus survey system. The DGPS correction was obtained from Marinestar High-precision (HP) differential global navigation satellite system, a satellite positioning service, from Fugro, Inc. This signal was received through the Coda Octopus F190R+ GPS antennas. These bathymetric data have not been independently verified for accuracy.
This file represents the post-processed bathymetric data (xyz) collected during a 2016 swath bathymetry survey (2016-335-FA).
These are complete post-processed xyz bathymetric data points from acoustic swath data collected near the Chandeleur Islands, Louisiana, in June 2016.
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 14.09.47 hydrographic acquisition and processing software.
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 per meter (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 centimeters 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.
Swath Bathymetry Acquisition: The interferometric swath bathymetry data were collected aboard the R/V Sallenger in June 2016 using the SEA SWATHplus-H 468 kHz interferometric sonar system. The transducer system was fastened to a static pole mount deployed over the starboard side gunnel. The Novatel GPS antennas were mounted atop the cabin. Boat position and motion data were recorded in real-time using a CodaOctopus F190R+. The IMU was mounted underwater between the transducer heads to minimize lever arm geometry errors between observed depths and vessel motion. Real-time corrected positions were acquired via Marinestar HP DGPS subscription service from Fugro, Inc. Marinestar HP position correction data and motion data from the IMU were integrated with interferometric soundings using SWATHplus software, version 3.10.2.0, with positional and calibration offsets pre-defined by a session file (.sxs), allowing for real-time-corrected depths. Before deployment, all equipment offsets were measured. During the survey, all swath tracklines were recorded in SWATHplus raw data format (.sxr). A Valeport Mini Sound Velocity Sensor (miniSVS) was attached to the transducer mount and collected continuous speed of sound (SOS) measurements at the depth of the transducers. These values were directly read and incorporated into the SWATHplus raw data format during acquisition providing a real-time speed of sound at the transducer while underway. In addition, a separate Mini Sound Velocity Profiler (Valeport miniSVP) was used to collect speed of sound profiles (water surface to seafloor) approximately every two hours throughout the survey as well as other areas of question such as rapid transitions in water depth.
2016
Jake J. Fredericks
U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
Physical Scientist/Hydrographic Technician
mailing and physical address
600 4th Street South
St. Petersburg
FL
33701
USA
(727) 502-8000
jfredericks@usgs.gov
Swath Bathymetry Processing: Data were collected with SWATHplus-H and Bathyswath 3.10.2.0, an acquisition and initial processing program. Preliminary roll calibration trackline data were collected and processed using Bathyswath Swath Processor version 3.10.2.0 and Bathyswath Grid Processor software version 3.10.0.0. Instrument offsets and calibration values were input into the session file (.sxs) and the raw data files (.sxr) were then processed using the updated system configuration file containing roll calibration values, measured equipment offsets, acquisition parameters, navigation and motion from the F190R+, SOS at the sonar head, and SVP cast data. Calibration offsets and acoustic filtering utilized in Bathyswath was then applied to each raw data file to create a processed data file (.gsf), and then imported into advanced sounding data processing software CARIS HIPS and SIPS (CARIS) version 9.1. The initial real-time processing datum for the swath and backscatter data was WGS84, which is the acquisition datum for Marinestar HP position and navigation data.
Within CARIS, outliers for the navigation data and processed soundings were removed using program filters. Remaining data outliers were then removed manually. Refraction editor was used to correct for sound velocity errors. A CARIS BASE surface with associated CUBE sample surface was created from the edited soundings. A CUBE hypothesis is the estimated value of a grid node representing all the soundings within a chosen resolution 5-meter grid-cell size 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 final visual inspection of the dataset in addition to Quality Assurance and Quality Control (QA/QC) procedures were implemented to ensure outliers and erroneous data points had been removed from the final BASE surface. In order to provide the dataset in a non-proprietary format, the final xyz data were exported as an ASCII comma-separated file.
2016
Chandeleur_Islands_2016_IFB_ITRF08_XYZ.txt
Jake J. Fredericks
U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
Physical Scientist/Hydrographic Technician
mailing and physical address
600 4th Street South
St. Petersburg
FL
33701
USA
(727) 502-8000
jfredericks@usgs.gov
Datum Transformation: The text file Chandeleur_Islands_2016_IFB_ITRF08.txt was converted, using VDatum version 3.6, from ITRF08 to the NAD83 reference frame and NAVD88 orthometric height using the National Geodetic Survey (NGS) geoid model of 2009 (GEOID09).
Chandeleur_Islands_2016_IFB_ITRF08_xyz.txt
2016
Chandeleur_Islands_2016_IFB_NAD83_NAVD88_GEOID09_xyz.txt
Andrew S. Farmer
U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
Physical Scientist/Hydrographic Technician
mailing and physical address
600 4th Street South
St. Petersburg
FL
33701
USA
(727) 502-8000
afarmer@usgs.gov
The 16BIM01 IFB bathymetry trackline files were created from the ITRF08-equivalent (WGS84[G1762]), uncorrected x,y point files collected in Hypack version 14.0.9.47. The geographic data were saved as a Keyhole Markup Language Zipped (.kmz) file and later opened and converted into a layer (.lyr) file within ArcCatalog version 10.3.1. The layer file was then exported as a shapefile in ArcMap version 10.3.1. Using the XTools Pro extension, feature conversion tool, "make polylines from points" the x,y data point shapefile was converted into a polyline shapefile. Another trackline file was created in ArcMap by reprojecting the WGS84(G1762) data to NAD83.
Raw Hypack x,y point files
2016
Chandeleur_Islands_2016_IFB_ITRF08_tracklines.txt
Chandeleur_Islands_2016_IFB_NAD83_tracklines.txt
Added keywords section with USGS persistent identifier as theme keyword.
20201013
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Point
Universal Transverse Mercator
16
0.999600
-87.000000
0.000000
500000.000000
0.000000
coordinate pair
5.000000
5.000000
meters
World Geodetic System of 1984
WGS_1984
6378137.0
298.257223563
WGS84
0.0001
meters
Attribute values
Chandeleur_Islands_2016_IFB_NAD83_NAVD88g09_xyz.txt
ASCII text file containing the processed 5-meter resolution interferometric swath bathymetry xyz 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.
USGS
NAD83_X
NAD83 X-coordinate (easting) of sample point, in meters
USGS
318950.7884
323215.7872
1.0E-4
NAD83_Y
NAD83 Y-coordinate (northing) of sample point, in meters
USGS
3321899.3783
3328234.3770
1.0E-4
Data_Type
IFB = Interferometric Bathymetry; SPCMSC identifier of bathymetry data type.
USGS
IFB
Year
Year data were collected.
USGS
2016
NAVD88g09
NAVD88 (orthometric height) of sample point, in meters with respect to GEOID09.
USGS
-8.7756
-1.6590
1.0E-4
Chandeleur_Islands_2016_IFB_ITRF08_xyz.txt
ASCII text file containing the WGS84(G1762) processed 5-meter resolution interferometric swath bathymetry xyz samples equivalent to the International Terrestrial Reference Frame of 2008 (ITRF08).
USGS
ITRF08_X
ITRF08 X-coordinate (easting) of sample point, in meters.
USGS
318950
323215
1.0E-4
ITRF08_Y
ITRF08 Y-coordinate (northing) of sample point, in meters.
USGS
3321900
3328235
1.0E-4
Ellipsoid
ITRF08 ellipsoid height of sample point, in meters.
USGS
-37.148
-29.89
1.0E-3
Data_Type
IFB = Interferometric Bathymetry; SPCMSC identifier of bathymetry data type.
USGS
Character string - IFB
Year
Year the data were collected.
USGS
2016
Chandeleur_Islands_2016_IFB_NAD83_tracklines.shp
Esri shapefile containing the survey tracklines for the interferometric swath bathymetry transformed to the North American Datum of 1983 (NAD83).
Esri
FID
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Feature geometry.
Esri
Polyline ZM is the geometry type defining the features.
HypackLine
Trackline name assigned by HYPACK acquisition software version 2014.0.9.47. For example, in 001_1640, 001 denotes the line number, and 1640 denotes the time HYPACK started recording the line.
HYPACK
001_1640
031_1556
Trackline
Trackline name assigned by field crew during the survey, these lines represent uncorrected GPS position data associated with each IFB trackline.
USGS
l1f1
l36f2
Data_Type
IFB = Interferometric Bathymetry; SPCMSC identifier of bathymetry data type.
USGS
IFB
Year
Year data were collected.
USGS
2016
Chandeleur_Islands_2016_IFB_ITRF08_tracklines.shp
Esri shapefile containing the survey tracklines for the interferometric swath bathymetry referenced in the International Terrestrial Reference frame of 2008 (ITRF08).
Esri
FID
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Feature geometry.
Esri
Polyline ZM is the geometry type defining the features.
Trackline
Trackline name was assigned by field crew during the survey representing uncorrected GPS position data.
USGS
l1f1
l36f2
HypackLine
Trackline name assigned by HYPACK acquisition software version 2014. For example, in 001_1640, 001 denotes the line number, and 1640 denotes the time HYPACK started recording the line.
HYPACK
001_1640
031_1556
Data_Type
IFB = Interferometric Bathymetry; SPCMSC identifier of bathymetry data type.
USGS
IFB
Year
Year data were collected.
USGS
2016
Jake J. Fredericks
U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
mailing and physical
600 4th Street South
St. Petersburg
FL
33701
USA
(727)502-8000
jfredericks@usgs.gov
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.
ASCII, Shapefile
9.20
XYZ, SHP
https://coastal.er.usgs.gov/data-release/doi-P993MBJK/data/Chandeleur_Islands_2016_IFB_ITRF08_xyz.zip
https://coastal.er.usgs.gov/data-release/doi-P993MBJK/data/Chandeleur_Islands_2016_IFB_NAD83_NAVD88_GEOID09_xyz.zip
https://coastal.er.usgs.gov/data-release/doi-P993MBJK/data/Chandeleur_Islands_2016_IFB_ITRF08_tracklines.zip
https://coastal.er.usgs.gov/data-release/doi-P993MBJK/data/Chandeleur_Islands_2016_IFB_NAD83_tracklines.zip
None
20210923
Andrew S. Farmer
U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
Physical Scientist[FAS22]/Hydrographic Technician
mailing and physical
600 4th Street South
St. Petersburg
FL
33701
USA
(727) 502-8000
afarmer@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998
none
unclassified
None