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–Single Beam 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 229-line kilometers (km) of processed single beam bathymetry (SBB) data collected under Field Activity Number (FAN) 2016-335-FA. This FAN encompasses two subfans each of which represents one survey vessel; the RV Sallenger (subfan 16BIM01) and the RV Jabba Jaw (subFAN 16BIM02). SBB and IFB point data (x,y,z) 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 Digital Elevation Model (DEM).
The SBB zip archives contain processed sounding point data (xyz) and trackline shapefiles collected in June 2016 (FAN 2016-335-FA; subFAN 16BIM02) around the Chandeleur Islands, Louisiana. The processed single beam soundings are provided in comma delimited American Standard Code for Information Interchange (ASCII) format. Additional survey and data details are available at https://cmgds.marine.usgs.gov/fan_info.php?fan=2016-335-FA.
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 referenced to the World Geodetic System of 1984 (WGS84 [G1150]), which is equivalent to the International Terrestrial Reference Frame of 2000 (ITRF00). The final SBB x,y,z position data from this survey were transformed from the acquisition datum, ITRF00, to the International Terrestrial Reference Frame of 2008 (ITRF08) so they could be merged with the concurrently-collected IFB data. The final, combined bathymetry dataset consisted of a single x,y,z point file that was subsequently used to create the interpolated DEM, Chandeleur_Islands_2016_SBB_and_IFB_NAD83_NAVD88_GEOID09_50_DEM.tif.
20160610
20160619
ground condition
None planned
-88.911846
-88.763295
30.069540
29.867372
USGS Metadata Identifier
USGS:1037e38a-07e6-418d-9654-932d5a5fa71d
ISO 19115 Topic Category
oceans
elevation
location
geoscientificInformation
imageryBaseMapsEarthCover
USGS Thesaurus
marine geology
geophysics
bathymetry
single-beam echo sounder
navigational data
digital elevation models
field monitoring stations
None
trackline
USGS
shapefile
HYPACK
single beam bathymetry
single beam
base station
Chandeleur Islands benchmark stamping CTMP
kinematic
datum
shoreline
hydrography
ODOM Echotrach CV-100
ODOM
TSS Motion Sensor
echosounder
St. Petersburg Coastal and Marine Science Center
SPCMSC
geophysical
Barrier Island Evolution Research Project
Barrier Island Mapping
16BIM02
2016-335-FA
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. 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.
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
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 ArcCatalog 10.3.1
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 is determined during data collection. The SBB data were collected during one research effort in June 2016 (USGS FAN 2016-335-FA, subFAN 16BIM02), utilized one vessel and are therefore internally consistent. During mobilization, each piece of equipment was isolated to obtain internal and external offset measurements with respect to the survey platform. DGPS was always implemented for navigational accuracy in post-processing. These bathymetric data have not been independently verified for accuracy. For the SBB, offsets between the single beam transducers, the Ashtech antenna reference point (ARP), and the vessel motion units were measured and accounted for on the platform. 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).
This file consists of the post-processed bathymetric data (x,y,z) (subFAN 16BIM02) and represents data coverage for the single beam portion of the 2016 nearshore survey (USGS FAN 2016-335-FA) from the Chandeleur Islands, Louisiana. Refer to the supplemental information section of the data release for field logs, vessel platform descriptions, and other survey information.
These are complete post-processed x,y,z bathymetric data points from acoustic single beam data collected in June 2016, near the northeastern region of the Chandeleur Islands, Louisiana.
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 the On-Line Positioning User Service (OPUS) which is maintained by the 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.
0.00030
The range of error for base station CTMP is 0.00030 longitude decimal seconds.
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 the 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.
GPS Acquisition: A USGS-installed benchmark, CTMP, was occupied on the northern Chandeleur Islands. The base was equipped with an Ashtech ProFlex GPS receiver, which recorded the 12-channel full-carrier-phase positioning signals (L1/L2) from satellites via the Thales choke-ring antenna at a rate of 2 times per second. GPS instrumentation on the rover vessel recorded concurrently at 2 times per second. The GPS navigation data were acquired and processed in the current realization of WGS84 (G1150).
2016
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
Single Beam Bathymetry Acquisition: Depth soundings were acquired aboard the vessel at 100-milliseconds (ms) using an Odom CV100 echo sounder system with a 200 kilohertz (kHz) transducer. Boat motion was recorded on the R/V Jabba Jaw (16BIM02) using a TSS motion sensor. All sensor data were combined and saved into a single raw data file (.raw) in HYPACK version 2014, with each device string referenced by a device identification code and time stamped to Coordinated Universal Time (UTC). Sound velocity measurements were collected using a Sontek Castaway CTD unit to record changes in water column speed of sound (SOS).
2016
HYPACK raw data files (.raw), HYPACK target files (.tgt), and SVP files (.txt, *.csv, *.svp).
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
Differentially corrected navigation processing: The coordinate values of the GPS base station, CTMP, are the time-weighted average of values obtained from OPUS. These coordinates were entered into the post-processing software, GrafNav version 8.6. The kinematic GPS data from the survey vessel was then processed to the static GPS data from the CTMP base station. Steps were taken to ensure that the trajectories between the base and rover were clean and resulted in fixed positions. GPS data quality was monitored and maintained by analyzing the graphs, trajectory maps, and processing logs that GrafNav produces for each GPS session. If poor GPS data points were identified during the quality assurance/quality control (QA/QC) process, some common tools used to improve the solution were utilized. These options included, but were not limited to, omitting a satellite flagged as poor in health, excluding time-segments with cycle slips, or adjusting the satellite elevation mask angle. The final, differentially-corrected, precise DGPS positions were computed for the roving vessel’s recording rate, and then exported in ASCII text format. The exported ASCII file subsequently replaced the uncorrected real-time rover positions (recorded at the time of acquisition in ITRF00) during post-processing. The GPS data were processed and exported in WGS84 (G1150), which is equivalent to ITRF00, and ellipsoid height in meters.
2016
Post-processed differential navigation data for the rover (boat) in ASCII text format.
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
Single beam bathymetry processing: All data were processed using CARIS HIPS and SIPS (Hydrographic Information Processing System and Sonar Information Processing System) version 9.1. The raw HYPACK data files were imported into CARIS. The differentially corrected navigation files were imported using the generic data parser tool within CARIS, and any SVP profile casts were imported and applied. The bathymetric data components (position, motion, depth, and SOS) were then merged and geometrically corrected to produce processed x,y,z data. Next, the data were edited for outliers and then further reviewed in the Subset Editor utility for crossing status and questionable data points or areas. The geometrically corrected point data were then exported as an x,y,z ASCII text file referenced to WGS84 (G1150), which is equivalent to ITRF00, and ellipsoid height in meters. The exported ASCII files from the vessel were later combined with the IFB data file for further QA/QC.
Post-processed differential navigation data files (*.txt), HYPACK RAW bathymetric data files (*.RAW), HYPACK target (.tgt) files, and SVP files (.txt, *.csv, *.svp) files all in ASCII text format.
2016
16BIM02_SBB_Level_03_ITRF00.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
Single beam bathymetry error analysis: The ASCII files described in the previous step were imported into ArcMap version 10.3 and reviewed for outliers. An Esri ArcMap add-in program script was written locally, by USGS staff, to evaluate the elevation differences at the intersection of crossing lines. If discrepancies were found at a crossing, the source of the discrepancy was identified and, if needed, the line or segment of data points in error was statically adjusted or removed. This process was reiterated again to produce a final assessment of the crossing range for the SBB dataset.
16BIM02_SBB_Level_03_ITRF00.txt
2016
16BIM02_SBB_Level_03_ITRF00_forVdatum.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
VDatum version 3.6 transformation: The SBB data were transformed two times, using VDatum. The vertical transformation errors reported by VDatum are the following: 1) Transformation from ITRF00 to NAD83, NAVD88 with respect to GEOID09 is 0.076158 m or 7.6158 cm and 2) Transformation from ITRF00 to ITRF08 is 0.000 m or 0.00 cm.
16BIM02_SBB_Level_03_ITRF00_forVdatum.txt
2016
Chandeleur_Islands_2016_SBB_ITRF08_xyz.txt
Chandeleur_Islands_2016_SBB_NAD83_NAVD88G09_xyz.txt
U.S. Geological Survey
Andrew S. Farmer
Physical Scientist/Hydrographic Technician
Mailing and physical
600 4th Street South
St. Petersburg
FL
33701
U.S.
(727) 502-8000
afarmer@usgs.gov
The 16BIM02 trackline files were created in Esri ArcGIS version 10.3.1 from the x,y,z point files by converting the x,y,z data into shapefiles. Using the XTools Pro extension, version 11.1 feature conversion tool, "make polylines from points" the x,y,z data point shapefile was converted into a polyline shapefile. This was repeated for both datum transformations, ITRF08 and NAD83 for the data release.
Chandeleur_Islands_2016_SBB_ITRF08_xyz.txt
Chandeleur_Islands_2016_SBB_NAD83_NAVD88G09_xyz.txt
2016
Chandeleur_Islands_2016_SBB_ITRF08_tracklines.txt
Chandeleur_Islands_2016_SBB_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
0.9996
-87.000000
0.0
500000.0
0.0
Coordinate pair
0.1
0.1
meter
World Geodetic System of 1984
WGS_1984
6378137.0
298.257223563
WGS84
0.01
meter
Implicit coordinate
Chandeleur_Islands_2016_SBB_ITRF08_xyz.txt
ASCII text file containing the processed single beam bathymetry x,y,z point data in the International Terrestrial Reference Frame of 2008 (ITRF08), which is equivalent to WGS84(G1762).
USGS
ITRF08_X
ITRF08 X-coordinate (easting) of sample point, in meters
VDatum
315714.6458
329698.4017
ITRF08_Y
ITRF08 Y-coordinate (northing) of sample point, in meters
VDatum version 3.6
3305617.7307
3327806.9636
Ellipsoid
ITRF08 ellipsoid height of sample point, in meters
VDatum version 3.6
-41.6117
-28.2127
ITRF08_Lat
ITRF08 latitude coordinate of sample point, in decimal degrees
VDatum version 3.6
29.867795
30.068869
ITRF08_Lon
ITRF08 longitude coordinate of sample point, in decimal degrees
VDatum version 3.6
-88.911067
-88.764794
Year
The year the data were collected.
USGS
2016
DOY
Day of year of the sample point.
CARIS
164
167
UTC
Coordinated Universal Time (UTC) of the sample point in hours, minutes, and decimal seconds (HH:MM:SS.sss)
USGS
08:15:44.325
17:57:26.963
HypackLine
Trackline name assigned by HYPACK acquisition software version 2014. For example, in 001_1256, 001 denotes the line number, and 1256 denotes the computer clock time (UTC) HYPACK started recording the line. A few lines have an additional extension of _*_*_0001, *_*_0002, or *_*_0003. This resulted from program performance issues in HYPACK during the survey.
HYPACK
001_1256
071_1324
GPS_Week
The Satellite derived GPS week of sample point
CARIS
1901
GPS_Second
The GPS second of sample point
CARIS
46251.297
319343.458
Data_Type
Type of bathymetric data
USGS
SBB
Chandeleur_Islands_2016_SBB_NAD83_NAVD88_GEOID09_xyz.txt
ASCII text file containing the processed single beam bathymetry x,y,z point data in the North American Datum of 1983 (NAD83) and the North American Vertical Datum of 1988 (NAVD88) with respect to the geoid model of 2009 (GEOID09).
VDatum version 3.6
FID
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Feature geometry.
Esri
Point ZM is the geometry type defining the features.
Year
The year the data were collected.
USGS
2016
HypackLine
Trackline name assigned by HYPACK acquisition software version 2014. For example, in 001_1256, 001 denotes the line number, and 1256 denotes the time HYPACK started recording the line. A few lines have an additional extension of _*_*_0001, *_*_0002, or *_*_0003. This resulted from program performance issues in HYPACK during the survey.
HYPACK
001_1256
071_1324
NAD83_X
NAD83 X-coordinate (easting) of sample point, in meters
VDatum version 3.6
315715.4209
329699.1733
NAD83_Y
NAD83_Y-coordinate (northing) of sample point, in meters
VDatum version 3.6
3305617.1129
3327806.3405
NAVD88g09
The Z-coordinate of the sample point in NAVD88, using the GEOID09 model (orthometric height), in meters.
VDatum version 3.6
-13.6743
-0.3701
UTM_Zone
The UTM zone number
VDatumn
16
Data_Type
The data type of the xyz point - SBB (Single Beam Bathymetry)
USGS
SBB
Chandeleur_Islands_2016_SBB_ITRF08_tracklines.shp
Esri shapefile containing the survey tracklines for the single beam bathymetry data collected in June 2016 from the northern Chandeleur Islands, Louisiana, during USGS FAN 2016-335-FA subFAN 16BIM02. File 16BIM02_SBB_ITRF08_tracklines.shp is projected in WGS84(G1762), which is equivalent to ITRF08. A vertical component does not exist for these files.
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. For example, in 001_1256, 001 denotes the line number, and 1256 denotes the time HYPACK started recording the line. A few lines have an additional extension of *_*_0001, *_*_0002, or *_*_0003. This resulted from program performance issues in HYPACK during the survey.
HYPACK
001_1256
071_1324
Length_m
Length of survey line, in meters.
Esri
0.401709
21869.762633
meters
0.01
Chandeleur_Islands_2016_SBB_NAD83_tracklines.shp
Esri shapefile containing the survey tracklines for the single beam bathymetry data collected in June 2016 Northern Chandeleur Islands, Louisiana during USGS FAN 2016-335-FA subFAN 16BIM02. File Chandeleur_Islands_2016_SBB_NAD83_tracklines.shp is projected in NAD83, UTM Zone 16N. A vertical component does not exist for these files.
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 was assigned by HYPACK-A Xylem Brand acquisition software version 2014. For example, in 001_1256, 001 denoted the line number, and *_1256 denoted the time HYPACK started recording the line. A few lines have an additional extension of _*_*_0001, *_*_0002, or *_*_0003. This resulted from program performance issues in HYPACK during the survey.
HYPACK 2014
001_1256
071_1324
Length_m
Length of survey line, in meters.
Esri
0.401709
21869.762633
meters
0.01
Andrew S. Farmer
U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
Geologist
mailing and physical address
600 4th Street South
St. Petersburg
FL
33701
USA
(727) 502-8000
afarmer@usgs.gov
Chandeleur_Islands_2016_SBB_ITRF08_xyz.txt
Chandeleur_Islands_2016_SBB_NAD83_NAVD88_GEOID09_xyz.txt
Chandeleur_Islands_2016_SBB_ITRF08_tracklines.shp
Chandeleur_Islands_2016_SBB_NAD83_tracklines.shp
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.
ASCII, Shapefile
9.20
XYZ, SHP
https://coastal.er.usgs.gov/data-release/doi-P993MBJK/data/Chandeleur_Islands_2016_SBB_ITRF08_xyz.zip
https://coastal.er.usgs.gov/data-release/doi-P993MBJK/data/Chandeleur_Islands_2016_SBB_NAD83_NAVD88_GEOID09_xyz.zip
https://coastal.er.usgs.gov/data-release/doi-P993MBJK/data/Chandeleur_Islands_2016_SBB_ITRF08_tracklines.zip
https://coastal.er.usgs.gov/data-release/doi-P993MBJK/data/Chandeleur_Islands_2016_SBB_NAD83_tracklines.zip
None
20210923
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
FGDC Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998
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.
none
unclassified
None