Coastal Bathymetry Data Collected in 2016 from the Chandeleur Islands, Louisiana–Single Beam Bathymetry Soundings (XYZ)

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Frequently anticipated questions:

What does this data set describe?

Title:
Coastal Bathymetry Data Collected in 2016 from the Chandeleur Islands, Louisiana–Single Beam Bathymetry Soundings (XYZ)
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 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).
Supplemental_Information:
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.
  1. How might this data set be cited?
    Farmer, Andrew S., Fredericks, Jake J., Miselis, Jennifer L., Buster, Noreen A., DeWitt, Nancy T., Kelso, Kyle W., Stalk, Chelsea A., and Reynolds, B.J., 20181115, Coastal Bathymetry Data Collected in 2016 from the Chandeleur Islands, Louisiana–Single Beam Bathymetry Soundings (XYZ): U.S. Geological Survey Data Release doi:10.5066/P993MBJK, U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -88.911846
    East_Bounding_Coordinate: -88.763295
    North_Bounding_Coordinate: 30.069540
    South_Bounding_Coordinate: 29.867372
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 10-Jun-2016
    Ending_Date: 19-Jun-2016
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: tabular and vector digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Point data set.
    2. What coordinate system is used to represent geographic features?
      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 coordinates are encoded using Coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.1
      Ordinates (y-coordinates) are specified to the nearest 0.1
      Planar coordinates are specified in meter
      The horizontal datum used is World Geodetic System of 1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257223563.
      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: WGS84
      Depth_Resolution: 0.01
      Depth_Distance_Units: meter
      Depth_Encoding_Method: Implicit coordinate
  7. How does the data set describe geographic features?
    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). (Source: USGS)
    ITRF08_X
    ITRF08 X-coordinate (easting) of sample point, in meters (Source: VDatum)
    Range of values
    Minimum:315714.6458
    Maximum:329698.4017
    ITRF08_Y
    ITRF08 Y-coordinate (northing) of sample point, in meters (Source: VDatum version 3.6)
    Range of values
    Minimum:3305617.7307
    Maximum:3327806.9636
    Ellipsoid
    ITRF08 ellipsoid height of sample point, in meters (Source: VDatum version 3.6)
    Range of values
    Minimum:-41.6117
    Maximum:-28.2127
    ITRF08_Lat
    ITRF08 latitude coordinate of sample point, in decimal degrees (Source: VDatum version 3.6)
    Range of values
    Minimum:29.867795
    Maximum:30.068869
    ITRF08_Lon
    ITRF08 longitude coordinate of sample point, in decimal degrees (Source: VDatum version 3.6)
    Range of values
    Minimum:-88.911067
    Maximum:-88.764794
    Year
    The year the data were collected. (Source: USGS) 2016
    DOY
    Day of year of the sample point. (Source: CARIS)
    Range of values
    Minimum:164
    Maximum:167
    UTC
    Coordinated Universal Time (UTC) of the sample point in hours, minutes, and decimal seconds (HH:MM:SS.sss) (Source: USGS)
    Range of values
    Minimum:08:15:44.325
    Maximum: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. (Source: HYPACK)
    Range of values
    Minimum:001_1256
    Maximum:071_1324
    GPS_Week
    The Satellite derived GPS week of sample point (Source: CARIS) 1901
    GPS_Second
    The GPS second of sample point (Source: CARIS)
    Range of values
    Minimum:46251.297
    Maximum:319343.458
    Data_Type
    Type of bathymetric data (Source: 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). (Source: VDatum version 3.6)
    FID
    Internal feature number. (Source: Esri) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: Esri) Point ZM is the geometry type defining the features.
    Year
    The year the data were collected. (Source: 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. (Source: HYPACK)
    Range of values
    Minimum:001_1256
    Maximum:071_1324
    NAD83_X
    NAD83 X-coordinate (easting) of sample point, in meters (Source: VDatum version 3.6)
    Range of values
    Minimum:315715.4209
    Maximum:329699.1733
    NAD83_Y
    NAD83_Y-coordinate (northing) of sample point, in meters (Source: VDatum version 3.6)
    Range of values
    Minimum:3305617.1129
    Maximum:3327806.3405
    NAVD88g09
    The Z-coordinate of the sample point in NAVD88, using the GEOID09 model (orthometric height), in meters. (Source: VDatum version 3.6)
    Range of values
    Minimum:-13.6743
    Maximum:-0.3701
    UTM_Zone
    The UTM zone number (Source: VDatumn) 16
    Data_Type
    The data type of the xyz point - SBB (Single Beam Bathymetry) (Source: 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. (Source: Esri)
    FID
    Internal feature number. (Source: Esri) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: 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. (Source: HYPACK)
    Range of values
    Minimum:001_1256
    Maximum:071_1324
    Length_m
    Length of survey line, in meters. (Source: Esri)
    Range of values
    Minimum:0.401709
    Maximum:21869.762633
    Units:meters
    Resolution: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. (Source: Esri)
    FID
    Internal feature number. (Source: Esri) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: 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. (Source: HYPACK 2014)
    Range of values
    Minimum:001_1256
    Maximum:071_1324
    Length_m
    Length of survey line, in meters. (Source: Esri)
    Range of values
    Minimum:0.401709
    Maximum:21869.762633
    Units:meters
    Resolution:0.01

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Andrew S. Farmer
    • Jake J. Fredericks
    • Jennifer L. Miselis
    • Noreen A. Buster
    • Nancy T. DeWitt
    • Kyle W. Kelso
    • Chelsea A. Stalk
    • B.J. Reynolds
  2. Who also contributed to the data set?
    U.S. Geological Survey, Coastal and Marine Geology Program, St. Petersburg Coastal and Marine Science Center
  3. To whom should users address questions about the data?
    Andrew S. Farmer
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Physical Scientist/Hydrographic Technician
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    afarmer@usgs.gov

Why was the data set created?

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.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 2016 (process 1 of 8)
    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). Person who carried out this activity:
    Andrew S. Farmer
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Physical Scientist/Hydrographic Technician
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    afarmer@usgs.gov
    Date: 2016 (process 2 of 8)
    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). Person who carried out this activity:
    Andrew S. Farmer
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Physical Scientist/Hydrographic Technician
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    afarmer@usgs.gov
    Data sources produced in this process:
    • HYPACK raw data files (.raw), HYPACK target files (.tgt), and SVP files (.txt, *.csv, *.svp).
    Date: 2016 (process 3 of 8)
    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. Person who carried out this activity:
    Andrew S. Farmer
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Physical Scientist/Hydrographic Technician
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    afarmer@usgs.gov
    Data sources produced in this process:
    • Post-processed differential navigation data for the rover (boat) in ASCII text format.
    Date: 2016 (process 4 of 8)
    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. Person who carried out this activity:
    Andrew S. Farmer
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Physical Scientist/Hydrographic Technician
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    afarmer@usgs.gov
    Data sources used in this process:
    • 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.
    Data sources produced in this process:
    • 16BIM02_SBB_Level_03_ITRF00.txt
    Date: 2016 (process 5 of 8)
    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. Person who carried out this activity:
    Andrew S. Farmer
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Physical Scientist/Hydrographic Technician
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    afarmer@usgs.gov
    Data sources used in this process:
    • 16BIM02_SBB_Level_03_ITRF00.txt
    Data sources produced in this process:
    • 16BIM02_SBB_Level_03_ITRF00_forVdatum.txt
    Date: 2016 (process 6 of 8)
    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. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Andrew S. Farmer
    Physical Scientist/Hydrographic Technician
    600 4th Street South
    St. Petersburg, FL
    U.S.

    (727) 502-8000 (voice)
    afarmer@usgs.gov
    Data sources used in this process:
    • 16BIM02_SBB_Level_03_ITRF00_forVdatum.txt
    Data sources produced in this process:
    • Chandeleur_Islands_2016_SBB_ITRF08_xyz.txt Chandeleur_Islands_2016_SBB_NAD83_NAVD88G09_xyz.txt
    Date: 2016 (process 7 of 8)
    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. Data sources used in this process:
    • Chandeleur_Islands_2016_SBB_ITRF08_xyz.txt
    • Chandeleur_Islands_2016_SBB_NAD83_NAVD88G09_xyz.txt
    Data sources produced in this process:
    • Chandeleur_Islands_2016_SBB_ITRF08_tracklines.txt
    • Chandeleur_Islands_2016_SBB_NAD83_tracklines.txt
    Date: 13-Oct-2020 (process 8 of 8)
    Added keywords section with USGS persistent identifier as theme keyword. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
  3. What similar or related data should the user be aware of?
    Fredericks, Jake J., Buster, Noreen A., DeWitt, Nancy T., Kelso, Kyle W., and Miselis, Jennifer L., 20161221, Coastal Interferometric Swath Bathymetry Data Collected in 2015 from the Chandeleur Islands, Louisiana: U.S. Geological Survey Data Release doi:10.5066/F7NV9GC8.

    Online Links:

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    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).
  2. How accurate are the geographic locations?
    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.
  3. How accurate are the heights or depths?
    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.
  4. Where are the gaps in the data? What is missing?
    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.
  5. How consistent are the relationships among the observations, including topology?
    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.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None.
Use_Constraints:
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.
  1. Who distributes the data set? (Distributor 1 of 1)
    Andrew S. Farmer
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    afarmer@usgs.gov
  2. What's the catalog number I need to order this data set? 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
  3. What legal disclaimers am I supposed to read?
    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.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 23-Sep-2021
Metadata author:
Andrew S. Farmer
U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
Physical Scientist/Hydrographic Technician
600 4th Street South
St. Petersburg, FL
USA

(727) 502-8000 (voice)
afarmer@usgs.gov
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/Chandeleur_Islands_2016_SBB_ITRF08_NAD83_NAVD88_GEOID09_xyz_metadata.faq.html>
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