Chenier_Plain_2017_SBB_ITRF00_Trackline_metadata: Nearshore Single-Beam Bathymetry XYZ Data Collected in 2017 from the Chenier Plain, Louisiana

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Frequently anticipated questions:

What does this data set describe?

Title:
Chenier_Plain_2017_SBB_ITRF00_Trackline_metadata: Nearshore Single-Beam Bathymetry XYZ Data Collected in 2017 from the Chenier Plain, Louisiana
Abstract:
As a part of the Barrier Island Comprehensive Monitoring Program (BICM), scientists from the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center conducted a nearshore single-beam bathymetry survey along the Chenier Plain, Louisiana from Marsh Island to Sabine Pass. The goal of the BICM program is to provide long-term data on Louisiana’s coastline and use this data to plan, design, evaluate, and maintain current and future barrier island restoration projects. The data described in this metadata record will provide baseline bathymetric information for future research investigating island evolution, sediment transport, recent- and long-term geomorphic change and will support modeling of future changes in response to restoration and storm impacts. Over 3,300-line kilometers of single-beam data were acquired during two field missions: USGS Field Activity numbers (FAN) 2017-323-FA, conducted June 2-14, and 2017-324-FA, which occurred July 8-16, 2017 aboard four separate survey vessels. The final x,y,z data are provided in the native World Geodetic System of 1984 (WGS84) G1150 acquisition format (which is equivalent to the International Terrestrial Reference Frame of 2000 [ITRF00]), with values ranging from -26.62 m to -68.94 m ellipsoid height, as well as the North American Datum of 1983 (NAD83) reference frame and the North American Vertical Datum of 1988 (NAVD88) GEOID12A , with values ranging from 0.00 to -30.13 m.
Supplemental_Information:
Trackline files were recorded during the survey, using HYPACK version 16.1.8.0 marine surveying, positioning, and navigation software. For the single-beam bathymetry, the differential global positioning system (DGPS) data were obtained through post processing the base station data to the rover data. This dataset was transformed from the initial ITRF00 datum to NAD83 using the GEOID12A model (NOAA NGS VDatum software version 3.2 - http://vdatum.noaa.gov/).
  1. How might this data set be cited?
    Stalk, Chelsea A., Flocks, James G., Bernier, Julie C., DeWitt, Nancy T., Fredericks, Jake J., Kelso, Kyle W., Farmer, Andrew S., Tuten, Thomas M., and Wilcox, Hunter S., 20180628, Chenier_Plain_2017_SBB_ITRF00_Trackline_metadata: Nearshore Single-Beam Bathymetry XYZ Data Collected in 2017 from the Chenier Plain, Louisiana: U.S. Geological Survey Data Release doi:10.5066/F7CV4GZH, U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -93.8327
    East_Bounding_Coordinate: -91.7455
    North_Bounding_Coordinate: 29.7766
    South_Bounding_Coordinate: 29.4338
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 02-Jun-2017
    Ending_Date: 16-Jul-2017
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: 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 Vector data set. It contains the following vector data types (SDTS terminology):
      • String (1131)
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 15
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -93.0
      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 0.6096
      Ordinates (y-coordinates) are specified to the nearest 0.6096
      Planar coordinates are specified in meters
      The horizontal datum used is WGS84 (G1150) ITRF00.
      The ellipsoid used is WGS84, Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257223563.
  7. How does the data set describe geographic features?
    Chenier_Plain_2017_SBB_ITRF00_Tracklines.shp
    Esri shapefile containing the survey tracklines for the single-beam bathymetry data collected during the 2017 USGS survey of Louisiana's Chenier Plain. (Source: USGS)
    FID
    Internal feature number. (Source: Esri) Sequential unique whole numbers that are automatically generated.
    Length_m
    Length of survey line, in meters (Source: Esri)
    Range of values
    Minimum:123
    Maximum:29197
    Resolution:1
    HypackLine
    Trackline name created by the navigation software, during data collection. The line name consists of prefix (sub-FAN 17BIM01-17BIM08) and an auto-generated line number created by HYPACK. (Source: HYPACK) Survey line name generated by HYPACK at time of survey.
    Data_Type
    The specific type of bathymetry data being collected during the field activity. (Source: USGS) SBB or single-beam bathymetry used by all vessel platforms for this survey.
    Year
    Year the data were collected. (Source: USGS)
    Range of values
    Minimum:2017
    Maximum:2017

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Chelsea A. Stalk
    • James G. Flocks
    • Julie C. Bernier
    • Nancy T. DeWitt
    • Jake J. Fredericks
    • Kyle W. Kelso
    • Andrew S. Farmer
    • Thomas M. Tuten
    • Hunter S. Wilcox
  2. Who also contributed to the data set?
    U.S. Geological Survey, Coastal and Marine Geology Program (SPCMSC), St. Petersburg
  3. To whom should users address questions about the data?
    Cherokee Nation Technologies/U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Attn: Chelsea A. Stalk
    Researcher I
    600 4th Street South
    St. Petersburg, FL
    USA

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

Why was the data set created?

This zip file, Chenier_Plain_2017_SBB_ITRF00_Tracklines.zip, contains Esri trackline vector files for all single-beam bathymetry data collected during two field surveys: Field Activity Numbers (FAN) 2017-323-FA and 2017-324-FA, which encompass data from four separate survey platforms; the R/V Sallenger (17BIM01, 17BIM05), RV Jabba Jaw (17BIM02, 17BIM07), RV Shark (17BIM03, 17BIM07) and the RV Chum (17BIM04, 17BIM08), during the 2017 Chenier Plain survey. Additional survey details are available at https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-323-FA and https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-324-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: 2017 (process 1 of 3)
    Acquisition: The trackline positions for USGS field activities 2017-323-FA and 2017-324-FA were acquired using Ashtech Proflex GPS receiver units streaming position data to the hydrographic software, HYPACK®, a marine surveying, positioning, and navigation software package that managed planned line information and provided real-time navigation, steering, correction, data quality, and instrumentation-status information to the boat operator (HYPACK® version 16.1.8.0). All platforms were equipped with Ashtech Proflex GPS receivers recording 12-channel full-carrier-phase positioning signals (L1/L2) from satellites via Thales Choke-ring antennas (17BIM01, 17BIM02, 17BIM05, 17BIM06) and from smaller Ashtech Global Navigation Satellite Systems (GNSS) antennas (17BIM03, 17BIM04, 17BIM07, 17BIM08). All navigation information was saved into a single raw data file (.raw) in HYPACK®, with each device string referenced by a device identification code and time stamped to Coordinated Universal Time (UTC). Person who carried out this activity:
    Cherokee Nation Technologies/U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Attn: Chelsea A. Stalk
    Researcher I
    600 4th Street South
    St. Petersburg, FL
    U.S.

    (727) 502-8000 (voice)
    cstalk@usgs.gov
    Date: 2017 (process 2 of 3)
    Processing/Shapefile creation: The vector digital dataset (polyline) of the 2017 Chenier Plain survey tracklines was created in Esri ArcGIS version 10.3.1 using the XTools Pro extension, version 12.2 build 2197. The trackline shapefile was created from the post processed x,y,z point data shapefile for each vessel (please see Chenier_Plain_2017_SBB_XYZ_Metadata.txt) using the XTools' feature conversion tool, "make polylines from points". Within XTools' feature conversion selection window, the following items were selected: "group by field selection" was set to use the attribute HypackLine, and the "input feature order - order by field" was set to use the FID attribute. The individual vessel trackline files were then merged to create a comprehensive trackline file. Tracklines are provided in the native format of WGS84 (G1150) ITRF00. Person who carried out this activity:
    Cherokee Nation Technologies/U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Attn: Chelsea A. Stalk
    Researcher I
    600 4th Street South
    St. Petersburg, FL
    U.S.

    (727) 502-8000 (voice)
    cstalk@usgs.gov
    Data sources used in this process:
    • 17BIM01_SBB_Level_03_xxx_ITRF00.txt 17BIM02_SBB_Level_03_xxx_ITRF00.txt 17BIM03_SBB_Level_03_xxx_ITRF00.txt 17BIM04_SBB_Level_03_xxx_ITRF00.txt 17BIM05_SBB_Level_03_xxx_ITRF00.txt 17BIM06_SBB_Level_03_xxx_ITRF00.txt 17BIM07_SBB_Level_03_xxx_ITRF00.txt 17BIM08_SBB_Level_03_xxx_ITRF00.txt
    Data sources produced in this process:
    • Chenier_Plain_2017_SBB_ITRF00_Tracklines.shp
    Date: 13-Oct-2020 (process 3 of 3)
    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?

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

  1. How well have the observations been checked?
    No formal attribute accuracy tests were performed
  2. How accurate are the geographic locations?
    An Ashtech GPS receiver on all survey platforms recorded the 12-channel full-carrier-phase positioning signals (L1/L2) from satellites via a Thales choke-ring antenna (17BIM01, 17BIM02, 17BIM05, 17BIM06) and from smaller Ashtech Global Navigation Satellite Systems (GNSS) antennas (17BIM03, 17BIM04, 17BIM07, 17BIM08). The manufacturer's stated accuracy of the post processed kinematic GPS data is +/- 1 centimeter (cm) in the horizontal plane.
  3. How accurate are the heights or depths?
    The survey tracklines do not include or represent vertical data.
  4. Where are the gaps in the data? What is missing?
    This dataset is considered complete for the information presented, as described in the abstract section. Users are advised to read the rest of the metadata record carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    These datasets are from two field activities with consistent instrument calibrations.

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 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.
  1. Who distributes the data set? (Distributor 1 of 1)
    Chelsea A. Stalk
    Researcher I
    600 4th Street South
    St. Petersburg, FL
    U.S.

    (727) 502-8000 (voice)
    cstalk@usgs.gov
  2. What's the catalog number I need to order this data set? Chenier_Plain_2017_SBB_ITRF00_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 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.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    This shapefile was created for use with Esri ArcGIS software. It may also be viewed with Esri public domain software ArcExplorer or other GIS software capable of importing the data.

Who wrote the metadata?

Dates:
Last modified: 02-Nov-2023
Metadata author:
Cherokee Nation Technologies/U.S. Geological Survey
Attn: Chelsea A. Stalk
Researcher I
600 4th Street South
St. Petersburg, FL
U.S.

(727) 502-8000 (voice)
cstalk@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/Chenier_Plain_2017_SBB_ITRF00_Trackline_metadata.faq.html>
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