Single-Beam Bathymetric Data Collected in 2008 from the Mississippi River Delta Plain, Louisiana

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Frequently anticipated questions:

What does this data set describe?

Title:
Single-Beam Bathymetric Data Collected in 2008 from the Mississippi River Delta Plain, Louisiana
Abstract:
Data release doi:10.5066/P9RIB5GC associated with this metadata record serves as an archive of single-beam bathymetric (SBB) data collected in July 2004 (Madison Bay) and August 2008 (Bully Camp, Point au Chien, Caminada, Fourchon, and Leeville) at six study areas in the Mississippi River Delta Plain (MRDP), Louisiana. Data were collected from historically formed open-water bodies as part of the U.S. Geological Survey’s (USGS) Gulf Coast Subsidence project to provide more extensive spatial coverage than water depths collected only along coring transects in 2002, 2003, 2006, and 2007 (USGS Open-File Reports [OFR] 2005-1216 and 2009-1158). The bathymetric data were used to estimate magnitudes of one-dimensional (vertical) and three-dimensional (volume) accommodation that formed as a result of extensive historical wetland loss in Barataria and Terrebonne Basins in the MRDP. All bathymetric data are provided as x,y,z point data in the projected coordinate system North American Datum of 1983 (NAD83), Universal Transverse Mercator (UTM) Zone 15 North (15N) and all elevations are North American Vertical Datum of 1988 (NAVD88) orthometric heights, derived using the GEOID03 geoid model.
Supplemental_Information:
A limited number of water depths were collected along coring transects at nine study areas in 2002, 2003, 2006, and 2007 (USGS OFRs 2005-1216 and 2009-1158). In 2004 and 2008, SBB data were collected at the Madison Bay, Bully Camp, Point au Chien, Caminada, Fourchon, and Leeville study areas. SBB data were not collected at the Bay St. Elaine, Bayou Perot, DeLarge, or Ironton study areas. These data are scientific in nature and are not to be used for navigation. Bathymetric grids interpolated from these point elevations should be used with caution and should use an appropriate grid cell size based on trackline spacing.
  1. How might this data set be cited?
    Bernier, Julie C., Kelso, Kyle W., and DeWitt, Nancy T., 20190913, Single-Beam Bathymetric Data Collected in 2008 from the Mississippi River Delta Plain, Louisiana: U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -90.50417
    East_Bounding_Coordinate: -90.12687
    North_Bounding_Coordinate: 29.47166
    South_Bounding_Coordinate: 29.16034
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 06-Aug-2008
    Ending_Date: 23-Aug-2008
    Currentness_Reference:
    Ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Tabular digital data, 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):
      • Point (241962)
    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 0.001
      Ordinates (y-coordinates) are specified to the nearest 0.001
      Planar coordinates are specified in Meters
      The horizontal datum used is D North American 1983.
      The ellipsoid used is GRS 1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: North American Vertical Datum of 1988
      Altitude_Resolution: 0.001
      Altitude_Distance_Units: Meters
      Altitude_Encoding_Method: Attribute values
  7. How does the data set describe geographic features?
    08SWL02_BullyCamp_NAD83_NAVD88_G03
    Comma-separated values (.csv) text, Esri shape (.shp), and Keyhole Markup Language (.kml) files containing the processed SBB x,y,z point data for the Bully Camp study area. (Source: USGS)
    08SWL02_Caminada_NAD83_NAVD88_G03
    Comma-separated values (.csv) text, Esri shape (.shp), and Keyhole Markup Language (.kml) files containing the processed SBB x,y,z point data for the Caminada study area. (Source: USGS)
    08SWL02_Fourchon_NAD83_NAVD88_G03
    Comma-separated values (.csv) text, Esri shape (.shp), and Keyhole Markup Language (.kml) files containing the processed SBB x,y,z point data for the Fourchon study area. (Source: USGS)
    08SWL02_Leeville_NAD83_NAVD88_G03
    Comma-separated values (.csv) text, Esri shape (.shp), and Keyhole Markup Language (.kml) files containing the processed SBB x,y,z point data for the Leeville study area. (Source: USGS)
    08SWL02_PointAuChien_NAD83_NAVD88_G03
    Comma-separated values (.csv) text, Esri shape (.shp), and Keyhole Markup Language (.kml) files containing the processed SBB x,y,z point data for the Point au Chien study area. (Source: USGS)
    FID
    Internal feature number (Source: Esri) Sequential unique whole numbers that are automatically generated
    Shape
    Feature geometry (Source: Esri) Geometry type defining the features
    NAD83_X
    X-coordinate (easting) of sample point, in meters (NAD83, UTM zone 15N) (Source: USGS)
    Range of values
    Minimum:742174.137
    Maximum:779396.346
    Units:Meters
    Resolution:0.001
    NAD83_Y
    Y-coordinate (northing) of sample point, in meters (NAD83, UTM zone 15N) (Source: USGS)
    Range of values
    Minimum:3228997.244
    Maximum:3263057.481
    Units:Meters
    Resolution:0.001
    NAVD88G03
    Elevation (orthometric height) of sample point, in meters (NAVD88, GEOID03) (Source: USGS)
    Range of values
    Minimum:-6.017
    Maximum:0.074
    Units:Meters
    Resolution:0.001
    RMS
    Root mean square (RMS) error of sample point, in meters (Source: SANDS)
    Range of values
    Minimum:0.045
    Maximum:0.141
    Units:Meters
    Resolution:0.001
    DataType
    Bathymetric data collection type (Source: USGS)
    ValueDefinition
    SBBsingle-beam bathymetry
    HypackLine
    Trackline number assigned by HYPACK during acquisition (Source: HYPACK) Character string
    Year
    Year data were acquired, in YYYY format (Source: USGS)
    Range of values
    Minimum:2008
    Maximum:2008
    DOY
    Day-of-year (DOY) the data were acquired (Source: USGS)
    Range of values
    Minimum:219
    Maximum:236

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Julie C. Bernier
    • Kyle W. Kelso
    • Nancy T. DeWitt
  2. Who also contributed to the data set?
    U.S. Geological Survey, Coastal and Marine Hazards and Resources Program, St. Petersburg Coastal and Marine Science Center
  3. To whom should users address questions about the data?
    U.S. Geological Survey
    Attn: Julie C. Bernier
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

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

Why was the data set created?

Dissemination of processed SBB bathymetric data collected from the Bully Camp, Point au Chien, Caminada, Fourchon, and Leeville study areas, Louisiana in August 2008 (USGS Field Activity Number [FAN] 08SWL02). The bathymetric data were used to estimate magnitudes of one-dimensional (vertical) and three-dimensional (volume) accommodation that formed as a result of extensive historical wetland loss in Barataria and Terrebonne Basins in the MRDP.

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: 2008 (process 1 of 6)
    GPS Acquisition - Position and elevation data were recorded using an Ashtech Z-Xtreme GPS receiver, which recorded the 12-channel full-carrier-phase positioning signals (L1/L2) from satellites via a choke-ring antenna. GPS data were recorded concurrently throughout the survey at a nearby base station (maximum baseline distance about 11.5 km) using a similar instrument combination. The base receiver and the rover receiver recorded their positions concurrently at 1-second (s) recording intervals throughout the survey. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Kyle W. Kelso
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8000 (voice)
    kkelso@usgs.gov
    Date: 2004 (process 2 of 6)
    SBB Acquisition - The single-beam bathymetric data were collected aboard the 17-foot Research Vessel (R/V) OOID. HYPACK version 6.2, a marine surveying, positioning, and navigation software package, managed the planned-transect information and provided real-time navigation, steering, correction, data quality, and instrumentation-status information to the boat operator. Planned tracklines were spaced approximately 100 m apart at the Bully Camp, Caminada, and Fourchon study areas and approximately 200 m apart at the Leevile and Point au Chien study areas. Depth soundings were recorded at 50-ms intervals using a Marimatech MP35 echosounder system. Data from the GPS receiver and fathometer were recorded in real time and merged into a single raw data file (.RAW) in HYPACK, with each device string referenced by a device identification code and time stamped to UTC. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Kyle W. Kelso
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8000 (voice)
    kkelso@usgs.gov
    Date: 2009 (process 3 of 6)
    GPS Processing - The coordinate values of the GPS base stations are the time-weighted average of values obtained from OPUS. The base station coordinates were imported into GrafNav, version 7.60 (Waypoint Product Group) and the data from the rover GPS were post-processed to the concurrent base-station session data; baseline distances were less than 11.5 km. The DGPS data were processed in the North American Datum of 1983 (NAD83) geodetic datum. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Kyle W. Kelso
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8000 (voice)
    kkelso@usgs.gov
    Date: 2009 (process 4 of 6)
    SBB Processing - The raw bathymetric data and processed DGPS positions were merged using the System for Accurate Nearshore Depth Surveying (SANDS), version 3.1. SANDS is a single-beam acoustic (sounding), GPS-based hydrographic processing software package developed by the USGS for shallow-water bathymetric mapping. Processed ellipsoid elevations were transformed to North American Vertical Datum of 1988 (NAVD88) orthometric elevations using the NGS geoid model of 2003 (GEOID03). The merged, geometrically corrected SBB data were exported as x,y,z point data in the NAD83 (x,y) and NAVD88 GEOID03 (z) datums. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Kyle W. Kelso
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8000 (voice)
    kkelso@usgs.gov
    Date: 2009 (process 5 of 6)
    Quality Control and Quality Assurance (QA/QC) - The processed SBB point data were imported into Esri ArcGIS version 9.2, visually inspected for outliers, and elevation differences at the intersection of crossing tracklines were calculated. Data along tracklines with crossing elevation differences greater than 10 centimeters (cm) were reviewed for processing errors and adjusted or removed from the final dataset. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Kyle W. Kelso
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8000 (voice)
    kkelso@usgs.gov
    Data sources produced in this process:
    • 08SWL02_BullyCamp_NAD83_NAVD88_G03
    • 08SWL02_Caminada_NAD83_NAVD88_G03
    • 08SWL02_Fourchon_NAD83_NAVD88_G03
    • 08SWL02_Leeville_NAD83_NAVD88_G03
    • 08SWL02_PointAuChien_NAD83_NAVD88_G03
    Date: 13-Oct-2020 (process 6 of 6)
    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?
    Morton, R.A., Bernier, J.C., Barras, J.A., and Ferina, N.F., 2005, Rapid subsidence and historical wetland loss in the Mississippi Delta Plain: likely causes and future implications: U.S. Geological Survey Open-File Report 2005-1216.

    Online Links:

    Morton, R.A., Bernier, J.C., and Kelos, K.W., 2009, Recent subsidence and erosion at diverse wetland sites in the southeastern Mississippi delta plain: U.S. Geological Survey Open-File Report 2009-1158.

    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 processed data is determined during data collection. Offsets between the single-beam transducer and the Geographic Positioning System (GPS) antenna reference point (ARP) were measured during the survey and accounted for in post-processing. Bar checks were performed as calibration efforts to account for any drift in the Marimatech Echosounder. Differential Global Positioning System (DGPS) coordinates were obtained using post-processing software packages (National Geodetic Survey On-Line Positioning User Service [OPUS] and Waypoint Product Group GrafNav, version 7.60).
  2. How accurate are the geographic locations?
    All static base station sessions were processed through the On-Line Positioning User Service (OPUS) maintained by the National Geodetic Survey (NGS). The OPUS base-station solutions were entered into a spreadsheet to compute a final, time-weighted positional coordinate (latitude, longitude, and ellipsoid height). Base-station positional error was calculated as the absolute value of the final weighted solution minus the session position value. The maximum horizontal error of the base station coordinates used for post-processing was 0.00279 seconds latitude and 0.00061 seconds longitude.
  3. How accurate are the heights or depths?
    All static base station sessions were processed through OPUS. The OPUS base-station solutions were entered into a spreadsheet to compute a final, time-weighted positional coordinate (latitude, longitude, and ellipsoid height). Base-station positional error for each GPS session was calculated as the absolute value of the final weighted solution minus the session position value. For this survey, the standard deviation of the base station ellipsoid height was 0.006 meters (m) and the maximum vertical error for the base station was +/- 0.021 m.
  4. Where are the gaps in the data? What is missing?
    Data release doi:10.5066/P9RIB5GC associated with this metadata record includes the processed SBB position and elevation data for 241,962 point locations collected from Barataria and Terrebonne Basins in the MRDP, Louisiana in August 2008 (USGS FAN 08SWL02).
  5. How consistent are the relationships among the observations, including topology?
    Bathymetric soundings were recorded using a Marimatech E-Sea MP35 echosounder system. Position and elevation data were recorded using an Ashtech Z-Xtreme GPS receiver and choke-ring antenna. GPS data were recorded concurrently throughout the survey at nearby base stations using a similar instrument combination. The final point (xyz) data are the result of merging the post-processed DGPS position data with the sounding data using the software package System for Accurate Nearshore Depth Surveying (SANDS), version 3.1.

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 acknowledged 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)
    U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
    Attn: Julie C. Bernier
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8000 (voice)
    jbernier@usgs.gov
  2. What's the catalog number I need to order this data set? Downloadable data
  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, or for general or scientific purposes, 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?
    • Availability in digital form:
      Data format: This zip archive includes comma-separated values text files (.csv), GIS data files in Esri shapefile (.shp) and Keyhole Markup Language (KML) formats, and accompanying metadata for SBB data collected in 2008 from Barataria and Terrebonne basins in the MRDP, Louisiana (USGS FAN 08SWL02). in format Compressed (zip) archive Multimedia presentation Size: 18
      Network links: https://coastal.er.usgs.gov/data-release/doi-P9RIB5GC/data/08SWL02_SBB_xyz.zip
    • Cost to order the data: None, if obtained online

  5. What hardware or software do I need in order to use the data set?
    GIS files can be opened using the free ArcGIS Explorer or Google Earth GIS viewers.

Who wrote the metadata?

Dates:
Last modified: 13-Oct-2020
Metadata author:
U.S. Geological Survey
Attn: Julie C. Bernier
Geologist
600 4th Street South
St. Petersburg, FL
USA

727-502-8000 (voice)
jbernier@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/08SWL02-met.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:18:28 2021