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What does this data set describe?

Title: CatIsland_2010_Bathy_Swath_tracklines
In September and October of 2010, the U.S. Geological Survey (USGS), in cooperation with the Army Corps of Engineers (USACE), conducted geophysical surveys around Cat Island, Miss. to collect bathymetry, acoustical backscatter, and seismic reflection data (seismic-reflection data have been published separately, Forde and others, 2012). The geophysical data along with sediment vibracore data (yet to be published) will be integrated to analyze and produce a report describing the geomorphology and geologic evolution of Cat Island. Interferometric swath bathymetry, and acoustical backscatter data were collected aboard the RV G.K. Gilbert during the first cruise which took place September 7-15, 2010. Single-beam bathymetry was collected in very shallow water around the island aboard the RV Streeterville from September 28 through October 2, 2010 to bridge the gap between the landward limit of the previous cruise and the shoreline. The survey area extended from the nearshore to approximately 5 kilometers (km) offshore to the north, south, and west, and approximately 2 km to the east. This report archives bathymetry and acoustical backscatter data and provides information and mapping products essential for completion of the project goals. The bathymetry will provide elevations and show geomorphic characteristics of the seafloor, while the backscatter and acoustical backscatter imagery will enhance the geomorphic characteristics and give insight to variations of sediment types on the seafloor. This file contains the trackline locations and names for swath bathymetry and acoustic backscatter data around Cat Island, Miss.
Trackline files were recorded using HYPACK software during the survey.
  1. How might this data set be cited?
    Buster, Noreen A., Pfeiffer, William R., U.S. Geological Survey, and Wiese, Dana S., 20110131, CatIsland_2010_Bathy_Swath_tracklines: U.S. Geological Survey Data Series 739.

    Online Links:

    This is part of the following larger work.

    Buster, Noreen A., Pfeiffer, William R., Miselis, Jennifer L., Kindinger, Jack L., Wiese, Dana S., and Reynolds, B.J., 20101001, Bathymetry and Acoustic Backscatter Data Collected in 2010 from Cat Island, Mississippi: U.S. Geological Survey Data Series 739, U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center, St. Petersburg, Florida.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -89.203208
    East_Bounding_Coordinate: -89.033595
    North_Bounding_Coordinate: 30.295342
    South_Bounding_Coordinate: 30.162002
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2010
    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 (84)
    2. What coordinate system is used to represent geographic features?
      The map projection used is Transverse Mercator.
      Projection parameters:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -87.0
      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 0.000000002220024164500956
      Ordinates (y-coordinates) are specified to the nearest 0.000000002220024164500956
      Planar coordinates are specified in Meter
      The horizontal datum used is D WGS 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.
  7. How does the data set describe geographic features?
    lines (Source: Swath survey tracklines)
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Feature geometry. (Source: ESRI) Coordinates defining the features.
    Feature geometry. (Source: ESRI) Line number in survey
    text. (Source: ESRI) Year survey completed

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Noreen A. Buster
    • William R. Pfeiffer
    • U.S. Geological Survey
    • Dana S. Wiese
  2. Who also contributed to the data set?
    U.S. Geological Survey, Noreen A. Buster, William R. Pfeiffer, Jennifer L. Miselis, Jack L. Kindinger, Dana S. Wiese, and B.J. Reynolds
  3. To whom should users address questions about the data?
    U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
    Attn: Noreen A. Buster
    600 4th Street South
    St. Petersburg, FL

    (727) 803-8747 x3114 (voice)

Why was the data set created?

This file includes all survey tracklines for the interferometry swath bathymetry data collected around Cat Island, MS in September 2010 by the U.S. Geological Survey (USGS), St. Petersburg Coastal and Marine Science Center. It serves as the bathymetry part of an archive of data for the entire project.

How was the data set created?

  1. From what previous works were the data drawn?
    Cat Island 2010 Bathymetry (source 1 of 1)
    U.S. Geological Survey, 20120415, Cat Island 2010 Bathymetry.

    Type_of_Source_Media: None
    Source_Contribution: Swath bathymetry
  2. How were the data generated, processed, and modified?
    Date: 18-Sep-2010 (process 1 of 4)
    GPS acquisition: A GPS base station was erected within approximately 20 to 30 km of the survey area on a pre-existing National Geodetic Survey (NGS) benchmark at Point Cadet, Miss. GPS data were recorded using Ashtech Z-Xtreme GPS receivers that record the 12-channel full-carrier-phase positioning signals (L1/L2) from the satellites via the Thales choke-ring antenna. This GPS instrument combination is duplicated on the survey vessel (rover). The base receiver and the rover receiver record their positions concurrently at 1-second (s) recording intervals throughout the survey period. Person who carried out this activity:
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Attn: Noreen A. Buster
    600 4th Street South
    St. Petersburg, FL

    (727) 803-8747 x3114 (voice)
    Date: 18-Nov-2011 (process 2 of 4)
    Trackline files were saved and exported from HYPACK and imported into ESRI ArcGIS 10 as point files. The point files were converted to line files, edited, and line names were added to the attribute field.
    Date: 26-Mar-2018 (process 3 of 4)
    Keywords section of metadata optimized by adding theme keyword thesauri and associated keywords. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Arnell S. Forde
    600 4th Street South
    St. Petersburg, FL

    727-502-8000 (voice)
    Date: 13-Oct-2020 (process 4 of 4)
    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)
  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?
    The positional accuracy of the tracklines is determined by the navigational data for the survey. These trackline data have not been independently verified for accuracy.
  2. How accurate are the geographic locations?
    All static base station sessions were run through On-Line Positioning User Service (OPUS) maintained by the National Oceanic and Atmospheric Administration (NOAA) and the National Geodetic Survey (NGS). The base location results from OPUS were put in a spreadsheet to compute final values and error analysis. Using the OPUS values for each day and the total time that data were collected each day, the average weighted values were calculated for each day for latitude and longitude (so the longer occupation times held more value than the shorter times). The final value for latitude and longitude was used in GrafNav for the base station value. Error was calculated using UTM output from OPUS (to get error in meters) for each day and was calculated as the absolute value of the final value minus the daily value. For this survey, the maximum horizontal error for the base station used for processing the single-beam bathymetry was 0.6 cm. DGPS navigation for the swath survey used OmniSTAR HP with horizontal accuracy reported by the service as +/- 10 cm (95% of the time).
  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 is a complete processed trackline file for the swath bathymetry survey.
  5. How consistent are the relationships among the observations, including topology?
    These tracklines represent the surveyed lines during collection of swath bathymetry data. They represent data coverage for the 2010 Cat Island survey.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: none
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)
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    600 4th Street South
    St. Petersburg, FL

    (727) 803-8747 (voice)
  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, 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: ASCII (version 1) xyz Size: 26.8
      Media you can order: DVD (format DVD)
    • Cost to order the data: none

  5. Is there some other way to get the data?
  6. 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?

Last modified: 22-Sep-2021
Metadata author:
U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
Attn: Noreen A. Buster
600 4th Street South
St. Petersburg, FL

(727) 803-8747 x3114 (voice)
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

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