13CCT04_IFB_tracklines.shp

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Frequently anticipated questions:


What does this data set describe?

Title: 13CCT04_IFB_tracklines.shp
Abstract:
In August of 2013, the U.S. Geological Survey (USGS) conducted geophysical surveys offshore of Petit Bois Island, Mississippi. These efforts are a continued part of the U.S. Geological Survey Gulf of Mexico Science Coordination partnership with the U.S. Army Corps of Engineers (USACE) to assist the Mississippi Coastal Improvements Program (MsCIP) and the Northern Gulf of Mexico (NGOM) Ecosystem Change and Hazards Susceptibility Project, by mapping the shallow geologic stratigraphic framework of the Mississippi Barrier Island Complex. These geophysical surveys will provide the data necessary for scientists to define, interpret, and provide baseline bathymetry and seafloor habitat for this area to aid scientists in predicting future geomorphological changes to the islands with respect to climate change, storm impacts, and sea level rise. Furthermore, these data combined with the geomorphological results will provide the properties and extent of local offshore sand sediment resources available for planning and execution of the Gulf Islands National Seashore barrier island restoration. The geophysical data were collected during one cruise (USGS Field Activity Numbers 13CCT04) aboard the University of Southern Mississippi Research Vessel Tommy Munro offshore along the gulf side of Petit Bois Island, Gulf Islands National Seashore, Mississippi. Data were acquired with the following equipment: a Systems Engineering and Assessment, Ltd., SWATHplus interferometric sonar (468 kilohertz (kHz)), an EdgeTech 424 (4-24 kHz), an EdgeTech 525i chirp sub-bottom profiling system, and a Klein 3900 sidescan sonar system. This report serves as an archive of the processed interferometric swath bathymetry and sidescan sonar data. Geographic information system data products include an interpolated digital elevation model, an acoustic backscatter mosaic, a trackline map, and point data files. Additional files include error analysis maps, Field Activity Collection System logs, and formal Federal Geographic Data Committee metadata. NOTE: These data are scientific in nature and are not to be used for navigation. Any use of trade names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Supplemental_Information:
Trackline files were recorded at the time of the survey using HYPACK version 10.0.5.31 hydrographic acquisition and processing software.
  1. How might this data set be cited?
    U.S. Geological Survey, 2014, 13CCT04_IFB_tracklines.shp:.

    Online Links:

    This is part of the following larger work.

    DeWitt, Nancy T., Flocks, James G., Kindinger, Jack L., Bernier, Julie C., Kelso, Kyle W., Wiese, Dana S., Finlayson, Dave P., and Pfeiffer, William R., 2014, Archive of Side Scan Sonar and Swath Bathymetry Data Collected During USGS Cruise 13CCT04 Offshore of Petit Bois Island, Gulf Islands National Seashore, Mississippi, August 2014: U.S. Geological Survey Data Series 917, U.S. Geological Survey, St. Petersburg, Florida.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -88.542109
    East_Bounding_Coordinate: -88.320794
    North_Bounding_Coordinate: 30.193342
    South_Bounding_Coordinate: 30.076200
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 13-Aug-2013
    Ending_Date: 23-Aug-2013
    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 (68)
    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?
    13CCT04_IFB_tracklines.shp
    ESRI shapefile containing the survey tracklines for the interferometric swath bathymetry data collected in August 2013 off of Petit Bois Island, Gulf Islands National Seashore, Mississippi. (Source: USGS)
    FID
    Internal feature number. (Source: Esri) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: Esri) Coordinates defining the features.
    HYPACKLine
    String (Source: HYPACK) Line number in survey generated by HYPACK
    DOY
    Text (Source: Esri) The 2013 day of year that the trackline was surveyed.
    Year
    String. (Source: Esri) Year survey completed
    Lenth_m
    Length on survey line, in meters (Source: Esri)
    Range of values
    Minimum:63.37
    Maximum:1994.76
    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)
    • U.S. Geological Survey
  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?
    U.S. Geological Survey
    Attn: Nancy T. DeWitt
    Geologist
    600 4th Street South
    St. Petersburg, FL
    US

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

Why was the data set created?

This zip archive contains the survey tracklines in ESRI shapefile format for the interferometric bathymetry data collected in August 2013 offshore of Petit Bois Island, Gulf Islands National Seashore, Mississippi

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: 2013 (process 1 of 2)
    Acquisiton: via the CODA Octopus F190R Precision Attitude and Positioning System and differential GPS correction was obtained through the SeaSTAR/OmniSTAR High Performance (HP) broadcast subscription. The raw trackline position data were recorded using HYPACK version 10.0.5.31 hydrographic acquisition and processing software. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Nancy T. DeWitt
    Geologist
    600 4th Street South
    St. Petersburg, FL
    U.S.

    (727) 502-8000 (voice)
    ndewitt@usgs.gov
    Data sources produced in this process:
    • HYPACK raw bathymetry files (*.RAW)
    Date: 2013 (process 2 of 2)
    Trackline map creation: The tracklines were exported from HYPACK in Keyhole Markup Language (KML) format and imported into ESRI ArcGIS version 10.1. In ESRI ArcGIS, the trackline data were projected from the GPS acquisition datum (World Geodetic System of 1984, WGS84 G1150) to the North American Datum of 1983 (NAD83), Universal Transverse Mercator (UTM) Zone 16 North and saved to ESRI shapefile format. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Nancy T. DeWitt
    Geologist
    600 4th Street South
    St. Petersburg, FL
    U.S.

    (727) 502-8000 (voice)
    ndewitt@usgs.gov
    Data sources used in this process:
    • HYPACK raw bathymetry files (*.RAW)
    Data sources produced in this process:
    • 13CCT04_IFB_tracklines.shp
  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 accuracy of the raw position data recorded by the GPS antenna during data collection. The tracklines represent the data coverage extent for the interferometric swath bathymetry survey. These trackline data have not been independently verified for accuracy.
  2. How accurate are the geographic locations?
    Navitaion information was recorded via the CODA Octopus F190R Precision Attitude and Positioning System and differential GPS correction was obtained through the SeaSTAR/OmniSTAR High Performance (HP) broadcast subscription. The raw trackline position data were recorded using HYPACK version 10.0.5.31 hydrographic acquisition and processing software.
  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 survey trackline dataset for the interferometric swath bathymetry data collected in August 2013 from offshore of Petit Bois Island, Gulf Island National Seashore.
  5. How consistent are the relationships among the observations, including topology?
    This zip archive contains the interferometric swath bathymetry survey tracklines, recorded at the time of data collection in August 2013. Field logs, vessel platform descriptions, and other survey information are available at http://pubs.usgs.gov/ds/###/facs

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)
    U.S. Geological Survey
    600 4th Street South
    St. Petersburg, FL
    U.S.

    (727) 502-8000 (voice)
    ndewitt@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, 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. Is there some other way to get the data?
    none
  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?

Dates:
Last modified: 08-Jun-2016
Metadata author:
U.S. Geological Survey
Attn: Nancy T. DeWitt
Geologist
600 4th Street South
St. Petersburg, FL
U.S.

(727) 502-8000 (voice)
ndewitt@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/13CCT04_IFB_tracklines_metadata.faq.html>
Generated by mp version 2.9.49 on Mon Sep 10 17:44:10 2018