Chan13_SBB_tracklines: Shapefile of the Single-Beam Bathymetry Tracklines (SBB) from USGS FAN 13BIM03 and 13BIM04 surveyed in July 2013 and 13BIM08 surveyed in August 2013 around the Chandeleur Islands, Louisiana.

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Frequently anticipated questions:

What does this data set describe?

Title:
Chan13_SBB_tracklines: Shapefile of the Single-Beam Bathymetry Tracklines (SBB) from USGS FAN 13BIM03 and 13BIM04 surveyed in July 2013 and 13BIM08 surveyed in August 2013 around the Chandeleur Islands, Louisiana.
Abstract:
As part of the Barrier Island Evolution Research Project, scientists from the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center (SPCMSC) conducted nearshore geophysical surveys around the northern Chandeleur Islands, Louisiana, in July and August of 2013. The objective of the study is to better understand barrier-island geomorphic evolution, particularly storm-related depositional and erosional processes that shape the islands over annual to interannual timescales (1‒5 years). Collecting geophysical data will allow us to identify relationships between the geologic history of the island and its present day morphology and sediment distribution. This mapping effort was the third in a series of three planned surveys in this area. High resolution geophysical data collected in each of three consecutive years along this rapidly changing barrier island system will provide a unique time-series dataset that will significantly further the analyses and geomorphological interpretations of this and other coastal systems, improving our understanding of coastal response and evolution over short time scales (1‒5 years). This data series includes the geophysical data that were collected during two cruises (USGS Field Activity Numbers (FAN) 13BIM02, 13BIM03, and 13BIM04, in July 2013; and FANs 13BIM07 and 13BIM08 in August 2013) aboard the R/V Sallenger, the R/V Jabba Jaw, and the R/V Shark along the northern portion of the Chandeleur Islands, Breton National Wildlife Refuge, Louisiana. Primary data were acquired with the following equipment: (1) a Systems Engineering and Assessment, Ltd., SWATHplus interferometric sonar (468 kilohertz [kHz]), (2) an EdgeTech 424 (424 kHz) chirp sub-bottom profiling system, and (3) two Teledyne Odom Hydrographic Systems, Incorporated, Echotrach CV100 single beam echosounders.
This data series report serves as an archive of processed interferometric swath and single-beam bathymetry data. Geographic information system data products include an interpolated digital elevation model, trackline maps, 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 purposes. 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 marine surveying, positioning, and navigation software.
  1. How might this data set be cited?
    U.S. Geological Survey, 2017, Chan13_SBB_tracklines: Shapefile of the Single-Beam Bathymetry Tracklines (SBB) from USGS FAN 13BIM03 and 13BIM04 surveyed in July 2013 and 13BIM08 surveyed in August 2013 around the Chandeleur Islands, Louisiana.:.

    Online Links:

    This is part of the following larger work.

    DeWitt, Nancy T., Miselis, Jennifer L., Fredericks, Jake J., Bernier, Julie C., Reynolds, B.J., Kelso, Kyle W., Thompson, Dave M., Flocks, James G., and Wiese, Dana S., 2017, Coastal Bathymetry Data Collected in 2013 from the Chandeleur Islands, Louisiana: U.S. Geological Survey Data Series 1032, U.S. Geological Survey, St. Petersburg, Florida.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -88.914482
    East_Bounding_Coordinate: -88.761559
    North_Bounding_Coordinate: 30.069700
    South_Bounding_Coordinate: 29.867688
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 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 (246)
    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: -87.0
      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 Meter
      The horizontal datum used is World Geodetic System 1984 (WGS84).
      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?
    Chan13_SBB_tracklines.shp
    Esri shapefile containing the survey tracklines for the single-beam bathymetry data collected during USGS cruises 13BIM03 and 13BIM04 in July 2013 and 13BIM08 in August 2013 from the southern Chandeleur Islands. (Source: USGS)
    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.
    Year
    String (Source: Esri) Year the survey was completed.
    Lenth_m
    Length of survey line, in meters (Source: Esri)
    Range of values
    Minimum:7.54
    Maximum:6851.05
    Units:meters
    Resolution:0.01
    Boat
    USGS vessel name from which survey data was acquired. The R/V Jabba Jaw was used to acquire data for 13BIM03 and 13BIM08. The R/V Shark was used to acquire data from 13BIM04. (Source: USGS) USGS research vessel name
    HypackLine
    Trackline name assigned by HYPACK acquisition software version 10 with the USGS FAN number appended to the beginning of the file. (Source: HYPACK)
    Range of values
    Minimum:13BIM03_001_1554
    Maximum:13BIM08_142_2159
    DOY
    Day of year the trackline was surveyed. (Source: USGS)
    Range of values
    Minimum:193
    Maximum:243
    USGS_FAN
    The USGS FAN number assigned to the survey vessel and survey type. 13BIM03 = RV Jabba Jaw and Single Beam Bathymetry (SBB). 13BIM04 = RV Shark and SBB. (Source: USGS) USGS FAN Number as assigned.

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 Single Beam Bathymetry (SBB) from USGS FAN 13BIM03 and 13BIM04 surveyed in July 2013 and 13BIM08 surveyed in August 2013 around the Chandeleur Islands, Louisiana.

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 3)
    The trackline positions for USGS Cruise 13BIM03 and 13BIM04 were acquired on the vessels using an Ashtech Z-Xtreme GPS receivers for 13BIM03 and 13BIM08. An Ashtech Proflex 800 GPS receiver was used for 13BIM04. The raw trackline position data for all USGS FANs were recorded using HYPACK version 10 marine surveying, positioning, and navigation 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
    Date: 2013 (process 2 of 3)
    A trackline file was created for each USGS FAN (13BIM03, 13BIM04 and 13BIM08) in Esri ArcGIS version 10.2.2.3552 using the XTools Pro extension, version 11.1. The trackline shapefile was created from the x,y,z point data shapefile, using the "XTools" feature conversion tool, "make polylines from points". Within "XTools" feature conversion selection window, the following items were selected. The "group by field selection" was set to use the HYPACK line name attribute and the "input feature order - order by field" was set to use the FID attribute. The trackline shapefiles files were then merged into one shapefile with a FAN attributes to differentiate the surveys. The resultant polyline shapefile was then projected in WGS84 Universal Transverse Mercator (UTM) Zone 16 North. 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:
    • 13BIM03rtk_SBB_Level_03_xxx_ITRF00b.shp 13BIM04_SBB_Level_03_xxx_ITRF00_pp193_194_196_redone_noOFSski 13BIM08_SBB_Level_03_xxx_ITRF00b
    Data sources produced in this process:
    • Chan13_SBB_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?
    The positional accuracy of the tracklines is determined by the accuracy of the processed GPS position data. The tracklines represent the data coverage extent for the single-beam bathymetry survey for USGS cruises 13BIM03, 13BIM04 and 13BIM08.
  2. How accurate are the geographic locations?
    For the July surveys, real-time kinematic (RTK) GPS was implemented in order to eliminate having to post-process the navigation component. Both base stations were equipped with a Magellan ProFlex500 GPS receiver, a Thales choke ring antenna, a Pacific Crest ADLP-1 390-430 megahertz (MHz) radio, and a Pacific Crest 5 decibel (dB) high power radio whip antenna. The radio whip antennas were placed onto 10-m collapsible masts providing line of site transmission to the vessels (rovers) anywhere within the survey boundary. The GPS and radio components were duplicated on each vessel. The base stations were set to record internally at a rate greater than or equal to the recording rate of the rovers, in this case 5 Hz. The known coordinates of each base station were entered into the GPS receiver and the RTK corrections were broadcast to the roving GPS receivers via the radio links at 5 Hz. The R/V Jabba Jaw recorded GPS positions at 1 Hz using an Ashtech Z-Xtreme GPS receiver. The R/V Shark recorded GPS positions at a rate of 5 Hz using a Magellan ProFlex 800 GPS receiver and Ashtech marine antenna. The manufacturer's stated accuracy of fixed RTK GPS data is 1 centimeter (cm) in the horizontal and 2 cm in the vertical. The raw trackline position data were recorded using HYPACK version 10 marine surveying, positioning, and navigation software.
    For the August surveys, RTK was not used due to time constraints and navigation data was post processed. The same base stations were used (TMRK and BRM2). The base receivers and the rover receiver recorded their positions concurrently at 1-second (s) intervals throughout the survey. GPS data was acquired and processed in the World Geodetic Datum of 1984 (WGS84) (G1150). The manufacturer's stated accuracy of the processed kinematic GPS data is 10 millimeters (mm) in the horizontal to 20 mm in the vertical. The raw trackline position data were recorded using HYPACK version 10 marine surveying, positioning, and navigation 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 single-beam bathymetry data collected during USGS Cruises 13BIM03 and 13BIM04 in July 2013 and 13BIM08 in August 2013 from the southern Chandeleur Islands.
  5. How consistent are the relationships among the observations, including topology?
    This zip archive contains the single-beam bathymetry survey tracklines, recorded at the time of data collection for USGS cruises 13BIM03, 13BIM04 and 13BIM08. Field logs, vessel platform descriptions, and other survey information are available at, https://doi.org/10.3133/ds1032.

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 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, 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?
  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: 13-Oct-2020
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/Chan13_SBB_tracklines_metadata.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:18:40 2021