02TRKLN - Boomer Seismic Reflection Trackline data for USGS cruise 00SCC02

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Frequently anticipated questions:


What does this data set describe?

Title:
02TRKLN - Boomer Seismic Reflection Trackline data for USGS cruise 00SCC02
Abstract:
Marine seismic reflection data are used to image and map sedimentary and structural features of the seafloor and subsurface. These data are useful in mapping stratigraphy and in assessing other submarine geologic characteristics and features. The data presented here are useful in mapping sand deposits that may be used in Louisiana beach nourishment projects. These data were collected as part of a Louisiana Sand Resources Study done in cooperation between the USGS, U.S. Army Corps of Engineers, University of New Orleans, Louisiana Department of Natural Resources, and Eckerd College. This study is part of the USGS Subsidence and Coastal Change (SCC) Project.
  1. How might this data set be cited?
    Calderon, Karynna, 2003, 02TRKLN - Boomer Seismic Reflection Trackline data for USGS cruise 00SCC02: U.S. Geological Survey, Coastal and Marine Geology Program, Center for Coastal and Watershed Studies, St. Petersburg, FL.

    Online Links:

    This is part of the following larger work.

    Calderon, Karynna, Dadisman, Shawn V., Kindinger, Jack L., Peery, Gina M., Flocks, James G., Wiese, Dana S., Kulp, Mark, Penland, Shea, Britsch, Louis D., and Brooks, Gregg R., 2003, Archive of Boomer Seismic Reflection Data Collected During USGS Cruises 00SCC02 and 00SCC04, Barataria Basin, Louisiana, May 12 - 31 and June 17 - July 2, 2000: Open-File Report 03-402, U.S. Geological Survey, Coastal and Marine Geology Program, Center for Coastal and Watershed Studies, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -90.212717
    East_Bounding_Coordinate: -89.462990
    North_Bounding_Coordinate: 29.431351
    South_Bounding_Coordinate: 29.072833
  3. What does it look like?
    http://pubs.usgs.gov/of/2003/of03-402/maps/02all.jpg (JPEG)
    Trackline map of all boomer seismic reflection data collected during USGS Cruise 00SCC02. These data were collected in the Barataria Basin of Louisiana in May of 2000.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 12-May-2000
    Ending_Date: 31-May-2000
    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 (62)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.0000027. Longitudes are given to the nearest 0.0000027. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.
  7. How does the data set describe geographic features?
    02trkln
    FID
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: ESRI) Coordinates defining the features.
    ID
    Trackline number
    URL
    URL link to browse image of seismic record associated with trackline segment. (Source: Valerie Paskevich)

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Karynna Calderon
  2. Who also contributed to the data set?
    Seismic reflection data collection and processing were performed by J. Kindinger, J. Flocks, D. Wiese, and S. Dadisman of the USGS in St. Petersburg, FL; M. Kulp and S. Penland of the University of New Orleans; L. Britsch of the U.S. Army Corps of Engineers, New Orleans District; and G. Brooks of Eckerd College. Navigation data was edited by G. Peery and K. Calderon of the USGS in St. Petersburg, FL, with help from J. Dismukes, also of the USGS in St. Petersburg, FL.
  3. To whom should users address questions about the data?
    Shawn V. Dadisman
    U.S. Geological Survey
    Geologist
    600 Fourth Street South
    St. Petersburg, FL
    USA

    (727) 803-8747, ext. 3029 (voice)
    sdadisman@usgs.gov

Why was the data set created?

To aid in registering of boomer seismic reflection data collected during USGS Cruise 00SCC02.

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: 2003 (process 1 of 1)
    As seismic reflection data were acquired, the position of the vessel was continuously determined by a GPS receiver and recorded by a seismic acquisition system from which navigation data for each individual line were later extracted and saved as ASCII text files. These files were edited to remove spurious data values and fix incorrectly recorded dates. They were also reformatted for use by a script which produced a generate file containing only latitude and longitude fixes for all 00SCC02 boomer shotpoints. In ArcView 3.2, this generate file was run through a second script which produced a shapefile in which individual shotpoints were connected to form lines. This shapefile was then reprojected from WGS84 to NAD83 using the ArcView Projection Utility.
  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?
    Because the script that created this shapefile did not permit the trackline names to contain letters, all lines were renamed prior to running the script so that only the final numerical digits remained. For example, line "b00_28" became line "28." Furthermore, any letters needed to identify a particular section of a track were replaced with numbers. A's were replaced with "01," b's with "02," and c's with "03." For example, line "b00_28c" became line "2803."
  2. How accurate are the geographic locations?
    Positional accuracy was determined with a Trimble Centurian P-Code GPS receiver, whose accuracy is within 100 m. The navigation data used to create this shapefile have not been corrected to reflect the 20-m offset between the shotpoint and the GPS antenna.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the observations, including topology?

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 USGS requests to be acknowledged as the originator of the data in future products or derivative research.
  1. Who distributes the data set? (Distributor 1 of 1)
    Shawn V. Dadisman
    U.S. Geological Survey
    Geologist
    600 Fourth Street South
    St. Petersburg, FL
    USA

    (727) 803-8747, ext. 3029 (voice)
    sdadisman@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 data set was prepared by an agency of the U.S. Government. Neither the U.S. Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the U.S. Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the U.S. Government or any agency thereof.
    Although this data set has been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: ArcView shapefile Size: 5.4 MB
    • Cost to 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's ArcView software. It may also be viewed with public domain software ArcExplorer (available at http://www.esri.com/software/arcexplorer/index.html) or with other GIS software capable of importing the data.

Who wrote the metadata?

Dates:
Last modified: 02-Nov-2004
Metadata author:
Karynna Calderon
U.S. Geological Survey
Geographer, Data Management Group
600 Fourth Street South
St. Petersburg, FL
USA

(727) 803-8747, ext. 3143 (voice)
kcalderon@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/navigation/02trkln.shp.faq.html>
Generated by mp version 2.9.49 on Fri Sep 13 15:01:41 2019