Sediment Core Locations Collected in March 2012 from the Chandeleur Islands, Louisiana (U.S. Geological Survey Field Activity Number 12BIM01)

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Frequently anticipated questions:


What does this data set describe?

Title:
Sediment Core Locations Collected in March 2012 from the Chandeleur Islands, Louisiana (U.S. Geological Survey Field Activity Number 12BIM01)
Abstract:
Scientists from the U.S. Geological Survey (USGS), St. Petersburg Coastal and Marine Science Center collected a set of sediment cores from the back-barrier environments along the Chandeleur Islands, Louisiana, in March 2012. The sampling efforts were part of a larger USGS study to evaluate effects on the geomorphology of the Chandeleur Islands following the construction of an artificial sand berm to reduce oil transport onto federally managed lands. The objective of this study was to evaluate the response of the back-barrier tidal and wetland environments to the berm. This report serves as an archive for sedimentological and radiochemical data derived from the sediment cores. The data described in this report is available for download.
Supplemental_Information: None
  1. How might this data set be cited?
    Marot, Marci E., 20170315, Sediment Core Locations Collected in March 2012 from the Chandeleur Islands, Louisiana (U.S. Geological Survey Field Activity Number 12BIM01):.

    This is part of the following larger work.

    Marot, Marci E., Smith, Christopher G., Adams, C. Scott, and Richwine, Kathyrn A., 20170315, Sediment Lithology and Radiochemistry from the Back-Barrier Environments Along the Chandeleur Islands, Louisiana: March 2012: U.S. Geological Survey Data Series 1045, U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -88.836353
    East_Bounding_Coordinate: -88.824796
    North_Bounding_Coordinate: 29.969588
    South_Bounding_Coordinate: 29.895421
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 24-Mar-2012
    Ending_Date: 26-Mar-2012
    Currentness_Reference:
    Ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Tabular 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 (8)
    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 0.001
      Ordinates (y-coordinates) are specified to the nearest 0.001
      Planar coordinates are specified in Meters
      The horizontal datum used is North American Datum of 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?
    Site_Location.xlsx
    Micr0soft Excel workbook defining the location of sediment samples collected in March 2012 from the northern Chandeleur Islands, Louisiana (U.S. Geological Survey Field Activity Number 12BIM01) (Source: USGS)
    Core ID
    Core identification number (Source: USGS) Core site identification number assigned by USGS scientist
    Sampling Date
    Date core was collected (Source: USGS)
    Range of values
    Minimum:3/24/2012
    Maximum:3/26/2012
    Units:mm/dd/yyyy
    Resolution:1 day
    Latitude
    Latitude of sample location in decimal degrees (NAD83) (Source: USGS)
    Range of values
    Minimum:29.89559
    Maximum:29.96950
    Units:decimal degrees
    Resolution:0.00001
    Longitude
    Longitude of sample location in decimal degrees (NAD83) (Source: USGS)
    Range of values
    Minimum:-88.83258
    Maximum:-88.82502
    Units:decimal degrees
    Resolution:0.00001
    Easting (m)
    X-coordinate (easting) of sample location in meters (NAD83, UTM Zone 16N) (Source: USGS)
    Range of values
    Minimum:323182.483
    Maximum:323803.558
    Units:Meters
    Resolution:0.001
    Northing (m)
    Y-coordinate (northing) of sample location in meters (NAD83, UTM Zone 16N) (Source: USGS)
    Range of values
    Minimum:3308617.196
    Maximum:3316818.387
    Units:Meters
    Resolution:0.001
    Elevation (m)
    Elevation of sample location in meters (NAVD88, GEOID09) (Source: USGS)
    Range of values
    Minimum:-0.010
    Maximum:0.374
    Units:Meters
    Resolution:0.001

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Marci E. Marot
  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: Marci Marot
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

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

Why was the data set created?

The Site_Locations.xlsx file includes sampling date, core location coordinates and elevation for sampling sites occupied on the Chandeleur Islands, Louisiana in March 2012 by the USGS, St. Petersburg Coastal and Marine Science Center.

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: 2012 (process 1 of 3)
    Accurate position and elevation data were obtained at all sampling locations with an Ashtech Differential Global Positioning System (DGPS) receiver and antenna with occupation times of 30 minutes. A GPS base station was erected at a temporarily installed USGS benchmark (TMRK) located on the sound side of the Chandeleur Islands within about 6 km of the furthest sample site. GPS receivers recorded the 12-channel full-carrier-phase positioning signals (L1/L2) from satellites via the Thales choke-ring antenna. This GPS instrument combination was duplicated on the rover GPS. The base receiver and the rover receiver record their positions concurrently at 1-second (s) recording intervals throughout the survey. Occupation times at the sample sites ranged from 5 to 30 minutes. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Marci Marot
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    mmarot@usgs.gov
    Date: 2012 (process 2 of 3)
    The coordinate values of the GPS base station (TMRK) are the time-weighted average of values obtained from the National Geodetic Survey On-Line Positioning User Service (OPUS). The base station coordinates were imported into GrafNav and GrafNet, version 8.3 (Waypoint Product Group) and the GPS data from the rover were post-processed to the concurrent GPS session data at the base station. The GPS data were processed and exported in the World Geodetic System of 1984 (WGS84) (G1150) geodetic datum. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Marci Marot
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    mmarot@usgs.gov
    Date: 2013 (process 3 of 3)
    Sample locations were transformed from the GPS acquisition datum (WGS84) to the North American Datum of 1983 (NAD83), and the North American Vertical Datum of 1988 (NAVD88) orthometric elevation (geoid model of 2009, GEOID09) using NOAA VDatum version 3.2 transformation software (http://vdatum.noaa.gov/) and imported into Esri ArcGIS version 10.1. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Marci Maro
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
  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 sample locations was determined by the accuracy of the raw position data recorded by the GPS antenna during data collection. Differential Geographic Positioning System (DGPS) coordinates were obtained using post-processing software packages (National Geodetic Survey's On-Line Positioning User Service (OPUS), version 2.2 and Waypoint Product Group's GrafNav and GrafNet, version 8.30).
  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 Oceanic and Atmospheric Administration (NOAA) and the National Geodetic Survey (NGS), and the results 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 position minus the session position value. The maximum horizontal error of the base station coordinates used for post-processing the sample locations was 0.00018 seconds latitude and 0.00045 seconds longitude.
  3. How accurate are the heights or depths?
    All static base station sessions were processed through OPUS maintained by the National Oceanic and Atmospheric Administration (NOAA) and the National Geodetic Survey (NGS). The base location results from OPUS 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 position minus the session position value. For this survey, the standard deviation or the base station ellipsoid height was 0.006 m and the maximum vertical error for the base station was +/- 0.021 m. All sample locations were post-processed to the base station coordinates.
  4. Where are the gaps in the data? What is missing?
    This is a complete processed location and elevation data file for the 12BIM01 sediment data archive.
  5. How consistent are the relationships among the observations, including topology?
    This dataset contains the post-processed DGPS coordinates for samples collected during May 2012.

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
    Attn: Marci Marot
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    mmarot@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?
    Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), 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 USGS or U.S. Government shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: This Microsoft Excel workbook contains site locations for sediment samples collected in March 2012 (USGS Field Activity Number 12BIM01). in format Microsoft Excel (version 2010) Size: 0.010
      Network links: https://pubs.usgs.gov/ds/1045/downloads/Site_Locations.xlsx
    • Cost to order the data: None, if obtained online

  5. What hardware or software do I need in order to use the data set?
    This workbook was created using Microsoft Excel 2010 and can be opened using Microsoft Excel 2007 or higher; these data may also be viewed using the free Microsoft Excel Viewer (http://www.microsoft.com/).

Who wrote the metadata?

Dates:
Last modified: 15-Mar-2017
Metadata author:
U.S. Geological Survey
Attn: Marci Marot
Geologist
600 4th Street South
St. Petersburg, FL
USA

(727) 502-8000 (voice)
mmarot@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/ds1045_Site_Locations-met.faq.html>
Generated by mp version 2.9.49 on Mon Sep 10 17:44:43 2018