Sediment Sample Locations Collected in July 2013 from the Northern Chandeleur Islands, Louisiana (U.S. Geological Survey Field Activity Number 13BIM05)

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Frequently anticipated questions:


What does this data set describe?

Title:
Sediment Sample Locations Collected in July 2013 from the Northern Chandeleur Islands, Louisiana (U.S. Geological Survey Field Activity Number 13BIM05)
Abstract:
As part of the Barrier Island Evolution Research (BIER) project, scientists from the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center (SPCMSC) collected sediment samples from the northern Chandeleur Islands in July 2013. The overall objective of this project, which integrates geophysical (bathymetric, seismic, and topographic) and sedimentologic data, is to understand better the depositional and erosional processes that drive the morphologic evolution of barrier islands over annual to interannual timescales (1 to 5 years). Between June 2010 and April 2011, in response to the Deepwater Horizon oil spill, the State of Louisiana constructed a sand berm extending more than 14 kilometers (km) along the northern Chandeleur Islands platform. The construction of the berm provided a unique opportunity to investigate how this new sediment source interacts with and affects the morphologic evolution of the barrier-island system. Data collected from this study can be used to describe differences in the physical characteristics and spatial distribution of sediments both along the axis of the berm and also along transects across the berm and onto the adjacent barrier island. Comparison of these data with data from prior sampling efforts can provide information about sediment interactions and movement between the berm and the natural island platform, improving our understanding of short-term morphologic change and processes in this barrier-island system. This data series serves as an archive of sediment data collected in July 2013 from the Chandeleur Islands sand berm and adjacent barrier-island environments. Data products, including descriptive core logs, core photographs and x-radiographs, results of sediment grain-size analyses, sample location maps, and Geographic Information System (GIS) data files with accompanying formal Federal Geographic Data Committee (FDGC) metadata, can be downloaded from https://pubs.usgs.gov/ds/894/downloads.html.
Supplemental_Information: None
  1. How might this data set be cited?
    Bernier, Julie C., 20131231, Sediment Sample Locations Collected in July 2013 from the Northern Chandeleur Islands, Louisiana (U.S. Geological Survey Field Activity Number 13BIM05):.

    Online Links:

    This is part of the following larger work.

    Buster, Noreen A., Kelso, Kyle W., Bernier, Julie C., Flocks, James G., Miselis, Jennifer L., and DeWitt, Nancy T., 20131231, Sediment Data Collected in 2013 from the Northern Chandeleur Islands, Louisiana: U.S. Geological Survey Data Series 894, U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -88.850652
    East_Bounding_Coordinate: -88.820558
    North_Bounding_Coordinate: 30.017232
    South_Bounding_Coordinate: 29.886867
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 05-Jul-2013
    Ending_Date: 19-Jul-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):
      • Point (67)
    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 D North American 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: 0.01
      Altitude_Distance_Units: Meters
      Altitude_Encoding_Method: Attribute values
  7. How does the data set describe geographic features?
    13BIM05_samplesites.shp
    Esri point shapefile representing the location of sediment samples collected in July 2013 from the northern Chandeleur Islands, Louisiana (U.S. Geological Survey Field Activity Number 13BIM05) (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
    SAMPLE
    Sample identification number based on Field Activity Number and sample number or site (Source: USGS) Character string
    SITE
    Physical description of sample location (Source: USGS) Character string
    12BIM01
    Sample identification of samples collected in 2012 that were reoccupied in 2013. (Source: USGS) Character string
    LAT_NAD83
    Latitude of sample location in decimal degrees (NAD83) (Source: USGS)
    Range of values
    Minimum:29.87542
    Maximum:30.01685
    Units:decimal degrees
    Resolution:0.00001
    LON_NAD83
    Longitude of sample location in decimal degrees (NAD83) (Source: USGS)
    Range of values
    Minimum:-88.85067
    Maximum:-88.82052
    Units:decimal degrees
    Resolution:0.00001
    Easting
    X-coordinate (easting) of sample location in meters (NAD83, UTM Zone 16N) (Source: USGS)
    Range of values
    Minimum:321523.391
    Maximum:324198.285
    Units:Meters
    Resolution:0.001
    Northing
    Y-coordinate (northing) of sample location in meters (NAD83, UTM Zone 16N) (Source: USGS)
    Range of values
    Minimum:3307684.114
    Maximum:3322094.14
    Units:Meters
    Resolution:0.001
    ELEV_m
    Elevation of sample location in meters (NAVD88, GEOID09) (Source: USGS)
    ValueDefinition
    -9999No Data - Elevation was not collected using DGPS and was collected outside of the lidar elevation dataset extent
    Range of values
    Minimum:-0.25
    Maximum:1.11
    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)
    • Julie C. Bernier
  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: Noreen Buster
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

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

Why was the data set created?

This zip archive includes the sample locations in Esri shapefile format for sediment samples collected in July 2013 from the northern Chandeleur Islands, Louisiana (U.S. Geological Survey Field Activity Number 13BIM05).

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 6)
    Sample locations were recorded at the time of collection with a Garmin GPSMAP 76S handheld Global Positioning System (GPS) receiver along with a physical description of each sample site. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Julie Bernier
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    jbernier@usgs.gov
    Date: 2013 (process 2 of 6)
    A GPS base station was erected at a previously installed USGS benchmark (TMRK) located on the sound side of the Chandeleur Islands within about 8 km of the farthest sample site. A Magellan ProFlex 500 GPS receiver recorded the 12-channel full-carrier-phase positioning signals (L1/L2) from satellites via a Thales choke-ring antenna at the base station. A similar GPS instrument combination (Ashtech Z-Xtreme receiver and Ashtech geodetic antenna) was used for the rover GPS. The base receiver and the rover receiver record their positions concurrently at 1-second recording intervals throughout the survey. A rapid-static survey technique was used, with a static occupation duration of 5 minutes at each sample site. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Julie Bernier
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    jbernier@usgs.gov
    Date: 2013 (process 3 of 6)
    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, version 8.4 (Waypoint Product Group) and the data from the rover GPS were post-processed to the concurrent GPS session data at the base station. The GPS data were acquired and processed in the World Geodetic System of 1984 (WGS84) (G1150) geodetic datum. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Julie Bernier
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    jbernier@usgs.gov
    Date: 2013 (process 4 of 6)
    Using the NOAA transformation software VDatum, version 3.2 (http://vdatum.noaa.gov/), the sample locations were transformed from the GPS acquisition datum (WGS84) to the North American Datum of 1983 (NAD83), Universal Transverse Mercator (UTM) Zone 16 reference frame and the North American Vertical Datum of 1988 (NAVD88) orthometric elevation using the NGS geoid model of 2009 (GEOID09) and imported into Esri ArcGIS version 10.1. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Julie Bernier
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    Date: 2014 (process 5 of 6)
    Surface elevations for sample sites at which DGPS data were not collected were interpolated from a 2.5-meter by 2.5-meter gridded surface of USGS lidar data collected in July 2013 using the Spatial Analyst Extract Values to Points tool in Esri ArcGIS version 10.2. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Julie Bernier
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    jbernier@usgs.gov
    Date: 27-Mar-2018 (process 6 of 6)
    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
    Geologist
    600 4th Street South
    St. Petersburg, FL

    727-502-8000 (voice)
    aforde@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 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, NGS, On-Line Positioning User Service, OPUS, and Waypoint Product Group GrafNav, version 8.40). For the five sample sites at which DGPS data were not collected, the positional accuracy of the sample locations was determined by the accuracy of the Garmin GPSMAP 76S handheld Global Positioning System (GPS) receiver used to locate the samples at the time of collection.
  2. How accurate are the geographic locations?
    All static GPS 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). The OPUS base-station solutions were entered into a spreadsheet to compute a final positional coordinate (latitude, longitude, and ellipsoid height). Using the OPUS values and duration of each session, the final position was calculated as a time-weighted average of all GPS sessions. Base-station positional error 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 0.00090 seconds latitude and 0.00027 seconds longitude. All sample locations were post-processed to the final base station coordinates. For the five sample sites at which DGPS data were not collected, sample locations were recorded at the time of collection using a Garmin GPSMAP handheld Global Positioning System (GPS) receiver with a manufacturer's specified accuracy of 3 to 5 meters (95% typical).
  3. How accurate are the heights or depths?
    All static GPS base station sessions were processed through OPUS, and the resulting base-station solutions 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 maximum vertical error for the base station was 0.035 meters. All sample locations were post-processed to the final base station coordinates. For the five sample sites at which DGPS data were not collected, the surface elevations of the sediment samples were interpolated from USGS lidar data collected in July 2013 with a vertical root mean square error (RMSEz) of 0.073 meters.
  4. Where are the gaps in the data? What is missing?
    This dataset includes the locations of 11 surface grab samples and 18 push cores collected from the northern Chandeleur Islands in July 2013 (U.S. Geological Survey Field Activity Number, FAN, 13BIM05). As part of a collaborative sampling effort (USGS FAN 13BIM06), an additional 10 push cores were collected from back-barrier marsh and tidal flat sites; sedimentologic and geochemical analysis of those sediments are described in a separate report (U.S. Geological Survey Open File Report 2014-1079).
  5. How consistent are the relationships among the observations, including topology?
    Sample locations were recorded at the time of collection with a Garmin GPSMAP 76S handheld Global Positioning System (GPS) receiver. The final sample locations, including elevation, are the post-processed DGPS coordinates.

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: Noreen Buster
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    nbuster@usgs.gov
  2. What's the catalog number I need to order this data set? 13BIM05_samplesites.shp
  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?
    • Availability in digital form:
      Data format: This zip file contains an Esri ArcGIS map document, two sample location point shapefiles, an island-extent polygon shapefile, and the associated metadata. in format Esri shapefile (version 10.2.1) Vector point data Size: 1.91
      Network links: https://pubs.usgs.gov/ds/0894/downloads/13BIM05_GIS.zip
    • 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 shapefile was created using Esri ArcGIS version 10.2.1 and can be opened using Esri ArcGIS version 10.0 or higher; these data may also be viewed using the free GIS viewer ArcGIS Explorer (http://www.esri.com/software/arcgis/explorer).

Who wrote the metadata?

Dates:
Last modified: 27-Mar-2018
Metadata author:
U.S. Geological Survey
Attn: Noreen Buster
Geologist
600 4th Street South
St. Petersburg, FL
USA

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

This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/13BIM05_samplesites-GIS-met.faq.html>
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