Breton Island, Louisiana Baseline (Geographic, NAD83)

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Frequently anticipated questions:

What does this data set describe?

Title: Breton Island, Louisiana Baseline (Geographic, NAD83)
Abstract:
Breton Island, Louisiana Baseline (Geographic, NAD83) consists of vector line data that were input into the Digital Shoreline Analysis System (DSAS) version 4.0, which is computer software used to compute rate of change statistics. A baseline was acquired from the Barrier Island Comprehensive Monitoring Program (BICM) 2009 report (http://lacoast.gov/reports/project/3890772~1.pdf). The baseline included in the BICM report covered the entire Louisiana coastline, so the baseline representing Breton Island had to be clipped then exported to a new shapefile named Breton_Baseline.shp. The position relative to Breton Island was determined to be the best possible baseline to use for the study. The baseline file was used to create the transect files, which are required by the DSAS program to calculate rate of change statistics.
  1. How might this data set be cited?
    Terrano, Joseph F., Smith, Kathryn E., and Flocks, James G., 20160125, Breton Island, Louisiana Baseline (Geographic, NAD83): U.S. Geological Survey Data Release doi:10.5066/F7XS5SGM, U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -89.235148
    East_Bounding_Coordinate: -89.144434
    North_Bounding_Coordinate: 29.503003
    South_Bounding_Coordinate: 29.450661
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date:
    Ending_Date: 16-Jan-2014
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: vector digital data (Polyline)
  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 (1)
    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 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.
  7. How does the data set describe geographic features?
    Breton_Baseline
    Baseline used in the Digital Shoreline Analysis System program (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
    Reach_Name
    Region the baseline was designed to cast transects for (Source: USGS) Name of the nearest feature that DSAS calculates statistics for. (Ex. island name, parish name)
    Shape_Leng
    Length of feature in internal units. (Source: ESRI)
    Range of values
    Minimum:1347.408272
    Maximum:1347.408272
    ID
    Value assigned to the baseline for use in DSAS analysis. (Source: USGS)
    Range of values
    Minimum:1
    Maximum:1

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Joseph F. Terrano
    • Kathryn E. Smith
    • James G. Flocks
  2. Who also contributed to the data set?
    Funds for this report are part of project funds for the Louisiana Outer Coast Early Restoration Project, obtained by the natural resource trustees for the Deepwater Horizon Oil Spill, pursuant to the Framework for Early Restoration Addressing Injuries Resulting from the Deepwater Horizon Oil Spill executed April 20, 2011. USFWS is the project lead for the North Breton Island Barrier Island Restoration project. Acknowledgment of the U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, as a data source would be appreciated in products developed from these data, and such acknowledgment as is standard for citation and legal practices. Sharing of new data layers developed directly from these data would also be appreciated by the U.S. Geological Survey staff. Users should be aware that comparisons with other datasets for the same area from other time periods may be inaccurate due to inconsistencies resulting from changes in photointerpretation, mapping conventions, and digital processes over time. These data are not legal documents and are not to be used as such.
  3. To whom should users address questions about the data?
    U.S. Geological Survey Coastal and Marine Science Center
    Attn: Joseph F. Terrano
    Researcher 1
    600 4th Street South
    St. Petersburg, Florida
    US

    (727) 502-8047 (voice)
    (727) 502-8001 (FAX)
    jterrano@usgs.gov
    Hours_of_Service:
    Monday through Friday, 9:00 a.m. to 5:00 p.m., Eastern Standard Time

Why was the data set created?

The baseline was digitized as a single vector line parallel to, and seaward of, the Breton Island shorelines. The baseline serves as a starting point for the DSAS program to cast transects. For this analysis, transects were spaced out at a 50-meter (m) interval across the baseline.

How was the data set created?

  1. From what previous works were the data drawn?
    Breton_DSAS_Baseline (source 1 of 1)
    Luis Martinez, Sean O’Brien, Matt Bethel, Shea Penland and Mark Kulp, 2009, Louisiana Barrier Island Comprehensive Monitoring Program (BICM) Volume 2: Shoreline Changes and Barrier Island Land Loss 1800’s‐2005.

    Online Links:

    Type_of_Source_Media: Online
    Source_Scale_Denominator: 1500
    Source_Contribution:
    The baseline for Breton Island was acquired from the 2009 BICM report and used in this study to maintain consistency with transect spacing and positions.
  2. How were the data generated, processed, and modified?
    Date: 01-Jun-2015 (process 1 of 2)
    The baseline data downloaded from the BICM 2009 report encompassed the entire state of Louisiana; however, this project’s study area was restricted to Breton Island. Therefore, the BICM baseline was clipped using ArcMap 10.2 to match the study area extents, prior to the baseline being exported to a new shapefile named Breton_Baseline.shp. Breton_Baseline.shp was used to analyze the following time periods: (1) 1869-2014 (long term), (2) pre-1950s (before excavation of the MRGO), (3) post- 1950s (post MRGO), (4) post- Hurricane Katrina (short term), and (5) pre/post Hurricane Katrina (acute weather event). The baseline was used to generate perpendicular transects at a 50-m interval. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Joseph Terrano
    600 4th Street South
    St. Petersburg, Florida
    US

    (727) 502-8047 (voice)
    (727) 502-8001 (FAX)
    jterrano@usgs.gov
    Hours_of_Service:
    Monday through Friday, 9:00 a.m. to 5:00 p.m., Eastern Standard Time
    Date: 13-Oct-2020 (process 2 of 2)
    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?
    Thieler, E.R., Himmelstoss, E.A., Zichichi, J.L., and Ergul, Ayhan, 2009, The Digital Shoreline Analysis System (DSAS) version 4.0—an ArcGIS Extension for Calculating Shoreline Change.

    Online Links:

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    This dataset is considered complete for the information presented, as described in the abstract section. Users are advised to read the rest of the metadata record carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    The baseline was acquired from the Barrier Island Comprehensive Monitoring Program (BICM) 2009 report. The baseline is positioned seaward of the 1869 to 2014 Breton Island shorelines.

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 to be acknowledged as originator of the data in future products or derivative research.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    Attn: James Flocks
    600 4th Street South
    St. Petersburg, Florida
    US

    (727) 502-8012 (voice)
    (727) 502-8001 (FAX)
    Hours_of_Service:
    Monday through Friday, 9:00 a.m. to 5:00 p.m., Eastern Standard Time
    Contact_Instructions: All of this report is available online.
  2. What's the catalog number I need to order this data set? Breton_Baseline.shp
  3. What legal disclaimers am I supposed to read?
    This digital 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?

Who wrote the metadata?

Dates:
Last modified: 13-Oct-2020
Metadata author:
U.S. Geological Survey
Attn: Joseph Terrano
600 4th Street South
St. Petersburg, Florida
US

(727) 502-8047 (voice)
(727) 502-8001 (FAX)
jterrano@usgs.gov
Hours_of_Service:
Monday through Friday, 9:00 a.m. to 5:00 p.m., Eastern Standard Time
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/F7XS5SGM-baseline-metadata.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:18:49 2021