Hurricane Laura Overwash Extents

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Frequently anticipated questions:


What does this data set describe?

Title: Hurricane Laura Overwash Extents
Abstract:
The National Assessment of Coastal Change Hazards project project at the U.S. Geological Survey (USGS) exists to understand and predict storm impacts to our nation's coastlines. This geospatial dataset defines the alongshore extent of overwash sediments deposited along the Louisiana coast and attributed to coastal processes during [Atlantic Basin] Hurricane Laura, which made landfall in the U.S. on August 27, 2020.
  1. How might this data set be cited?
    Doran, Kara S., Birchler, Justin J., and Bendik, Kirsten J., 20240611, Hurricane Laura Overwash Extents:.

    This is part of the following larger work.

    Doran, Kara S., Birchler, Justin J., and Bendik, Kirsten J., 20190813, Storm-Induced Overwash Extent: U.S. Geological Survey data release doi:10.5066/P9BW6CG6, U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -93.856172
    East_Bounding_Coordinate: -92.575239
    North_Bounding_Coordinate: 29.776068
    South_Bounding_Coordinate: 29.581307
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 27-Aug-2020
    Ending_Date: 31-Aug-2020
    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 (44)
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 15
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -93.0
      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 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.
  7. How does the data set describe geographic features?
    Laura_Overwash_Extent.shp
    Attribute table of the delineated overwash extents from the landfall of Hurricane Laura in 2020. (Source: USGS)
    FID
    Overwash segment identification number. (Source: Esri)
    Range of values
    Minimum:0
    Maximum:43
    Shape
    Feature geometry. (Source: Esri) Coordinates defining the features.
    TYPE
    The type of substrate in which the overwash extent deposited onto. If the field is left blank, the overwash extent did not cover any of the substrates defined below. (Source: USGS)
    ValueDefinition
    ROADThe substrate onto which overwash sediments are deposited.
    SHAPE_Leng
    Length of line segment, in meters. (Source: Esri)
    Range of values
    Minimum:9.256722
    Maximum:14755.75442
    Units:meters

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Kara S. Doran
    • Justin J. Birchler
    • Kirsten J. Bendik
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U.S. Geological Survey
    Attn: Kara S. Doran
    600 4th Street South
    Saint Petersburg, FL
    UNITED STATES

    727-502-8117 (voice)
    727-502-8001 (FAX)
    kdoran@usgs.gov

Why was the data set created?

To provide alongshore extents of overwash deposits caused by Hurricane Laura.

How was the data set created?

  1. From what previous works were the data drawn?
    NOAA post-storm (source 1 of 2)
    Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Geodetic Survey (NGS), Remote Sensing Division, 20200827, 2020 NOAA NGS Emergency Response Imagery: Hurricane Laura: NOAA's Ocean Service, National Geodetic Survey (NGS), Silver Spring, MD.

    Online Links:

    Type_of_Source_Media: online digital data
    Source_Contribution: Post-storm imagery used to determine overwash extent.
    NOAA pre-storm (source 2 of 2)
    Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Geodetic Survey (NGS), Remote Sensing Division, 201601, Aerial Photography: NOAA Oblique Imagery: NOAA's Ocean Service, National Geodetic Survey (NGS), Silver Spring, MD.

    Online Links:

    Type_of_Source_Media: online digital data
    Source_Contribution: Pre-storm imagery used to determine overwash extent.
  2. How were the data generated, processed, and modified?
    Date: 03-Sep-2020 (process 1 of 4)
    Overwash extents were manually delineated, using ArcMap (10.7.1) by comparing the coastline in Lousiana with pre-storm and post-storm imagery from NOAA. In order to determine whether overwash had occurred in the study area, USGS staff searched for new sand deposits over roads, marshes and vegetation using methods in Birchler and others (2019). Data sources used in this process:
    • NOAA pre-storm
    • NOAA post-storm
    Date: 15-Dec-2020 (process 2 of 4)
    Overwash extents were QA/QC'd by an independent, second researcher at the USGS using NOAA photography to determine if any features were erroneously identified as overwash but were actually dune erosion (Birchler and others, 2019). The final dataset is a polyline shapefile (.shp) that represent the overwash extent from Hurricane Laura in August 2020. Data sources used in this process:
    • NOAA pre-storm
    • NOAA post-storm
    Data sources produced in this process:
    • Laura_Overwash_Extent.shp
    Date: 23-Feb-2021 (process 3 of 4)
    The final overwash extent shapefile was converted to a Zipped Keyhole Markup Language (.kmz) file using tools in Global Mapper 21.1 for use with non-proprietary software. Data sources used in this process:
    • Laura_Overwash_Extent.shp
    Data sources produced in this process:
    • Laura_Overwash_Extent.kmz
    Date: 11-Jun-2024 (process 4 of 4)
    This metadata record was versioned in conjunction with version 3.0 of the data release to remove the USGS obliques source citation.
  3. What similar or related data should the user be aware of?
    Birchler, J.J., Doran, K.S., Long, J.W., and Stockdon, H.F., 2019, Hurricane Matthew: Predictions, Observations, and an Analysis of Coastal Change: U.S. Geological Survey Open-File Report 2019-1095 doi:10.3133/ofr20191095, U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center, St. Petersburg, Florida.

    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?
    No formal horizontal positional accuracy tests were conducted. Geographic coordinates were projected to the North American Datum of 1983 (NAD 83) Universal Transverse Mercator Zone 15 North (UTM 15N) coordinate system.
  3. How accurate are the heights or depths?
    No formal positional vertical accuracy tests were conducted. Data was not projected or referenced to a vertical coordinate system.
  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?
    Data were reviewed for quality analysis/quality control (QA/QC'd) by an independent researcher using NOAA photography.

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 Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. The U.S. Geological Survey requests to be acknowledged as originators of the data in future products or derivative research.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
    Attn: USGS SPCMSC Data Management
    600 4th Street South
    Saint Petersburg, FL

    727-502-8000 (voice)
    gs-g-spcmsc_data_inquiries@usgs.gov
  2. What's the catalog number I need to order this data set? Laura_Overwash_Extent.shp, Laura_Overwash_Extent.kmz
  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: 11-Jun-2024
Metadata author:
U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
Attn: USGS SPCMSC Data Management
600 4th Street South
Saint Petersburg, FL
UNITED STATES

727-502-8000 (voice)
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/Laura_Overwash_Extent_metadata.faq.html>
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