Hurricane Florence Overwash Extents

Metadata also available as - [Outline] - [Parseable text] - [XML]

Frequently anticipated questions:


What does this data set describe?

Title: Hurricane Florence Overwash Extents
Abstract:
The National Assessment of Coastal Change Hazards project 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 southeast coast of the United States from North Carolina to Virginia and attributed to coastal processes during [Atlantic Basin] Hurricane Florence, which made landfall in the U.S. on September 14, 2018.
  1. How might this data set be cited?
    Doran, Kara S., Birchler, Justin J., and Bendik, Kirsten J., 20190813, Hurricane Florence 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: -78.506710
    East_Bounding_Coordinate: -75.461079
    North_Bounding_Coordinate: 36.919598
    South_Bounding_Coordinate: 33.856056
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 14-Sep-2018
    Ending_Date: 15-Sep-2018
    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 (693)
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 17
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -81.0
      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?
    Florence_overwash_extent.shp
    Overwash extents for Hurricane Florence. (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.
    OBJECTID
    Overwash segment identification number. (Source: Esri)
    Range of values
    Minimum:1
    Maximum:938
    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
    MARSH, ROADThe substrate onto which overwash sediments are deposited.
    SHAPE_Leng
    Length of line segment, in meters. (Source: Esri)
    Range of values
    Minimum:10.852474
    Maximum:5829.718905
    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 Florence.

How was the data set created?

  1. From what previous works were the data drawn?
    NOAA post-storm (source 1 of 3)
    Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Geodetic Survey (NGS), Remote Sensing Division, 201809, Hurricane Florence: Emergency Response Imagery of the Surrounding Regions: 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 3)
    Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Geodetic Survey (NGS), Remote Sensing Division, 201610, Hurricane Matthew: Rapid Response Imagery of the Surrounding Regions: 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 whether overwash occurred.
    USGS obliques (source 3 of 3)
    U.S. Geological Survey, Unpublished material, Hurricane Florence oblique aerial photography.

    Type_of_Source_Media: aerial photos
    Source_Contribution:
    USGS low-angle oblique photographs of the coast taken after the storm (Hurricane Florence) were used to verify that areas identified as overwash were indeed overwash and not dune erosion and scarping. In many instances, dune erosion and overwash leave sand deposits that appear similar in high-angle imagery.
  2. How were the data generated, processed, and modified?
    Date: 18-Apr-2019 (process 1 of 3)
    Overwash extents were delineated, by hand, using ArcMap (10.5.1) and comparisons of pre-storm and post-storm imagery. In order to determine whether overwash had occurred, USGS staff searched for new sand deposits over roads, marshes and vegetation.
    Date: 18-Apr-2019 (process 2 of 3)
    Overwash extents were QA/QC'd by an independent, second researcher using low-angle oblique photography to determine if any features were erroneously identified as overwash but were actually dune erosion.
    Date: 10-Jul-2019 (process 3 of 3)
    The final .shp file was copied and converted to a .kmz file (Global Mapper 20.1) for use with non-proprietary software.
  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?
  2. How accurate are the geographic locations?
    No formal horizontal positional accuracy tests were conducted.
  3. How accurate are the heights or depths?
    No formal positional vertical accuracy tests were conducted
  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 QA/QC'd by an independent researcher using USGS oblique aerial 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
    Attn: Kara S. Doran
    600 4th Street South
    Saint Petersburg, FL

    727-502-8117 (voice)
    727-502-8001 (FAX)
    kdoran@usgs.gov
  2. What's the catalog number I need to order this data set?
  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-May-2021
Metadata author:
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
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/Florence_Overwash_Extent_metadata.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:18:49 2021