Hurricane Matthew Overwash Extents

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Frequently anticipated questions:

What does this data set describe?

Title: Hurricane Matthew 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 Florida to North Carolina and attributed to coastal processes during [Atlantic Basin] Hurricane Matthew, which made landfall in the U.S. on October 8, 2016.
  1. How might this data set be cited?
    Doran, Kara S., Birchler, Justin J., Tiling-Range, Ginger, and Long, Joseph W., 20170420, Hurricane Matthew Overwash Extents: U.S. Geological Survey Data Release doi:10.5066/F7W09433, U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -81.439566
    East_Bounding_Coordinate: -75.461421
    North_Bounding_Coordinate: 36.500588
    South_Bounding_Coordinate: 26.311691
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 07-Oct-2016
    Ending_Date: 10-Oct-2016
    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 (330)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.0197833908. Longitudes are given to the nearest 0.0230564530. Latitude and longitude values are specified in Decimal Degrees. The horizontal datum used is D WGS 1984.
      The ellipsoid used is WGS 1984.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257223563.
  7. How does the data set describe geographic features?
    Hurricane_Matthew_Overwash_Extent.shp
    Overwash extents for Hurricane Matthew. (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.
    extent
    A note is inserted here if the overwash extent covered a road or marsh. If the field is blank, the overwash deposit did not cover any roads or marshes. (Source: USGS)
    ValueDefinition
    Marsh, road, railroad, walkwayThe extent of the overwash deposit onto marshes, roads, railroads or walkways.
    SHAPE_Leng
    length of line segment in decimal degrees (Source: Esri)
    Range of values
    Minimum:0.000204
    Maximum:0.073451
    length_met
    length of line segment in meters (Source: Esri)
    Range of values
    Minimum:25
    Maximum:9228.700195
    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
    • Ginger Tiling-Range
    • Joseph W. Long
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U.S. Geological Survey
    Attn: Kara 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 caused by Hurricane Matthew.

How was the data set created?

  1. From what previous works were the data drawn?
    NOAA post (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, 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: 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, 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 whether overwash occurred
    USGS obliques (source 3 of 3)
    U.S. Geological Survey, 20170420, Hurricane Matthew oblique aerial photography.

    Online Links:

    Type_of_Source_Media: online digital data
    Source_Contribution:
    USGS low-angle oblique photographs of the coast taken after the storm 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: 28-Nov-2016 (process 1 of 3)
    Overwash extents are delineated by hand using ArcMap (10.2.2) and comparing pre-storm imagery with post-storm imagery to determine whether overwash has occurred. Users are looking for new sand deposits over roads, marshes and vegetation.
    Date: 28-Nov-2016 (process 2 of 3)
    Overwash extents were QA/QC'd by an independent second researcher using low-angle oblique photography to determine if they were erroneously identified as overwash but were actually dune erosion.
    Date: 13-Oct-2020 (process 3 of 3)
    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?

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-Oct-2020
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/Hurricane_Matthew_Overwash_Extent_metadata.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:18:50 2021