2012 Post-Hurricane Isaac USGS Lidar-Derived Dune Crest, Toe and Shoreline

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Frequently anticipated questions:

What does this data set describe?

Title:
2012 Post-Hurricane Isaac USGS Lidar-Derived Dune Crest, Toe and Shoreline
Abstract:
The Storm-Induced Coastal Change Hazards component of the National Assessment of Coastal Change Hazards project focuses on understanding the magnitude and variability of extreme storm impacts on sandy beaches. Lidar-derived beach morphologic features such as dune crest, toe and shoreline help define the vulnerability of the beach to storm impacts. This dataset defines the elevation and position of the seaward-most dune crest and toe and the mean high water shoreline derived from the 2012 Post-Hurricane Isaac (Louisiana to Alabama) USGS lidar survey. Beach width is included and is defined as the distance between the dune toe and shoreline along a cross-shore profile. The beach slope is calculated using this beach width and the elevation of the shoreline and dune toe.
  1. How might this data set be cited?
    Doran, Kara S., Long, Joseph W., Stockdon, Hilary F., Birchler, Justin J., Hardy, Matthew W., and Torres, Miguel Loubriel, 20170609, 2012 Post-Hurricane Isaac USGS Lidar-Derived Dune Crest, Toe and Shoreline: U.S. Geological Survey Data Release doi:10.5066/F7GF0S0Z, U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -90.9589
    East_Bounding_Coordinate: -88.0745
    North_Bounding_Coordinate: 30.2525
    South_Bounding_Coordinate: 29.0402
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 05-Sep-2012
    Ending_Date: 11-Oct-2012
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: tabular digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • point (71325)
    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 0.0197843295. Longitudes are given to the nearest 0.0229959585. 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.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: North American Vertical Datum of 1988
      Altitude_Resolution: 0.0001
      Altitude_Distance_Units: meter
      Altitude_Encoding_Method: Attribute values
  7. How does the data set describe geographic features?
    12CNT02_morphology.csv
    Dune crest, toe and shoreline, beach width and mean beach slope. (Source: USGS)
    state
    State segment file identification (ID) number. See data dictionary for details of the numbering system. (Source: USGS)
    Range of values
    Minimum:2
    Maximum:5
    segment
    Segment ID number (Source: USGS)
    Range of values
    Minimum:1
    Maximum:133
    profile
    Grid row number corresponding to a cross-shore profile location. (Source: USGS)
    Range of values
    Minimum:1
    Maximum:1620
    lon
    Feature location longitude (WGS84). (Source: USGS)
    ValueDefinition
    999Null value
    Range of values
    Minimum:-90.9589
    Maximum:-88.0745
    Units:decimal degrees
    lat
    Feature location latitude (WGS84). (Source: USGS)
    ValueDefinition
    999Null value
    Range of values
    Minimum:29.0402
    Maximum:30.2525
    Units:decimal degrees
    x
    Cross-shore feature location. (Source: USGS)
    ValueDefinition
    999Null value
    Range of values
    Minimum:-2307.0669
    Maximum:821.2343
    Units:meters
    z
    Feature elevation (NAVD88). For shorelines, it is the mean-high water elevation. (Source: USGS)
    ValueDefinition
    999Null value
    Range of values
    Minimum:0.23
    Maximum:7.5278
    Units:meters
    x_err
    95% confidence interval for the cross-shore shoreline position (NAVD88). (Source: USGS)
    ValueDefinition
    999Null value
    Range of values
    Minimum:0
    Maximum:1.2136
    Units:meters
    z_err
    Root mean squared vertical error of dune crest (NAVD88). (Source: USGS)
    ValueDefinition
    999Null value
    Range of values
    Minimum:0.0069
    Maximum:1.8366
    Units:meters
    beach_width
    Distance between dune toe and shoreline (NAVD88). (Source: USGS)
    ValueDefinition
    999Null value
    Range of values
    Minimum:4.5640
    Maximum:560.6891
    Units:meters
    slope
    Mean beach slope calculated between dune toe and shoreline (NAVD88). (Source: USGS)
    ValueDefinition
    999Null value
    Range of values
    Minimum:0.0009
    Maximum:0.2161
    Units:radians
    feature_type
    An identifier for the type of feature in the table entry. (Source: USGS)
    ValueDefinition
    DC, DT, SLDune Crest, Dune Toe, Shoreline

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
    • Joseph W. Long
    • Hilary F. Stockdon
    • Justin J. Birchler
    • Matthew W. Hardy
    • Miguel Loubriel Torres
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U.S. Geological Survey
    Attn: Hilary Stockdon
    600 4th Street South
    Saint Petersburg, FL
    UNITED STATES

    727-502-8074 (voice)
    727-502-8001 (FAX)
    hstockdon@usgs.gov

Why was the data set created?

To provide data on the morphology of U.S. sandy beaches. Data were collected during USGS field activity number (FAN) 12CNT02; additional survey details are available at http://cmgds.marine.usgs.gov/fan_info.php?fan=12CNT02.

How was the data set created?

  1. From what previous works were the data drawn?
    12CNT02 (source 1 of 1)
    U.S. Geological Survey (USGS), 20160523, Topographic Lidar Survey of the Alabama, Mississippi, and Southeast Louisiana Barrier Islands, from September 5 to October 11, 2012.

    Online Links:

    Type_of_Source_Media: Online digital data
    Source_Contribution:
    A lidar survey that was used to estimate dune morphology variables.
  2. How were the data generated, processed, and modified?
    Date: Not Complete (process 1 of 1)
    Elevation data points from the lidar survey were interpolated in MATLAB 2014a to a gridded domain (segment) that was rotated parallel to the shoreline and had a resolution of 10 meters (m) in the longshore direction and 2.5 m in the cross-shore direction. The interpolation method applies spatial filtering with a Hanning window that is twice as wide as the grid resolution. Dune crest, toe and shoreline are extracted from the elevation grid in MATLAB every 10 m alongshore (each grid row is a profile). For details on feature extraction see: http://pubs.usgs.gov/of/2012/1084/.
  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?
    Horizontal accuracy is estimated for shorelines only by calculating the 95% confidence interval of the regression line through the shoreline position and is dependent on foreshore slope, scatter in the lidar data points, and specified lidar point uncertainty.
  3. How accurate are the heights or depths?
    Vertical accuracy is determined for each dune crest and toe value based upon the scatter of data in the lidar grid cell.
  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?
    Morphologic features are QA/QC'd in ArcMap and edited in MATLAB, if needed.

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: 12-Jul-2024
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/12CNT02_morphology_metadata.faq.html>
Generated by mp version 2.9.51 on Tue Aug 13 14:14:14 2024