Beach Profile Data Collected from Sand Key Beach in Clearwater, Florida (February 3, 2021)

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Frequently anticipated questions:

What does this data set describe?

Title:
Beach Profile Data Collected from Sand Key Beach in Clearwater, Florida (February 3, 2021)
Abstract:
This dataset, prepared by the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center (SPCMSC), provides beach profile data collected at Sand Key Beach in Clearwater, Florida. Data were collected on foot by a person equipped with a Global Positioning System (GPS) antenna affixed to a backpack outfitted for surveying location and elevation data (XYZ) along pre-determined transects. The horizontal position data are given in the Universal Transverse Mercator (UTM) projected coordinate system, Zone 17 North (17N), referenced to the North American Datum of 1983 (NAD 83); the elevation data are referenced to the North American Vertical Datum of 1988 (NAVD 88), GEOID12B vertical coordinate system.
  1. How might this data set be cited?
    Birchler, Justin J., Brown, Jenna A., and Thompson, David M., 20231213, Beach Profile Data Collected from Sand Key Beach in Clearwater, Florida (February 3, 2021):.

    This is part of the following larger work.

    Birchler, Justin J., Brown, Jenna A., Seymour, Alexander C., and Thompson, David M., 20231213, Beach Profile Data Collected From Sand Key Beach in Clearwater, Florida: U.S. Geological Survey data release doi:10.5066/P9W60EQX, U.S. Geological Survey, St. Petersburg, Florida.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -82.8408964729266
    East_Bounding_Coordinate: -82.8375544311732
    North_Bounding_Coordinate: 27.9434598635821
    South_Bounding_Coordinate: 27.9370234033007
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 03-Feb-2021
    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 (23043)
    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 0.018
      Ordinates (y-coordinates) are specified to the nearest 0.203
      Planar coordinates are specified in meters
      The horizontal datum used is North American Datum 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222101.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: North American Vertical Datum 1988
      Altitude_Resolution: 0.0001
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method: Attribute values
  7. How does the data set describe geographic features?
    20210203_SandKeyFL_XYZ.zip
    Processed beach profile data collected February 3, 2021, from Sand Key Beach in Clearwater, Florida. The location and elevation data are provided in tabular format (.xyz). (Source: U.S. Geological Survey)
    Easting
    UTM x-axis coordinate (NAD 83, UTM Zone 17N) (Source: U.S. Geological Survey)
    Range of values
    Minimum:318876.047
    Maximum:319214.738
    Units:meters
    Northing
    UTM y-axis coordinate (NAD 83, UTM Zone 17N) (Source: U.S. Geological Survey)
    Range of values
    Minimum:3091589.031
    Maximum:3092298.829
    Units:meters
    Elevation
    Orthometric elevation z-coordinate (NAVD 88) (Source: U.S. Geological Survey)
    Range of values
    Minimum:-0.663
    Maximum:2.706
    Units:meters

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Justin J. Birchler
    • Jenna A. Brown
    • David M. Thompson
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
    Attn: Justin J. Birchler
    Physical Scientist
    600 4th Street South
    Saint Petersburg, FL

    727-502-8019 (voice)
    jbirchler@usgs.gov

Why was the data set created?

The purpose of this dataset is to provide geospatial and topographic profile data, in support of a coastal video monitoring station at Sand Key Beach in Clearwater, Florida. Following SPCMSC data management protocols, this survey was assigned a USGS field activity number (FAN), 2021-306-FA. Additional survey and data details are available at https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-306-FA.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 17-Oct-2018 (process 1 of 4)
    PLANNING Transects were created using the MathWorks MATLAB R2016a computing environment. Cross-shore transects were planned perpendicular to the beach by utilizing a measured 2010 lidar shoreline to find an average shoreline angle. Thirty cross-shore transects (lines 1 to 30) are spaced approximately 25 meters (m) apart and span approximately 725 m in the alongshore direction. Five alongshore transects (lines 31 to 35), spanning the length of the study area, are cast approximately 10 m apart in the cross-shore, spanning from the dune toe to the shoreline. Transect line planning was done in a similar way to Henderson and others (2015), the difference being the software used to create the transect lines and spacing of transect lines. Person who carried out this activity:
    U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
    Attn: David M. Thompson
    Physical Scientist
    600 4th Street South
    Saint Petersburg, FL

    727-502-8079 (voice)
    dthompson@usgs.gov
    Date: 03-Feb-2021 (process 2 of 4)
    ACQUISITION Transect lines were surveyed, on foot, by a person equipped with a GPS receiver and a GPS antenna affixed to a SECO© surveying backpack, which was connected to a Windows laptop PC running HYPACK 2016 survey acquisition software. Kinematic GPS data were recorded at 5 Hertz (Hz) with an Ashtech ProFlexTM 500/800 Global Navigation Satellite System (GNSS) receiver and an Ashtech GNSS geodetic survey antenna. The time associated with the beginning and end of surveying each transect line was recorded on the laptop in HYPACK by the surveyor. These data acquisition steps are similar to those reported for the 'Wheel-Mounted GPS' system in Nelson and others (2017), the difference being the GNSS recording interval, GNSS survey equipment model, and that this survey used a backpack-mounted antenna to measure pre-defined transect lines. Person who carried out this activity:
    U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
    Attn: Justin J. Birchler
    Physical Scientist
    600 4th Street South
    Saint Petersburg, FL

    727-502-8019 (voice)
    jbirchler@usgs.gov
    Date: 06-Apr-2021 (process 3 of 4)
    GPS POST-PROCESSING Raw GPS kinematic data recorded on the surveying receiver was post-processed using GNSS post-processing software GrafNav (Waypoint Product Group) version 8.9 to achieve more accurate horizontal position and elevation data. The kinematic GPS data recorded by the surveying receiver were processed in NAD 83 geographic coordinates to concurrent static GPS data recorded by a local base station of known position (NAD 83). The base station used was an Ashtech ProFlexTM 500/800 GNSS receiver and Ashtech GNSS geodetic survey antenna established on the roof of the USGS SPCMSC, also known as ABBY, whose position was determined as the time-weighted average of coordinate values obtained from the National Geodetic Survey's (NGS) On-Line Positioning User Service (OPUS). The final, differentially-corrected, precise GPS positions were exported from GrafNav in American Standard Code for Information Interchange (ASCII) text format, with projected horizontal coordinates in NAD 83, UTM Zone 17N, and vertical coordinates in NAVD 88, GEOID12B. These post-processing steps are similar to those reported in Henderson and others (2015) and Nelson and others (2017). Person who carried out this activity:
    U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
    Attn: Justin J. Birchler
    Physical Scientist
    600 4th Street South
    Saint Petersburg, FL

    727-502-8019 (voice)
    jbirchler@usgs.gov
    Date: 21-Jul-2021 (process 4 of 4)
    DATA PROCESSING Beach profile horizontal position and elevation data for each individual transect were extracted from the post-processed GPS data based on the surveying times recorded with HYPACK using the MathWorks MATLAB R2017a computing environment. The data were smoothed in the cross-shore direction to reduce the noisiness of the highly sampled elevation data, using a moving 1-m wide Hanning filter in MATLAB. The data were quality-controlled in MATLAB to remove invalid data points by eliminating points with poor GPS data quality, visually inspecting plots of horizontal positions and discarding points not on the cross-shore beach profile lines (e.g., points just prior to and just after a transect), and visually inspecting plots of elevation and discarding points with erroneous GPS data (e.g., spikes in the GPS data). Lastly, the elevation data were adjusted by subtracting the elevation of the GPS antenna above the ground, when attached to the surveying backpack, during the survey (1.896 m). The final beach profile data were written to individual text files (.xyz) in tabular format, with columns representing: 1) Easting (NAD83, UTM Zone 17N), 2) Northing (NAD83, UTM Zone 17N), and 3) Orthometric Elevation (NAVD 88, GEOID12B). Person who carried out this activity:
    U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
    Attn: Justin J. Birchler
    Physical Scientist
    600 4th Street South
    Saint Petersburg, FL

    727-502-8019 (voice)
    jbirchler@usgs.gov
  3. What similar or related data should the user be aware of?
    Henderson (Hehre), Rachel E., Hapke, Cheryl J., Brenner, Owen T., and Reynolds, B.J., 20150430, Bathymetry Hurricane Sandy Shoreline Response and Recovery at Fire Island, New York: Shoreline and Beach Profile Data, October 2012 to October 2014: U.S. Geological Survey Data Series doi:10.3133/ds931, U.S. Geological Survey, Reston, Virginia.

    Online Links:

    Nelson, Timothy R., Miselis, Jennifer L., Hapke, Cheryl J., Brenner, Owen T., Henderson, Rachel E., Reynolds, Billy J., and Wilson, Kathleen E., 20170324, Bathymetry Data Collected in October 2014 from Fire Island, New York: The Wilderness Breach, Shoreface, and Bay: U.S. Geological Survey Data Series doi:10.3133/ds1034, U.S. Geological Survey, Reston, Virginia.

    Online Links:

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

  1. How well have the observations been checked?
    Cross-shore profiles were quality checked for accuracy by comparing elevations where cross-shore and alongshore transects overlapped.
  2. How accurate are the geographic locations?
    The horizontal accuracy of the post-processed kinematic GPS data is +/- 2 centimeters (cm), based on the accuracy of the base station used to post-process the data; see the Data_Quality_Information section and Process_Step for more information.
  3. How accurate are the heights or depths?
    The vertical accuracy of the post-processed kinematic GPS data is +/- 3 centimeters (cm), based on the accuracy of the base station used to post-process the data; see the Data_Quality_Information section and Process_Step for more information.
  4. Where are the gaps in the data? What is missing?
    A total of 35 transects (30 cross-shore, 5 alongshore) were planned for the survey, and all transects were collected. 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?
    Cross-shore profiles were quality checked for consistency by comparing elevations to previous or subsequent surveys of the same transects.

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. Please recognize the U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center as the originator of these 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: Justin J. Birchler
    Physical Scientist
    600 4th Street South
    Saint Petersburg, FL

    727-502-8019 (voice)
    jbirchler@usgs.gov
  2. What's the catalog number I need to order this data set? line*.xyz
  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: 14-Nov-2023
Metadata author:
U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
Attn: Justin J. Birchler
Physical Scientist
600 4th Street South
Saint Petersburg, FL

727-502-8019 (voice)
jbirchler@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/20210203_SandKeyFL_XYZ_metadata.faq.html>
Generated by mp version 2.9.51 on Wed Dec 13 14:25:28 2023