Wilderness Breach Ground Based XYZ Point Bathymetry Data Collected in June 2014 from Fire Island, New York

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Frequently anticipated questions:

What does this data set describe?

Title:
Wilderness Breach Ground Based XYZ Point Bathymetry Data Collected in June 2014 from Fire Island, New York
Abstract:
Scientists from the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center in St. Petersburg, Florida, collected bathymetric data along the upper shoreface and within the wilderness breach at Fire Island, New York, in June 2014. The U.S. Geological Survey is involved in a post-Hurricane Sandy effort to map and monitor the morphologic evolution of the shoreface along Fire Island and model the evolution of the wilderness breach as a part of the Hurricane Sandy Supplemental Project GS2-2B.During this study, bathymetry was collected with single-beam echo sounders and global positioning systems, mounted to personal watercraft, along the Fire Island shoreface and within the wilderness breach. Additional bathymetry was collected using backpack global positioning systems along the flood shoals and shallow channels within the wilderness breach.
  1. How might this data set be cited?
    U.S. Geological Survey, 20160707, Wilderness Breach Ground Based XYZ Point Bathymetry Data Collected in June 2014 from Fire Island, New York: U.S. Geological Survey Data Series DS 1007, St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL.

    Online Links:

    This is part of the following larger work.

    Nelson, Timothy R., Miselis, Jennifer L., Hapke, Cheryl J., Wilson, Kathleen E., Henderson, Rachel E., Brenner, Owen T., Reynolds, Billy J., and Hansen, Mark E., 20160707, Coastal Bathymetry Data Collected in June 2014 from Fire Island, New York: the Wilderness Breach and Shoreface: U.S. Geological Survey Data Series DS 1007, St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -72.906476
    East_Bounding_Coordinate: -72.889222
    North_Bounding_Coordinate: 40.739707
    South_Bounding_Coordinate: 40.720330
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 10-Jun-2014
    Ending_Date: 20-Jun-2014
    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 (37,270)
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 18
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -75.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000
      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 1.000000
      Ordinates (y-coordinates) are specified to the nearest 1.000000
      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: 0.001 m
      Altitude_Distance_Units: meter
      Altitude_Encoding_Method: Attribute values
  7. How does the data set describe geographic features?
    201406_Ground_Based_XYZ.csv
    Comma delimited xyz file (Source: U.S. Geological Survey)
    Easting_m
    NAD83 UTM x-axis coordinate (Zone 18) (Source: U.S. Geological Survey)
    Range of values
    Minimum:676815
    Maximum:678223
    Units:Meter
    Northing_m
    NAD83 UTM y-axis coordinate (Zone 18N) (Source: U.S. Geological Survey)
    Range of values
    Minimum:4509853
    Maximum:4511972
    Units:Meter
    elevation
    z-value (elevation) in NAVD88 (Source: U.S. Geological Survey)
    Range of values
    Minimum:-3.016
    Maximum:0.572
    Units:Meter
    Date
    Date of Sample (Source: U.S. Geological Survey)
    Range of values
    Minimum:16 June 2014
    Maximum:19 June 2014
    Entity_and_Attribute_Overview:
    Comma delimited xyz file containing UTM X, UTM Y locations and corresponding Z elevation value, all in meters.
    Entity_and_Attribute_Detail_Citation:
    Coastal bathymetry point data for Fire Island, N.Y., created from data collected between June 10, 2014, and June 20, 2014.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • U.S. Geological Survey
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U.S. Geological Survey
    Attn: Timothy R. Nelson
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8098 (voice)
    727-502-8182 (FAX)
    trnelson@usgs.gov

Why was the data set created?

To determine the change Hurricane Sandy caused in the shoreface morphology and breach evolution at Fire Island, New York, USA, scientists from the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center (SPCMSC) conducted a bathymetric survey of Fire Island from June 10-20, 2014. The objectives of the data collection effort were to map the morphology of the shoreface and the wilderness breach as part of the USGS Hurricane Sandy Supplemental Project GS2-2B. This dataset, 201406_Ground_Based_XYZ.zip, consists of elevation data collected with a backpack GPS system from subaerial and shallow flood shoals.

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: 2014 (process 1 of 6)
    GPS Acquisition: GPS base stations were erected at benchmarks REST (near the town of Robins Rest) and U374 (NGS benchmark Permanent Identification number (PID#) KU0206) located on Fire Island. Base stations were equipped with Ashtech ProFlex 500 Global Navigation Satellite System (GNSS) receivers. The survey backpack (rover) was equipped with an Ashtech Z-Xtreme(TM) receiver. The base and rover receivers recorded their positions concurrently at 10 Hertz (Hz) throughout the survey. Reference station coordinates were verified with Continuously Operating Reference Station (CORS) sites using the Online Positioning User Service (OPUS), available at http://www.ngs.noaa.gov/OPUS/). U374 used reference stations ZNY1, NYRH, CTDA, while REST used stations NYCI, NYRH, and MOR6. OPUS computed both reference stations had horizontal errors of 0.4 cm and vertical errors of 0.2 cm. Person who carried out this activity:
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Attn: Mark E. Hansen
    Oceanographer
    600 4th St. S
    Saint Petersburg, FL
    USA

    727-502-8036 (voice)
    727-502-8182 (FAX)
    mhansen@usgs.gov
    Date: 2014 (process 2 of 6)
    Ground Based Mapping: Elevation data were collected using an Ashtech Z-Xtreme GPS receiver mounted in a SECO backpack using Ashtech Marine antennas attached to a pole that extended above the head of the surveyor. The relative elevation of the antenna to the ground was measured for each surveyor in a walking-stride position that varied between 1.67 and 1.7 m. The surveyors did not follow a pre-defined path but collected data over as much of the subaerial and shallow shoals as possible during low-tide. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Owen T. Brenner
    Geologist
    600 4th St. South
    St. Petersburg, FL
    USA

    727-502-8085 (voice)
    727-502-8182 (FAX)
    obrenner@usgs.gov
    Date: 2014 (process 3 of 6)
    Ground Based Differentially Corrected Navigation Processing: Locations associated with backpack position were post-processed using a differential correction derived from the base/rover setup. The base station coordinates were imported into GrafNav version 8.5 (Waypoint Product Group) and the GPS data from the backpack and wheel-mounted surveys were processed to the concurrent GPS session data at the base stations. The horizontal and vertical coordinates of the backpack and wheel-mounted data points were saved in NAD83 and NAVD88 and exported as ASCII files. Person who carried out this activity:
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Attn: Billy J. Reynolds
    Engineering Technician
    600 4th St. South
    Saint Petersburg, FL
    USA

    727-502-8067 (voice)
    727-502-8181 (FAX)
    breynolds@usgs.gov
    Date: 2014 (process 4 of 6)
    Ground-Based Data Processing: Using ArcGIS, erroneous ground-based horizontal and vertical positions, such as when the backpack was removed and when the surveyor was transported between shoals, were removed. Once all extraneous data points were removed, the remaining data were saved as an ASCII file. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Owen T. Brenner
    Geologist
    600 4th St. South
    St. Petersburg, FL
    USA

    727-502-8085 (voice)
    727-502-8182 (FAX)
    obrenner@usgs.gov
    Date: 2015 (process 5 of 6)
    Ground-Based Error Analysis: Using Matlab R2015b Ground-based GPS elevation errors were calculated by computing the vertical differences at crossings that occurred at least 1 minute apart. An RMS error of 24.9 cm was calculated based on 210 crossings. Elevation differences between the ground-based and single-beam data points (487 samples within 50 cm) indicated the ground-based elevations were 6 cm higher than elevations recorded using PWCs. Given the high degree of uncertainty arising from of the backpack surveyor striding over a subaqueous surface, the ground-based data were adjusted to the single-beam elevation at the crossings. The adjusted positions, elevation, and time of sampling were saved as an ASCII file. Person who carried out this activity:
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Attn: Mark E. Hansen
    Oceanographer
    600 4th St. South
    Saint Petersburg, FL
    USA

    727-502- 8036 (voice)
    727-502-8182 (FAX)
    mhansen@usgs.gov
    Date: 13-Oct-2020 (process 6 of 6)
    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?
    The accuracy of the data is determined during data collection. This dataset is derived from a single field survey using identical equipment, set-ups, and staff; therefore, the dataset is internally consistent. Methods are employed to maintain data collection consistency aboard the platform. During mobilization, each piece of equipment is isolated to obtain internal and external offset measurements with respect to the survey mount. All the critical measurements are recorded manually and digitally entered into their respective programs. For ground-based measurements, elevation between the ground and antenna was measured for each surveyor in a walking stride and accounted for during post-processing. For the base stations, the Ashtech ProFlex 500 system has a long static horizontal accuracy of 0.3 centimeters (cm) and 0.6 cm vertical accuracy. For the rovers, the Ashtech Z-Xtreme post-processed kinematic horizontal instrument accuracy is 1 cm, and vertical accuracy is 2 cm.
  2. How accurate are the geographic locations?
    The GPS antenna and receiver acquisition configuration used at the reference station was duplicated on the survey vessel (rover). The base receiver and the rover receiver record their positions concurrently at 10Hz recording intervals throughout the survey. All processed measurements are referenced to the base station coordinates. All static base station GPS sessions were submitted for processing to the National Oceanographic and Atmospheric Administration (NOAA) and National Geodetic Survey (NGS) On-Line Positioning User Service (OPUS) software. OPUS results provide an error measurement for each daily solution with a horizontal accuracy estimated as 0.7 cm root mean squared (RMS). Rover kinematic (rover) GPS data was processed with GrafNav v8.50 software by Novatel. The combined horizontal error for the rover is assumed to be at most half of the calculated vertical uncertainty.
  3. How accurate are the heights or depths?
    The GPS antenna and receiver acquisition configuration used at the reference station was duplicated on the survey vessel (rover). The base receiver and the rover receiver record the positions concurrently at 10Hz recording intervals throughout the survey. All processed measurements are referenced to the base station coordinates. OPUS results provide an error measurement for each daily solution. Applying these error measurements, the vertical accuracy of the base station is estimated to be 0.7 cm root mean squared (RMS).The kinematic (rover) trajectories were processed using GrafNav v8.50 software by Novatel, Inc. Ground-based GPS elevation errors were calculated by computing the RMS vertical elevation differences at crossings that occurred at least 1 minute apart. The combined vertical uncertainty from base station coordinate solutions and rover trajectories is 24.9 cm.
  4. Where are the gaps in the data? What is missing?
    This zip archive contains post-processed horizontal position and vertical elevation point data (x,y,z) acquired with a backpack mounted GPS along the shoreface of Fire Island and the wilderness breach. This dataset is considered complete for the information presented, as described in the abstract section. Users are advised to read online Data Series and the rest of the metadata record carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    The U.S. Geological Survey St. Petersburg Coastal and Marine Science Center collected shallow water bathymetric data of the shoreface and the wilderness breach on Fire Island, New York, in June 2014.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints:
The U.S. Geological Survey requests that it be referenced as the originator of this dataset in any future products or research derived from these data.
Use_Constraints: These data should not be used for navigational purposes.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey, St Petersburg Coastal and Marine Science Center, St. Petersburg, FL
    Attn: Timothy R. Nelson
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8098 (voice)
    727-502-8182 (FAX)
    trnelson@usgs.gov
  2. What's the catalog number I need to order this data set? U.S. Geological Survey DS 1007
  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: 22-Sep-2021
Last Reviewed: 29-Jan-2016
Metadata author:
U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
Attn: Kathleen E. Wilson
Researcher
600 4th Street South
St. Petersburg, Florida
U.S.

727-502-8099 (voice)
727-502-8182 (FAX)
kwilson@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/DS1007_201406_Ground_Based_XYZ.faq.html>
Generated by mp version 2.9.50 on Wed Sep 22 17:19:08 2021