GNSS Topography Survey Data Collected from Tres Palmas, Rincón, Puerto Rico

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Frequently anticipated questions:

What does this data set describe?

Title:
GNSS Topography Survey Data Collected from Tres Palmas, Rincón, Puerto Rico
Abstract:
This data release presents the post-processed Global Navigation Satellite System (GNSS) ground-survey data acquired during the installation of a camera system at Tres Palmas, Rincón, Puerto Rico (PR). The data contains topographic survey data collected during the installation of the camera. Data were collected on foot, by a person equipped with a GNSS antenna affixed to a backpack outfitted for surveying location and elevation data (XYZ). The GNSS measurements were made using Post-Processed Kinematic (PPK) corrections referenced to a temporary base station located approximately 250 meters from the study area.
  1. How might this data set be cited?
    Harrison, Shawn R., Buckley, Mark L., Johnson, Cordell, Nowacki, Daniel J., Canals, Miguel, Evans, Colin, Logan, Joshua, Storlazzi, Curt D., Birchler, Justin J., Palmsten, Margaret L., Swanson, Eric, and Johnson, Emily L., 20240510, GNSS Topography Survey Data Collected from Tres Palmas, Rincón, Puerto Rico:.

    This is part of the following larger work.

    Harrison, Shawn R., Buckley, Mark L., Johnson, Cordell, Nowacki, Daniel J., Canals, Miguel, Evans, Colin, Logan, Joshua, Storlazzi, Curt D., Birchler, Justin J., Palmsten, Margaret L., Swanson, Eric, and Johnson, Emily L., 20240510, USGS CoastCam at Tres Palmas, Rincón, Puerto Rico: Calibration and GNSS Topography Survey Data: U.S. Geological Survey data release https://doi.org/10.5066/P142AXUJ, U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center, St. Petersburg, Florida.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -67.26345536
    East_Bounding_Coordinate: -67.26315600
    North_Bounding_Coordinate: 18.34814203
    South_Bounding_Coordinate: 18.34799110
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 21-Jul-2019
    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 (1729)
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 19
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -69.0
      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 0.001
      Ordinates (y-coordinates) are specified to the nearest 0.001
      Planar coordinates are specified in meters
      The horizontal datum used is NAD83 (National Spatial Reference System 2011) (EPSG:6318).
      The ellipsoid used is GRS 1980 (EPSG:7019).
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name:
      Puerto Rico Vertical Datum of 2002 (EPSG:1123), derived using GEOID12B
      Altitude_Resolution: 0.001
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?
    TresPalmasPR_XYZ_20190721.txt
    Processed beach profile data from Tres Palmas, Rincón, Puerto Rico. The location and elevation data are provided in tabular format (.xyz). (Source: U.S. Geological Survey)
    Easting
    Easting coordinate of data point relative to the NAD83 (National Spatial Reference System 2011) reference frame (EPSG:6318), projected in the Universal Transverse Mercator (UTM) Zone 19 North coordinate system (EPSG:26919), in units of meters. (Source: USGS)
    Range of values
    Minimum:683493.770
    Maximum:683525.485
    Units:meters
    Northing
    Northing coordinate of data point relative to the NAD83 (National Spatial Reference System 2011) reference frame (EPSG:6318), projected in the Universal Transverse Mercator (UTM) Zone 19 North coordinate system (EPSG:26919), in units of meters. (Source: USGS)
    Range of values
    Minimum:2029562.193
    Maximum:2029579.070
    Units:meters
    Elevation
    Orthometric height of data point in meters relative to the Puerto Rico Vertical Datum of 2002 (EPSG:1123), derived using GEOID12B. (Source: USGS)
    Range of values
    Minimum:-0.794
    Maximum:4.173
    Units:meters

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Shawn R. Harrison
    • Mark L. Buckley
    • Cordell Johnson
    • Daniel J. Nowacki
    • Miguel Canals
    • Colin Evans
    • Joshua Logan
    • Curt D. Storlazzi
    • Justin J. Birchler
    • Margaret L. Palmsten
    • Eric Swanson
    • Emily L. Johnson
  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: USGS SPCMSC Data Management
    600 4th Street South
    Saint Petersburg, FL
    United States

    727-502-8000 (voice)
    gs-g-spcmsc_data_inquiries@usgs.gov

Why was the data set created?

The purpose of this dataset is to provide geospatial and topographic data, in support of a coastal video monitoring station at Tres Palmas, Rincón, Puerto Rico. Following U.S. Geological Survey (USGS) data management protocols, this survey was assigned a USGS field activity number (FAN), 2019-675-FA. Additional information about the field activity from which these data were derived is available on the Coastal and Marine Geoscience Data System (CMGDS): https://cmgds.marine.usgs.gov/fan_info.php?fan=2019-675-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: 21-Jul-2019 (process 1 of 2)
    ACQUISITION The GNSS ground survey was conducted using a Topcon GRS-1 survey-grade dual-frequency GNSS receiver set to record raw GNSS observables in Post-Processed Kinematic (PPK) mode. Topographic measurements of the ground surface were made using the GNSS receiver mounted on a GNSS-survey backpack and set to collect continuous observations at a rate of 1 hertz (Hz) while the surveyor walked on the ground surface. These data acquisition steps are similar to those reported in Brown and others (2018), the difference being the GNSS recording interval and the GNSS survey equipment model. Person who carried out this activity:
    Joshua Logan
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    2885 Mission Street
    Santa Cruz, CA

    831-460-7519 (voice)
    jlogan@usgs.gov
    Date: 21-Jul-2019 (process 2 of 2)
    GNSS POST-PROCESSING After completion of the survey, the NovAtel Waypoint Grafnav software package was used to derive coordinates for the base reference position using Precise Point Positioning (PPP) for the temporary base station located approximately 250 meters from the study area. The raw recorded GNSS observations were converted from proprietary format to the standard RINEX format using the TEQC software package. The Trimble Business Center ver. 5.00 software package was then used to post process the data using the PPK post processing technique. The final, differentially-corrected, precise GNSS antenna positions were exported in American Standard Code for Information Interchange (ASCII) text format, with projected horizontal coordinates in the North American Datum of 1983 (National Spatial Reference System 2011) Universal Transverse Mercator Zone 19 North (NAD83(2011)/UTM Zone 19N) coordinate system, and vertical coordinates in the Puerto Rico Vertical Datum of 2002 (PRVD02), GEOID12B. These post-processing steps are similar to those reported in Brown and others (2018). Ground elevations were determined by subtracting the GNSS antenna height above the ground. The final beach profile data were written to a text file (.xyz) in tabular format, with columns representing: 1) Easting (NAD83, UTM Zone 19N), 2) Northing (NAD83, UTM Zone 19N), and 3) Orthometric Elevation (PRVD 02, GEOID12B). Person who carried out this activity:
    Joshua Logan
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    2885 Mission Street
    Santa Cruz, CA

    831-460-7519 (voice)
    jlogan@usgs.gov
  3. What similar or related data should the user be aware of?
    Brown, Jennifer A., Birchler, Justin J., Thompson, David M., Long, Joseph W., and Seymour, Alexander C., 20180314, Beach profile data collected from Madeira Beach, Florida: U.S. Geological Survey data release https://doi.org/10.5066/F7T43S94, U.S. Geological Survey, St. Petersburg, Florida.

    Online Links:

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

  1. How well have the observations been checked?
    No formal attribute accuracy tests were conducted.
  2. How accurate are the geographic locations?
    These survey data were measured using survey-grade dual-frequency GNSS receivers operating in Post-Processed Kinematic (PPK) mode using corrections referenced to a temporary base station located approximately 250 meters from the study area. The reference position of the base station was established using the mean position of four static occupations (each lasting between three and five hours, conducted during two days of surveying) derived using Precise Point Positioning (PPP). The standard deviation of the horizontal coordinates derived for the base station was 0.025 meters. The mean reported horizontal precision of the rover measurements was 0.008 meters (with a standard deviation of 0.004 meters). The magnitude of additional errors resulting from uncertainty in the base station reference position, antenna height measurement errors, and errors resulting from varying posture and sinking in sand during backpack surveying are unknown.
  3. How accurate are the heights or depths?
    These survey data were measured using survey-grade dual-frequency GNSS receivers operating in Post-Processed Kinematic (PPK) mode using corrections referenced to a temporary base station located approximately 250 meters from the study area. The reference position of the base station was established using the mean position of four static occupations (each lasting between three and five hours, conducted during two days of surveying) derived using Precise Point Positioning (PPP). The standard deviation of the vertical coordinates derived for the base station was 0.023 meters. The mean reported horizontal precision of the rover measurements was 0.018 meters (with a standard deviation of 0.010 meters). The magnitude of additional errors resulting from uncertainty in the base station reference position, antenna height measurement errors, and errors resulting from varying posture and sinking in sand during backpack surveying are unknown.
  4. Where are the gaps in the data? What is missing?
    Dataset is considered complete for the information presented, as described in the abstract. 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?
    No formal logical accuracy tests were conducted.

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: USGS SPCMSC Data Management
    600 4th Street South
    Saint Petersburg, FL
    United States

    727-502-8000 (voice)
    gs-g-spcmsc_data_inquiries@usgs.gov
  2. What's the catalog number I need to order this data set? TresPalmasPR_XYZ_20190721.txt
  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: 10-May-2024
Metadata author:
U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
Attn: USGS SPCMSC Data Management
600 4th Street South
Saint Petersburg, FL
United States

727-502-8000 (voice)
gs-g-spcmsc_data_inquiries@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/TresPalmasPR_XYZ_20190721_metadata.faq.html>
Generated by mp version 2.9.51 on Fri May 10 10:13:00 2024