USGS CoastCam at Waiakāne, Moloka'i, Hawai'i: 2018 GNSS Topography Survey Data

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Frequently anticipated questions:

What does this data set describe?

Title:
USGS CoastCam at Waiakāne, Moloka'i, Hawai'i: 2018 GNSS Topography Survey Data
Abstract:
This data release presents the post-processed global navigation satellite system (GNSS) ground-survey data acquired during the installation of the Argus camera at Waiakāne, Moloka'i, Hawai'i. 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 from a GNSS base station occupying a temporary benchmark (MK02) located approximately 1 kilometer (km) from the study area.
  1. How might this data set be cited?
    Buckley, Mark L., Logan, Joshua, and Birchler, Justin J., 20240510, USGS CoastCam at Waiakāne, Moloka'i, Hawai'i: 2018 GNSS Topography Survey Data:.

    This is part of the following larger work.

    Harrison, Shawn R., Buckley, Mark L., Logan, Joshua, Pomeroy, Andrew W.M., Storlazzi, Curt D., Birchler, Justin J., Palmsten, Margaret L., Swanson, Eric, and Johnson, Emily L., 20240510, USGS CoastCam at Waiakāne, Moloka'i, Hawai'i: 2018 Calibration and GNSS Topography Survey Data: U.S. Geological Survey data release doi:10.5066/P13XN6KM, 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: -157.1577864
    East_Bounding_Coordinate: -157.1504411
    North_Bounding_Coordinate: 21.09306181
    South_Bounding_Coordinate: 21.09235075
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 21-Jun-2018
    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 (1470)
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 4
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -159.0
      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 PA11) (EPSG:6321).
      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: Local mean sea level, 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?
    MolokaiHI_XYZ_20180626.zip
    Processed beach profile data collected June 26, 2018, from Waiakāne, Moloka'i, Hawai'i. 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 PA11) reference frame (EPSG:6321), projected in the Universal Transverse Mercator (UTM) Zone 4 North coordinate system (EPSG:6634), in units of meters. (Source: USGS)
    Range of values
    Minimum:691365.099
    Maximum:692128.592
    Units:meters
    Northing
    Northing coordinate of data point relative to the NAD83 (National Spatial Reference System PA11) reference frame (EPSG:6321), projected in the Universal Transverse Mercator (UTM) Zone 4 North coordinate system (EPSG:6634), in units of meters. (Source: USGS)
    Range of values
    Minimum:2333479.079
    Maximum:2333558.178
    Units:meters
    Elevation
    Orthometric height of data point in meters relative to local mean sea level, derived using GEOID12B (Source: USGS)
    Range of values
    Minimum:-0.091
    Maximum:1.986
    Units:meters

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Mark L. Buckley
    • Joshua Logan
    • Justin J. Birchler
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    USGS SPCMSC Data Management Group
    U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
    600 4th Street South
    St. Petersburg, Florida
    USA

    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 Waiakāne, Moloka'i, Hawai'i. Following U.S. Geological Survey (USGS) data management protocols, this survey was assigned a USGS field activity number (FAN), 2018-617-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=2018-617-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: 26-Jun-2018 (process 1 of 2)
    ACQUISITION The GNSS ground survey was conducted using a Trimble R7 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: 26-Jun-2018 (process 2 of 2)
    GNSS POST-PROCESSING A second GNSS receiver, serving as a base station, was placed on a fixed-height rod and placed on a temporary benchmark (MK02) approximately 1 kilometer from the survey area. The base receiver was programmed to record raw GNSS observations during survey operations. Reference coordinates for MK02 were established using the mean position derived from four static GNSS occupations with durations greater than 4 hours each submitted to the National Geodetic Survey Online Positioning User Service (NGS OPUS). These data were then used to post-process the GNSS measurements using the Trimble Business Center ver. 4.30 software package. The differentially-corrected, precise GNSS antenna positions were exported in American Standard Code for Information Interchange (ASCII) text format, with projected horizontal coordinates in NAD 83, UTM Zone 4N, and orthometric elevation in 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. Following OCM Partners (2024), the orthometric elevation was converted from GEOID12B to a local mean sea level by subtracting 0.601 meters. The GEOID12B to local mean sea level vertical adjustment for Moloka'i was derived by OCM Partners (2024) from published National Geodetic Survey control point datasheets. The final beach profile data were written to a text file (.xyz) in tabular format, with columns representing: 1) Easting (NAD83, UTM Zone 4N), 2) Northing (NAD83, UTM Zone 4N), and 3) Orthometric Elevation (local mean sea level, 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:

    Partners, OCM, 20240110, 2013 USACE NCMP Topobathy Lidar DEM (LMSL): Molokai, HI: National Oceanic and Atmospheric Administration, online.

    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 GNSS base station occupying a temporary benchmark (MK02) located approximately 1 kilometer (km) from the study area. Reference coordinates for MK02 were established using the mean position derived from four static GNSS occupations with durations greater than 4 hours each submitted to the National Geodetic Survey Online Positioning User Service (NGS OPUS). The standard deviation of the four OPUS-derived horizontal positions was 0.004 meters. The mean reported horizontal precision of the PPK measurements was 0.015 meters (standard deviation of 0.002). 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. Horizontal coordinates are referenced to the North American Datum of 1983 (National Spatial Reference System PA11) Universal Transverse Mercator Zone 4 North (NAD83(PA11)/UTM Zone 4N) coordinate system, with a resolution of 0.001 meters.
  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 GNSS base station occupying a temporary benchmark (MK02) located approximately 1 kilometer (km) from the study area. Reference coordinates for MK02 were established using the mean position derived from four static GNSS occupations with durations greater than 4 hours each submitted to the National Geodetic Survey Online Positioning User Service (NGS OPUS). The standard deviation of the four OPUS-derived vertical positions was 0.008 meters. The mean reported vertical precision of the PPK measurements was 0.022 meters (standard deviation of 0.002). 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. Vertical positions are orthometric heights relative to local mean sea level, derived using GEOID12B, coordinate system, with a resolution of 0.001 meters.
  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)
    USGS SPCMSC Data Management Group
    U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
    600 4th Street South
    St. Petersburg, Florida
    USA

    727-502-8000 (voice)
    gs-g-spcmsc_data_inquiries@usgs.gov
  2. What's the catalog number I need to order this data set? MolokaiHI_XYZ_20180626.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:
USGS SPCMSC Data Management Group
U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
600 4th Street South
Saint Petersburg, FL
USA

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/MolokaiHI_XYZ_20180626_metadata.faq.html>
Generated by mp version 2.9.51 on Fri May 10 11:46:18 2024