Ground control points at Head of the Meadow Beach, Truro on March 10, 2022

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Frequently anticipated questions:

What does this data set describe?

Title:
Ground control points at Head of the Meadow Beach, Truro on March 10, 2022
Abstract:
These data map the beach and nearshore environment at Head of the Meadow Beach in Truro, MA, providing updated regional context for the 2019 CoastCam installation. CoastCam CACO-01 are two video cameras aimed at the beach that view the coast shared by beachgoers, shorebirds, seals, and sharks. These data were collected as part of field activity 2022-015-FA and a collaboration with the National Park Service at Cape Cod National Seashore to monitor the region. In March 2022, U.S. Geological Survey and Woods Hole Oceanographic Institute (WHOI) scientists conducted field surveys to re-map the field of view of the CoastCam. Aerial images of the beach for use in structure from motion were taken with a camera (Sony a6000) and a post-processed kinematic (PPK) system attached to a helium filled balloon-kite (Helikite). High-precision GPS targets (AeroPoints) and numbered black and white tarps were used as ground control points. Bathymetry was collected in the nearshore using a single-beam echosounder mounted on a surf capable self-righting electric autonomous surface vehicle. Agisoft Metashape (v. 1.8.1) was used to create a digital surface model with the collected imagery, which was merged with the bathymetry in MATLAB (v. 2020b) to create a continuous topobathy product.
Supplemental_Information:
For more information about the WHCMSC Field Activity, see https://cmgds.marine.usgs.gov/fan_info.php?fan=2022-015-FA.
  1. How might this data set be cited?
    Over, Jin-Si R., 20220919, Ground control points at Head of the Meadow Beach, Truro on March 10, 2022: data release DOI:10.5066/P9GEVWG1, U.S. Geological Survey, Coastal and Marine Hazards and Resources Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Over, Jin-Si R., Sherwood, Chris R., and Traykovski, Peter A., 2022, Topographic and bathymetric data, structure from motion imagery, and ground control data collected at Head of the Meadow, Truro, MA in March 2022, U.S. Geological Survey Field Activity 2022-015-FA: data release DOI:10.5066/P9GEVWG1, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details:
    Suggested citation: Over, J.R., Sherwood, C.R., and Traykovski, P.A., 2022, Topographic and bathymetric data, structure from motion imagery, and ground control data collected at Head of the Meadow Beach, Truro, MA in March 2022, U.S. Geological Survey Field Activity 2022-015-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P9GEVWG1.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -70.07899508
    East_Bounding_Coordinate: -70.07521538
    North_Bounding_Coordinate: 42.05274912
    South_Bounding_Coordinate: 42.05013834
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/62e00d3cd34e952be90981fe?name=2022015FA_Truro_nav_browse.JPG&allowOpen=true (JPEG)
    Browse graphic of the spatial distribution of the ground control points at Head of the Meadow, MA
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 10-Mar-2022
    Currentness_Reference:
    ground condition; single survey day: ground control points were used on March 10, 2022.
  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.
    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: 0.999600
      Longitude_of_Central_Meridian: -69.000000
      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 0.001
      Ordinates (y-coordinates) are specified to the nearest 0.001
      Planar coordinates are specified in meters
      The horizontal datum used is North American Datum of 1983 (National Spatial Reference System 2011).
      The ellipsoid used is GRS_1980.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: North American Vertical Datum of 1988 using Geoid 18
      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?
    2022015FA_Truro_nav_GCPs.csv
    Ground control point positions, elevations, and attributes (Source: U.S. Geological Survey)
    INFO
    USGS Field Activity Number (Source: USGS)
    ValueDefinition
    2022-015-FAUSGS year, ID, and Field Activity
    Point_ID
    Unique point identification number. (Source: producer defined)
    Range of values
    Minimum:1
    Maximum:18
    GPS
    Type of GPS processing; Propeller is PPK processing for the AeroPoints and RTK is data from the SP80 base and rover. (Source: producer defined) Character string.
    Attributes
    Unique identifier for ground control points. Prefix AERO### refers to the AeroPoint and the last 3 digits of its identifying code. TAR## refers to the plastic tarp and the number taped onto it. (Source: producer defined) Character string.
    Northing
    Feature location Y-Coordinate (NAD83(2011)/UTM Zone 19N) (Source: USGS)
    Range of values
    Minimum:4655903.086
    Maximum:4656195.459
    Units:meters
    Easting
    Feature location X-Coordinate (NAD83(2011)/UTM Zone 19N) (Source: USGS)
    Range of values
    Minimum:410712.344
    Maximum:411024.163
    Units:meters
    Orthometric_height_NAVD88
    Feature orthometric Z-Coordinate (NAVD88) using GEOID 18 (Source: producer defined)
    Range of values
    Minimum:0.077
    Maximum:8.703
    Units:meters
    Latitude
    Feature location latitude (NAD83(2011)) (Source: USGS)
    Range of values
    Minimum:42.05013834
    Maximum:42.05274912
    Units:decimal degrees
    Longitude
    Feature location longitude (NAD83(2011)) (Source: USGS)
    Range of values
    Minimum:-70.07899508
    Maximum:-70.07521538
    Units:decimal degrees
    Ellipsoid_height_NAD83_2011
    Feature height above the (NAD83(2011) GRS80) ellipsoid. (Source: producer defined)
    Range of values
    Minimum:-27.507
    Maximum:-18.884
    Units:meters
    Date
    Feature date in format YYYYMMDD where YYYY is the year, MM is the month, and DD is the day. (Source: USGS) Character string.
    Time_EST
    Final position collection time in Eastern Standard Time (EST)formatted in HH:MM:SS where HH is the hour, MM is the minute, and SS is the second. (Source: producer defined)
    Range of values
    Minimum:11:38:23
    Maximum:13:07:00
    Units:HH:MM:SS EST
    Xvar_mm
    Variance in the x-coordinate from post-processing. (Source: producer defined)
    ValueDefinition
    NANull value – not calculated.
    Range of values
    Minimum:0.3
    Maximum:7.2
    Units:millimeters
    Yvar_mm
    Variance in the y-coordinate from post-processing. (Source: producer defined)
    ValueDefinition
    NANull value – not calculated
    Range of values
    Minimum:0.2
    Maximum:3.1
    Units:millimeters
    Zvar_mm
    Variance in the z-coordinate from post-processing. (Source: producer defined)
    ValueDefinition
    NANull value – not calculated
    Range of values
    Minimum:0.4
    Maximum:9.5
    Units:millimeters
    Entity_and_Attribute_Overview:
    These attribute definitions describe each column of information in the CSV file. No-data values are ‘NA’
    Entity_and_Attribute_Detail_Citation: USGS Field Activity 2022-015-FA

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Jin-Si R. Over
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Jin-Si R. Over
    U.S. Geological Survey, Woods Hole Coastal and Marine Science Center
    384 Woods Hole Rd.
    Woods Hole, MA

    508-548-8700 x2297 (voice)
    jover@usgs.gov

Why was the data set created?

Ground control points for georeferencing the aerial imagery.

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: 10-Mar-2022 (process 1 of 1)
    The ground control points were processed with the following steps:
    1. Ten AeroPoints and eight plastic tarps were deployed evenly spaced across the survey area. AeroPoints were left on for ~2 hours to collect GNSS data and the numbered plastic tarps were surveyed at their center with the RTK rover connected to the base station.
    2. Once connected to Wifi, the AeroPoint data were uploaded and run through a post-processing kinematic algorithm. The data were exported with xyz variances in the horizontal datum NAD83(2011) to produce latitude, longitude, and ellipsoid heights, and then UTM19N and NAVD88 using GEOID 18 were used to produce orthometric heights. These were exported to a CSV file and combined with the RTK data of the plastic tarps and named 2022015FA_Truro_nav_GCPs.csv. Person who carried out this activity:
    Jin-Si R. Over
    U.S. Geological Survey, Woods Hole Coastal and Marine Science Center
    Geographer
    U.S. Geological Survey
    Woods Hole, MA

    508-548-8700 x2297 (voice)
    jover@usgs.gov
  3. What similar or related data should the user be aware of?
    Over, Jin-Si R., Sherwood, Christopher R., Traykovski, Peter A., Brosnahan, Sandra M., Martini, Marinna A., and Marsjanik, Eric, 2021, Topographic and bathymetric data, sediment samples, and imagery collected at Head of the Meadow Beach, Truro in March 2020, U.S. Geological Survey Field Activity 2020-015-FA: data release DOI:10.5066/P9KSG1RQ, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details:
    This publication is the original/first survey data of Head of the Meadow beach from 2020.
    Over, Jin-Si R., Sherwood, Christopher R., and Traykovski, Peter A., 2022, Topographic and bathymetric data, structure from motion imagery, and ground control data collected at Head of the Meadow, Truro in February 2021, U.S Geological Survey Field Activity 2021-014-FA: data release DOI:10.5066/P9D94NZ3, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details:
    This publication is the 2021 field data at Head of the Meadow Beach.

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

  1. How well have the observations been checked?
    Positions and elevations were produced with variance data by the Propeller Corrections Network (https://www.propelleraero.com/aeropoints-coverage-map/) for the AeroPoints or from the Spectra Precision (SP)80 Rover and Base station setup using Real-time Kinematic (RTK) positioning, which was QA/QC’d with known reference marks.
  2. How accurate are the geographic locations?
    AeroPoint targets have theoretical sub 1 cm horizontal absolute accuracy (see attributes for xy variance in millimeters). RTK positions have a 2 cm horizontal accuracy based on a comparison of measurements taken of known reference marks.
  3. How accurate are the heights or depths?
    AeroPoint targets have theoretical sub 1 cm vertical absolute accuracy (see attributes for z variance in millimeters). RTK positions have a 2 cm vertical accuracy.
  4. Where are the gaps in the data? What is missing?
    There were a total of 18 usable ground control points. AeroPoints were surveyed with the RTK equipment for QC and results were compared to the Propeller Network values; all values were within 2 cm, but the RTK values were less accurate so only the Propeller values were provided for the AeroPoints. 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?
    The file contains USGS field activity 2022-015-FA navigation data: ground control points (AeroPoints) and plastic tarps deployed on March 10 for use in tandem with the aerial imagery.

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. Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Not for navigational use. Please recognize the U.S. Geological Survey (USGS) as the source of this information.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO

    1-888- 275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? 2022015FA_Truro_nav_GCPs.csv contains the ground control point data to be used with the aerial imagery.
  3. What legal disclaimers am I supposed to read?
    Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    none

Who wrote the metadata?

Dates:
Last modified: 19-Sep-2022
Metadata author:
Jin-Si R. Over
U.S. Geological Survey, Woods Hole Coastal and Marine Science Center
Geographer
U.S. Geological Survey
Woods Hole, MA

508-548-8700 x2297 (voice)
whsc_data_contact@usgs.gov
Contact_Instructions:
The metadata contact email address is a generic address in the event the person is no longer with USGS.
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/SB_data_release/DR_P9GEVWG1/2022015FA_Truro_navigation_metadata.faq.html>
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