Ground control points Head of the Meadow Beach, Truro, MA on March 10, 2023

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Frequently anticipated questions:

What does this data set describe?

Title:
Ground control points Head of the Meadow Beach, Truro, MA on March 10, 2023
Abstract:
The data in this release re-map the beach and nearshore environment at Head of the Meadow Beach in Truro, MA and provide updated environmental context for the 2020 CoastCam installation that looks out at the coast shared by beachgoers, shorebirds, seals, and sharks. This is related to the field activity 2022-015-FA and a collaboration with the National Park Service at Cape Cod National Seashore to monitor the region that falls within the field of view of CoastCam CACO-01, which are two video cameras aimed at the beach. In March and April 2023, U.S. Geological Survey and Woods Hole Oceanographic Institute (WHOI) scientists conducted field surveys to collect topographic and bathymetric data. 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 powered 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 and orthomosaic with the collected imagery.
Supplemental_Information:
For more information about the WHCMSC Field Activity, see https://cmgds.marine.usgs.gov/fan_info.php?fan=2023-011-FA.
  1. How might this data set be cited?
    Over, Jin-Si R., 20230725, Ground control points Head of the Meadow Beach, Truro, MA on March 10, 2023: data release DOI:10.5066/P9FYVLCD, 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., 2023, Topographic and bathymetric data, structure from motion imagery, and ground control data collected at Head of the Meadow Beach, Truro, Massachusetts in March and April 2023, U.S. Geological Survey Field Activity 2023-011-FA.: data release DOI:10.5066/P9FYVLCD, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details:
    Suggested citation: Over, J.R., Sherwood, C.R., and Traykovski, P.A., 2023, Topographic and bathymetric data, structure from motion imagery, and ground control data collected at Head of the Meadow Beach, Truro, Massachusetts in March and April 2023, U.S. Geological Survey Field Activity 2023-011-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P9FYVLCD.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -70.07866616
    East_Bounding_Coordinate: -70.07603475
    North_Bounding_Coordinate: 42.05209753
    South_Bounding_Coordinate: 42.05021380
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/646515e6d34ec179a83dc2e1?name=2023-011-FA_Truro_nav_browse.JPG&allowOpen=true (JPEG)
    Browse graphic of the spatial distribution of the ground control points.
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 10-Mar-2023
    Currentness_Reference:
    ground condition; one day of data collection on March 10, 2023
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: tabular 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 (10)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.00000001. Longitudes are given to the nearest 0.00000001. Latitude and longitude values are specified in Decimal degrees. 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 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: North American Vertical Datum of 1988
      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?
    2023-011-FA_Truro_nav_GCPs.csv
    Ground control point positions, elevations, and attributes (Source: USGS)
    FAN
    USGS Field Activity Number (Source: USGS)
    ValueDefinition
    2023-011-FAYear, USGS ID, and Field Activity
    Point ID
    Unique point identification number. (Source: Processor defined)
    Range of values
    Minimum:1
    Maximum:10
    Attributes
    Unique identifier for ground control points. Prefix AERO### refers to the AeroPoints and the last 3 digits of its identifying code. (Source: producer defined) Character string.
    Latitude NAD83[2011]
    Post-processed latitude of AeroPoint position (NAD83[2011]). (Source: USGS)
    Range of values
    Minimum:42.05021380
    Maximum:42.05209753
    Units:decimal degrees
    Longtitude NAD83[2011]
    Post-processed longitude of AeroPoint position (NAD83[2011]). (Source: None)
    Range of values
    Minimum:-70.07866616
    Maximum:-70.07603475
    Units:decimal degrees
    Ellipsoid height NAD83[2011]
    Post-processed height in meters of AeroPoint on the NAD83(2011) reference ellipsoid. (Source: None)
    Range of values
    Minimum:-23.979
    Maximum:-19.378
    Units:meters
    Northing 19N
    Post-processed interpolated X-coordinate of AeroPoint in NAD83(2011)/UTM Zone 19N. (Source: USGS)
    Range of values
    Minimum:4655911.532
    Maximum:4656123.237
    Units:meters
    Easting 19N
    Post-processed interpolated Y-coordinate of AeroPoint in NAD83(2011)/UTM Zone 19N. (Source: USGS)
    Range of values
    Minimum:410738.908
    Maximum:410955.576
    Units:meters
    Orthometric height NAVD88
    Post-processed Z-coordinate of AeroPoint using NAVD88 Geoid 18. (Source: USGS)
    Range of values
    Minimum:3.605
    Maximum:8.209
    Units:meters
    Xvar mm
    Variance in the X-coordinate from post-processing (Source: producer defined)
    Range of values
    Minimum:0.6
    Maximum:2.6
    Units:millimeters
    Yvar mm
    Variance in the Y-coordinate from post-processing (Source: producer defined)
    Range of values
    Minimum:0.7
    Maximum:6.2
    Units:millimeters
    Zvar mm
    Variance in the Z-coordinate from post-processing (Source: producer defined)
    Range of values
    Minimum:0.6
    Maximum:4.9
    Units:millimeters
    Baseline distance km
    distance of AeroPoint from nearest used processing network base station (Source: Propeller)
    Range of values
    Minimum:0.04
    Maximum:9.44
    Units:kilometers
    Entity_and_Attribute_Overview:
    These attribute definitions describe each column of information in the CSV file of the AeroPoint GCP information.
    Entity_and_Attribute_Detail_Citation: USGS Field Activity 2023-011-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
    Geographer
    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: Apr-2023 (process 1 of 1)
    The ground control points were processed with the following steps:
    1. Ten AeroPoints were deployed evenly spaced across the survey area. AeroPoints were left on for ~2 hours to collect GNSS data.
    2. Once connected to Wifi, the AeroPoint data were uploaded and run through a post-processing kinematic algorithm of the CORS network to get a global accuracy. 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 was used to produce orthometric heights. These are exported to a CSV file and named 2023011FA_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, Chris R., Traykovski, Peter A., and Marsjanik, Eric, 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: data release DOI:10.5066/P9GEVWG1, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details:
    This publication is the latest survey data of Head of the Meadow Beach from 2022.
    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 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 survey data of Head of the Meadow Beach from 2021.
    Over, Jin-Si R., Sherwood, Chris R., Traykovski, Peter A., Brosnahan, Sandra M., Marsjanik, Eric E., and Borden, John S., 2021, Topographic and bathymetric data, sediment samples, and beach imagery collected at Head of the Meadow, 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 survey data of Head of the Meadow Beach from 2020.

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

  1. How well have the observations been checked?
    AeroPoints have an internal accuracy (positions relative to other AeroPoints in the same dataset) down to 1 mm, but the general internal horizontal accuracy is 10 mm or better and the vertical accuracy is 20 mm or better. Local accuracy is assessed by taking GPS shots on top of AeroPoints and the GPS is referencing local reference mark HOM RM1. Global accuracy (AeroPoints relative to NAD83[2011] datum) is assessed by using Continuously Operating Reference Stations (CORS) network corrections, the positions and elevations are produced with variance data and the minimum global accuracy of the AeroPoints can be calculated using the distance from the base station: Global Accuracy = Internal Accuracy in mm + (Baseline Distance *2).
  2. How accurate are the geographic locations?
    See attributes for internal xy variance in millimeters. Local accuracy is 2 cm based on RTK positions in relation to the known reference mark. Minimum global horizontal accuracy is 3 cm, average is 1.2 cm.
  3. How accurate are the heights or depths?
    See attributes for internal z variance in millimeters. Local accuracy is 2 cm based on RTK positions in relation to the known reference mark. Minimum global vertical accuracy is 4 cm, average is 2.2 cm.
  4. Where are the gaps in the data? What is missing?
    There are a total of 10 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 as the RTK values are less accurate only the Propeller values are 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 2023-011-FA navigation data: ground control points (AeroPoints) 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. 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? 2023011FA_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?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by 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. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 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.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    The user must have software capable reading CSV format.

Who wrote the metadata?

Dates:
Last modified: 25-Jul-2023
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_P9FYVLCD/2023011FA_Truro_navigation_metadata.faq.html>
Generated by mp version 2.9.51 on Wed Jul 26 11:10:00 2023