Ground control points at Head of the Meadow, Truro during field activity 2021-014-FA on February 4, 2021

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Frequently anticipated questions:

What does this data set describe?

Title:
Ground control points at Head of the Meadow, Truro during field activity 2021-014-FA on February 4, 2021
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 2021-014-FA and a collaboration with the National Park Service at Cape Cod National Seashore to monitor the region. In February 2021, 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 (Ricoh GRII) and a post-processed kinematic (PPK) system attached to a helium powered balloon-kite (Helikite). High-precision GPS targets (AeroPoints) 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 Small Surf Vehicle (SSV). Agisoft Metashape (v. 1.7.2) was used to create a digital elevation model with the collected imagery and this was merged with the bathymetry in MATLAB (v. 2020) 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=2021-014-FA.
  1. How might this data set be cited?
    U.S. Geological Survey, 20220131, Ground control points at Head of the Meadow, Truro during field activity 2021-014-FA on February 4, 2021: data release DOI:10.5066/P9D94NZ3, 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, J., Sherwood, C., and Traykovski, P., 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:
    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, Truro in February 2021, U.S. Geological Survey Field Activity 2021-014-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P9D94NZ3
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -70.07880823
    East_Bounding_Coordinate: -70.07634314
    North_Bounding_Coordinate: 42.05265307
    South_Bounding_Coordinate: 42.05096948
  3. What does it look like?
    https://cmgds.marine.usgs.gov/data/field-activity-data/2021-014-FA/data/Navigation/2021014FA_Truro_nav_browse.JPG (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: 04-Feb-2021
    Currentness_Reference:
    ground condition; single survey day: ground control points were collected on February 4, 2021.
  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 0.01
      Ordinates (y-coordinates) are specified to the nearest 0.01
      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
      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?
    2021014FA_Truro_nav_AeroPoints.csv
    Ground control point (AeroPoints) positions, elevations, and attributes (Source: U.S. Geological Survey)
    INFO
    USGS Field Activity Number (Source: USGS)
    ValueDefinition
    2021-014-FAUSGS year, ID, and Field Activity
    Point_ID
    Unique point identification number. (Source: USGS)
    Range of values
    Minimum:1
    Maximum:10
    Attributes
    Unique identifier for AeroPoint. (Source: USGS)
    ValueDefinition
    ac########Refers to AeroPoint Global IDs, ac followed by a string of eight numbers and letters.
    Northing
    Feature location Y-Coordinate (NAD83(2011)/UTM Zone 19N) (Source: USGS)
    Range of values
    Minimum:4655995.728
    Maximum:4656184.890
    Units:meters
    Easting
    Feature location X-Coordinate (NAD83(2011)/UTM Zone 19N) (Source: USGS)
    Range of values
    Minimum:410728.159
    Maximum:410930.444
    Units:meters
    H_Ortho_m
    Feature orthometric Z-Coordinate (NAVD88) using GEOID 18 (Source: USGS)
    Range of values
    Minimum:0.831
    Maximum:4.020
    Units:meters
    Latitude
    Feature location latitude (NAD83(2011)) (Source: USGS)
    Range of values
    Minimum:42.05096948
    Maximum:42.05265307
    Units:decimal degrees
    Longitude
    Feature location latitude (NAD83(2011)) (Source: USGS)
    Range of values
    Minimum:-70.07880823
    Maximum:-70.07634314
    Units:decimal degrees
    H_Ell_m
    Feature height above the (NAD83(2011) GRS80) ellipsoid (Source: USGS)
    Range of values
    Minimum:-26.752
    Maximum:-23.566
    Units:meters
    Date
    Feature date (Source: USGS)
    Range of values
    Minimum:20210204
    Maximum:20210204
    Units:YYYYMMDD
    Time_EST
    Deployment initiation in Eastern Standard Time (EST) (Source: USGS)
    Range of values
    Minimum:10:03:00
    Maximum:10:20:00
    Units:HH:MM:SS EST
    Xvar_mm
    Variance in the x-coordinate from post-processing (Source: USGS)
    Range of values
    Minimum:0.0003
    Maximum:0.0023
    Units:meters
    Yvar_mm
    Variance in the y-coordinate from post-processing (Source: USGS)
    Range of values
    Minimum:0.0002
    Maximum:0.0022
    Units:meters
    Zvar_mm
    Variance in the z-coordinate from post-processing (Source: USGS)
    Range of values
    Minimum:0.0007
    Maximum:0.0041
    Units:meters
    Entity_and_Attribute_Overview:
    These attribute definitions describe each column of information in the CSV file.
    Entity_and_Attribute_Detail_Citation: USGS Field Activity 2021-014-FA

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?
    Jin-Si Over
    U.S. Geological Survey
    U.S. Geological Survey 384 Woods Hole Rd.
    Woods Hole, MA

    508-548-8700 x2269 (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: 05-Feb-2021 (process 1 of 2)
    The ground control points (AeroPoints) were processed with the following steps:
    1. Ten AeroPoints were deployed evenly spaced across the survey area and 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. The data were exported with X,Y, and Z variances in the horizontal datum NAD83(2011) to produce latitude, longitude, and ellipsoid heights, and then GEOID 18 was used to produce orthometric heights. These are exported to a CSV file named 2021014FA_Truro_nav_AeroPoints.csv. See completeness report for more details. Person who carried out this activity:
    Jin-Si Over
    U.S. Geological Survey
    Geographer
    U.S. Geological Survey
    Woods Hole, MA

    508-548-8700 x2269 (voice)
    jover@usgs.gov
    Date: 11-Apr-2022 (process 2 of 2)
    Update the publication date to 'go live' date. Modified browse graphic name to be the URL to the browse graphic. This work done on 20220307. Added PID to metadata (20220411). Any edits to the metadata also include an update to the metadata date. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    (508) 548-8700 x2251 (voice)
    (508) 457-2310 (FAX)
    vatnipp@usgs.gov
  3. What similar or related data should the user be aware of?
    Over, Jin-Si R., Sherwood, Chris 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: U.S. Geological Survey, Coastal and Marine Hazards and Resources Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    Other_Citation_Details:
    This publication is the original/first 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?
    Positions and elevations are produced by the Propeller Corrections Network (https://www.propelleraero.com/aeropoints-coverage-map/).
  2. How accurate are the geographic locations?
    AeroPoint targets have theoretical 1 cm horizontal absolute accuracy.
  3. How accurate are the heights or depths?
    AeroPoint targets have theoretical 1 cm vertical absolute accuracy.
  4. Where are the gaps in the data? What is missing?
    There are a total of 10 usable ground control points. 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 2021-014-FA navigation data: ground control points (AeroPoints) deployed on February 4 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
    Attn: Jin-Si Over
    Geographer
    384 Woods Hole Road
    Woods Hole, MA

    508-458-8700 x2269 (voice)
    jover@usgs.gov
  2. What's the catalog number I need to order this data set? 2021014FA_Truro_nav_AeroPoints.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?
    The user must have software capable reading CSV format.

Who wrote the metadata?

Dates:
Last modified: 18-Mar-2024
Metadata author:
Jin-Si Over
U.S. Geological Survey
Geographer
U.S. Geological Survey
Woods Hole, MA

508-548-8700 x2269 (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. (updated on 20240318)
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/field_activities/2021_014_fa/2021-014-FA_Truro_navigation_meta.faq.html>
Generated by mp version 2.9.51 on Wed Apr 24 13:53:38 2024