Ground control points used at Marconi Beach, Wellfleet on March 11, 2022

Frequently anticipated questions:

• What does this data set describe?
  1. How might this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  3. What similar or related data should the user be aware of?
• How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How might this data set be cited?
   Over, Jin-Si R., 20221006, Ground control points used at Marconi Beach, Wellfleet on March 11, 2022: data release DOI:10.5066/P9L1KCQB, U.S. Geological Survey, Coastal and Marine Hazards and Resources Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

   Online Links:

   • https://doi.org/10.5066/P9L1KCQB
   • https://www.sciencebase.gov/catalog/item/62deecd5d34e952be909419a

   This is part of the following larger work.
   Over, Jin-Si R., Sherwood, Chris R., Traykovski, Peter A., and Bartlett, Marie K., 2022, Topographic and bathymetric data, structure from motion imagery, and ground control data collected at Marconi Beach, Wellfleet, MA in March 2022, U.S Geological Survey Field Activity 2022-014-FA: data release DOI:10.5066/P9L1KCQB, U.S. Geological Survey, Reston, VA.

   Online Links:

   • https://doi.org/10.5066/P9L1KCQB
   • https://www.sciencebase.gov/catalog/item/62dee032d34e952be9094176

   Other_Citation_Details:

   Suggested citation: Over, J.R., Sherwood, C.R., Traykovski, P.A., and Bartlett, M.K., 2022, Topographic and bathymetric data, structure from motion imagery, and ground control data collected at Marconi Beach, Wellfleet in March 2022, U.S Geological Survey Field Activity 2022-014-FA: U.S Geological Survey data release, https://doi.org/10.5066/P9L1KCQB.

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -69.96377120
   East_Bounding_Coordinate: -69.96208591
   North_Bounding_Coordinate: 41.89524567
   South_Bounding_Coordinate: 41.89112789
   

3. What does it look like?

   https://www.sciencebase.gov/catalog/file/get/62deecd5d34e952be909419a?name=2022014FA_Marconi_nav_browse.JPG&allowOpen=true (JPEG)

   Browse graphic of the spatial distribution of the ground control points at Marconi Beach, MA.

4. Does the data set describe conditions during a particular time period?

   Calendar_Date: 11-Mar-2022

   Currentness_Reference:

   ground condition; ground control point data was collected on March 11, 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?

   2022014FA_Marconi_nav_GCPs.csv

   Ground control point positions and attributes. (Source: U.S. Geological Survey)

   INFO

   USGS Field Activity Number (Source: USGS)

   Value	Definition
   2022-014-FA	USGS year, ID, and Field Activity

   Point_ID

   Unique point identification number, consecutive. (Source: USGS)

   Range of values
   Minimum:	1
   Maximum:	20

   GPS

   Type of GPS processing; Propeller is PPK processing for the AeroPoints and RTK is data from the SP80 base and rover (Source: USGS) 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 tarps and the number taped onto it. (Source: USGS) Character string.

   Northing

   Feature location Y-Coordinate (NAD83(2011)/UTM Zone 19N) (Source: USGS)

   Range of values
   Minimum:	4638136.130
   Maximum:	4638594.104
   Units:	meters

   Easting

   Feature location X-Coordinate (NAD83(2011)/UTM Zone 19N) (Source: USGS)

   Range of values
   Minimum:	420051.456
   Maximum:	420186.295
   Units:	meters

   Orthometric_height_NAVD88

   Feature orthometric Z-Coordinate (NAVD88) using GEOID 18 (Source: USGS)

   Range of values
   Minimum:	0.539
   Maximum:	17.663
   Units:	meters

   Latitude

   Feature location latitude (NAD83(2011)) (Source: USGS)

   Range of values
   Minimum:	41.89112789
   Maximum:	41.89524567
   Units:	decimal degrees

   Longitude

   Feature location longitude (NAD83(2011)) (Source: USGS)

   Range of values
   Minimum:	-69.96377120
   Maximum:	-69.96208591
   Units:	decimal degrees

   Ellipsoid_height_NAD83(2011)

   Feature height above the (NAD83(2011) GRS80) ellipsoid (Source: USGS)

   Range of values
   Minimum:	-27.258
   Maximum:	-10.137
   Units:	meters

   Date

   Feature date in format YYYYMMDD where YYYY is the year, MM in the month, and DD is the day. (Source: USGS) Character string

   Time_EST

   Final position collection time in Eastern Standard Time (EST) (Source: USGS)

   Range of values
   Minimum:	11:07:49
   Maximum:	12:38:00
   Units:	HH:MM:SS EST

   Xvar_mm

   Variance in the x-coordinate from post-processing (Source: USGS)

   Value	Definition
   NA	Null value

   Range of values
   Minimum:	1.6
   Maximum:	23.7
   Units:	millimeters

   Yvar_mm

   Variance in the y-coordinate from post-processing (Source: USGS)

   Value	Definition
   NA	Null value

   Range of values
   Minimum:	1.4
   Maximum:	18.3
   Units:	millimeters

   Zvar_mm

   Variance in the z-coordinate from post-processing (Source: USGS)

   Value	Definition
   NA	Null value

   Range of values
   Minimum:	5.3
   Maximum:	22.9
   Units:	millimeters

   Entity_and_Attribute_Overview:

   These attribute definitions describe each column of information in the CSV file 2022014FA_Marconi_nav_GCPs.csv. No data values are represented by NA.

   Entity_and_Attribute_Detail_Citation: USGS Field Activity 2022-014-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?

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: 11-Mar-2022 (process 1 of 1)

   The ground control points were processed with the following steps:
   1. Ten AeroPoints and ten 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 UTM Zone 19N 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 2022014FA_Marconi_nav_GCPs.csv. Person who carried out this activity:
   

   Jin-Si R. Over

   U.S Geological Survey

   Geographer

   384 Woods Hole Rd

   Woods Hole, MA
   

   508-458-8700 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, sediment samples, structure from motion imagery, and reference mark data collected at Marconi Beach, Wellfleet in winter 2021, U.S Geological Survey Field Activity 2021-022-FA: data release DOI:10.5066/P9POZ9VH, U.S. Geological Survey, Reston, VA.

   Online Links:

   • https://doi.org/10.5066/P9POZ9VH

   Other_Citation_Details:

   This publication is the original/first survey data of Marconi Beach from 2021.

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 QC/QA’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 are a total of 20 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. 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 2022-014-FA navigation data: ground control points (AeroPoints) and plastic tarps deployed on March 11 for use in tandem with the aerial imagery.

How can someone get a copy of the data set?

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? 2022014FA_Marconi_nav_GCPs.csv contains ground control point position data.
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?
   • Availability in digital form:

     Data format:	ground control point data in format CSV (version Exported from Excel Office 365 16.01) Size: 0.02
     Network links:	https://www.sciencebase.gov/catalog/file/get/62deecd5d34e952be909419a https://www.sciencebase.gov/catalog/item/62deecd5d34e952be909419a https://doi.org/10.5066/P9L1KCQB

   • Cost to order the data: None.

5. What hardware or software do I need in order to use the data set?
   None.

Who wrote the metadata?

Dates:

Last modified: 06-Oct-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)