Topobathy grid representing the backshore to the nearshore environment at Marconi Beach, Wellfleet from data taken during field activity 2021-022-FA on March 10 and 17, 2021

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Frequently anticipated questions:

What does this data set describe?

Title:
Topobathy grid representing the backshore to the nearshore environment at Marconi Beach, Wellfleet from data taken during field activity 2021-022-FA on March 10 and 17, 2021
Abstract:
The data in this publication map the beach and nearshore environment at Marconi Beach in Wellfleet, MA and provide regional context for the 2021 CoastCam installation that looks out at the coast shared by beachgoers, shorebirds, seals, and sharks. These data were collected as part of field activity 2021-022-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-02, which are two video cameras aimed at the beach. Starting in February and ending in March 2021, U.S Geological Survey and Woods Hole Oceanographic Institute (WHOI) scientists conducted field surveys to collect position and orientation information for the CoastCam cameras and map the field of view. Two new reference marks were established in the Marconi Beach parking area to establish ground control for future surveys. Elevation data were collected using a real time kinematic – satellite navigation system (RTK-GNSS) receiver attached to a pole and walked on the beach. Point data of the beach face were collected along transects. Grain-size analysis was performed on sediment samples collected with a spade along multiple profiles from the bluff base to the intertidal zone. 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) and 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 survey vehicle. 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:
This topobathymetric grid represents approximately 0.962 square kilometers. The GeoTIFF is not cloud optimized. For more information about the WHCMSC Field Activity, see https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-022-FA.
  1. How might this data set be cited?
    U.S. Geological Survey, 2021, Topobathy grid representing the backshore to the nearshore environment at Marconi Beach, Wellfleet from data taken during field activity 2021-022-FA on March 10 and 17, 2021: data release DOI:10.5066/P9POZ9VH, 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., Traykovski, P., and Marsjanik, E., 2021, 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:

    Other_Citation_Details:
    Over, J.R., Sherwood, C.R., Traykovski, P., and Marsjanik, E., 2021, 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: U.S Geological Survey data release, https://doi.org/10.5066/P9POZ9VH
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -69.96565314
    East_Bounding_Coordinate: -69.95108144
    North_Bounding_Coordinate: 41.89900178
    South_Bounding_Coordinate: 41.89167661
  3. What does it look like?
    2021022FA_Marconi_topobathy_browse.JPG https://cmgds.marine.usgs.gov/data/field-activity-data/2021-022-FA/data/Topobathy/Topobathy/2021022FA_Marconi_topobathy_browse.JPG (JPEG)
    Elevation-colored image of topobathy data collected onshore and offshore of Marconi Beach, Wellfleet MA
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 10-Mar-2021
    Currentness_Reference:
    ground condition. Two days of surveying. Bathymetry collected on March 10 and topography collected on March 17.
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: raster digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Raster data set. It contains the following raster data types:
      • Dimensions 801 x 1201, type Pixel
    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 1
      Ordinates (y-coordinates) are specified to the nearest 1
      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_80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      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?
    2021022FA_Marconi_topobathy_1m.tif
    A raster dataset (GeoTIFF format) with encoded elevation values of Marconi Beach in Wellfleet, MA in March 2021. Pixel resolution is 1-m. (Source: U.S. Geological Survey, Coastal and Marine Hazards and Resources Program)
    Value
    Surface elevation orthometric height (m) in UTM Zone 19N, NAVD88 using Geoid 2018 (Source: U.S. Geological Survey, Woods Hole Coastal and Marine Science Center)
    Range of values
    Minimum:-13.204
    Maximum:21.541
    Units:meters
    Entity_and_Attribute_Overview:
    There are no text attributes associated with a binary GeoTIFF image. GeoTIFF pixels represent elevation in meters in reference to NAVD88.
    Entity_and_Attribute_Detail_Citation: USGS Field Activity 2021-022-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
    Woods Hole, MA

    508-548-8700 x2269 (voice)
    jover@usgs.gov

Why was the data set created?

May be used as an elevation dataset for use by the public, researchers, and others to observe ground conditions and change over time of the bluffs, dunes, beach, and nearshore of Marconi Beach in view of the CoastCam setup.

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: Mar-2021 (process 1 of 1)
    The 25 cm Digital Surface Model (DSM) 2021022FA_Marconi_topography_25cm.tif and the 1 m bathymetry grid 2021022FA_Marconi_bathymetry_1m.tif (available from the larger work citation) were merged and interpolated over a 1 m grid in MATLAB v. 2020b with the following steps. 1. The data (x,y,z) from the DSM and Bathy grids are combined with the interpolation method regularizedata3d (bicubic interpolation) with a smoothness coefficient of 0.001 (used for data with low noise where the input points nearly coincide with the output surface) by Jamal (2020). 2. Combined grid is then masked using 'roipoly' which returns the mask as a binary image, setting pixels inside the region of interest polygon to 1 and pixels outside the ROI to 0. The boundary is determined by specifying the polygon vertices as the regularizedata3D outputs (x,y,z) from the previous step and prevents extrapolation beyond the tracklines of the Bathy and DSM extent. 3. The final merged GeoTIFF is created using the GRIDobj tool in the TopoToolbox (Schwanghart and Scherler, 2014) which uses the interpolated grid from Step 1 and the mask from step 2 to create the final output. The GeoTIFF is output in NAD83(2011)/UTM Zone 19N horizontal coordinate system in the vertical datum NAVD88 with elevations and depths in meters. Schwanghart, W., Scherler, D. (2014): TopoToolbox 2 ‚ MATLAB-based software for topographic analysis and modeling in Earth surface sciences. Earth Surface Dynamics, 2, 1-7. [DOI: 10.5194/esurf-2-1-2014] Jamal (2020). RegularizeData3D (https://www.mathworks.com/matlabcentral/fileexchange/46223-regularizedata3d), MATLAB Central File Exchange. Retrieved September 23, 2020. Person who carried out this activity:
    Peter Traykovski
    Woods Hole Oceanographic Institution
    Associate Scientist
    226 Woods Hole Rd, MS #12
    Woods Hole, MA

    508-289-2638 (voice)
    ptraykovski@whoi.edu
  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?
    The GNSS used on the ASV and to collect the imagery used to model the topography has theoretical vertical and horizontal accuracies of 2-5 cm. See the bathymetry and imagery datasets and metadata in the larger work citation for more details.
  2. How accurate are the geographic locations?
    Navigation information was acquired from a GNSS receiver (EMLID Reach M2) in PPK mode with a Multi-band GNSS antenna that has an estimated horizontal accuracy of 2-5 cm See larger citation imagery, DSM, and bathymetry metadata for more information.
  3. How accurate are the heights or depths?
    The location information was acquired from a GNSS receiver (EMLID Reach M2) in PPK mode with a Multi-band GNSS antenna and hot shoe adapter with an estimated vertical accuracy of 2-5 m. See larger citation imagery, DSM, and bathymetry metadata for more information.
  4. Where are the gaps in the data? What is missing?
    This product represents the full extent of the topography and bathymetry available in the larger work citation. 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?
    This file represents the merged and interpolated 1-meter/pixel resolution single beam echo-sounder bathymetry data and digital surface model created from imagery collected by Peter Traykovski of WHOI. These data are post-processed kinematic (PPK) orthometric heights collected using a GNSS receiver (EMLID Reach M2) corrected to a base station (JAVA Triumph) onshore in GEOID 18 NAVD88.

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)
    Jin-Si Over
    U.S. Geological Survey
    geographer
    U.S. Geological Survey
    Woods Hole, MA

    508-548-8700 x2269 (voice)
    jover@usgs.gov
  2. What's the catalog number I need to order this data set? File 2021022FA_Marconi_topobathy_1m.tif containing a 32-bit floating point GeoTIFF grid.
  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?
    To utilize file, the user must have an image viewer, image processing, or GIS software package capable of importing a GeoTIFF image. Free spatial data viewers or proprietary software such as ArcGIS Earth or Google Earth Pro are capable of displaying the data. See: http://www.esri.com/software/arcgis-earth, or https://www.google.com/earth/desktop/.

Who wrote the metadata?

Dates:
Last modified: 14-Oct-2021
Metadata author:
Jin-Si Over
U.S. Geological Survey
geographer
U.S. Geological Survey
Woods Hole, MA

508-548-8700 x2269 (voice)
jover@usgs.gov
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_022_fa/2021022FA_Marconi_topobathy.faq.html>
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