Topobathy grid representing the backshore to the nearshore at Head of the Meadow Beach, Truro from data collected on March 10 and 18, 2022

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Frequently anticipated questions:

What does this data set describe?

Title:
Topobathy grid representing the backshore to the nearshore at Head of the Meadow Beach, Truro from data collected on March 10 and 18, 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 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?
    Traykovski, Peter A., and Over, Jin-Si R., 20220919, Topobathy grid representing the backshore to the nearshore at Head of the Meadow Beach, Truro from data collected on March 10 and 18, 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, 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 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:
    Suggested citation: Over, J.R., Sherwood, C.R., 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: -70.08047366
    East_Bounding_Coordinate: -70.06943204
    North_Bounding_Coordinate: 42.05917679
    South_Bounding_Coordinate: 42.04916944
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/62e0031ad34e952be9098102?name=2022015FA_Truro_topobathy_browse.JPG&allowOpen=true (JPEG)
    Elevation-colored image of topobathy data collected onshore and offshore of Head of the Meadow Beach, Truro MA
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 10-Mar-2022
    Currentness_Reference:
    ground condition. Two days of surveying. Topography collected on March 10 and Bathymetry collected on March 18.
  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 1101 x 901, 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 and GEOID 12B
      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_Topobathy_1m_cog.tif
    A 1-m cloud-optimized raster dataset (NAD83[2011]/UTM Zone 19N NAVD88 GeoTIFF) with encoded elevation values from bathymetry and photogrammetrically-derived topography at Head of the Meadow Beach, Truro, MA. (Source: U.S. Geological Survey, Coastal and Marine Hazards and Resources Program)
    Value
    Elevation relative to NAVD88 (m) using Geoid 2012B (Source: producer defined)
    Range of values
    Minimum:-12.400
    Maximum:24.645
    Units:meters
    Entity_and_Attribute_Overview:
    No-data value is -3.402823E38. The file naming convention is as follows: 2022015FA is the USGS field activity name; Truro (Head of the Meadow Beach) is the location; Topobathy is the product; 1m is the resolution; and cog stands for cloud-optimized GeoTIFF.
    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)
    • Peter A. Traykovski
    • 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?

This topobathymetric elevation grid represents the bluffs, dunes, beach, and nearshore of Head of the Meadow Beach in view of the CoastCam.

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: Jul-2022 (process 1 of 2)
    The 25 cm Digital Surface Model (DSM) 2022015FA_Truro_DSM_25cm.tif and 1 m bathymetry grid 2022015FA_Truro_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 were combined with the interpolation method regularizedata3d (bicubic interpolation) using 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. The combined grid was 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 region of interest (ROI) to 0. The boundary was determined by specifying the polygon vertices as the regularizedata3D outputs (x,y,z) from the previous step and prevented extrapolation beyond the tracklines of the bathymetry and DSM extent.
    3. The final merged GeoTIFF was created using the GRIDobj tool in the TopoToolbox (Schwanghart and Scherler, 2014), which used the interpolated grid from Step 1 and the mask from step 2 to create the final output. The GeoTIFF was exported in NAD83(2011)/UTM Zone 19N in NAVD88 meters, using Geoid 12B. Note that using NAVD88 as a height means that the depths are not true-depths but the elevation of the seafloor above or below the geoid.
    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
    Date: 11-Jul-2022 (process 2 of 2)
    The final grid was turned into a cloud-optimized GeoTIFF and compressed using the following gdal (v. 3.1.4, accessed 2021-04-06) command where i is each file in a folder and the result is put into a subfolder named cog: for %i in (.\*.tif) do gdal_translate %i .\cog\%~ni_cog.tif -of COG -stats -co BLOCKSIZE=256 -co COMPRESS=DEFLATE -co PREDICTOR=YES -co NUM_THREADS=ALL_CPUS -co BIGTIFF=YES A second command was run to make sure ’no-data’ values are formatted so GIS systems do not display those values as pixels: for %i in (.\*.tif) do gdal_translate %i .\%~ni_nodata.tif -a_nodata -3.4028234663852886e+38 Person who carried out this activity:
    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
  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., Marsjanik, Eric, and Borden, Jonathan S., 2021, Topographic and bathymetric data, sediment samples, and beach imagery collected at Head of the Meadow, Truro in March 2020: data release DOI:10.5066/P9KSG1RQ, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details:
    This publication is the 2020 field data at Head of the Meadow Beach.
    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?
    No official QC test was performed, but all elevation values are internally consistent in relation to previous surveys (see cross-reference). See the bathymetry and topography datasets and metadata in the larger work citation for more details on the components that make up the topobathy grid.
  2. How accurate are the geographic locations?
    See the bathymetry and topography datasets and metadata in the larger work citation for more details on the components that make up the topobathy grid.
  3. How accurate are the heights or depths?
    See the bathymetry and topography datasets and metadata in the larger work citation for more details on the components that make up the topobathy grid.
  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?
    Grid values match the individual bathymetry and topography datasets in the larger work citation. The resolution of the topography was lowered in the topobathy grid.

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? File 2022015FA_Truro_topobathy_1m_cog.tif contains elevation grid of the beach to nearshore.
  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?
    These data are available as a 64-bit floating point GeoTIFF image. To utilize these data, 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: 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_topobathy_metadata.faq.html>
Generated by mp version 2.9.51 on Tue Sep 20 11:32:52 2022