U.S. Geological Survey
20220131
Bathymetric data during field activity 2021-014-FA offshore Head of the Meadow Beach, Truro MA on February 11, 2021
1.0
raster digital data
data release
DOI:10.5066/P9D94NZ3
Woods Hole Coastal and Marine Science Center, Woods Hole, MA
U.S. Geological Survey, Coastal and Marine Hazards and Resources Program
https://doi.org/10.5066/P9D94NZ3
https://cmgds.marine.usgs.gov/data/field-activity-data/2021-014-FA/
J. Over
C. Sherwood
P. Traykovski
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
1.0
tabular digital data
data release
DOI:10.5066/P9D94NZ3
Reston, VA
U.S. Geological Survey
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
https://doi.org/10.5066/P9D94NZ3
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.
These data may be used as a high-resolution bathymetry dataset of Head of the Meadow Beach by the public, researchers, and others to observe ground conditions and change over time.
This bathymetric grid, as constructed using the raw echosounder and GPS data available in the 2021014FA_Bathyemtry.zip file, represents the nearshore of Head of the Meadow Beach in view of CoastCam CACO-01 cameras on February 11, 2021. The grid has sections of interpolation and has not been cloud optimized. For more information about the WHCMSC Field Activity, see https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-014-FA.
20210211
ground condition; bathymetry was collected on a single day: February 11, 2021
Not planned
-70.07988662
-70.07068035
42.05852660
42.05133652
USGS Metadata Identifier
USGS:9979189e-dda6-48ad-a4b8-6568cb6fb6b0
None
U.S. Geological Survey
USGS
Coastal and Marine Hazards and Resources Program
CMHRP
Woods Hole Coastal and Marine Science Center
WHCMSC
USGS Thesaurus
remote sensing
single-beam echo sounder
bathymetry
ISO 19115 Topic Category
geoscientificInformation
oceans
elevation
Common geographic areas
United States
Truro
Massachusetts
Cape Cod
None
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.
Jin-Si Over
U.S. Geological Survey
mailing and physical address
U.S. Geological Survey 384 Woods Hole Rd
Woods Hole
MA
02543-1598
508-548-8700 x2269
jover@usgs.gov
https://cmgds.marine.usgs.gov/data/field-activity-data/2021-014-FA/data/Topobathy/Bathymetry/2021014FA_Truro_bathymetry_browse.JPG
Height relative to NAVD88-colored image of bathymetry data collected offshore of Head of the Meadow Beach, MA
JPEG
Jin-Si R. Over
Christopher R. Sherwood
Peter A. Traykovski
Sandra M. Brosnahan
Marinna A. Martini
Eric Marsjanik
Jonathan S. Borden
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
Woods Hole Coastal and Marine Science Center, Woods Hole, MA
U.S. Geological Survey, Coastal and Marine Hazards and Resources Program
This publication is the prior years field data at Head of the Meadow Beach.
https://doi.org/10.5066/P9KSG1RQ
The GNSS receiver used on the autonomous survey vehicle (ASV) has theoretical vertical and horizontal accuracies of 5 centimeters.
This file represents single beam echo-sounder bathymetry data collected by Peter Traykovski (WHOI). These data were combined with post-processed kinematic (PPK) orthometric heights collected using a GNSS receiver (EMLID Reach M2) mounted on a self-righting ASV corrected to a base station (JAVA Triumph) onshore in GEOID12B NAVD88 meters. The GNSS antenna is offset from the echo-sounder by 0.43 meters (referred to as Antenna_Z_Offset), and this is taken into account when calculating the depth in the trackline variables(see Processing Steps).
All collected survey line data were edited for erroneous soundings before being incorporated into the final bathymetric grid, the mask prevents extrapolation of data beyond the bounds but does not exclude any data. The raw CSV files of trackline and echosounder values have been edited to remove null returns at the beginning and end of the survey but still contain null values.
Navigation information was acquired from the GNSS receiver in PPK mode with a Multi-band GNSS antenna that has a theoretical horizontal accuracy of 1-5 cm and average reported SD of 1.0 cm.
The location information was acquired from the GNSS receiver in PPK mode with a Multi-band GNSS antenna and hot shoe adapter with a theoretical horizontal accuracy of 1-5 cm and average reported SD of 1.6 cm.
The bathymetry was collected by launching the SSV into the water from the surf zone. The boat was controlled near the shore by Peter Traykovski and put on auto-pilot using predetermined tracklines for longer transects offshore.
The raw bathymetry data was processed with the following steps:
1. Parsed the binary data (BU353s4 GPS Puck, Time, Position and Echosounder range) into MATLAB (v. 2020b) from the EA24 Echosounder using MATLAB Scripts developed by Peter Traykovski at WHOI - see contact below
2. Post Processed Kinematic (PPK) GNSS (Novatel OEM-V2_L1L2) data from the vessel was corrected using the base station (Java Triumph-1) data in Novatel Inertial Explorer (Version 8.70.8722) using the datum NAD83(2011) and then GEOID 12B for the vertical datum NAVD88. A projection for UTM Zone 19N was also specified to get the Easting and Northing information. An antenna height of 0.0 was used and then the actual antenna height is corrected for in Step 5.
3. Refined time alignment to account for any small time delays between GPS data and Echosounder data collection by using time lagged cross correlation of Echosounder range and PPK GNSS altitude in locations with a relatively flat bottom (18 sec). The GPS measures vertical fluctuation of the boat due to waves and these fluctuations were also visible in echosounder data. The equation in Step 5 removed the vertical fluctuation due to waves from the echosounder data that leaves only true bathymetry if GPS and the Echosounder are well synced. The lagged cross correlation process ensures that they were synced optimally.
4. Duplicate times were removed from the PPK GNSS positions to create 2021014FA_Truro_trackline_raw.csv, then GPS values (ppk_Height) were interpolated to time of Echosounder samples (2021014FA_Truro_echo_raw.csv) with the MATLAB function interp1 (linear interpolation) and 'pchip'.
5. Calculated sea floor elevation (referred to as depth) with reference to the NAVD88 datum in meters using the following equation: Depth = ppk_Height - Antenna_Z_Offset + Echo 450kHz; Antenna_Z_Offset = 0.43 m was the offset from the GNSS antenna to the Echosounder transducer on the z-axis of the ASV.
7. Gridded 'Depth' onto 1 m resolution UTM eastings, northings using MATLAB file exchange script regularizedata3d by Jamal (2020), a cubic interpolation with the optimum smoothness coefficient determined by a Monte Carlo optimization procedure for the data regularization. Regularizedata3d entailed removing one cross-shore line of data from the processing and adjusting the smoothness parameter so the overall surface fit best fits the removed data. The process was then repeated for all the lines of data. The optimized smoothing parameter was used with all the data for the final processing.
8. The MATLAB function 'roipoly' returned the mask as a binary image, which sets pixels inside the region of interest (ROI) to 1 and pixels outside the ROI to 0. The boundary was developed so that there were no extrapolated bathymetry data outside the tracklines. The masks extent was the convex hull of the tracklines positions (x,y) and a bounding z coordinate of 0.8 represented the surface in reference to NAVD88 in meters.
9. Exported gridded 1 m data in NAD83(2011)/UTM Zone 19N in NAVD88 meters as a GeoTIFF: 2021014FA_Truro_bathymetry_1m.tif. 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.
Jamal (2020). RegularizeData3D (https://www.mathworks.com/matlabcentral/fileexchange/46223-regularizedata3d), MATLAB Central File Exchange. Retrieved September 23, 2020.
202102
Peter Traykovski
Woods Hole Oceanographic Institution
Associate Scientist
mailing and physical address
226 Woods Hole Rd, MS #12
Woods Hole
MA
02543-1598
508-289-2638
ptraykovski@whoi.edu
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.
20220411
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
USA
(508) 548-8700 x2251
(508) 457-2310
vatnipp@usgs.gov
Raster
Universal Transverse Mercator
19
0.999600
-69.000000
0.000000
500000.000000
0.000000
row and column
1
1
meters
North American Datum of 1983 (National Spatial Reference System 2011)
GRS_1980
6378137.000000
298.257222101
North American Vertical Datum of 1988
0.001
meters
Explicit elevation coordinate included with horizontal coordinates
2021014FA_Truro_bathymetry_1m.tif
A 1-m raster dataset (GeoTIFF format) with encoded elevation values offshore at Head of the Meadow Beach, Truro, MA on February 11, 2021. Pixel row and column count are 952 and 721, respectively.
U.S. Geological Survey, Coastal and Marine Hazards and Resources Program
Value
Surface elevation orthometric height NAVD88 (m) using Geoid 2012B in NAD83(2011) UTM Zone 19N
U.S. Geological Survey, Woods Hole Coastal and Marine Science Center
-11.09
0.622
meters
2021014FA_Truro_trackline_raw.csv
A CSV file of the raw navigation GPS trackline data for the ASV at Head of the Meadow Beach, Truro, MA on February 11, 2021.
U.S. Geological Survey, Coastal and Marine Hazards and Resources Program
INFO
USGS Field Activity number
U.S. Geological Survey, Woods Hole Coastal and Marine Science Center
2021-014-FA
Year, ID, and Field Activity abbreviation
USGS
Date
Time at which values were taken in the format dd-mmm-yyyy
U.S. Geological Survey, Woods Hole Coastal and Marine Science Center
2021-02-11
2021-02-11
GPS_Time_UTC
Time of GPS data in UTC, corrected with 18 sec delay in HH:MM:SS
U.S. Geological Survey, Woods Hole Coastal and Marine Science Center
14:59:18
16:31:37
meters
Latitude
Post-processed kinematic (PPK) latitude of GNSS antenna position relative to the NAD83(2011).
USGS
42.05138646
42.05847962
Decimal degrees
Longitude
Post-processed kinematic (PPK) longitude of GNSS antenna position relative to the NAD83(2011).
USGS
-70.07978519
-70.07078047
Decimal degrees
H_Ell_m
Post-processed kinematic (PPK) height in meters relative to the NAD83(2011) ellipsoid
producer-defined
-26.433
-23.53
meters
Easting
Post-processed kinematic (PPK) X-coordinates in NAD83(2011)/UTM Zone 19N.
USGS
410648.715
411398.961
meters
Northing
Post-processed kinematic (PPK) Y-coordinates in NAD83(2011)/UTM Zone 19N.
USGS
4656041.051
4656828.271
meters
ppk_Height_m
Post-processed kinematic (PPK) height of GNSS antenna data in reference to NAVD88 in meters.
USGS
1.149
4.054
meters
2021014FA_Truro_echo_raw.csv
A CSV file of the raw dual frequency echosounder data for the ASV at Head of the Meadow Beach, Truro, MA on February 11, 2021.
U.S. Geological Survey, Coastal and Marine Hazards and Resources Program
INFO
USGS Field Activity number
U.S. Geological Survey, Woods Hole Coastal and Marine Science Center
2021-014-FA
Year, ID, and Field Activity abbreviation
USGS
Date
Time at which values were taken in the format dd-mmm-yyyy
U.S. Geological Survey, Woods Hole Coastal and Marine Science Center
2021-02-11
2021-02-11
EchoTime_UTC
Time of Echosounder data in UTC, in HH:MM:SS
U.S. Geological Survey, Woods Hole Coastal and Marine Science Center
15:05:11
15:50:58
depth200_m
Depth value of echosounder 200kHz frequency in meters relative to NAVD88 in meters.
producer-defined
-6.948
1.028
meters
NaN
Null value
USGS
depth450_m
Depth value of echosounder 450kHz frequency in meters relative to NAVD88 in meters.
producer-defined
-11.528
1.372
meters
NaN
Null value
USGS
The GeoTIFF has 952 columns and 721 rows, the 2021014FA_Truro_trackline_raw.csv has 6,245 records, and the 2021014FA_Truro_echo_raw.csv has 13,734 records. The GeoTIFF is in 32-bit floating point format that represent elevation in meters relative to the NAVD88 datum. The trackline CSV contains post-processed navigation GNSS data and the echosounder CSV contains the raw echosounder data as given in the Entity and Attribute Information section.
USGS Field Activity 2021-014-FA
Jin-Si Over
U.S. Geological Survey
Geographer
mailing and physical
U.S. Geological Survey
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
508-548-8700 x2269
jover@usgs.gov
Windows 10 zip folder 2021014FA_Truro_Bathymetry.zip containing a 32-bit floating point GeoTIFF 1m grid of bathymetric data (2021014FA_Truro_bathymetry_1m.tif), trackline positions (2021014FA_Truro_trackline_raw.csv), and echosounder values (2021014FA_Truro_echo_raw.csv).
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.
GeoTIFF
1.0.0
32-bit floating point GeoTIFF format
Windows 10 zip folder containis a 32-bit floating point GeoTIFF representing a grid of single beam bathymetric data collected by Peter Traykovski (WHOI) during field activity 2021-014-FA offshore of Head of the Meadow Beach, Truro MA on February 11, 2021.
Use WinZip, 7zip, Peazip or pkUnzip
3.69
https://cmgds.marine.usgs.gov/data/field-activity-data/2021-014-FA/data/Topobathy/Bathymetry/2021014FA_Truro_Bathymetry.zip
https://cmgds.marine.usgs.gov/data/field-activity-data/2021-014-FA
https://doi.org/10.5066/P9D94NZ3
The first link in the list above is to directly download the data in the zip file. The transfer size refers to the uncompressed GeoTIFF. The total size of the zip file is 2.05 MB. The second link is to the field data page, and the third link is to the publication landing page.
CSV
Exported from Excel Office 365 16.01
The CSV files contains trackline and echosounder data.
Use WinZip, 7zip, Peazip or pkUnzip
1
https://cmgds.marine.usgs.gov/data/field-activity-data/2021-014-FA/data/Topobathy/Bathymetry/2021014FA_Truro_Bathymetry.zip
https://cmgds.marine.usgs.gov/data/field-activity-data/2021-014-FA
https://doi.org/10.5066/P9D94NZ3
The first link in the list above is to directly download the data in the zip file. The transfer size refers to the uncompressed CSV files. The total size of the zip file is 2.05 MB. The second link is to the field data page, and the third link is to the publication landing page.
None.
These data are available as a 32-bit floating point GeoTIFF image. To utilize these data, the user must have an image viewer, image processing, 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/.
20220411
Jin-Si Over
U.S. Geological Survey
Geographer
mailing and physical
U.S. Geological Survey
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
508-548-8700 x2269
jover@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998