U.S. Geological Survey
2021
Bathymetric grid during field activity 2021-022-FA offshore Marconi Beach, Wellfleet MA on March 10, 2021
1.0
raster digital data
data release
DOI:10.5066/P9POZ9VH
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/P9POZ9VH
https://cmgds.marine.usgs.gov/data/field-activity-data/2021-022-FA/
J. Over
C. Sherwood
P. Traykovski
E. Marsjanik
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
1.0
digital files
data release
DOI:10.5066/P9POZ9VH
Reston, VA
U.S. Geological Survey
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.
https://doi.org/10.5066/P9POZ9VH
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.
May be used as an elevation dataset of Marconi Beach for use by the public, researchers, and others to observe ground conditions and change over time of the bathymetry in front of the Marconi Beach Coastcam.
This bathymetric grid represents approximately 0.686 square kilometers of nearshore single beam echo-sounder bathymetry data collected on March 10, 2021 in view of the CoastCam cameras on Marconi Beach. 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.
20210310
ground condition; bathymetry was collected on a single day: March 10, 2021
Not planned
-69.96349142
-69.95193180
41.89894378
41.89236417
USGS Metadata Identifier
USGS:7b672625-e29f-4ff9-8e50-71a1c7f64cc5
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
Wellfleet
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
Woods Hole
MA
02543-1598
508-548-8700 x2269
jover@usgs.gov
2021022FA_Marconi_bathymetry_browse.JPG https://cmgds.marine.usgs.gov/data/field-activity-data/2021-022-FA/data/Topobathy/Bathymetry/2021022FA_Marconi_bathymetry_browse.JPG
Depth-colored image of bathymetry data collected offshore of Marconi Beach, MA
JPEG
The GNSS receiver used on the autonomous survey vehicle (ASV) has theoretical vertical and horizontal accuracies of 5 meters.
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.
Navigation information was acquired from the GNSS reciever in PPK mode with a Multi-band GNSS antenna that has an estimated horizontal accuracy of 5 cm.
The location information was acquired from the GNSS receiver in PPK mode with a Multi-band GNSS antenna and hot shoe adapter with an estimated vertical accuracy of 5 cm.
The bathymetry was collected by launching the ASV 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 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. Duplicate times were removed before the PPK GNSS positions and altitude (ppk_Height) were interpolated to time of Echosounder samples with the MATLAB function interp1 (linear interpolation) and 'pchip'.
4. 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 (17 sec). The GPS measures vertical fluctuation of the boat due to waves and these fluctuations are also visible in echosounder data. The equation in Step 5 removes the vertical fluctuation due to waves from the echosounder data leaving only true bathymetry if GPS and the Echosounder are well synced. The lagged cross correlation processing ensures they are synced optimally.
5. Calculated sea floor elevation (referred to as depth) with reference to the NAVD88 datum in meters by the following equation: Depth = ppk_Height - Antenna_Z_Offset + Echo_altitude; Antenna_Z_Offset = 0.43 m is the offset from the GNSS antenna to the Echosounder transducer on the z-axis of the ASV.
6. Exported interpolated trackline data to CSV file: 2021022FA_Marconi_trackline.csv.
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 with a Monte Carlo optimization procedure for the data regularization. This entails one cross-shore line of data being removed from the processing and the smoothness parameter is adjusted so the overall surface fit best fits the removed data. This is then repeated over all the lines. For the final processing the optimized smoothing parameter is used with all the data.
8. The MATLAB function 'roipoly' returns the mask as a binary image, setting pixels inside the region of interest to 1 and pixels outside the ROI to 0. The boundary is developed so that there is no extrapolated bathymetry data outside the tracklines. The masks extent is the convex hull of the tracklines positions (x,y) and a bounding z coordinate of 0.8 representing the surface in reference to NAVD88 in meters.
9. Export gridded 1 m data in NAD83(2011)/UTM Zone 19N in NAVD88 meters as a GeoTIFF: 2021022FA_Marconi_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.
202103
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
Raster
Pixel
721
952
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
2021022FA_Marconi_bathymetry_1m.tif and 2021022FA_Marconi_Trackline.csv
A 1-m raster dataset (GeoTIFF format) with encoded elevation values offshore and CSV file of the post-processed navigation GNSS trackline data for the echosounder at Marconi Beach, Wellfleet, MA on March 10, 2021.
U.S. Geological Survey, Coastal and Marine Hazards and Resources Program
Value
Elevation orthometric height (m) in UTM Zone 19N, NAVD88 using Geoid 2018. Negative numbers are below the geoid.
U.S. Geological Survey, Woods Hole Coastal and Marine Science Center
-13.216
-0.916
meters
timedate_EST
Time position values were taken in the format dd-mmm-yyyy hh:mm:ss Zulu Time (UTC)
producer-defined
10-Mar-2021 11:11:54
10-Mar-2021 14:05:57
Echo_altitude
The height in meters of the data point generated from the single-beam echo-sounder transponder with reference to NAVD88.
producer-defined
-13.500
1.181
meters
Latitude
Post-processed kinematic (PPK) latitude of GNSS antenna position at the moment of a valid sounding value relative to the NAD83(2011).
USGS
41.89239214
41.89892183
Decimal degrees
Longitude
Post-processed kinematic (PPK) longitude of GNSS antenna position at the moment of a valid sounding value relative to the NAD83(2011).
USGS
-69.96343348
-69.95194932
Decimal degrees
Easting
Post-processed kinematic (PPK) X-coordinates in NAD83(2011)/UTM Zone 19N interpolated from valid echo-sounder altitude samples.
USGS
420080.388
421030.094
meters
Northing
Post-processed kinematic (PPK) Y-coordinates in NAD83(2011)/UTM Zone 19N interpolated from valid echo-sounder altitude samples.
USGS
4638275.486
4638993.354
meters
ppk_Height
Post-processed kinematic (PPK) height (Z-coordinates) GNSS data in reference to NAVD88 in meters of the electric autonomous survey vehicle interpolated from valid echo-sounder samples. A positive z value is the up direction.
USGS
0.709
2.692
meters
Depth
Depth refers to the elevation of the seafloor in NAVD88 in meters and is calculated by subtracting the Antenna_Z_offset (0.43 meters) and adding the Echo-altitude from the ppk_Height (Z-coordinate).
producer-defined
-12.879
0.917
timedate_EST
Time position values were taken in the format dd-mmm-yyyy hh:mm:ss Eastern Standard Time (EST)
producer-defined
2021-03-10 10:05:57
2021-03-10 11:11:54
meters
Only the first attribute applies ot the binary GeoTIFF file, the rest pertain to the CSV. The GeoTIFF has 952 columns and 721 rows, the CSV has 3,892 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 interpolated navigation GNSS data and the raw echosounder data as given in the Entity and Attribute Information section.
USGS Field Activity 2021-022-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 file 2021022FA_Marconi_bathymetry.zip containing a 32-bit floating point GeoTIFF 1m grid of bathymetric data (2021022FA_Marconi_bathymetry_1m.tif) and corrected trackline positions and elevation values (2021022FA_Marconi_trackline.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 file containing 32-bit floating point GeoTIFF representing a grid of single beam bathymetric data collected by Peter Traykovski (WHOI) during field activity 2021-022-FA offshore Marconi Beach, Wellfleet MA in March 2021.
Use WinZip, 7zip, Peazip or pkUnzip
1.46
https://cmgds.marine.usgs.gov/data/field-activity-data/2021-022-FA/data/Topobathy/Bathymetry/2021022FA_Marconi_bathymetry.zip
https://cmgds.marine.usgs.gov/data/field-activity-data/2021-022-FA
https://doi.org/10.5066/P9POZ9VH
The first link in the list above is to directly download the data, the second 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 file contains trackline data.
Use WinZip, 7zip, Peazip or pkUnzip
1.46
https://cmgds.marine.usgs.gov/data/field-activity-data/2021-022-FA/data/Topobathy/Bathymetry/2021022FA_Marconi_bathymetry.zip
https://cmgds.marine.usgs.gov/data/field-activity-data/2021-022-FA
https://doi.org/10.5066/P9POZ9VH
The first link in the list above is to directly download the data, the second 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/.
20211011
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
None
None