U.S. Geological Survey
20220131
Orthomosaic representing Head of the Meadow Beach, Truro from images collected during field activity 2021-014-FA on February 4, 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.
Product can be used for visual inspection of beach features.
For more information about the WHCMSC Field Activity, see https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-014-FA.
20210204
ground condition; single survey day: ground control points were collected on February 4, 2021.
Not planned
-70.08075650
-70.07445348
42.05300655
42.04960704
USGS Metadata Identifier
USGS:b2b9c4e8-3f98-401d-90ad-b0ac8f81e9cb
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
structure from motion
datasets
aerial photography
coastal processes
geomorphology
ISO 19115 Topic Category
geoscientificInformation
imagerybaseMapsEarthCover
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/Imagery/2021014FA_Truro_ortho_browse.JPG
True-Color RBG image of Head of the Meadow Beach, Truro MA
JPEG
Jin-Si R. Over
Chris R. Sherwood
Peter A. Traykovski
Sandra M. Brosnahan
Marinna A. Martini
Eric Marsjanik
2021
Topographic and bathymetric data, sediment samples, and imagery collected at Head of the Meadow Beach, Truro in March 2020, U.S. Geological Survey Field Activity 2020-015-FA
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 original/first survey data of Head of the Meadow beach from 2020.
https://doi.org/10.5066/P9KSG1RQ
Jin-Si R. Over
Andrew C. Ritchie
Christine Kranenburg
Jennifer (Jenna) A. Brown
Daniel D. Buscombe
Tom Noble
Christopher R. Sherwood
Jonathan Warrick
Phillipe Wernette
2021
Processing coastal imagery with Agisoft Metashape Professional Edition, version 1.6—Structure from motion workflow documentation
Open-File Report
2021-1039
Reston, VA
U.S. Geological Survey
This publication includes the general methodology for processing imagery in Metashape to produce digital elevation models and ortho products.
https://doi.org/10.3133/ofr20211039
The positional information used on the Helikite and ground control point datasets and metadata are available in the imagery and navigational components of the larger work citation. No color corrections were applied.
There is one orthomosaic of Head of the Meadow Beach created from imagery in the larger work citation.
The structure from motion process that builds the interpolated digital surface model (DSM) and orthomosaic uses all the available imagery and location information but gaps in the data may appear blurry due to interpolation. Users are advised to read the rest of the metadata record carefully for additional details.
Navigation information was acquired from a GNSS receiver (EMLID Reach M2) in PPK mode with a Multi-band GNSS antenna that has a theoretical horizontal accuracy of 2-5 cm. However, using these values in Metashape returned a poor product so the accuracy was loosened to 1 m to rely more on the ground control points, which have a theoretical accuracy of 1-2 cm. The final product was compared to the previous survey at Head of the Meadow (see first cross-reference) and the XY difference at a stable point was within 10 cm.
The orthomosaic was created in Agisoft Metashape v. 1.7.2 using the following general steps (see Over and others, 2021 for a more detailed methodology explanation):
1. The project was created and imagery (located in larger work citation 2021014FA_Truro_f1.zip) and positions (located in larger work citation 2021014FA_Truro_f1_photolocations.csv) were imported using the NAD83(2011) datum.
2. Accuracies for the ground control points (GCPs) were set 0.05 m and accuracies for the camera positions were set to 1 m. The photos were aligned with high accuracy (the pixels are not subsampled for increased processing speed) using a keypoint limit of 50,000 and unlimited tie points.
3. Ten GCPs (2021014FA_Truro_nav_AeroPoints.csv located in the larger work citation) were added to the project in NAD83(2011) and manually placed on the images as markers.
4. The alignment process matches pixels between images to create point clouds and puts the imagery into a relative spatial context using the photo positions and GCPs. Then, Metashape software refined and optimized, using least squares, the camera positions and lens model using gradual selection and optimization parameters of: Ru = 15, Pa = 5, and Re = 0.5 to minimize the reprojection error or the distance between the measured points and the software created points.
5. A dense point cloud was generated using the high quality setting (images were not subsampled) and a low frequency filtering algorithm. The total camera position error was 5 m (XYZ: 2.16, 4.25, 0.99) and the total GCP error was 0.019 m (XYZ: 0.010, 0.010, 0.012). The dense point cloud was then edited to remove noise by filtering by point confidence before generating an interpolated digital elevation model (the software calls all models elevation models, but technically it is a surface model because it includes vegetation/canopy returns, a terrain model would be only bare earth returns).
6. The digital surface model was used to build an orthomosaic, which was then exported from the software at a resolution of 10 cm and in NAD83(2011)/UTM Zone 19N (ESPG:6348) and GEOID 18B NAVD88 in meters.
20210625
Jin-Si Over
U.S. Geological Survey
Geographer
mailing and physical address
384 Woods Hole Rd
Woods Hole
MA
02543-1598
508-548-8700 x2269
jover@usgs.gov
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
Pixel
3710
5170
Universal Transverse Mercator
19
0.999600
-69.000000
0.000000
500000.000000
0.000000
row and column
0.01
0.01
meters
North American Datum of 1983 (National Spatial Reference System 2011)
GRS_1980
6378137.000000
298.257222101
2021014FA_Truro_ortho_10cm
A raster dataset (unsigned 8-bit integer GeoTIFF format) with encoded RGB values of Head of the Meadow Beach in Massachusetts as recorded on February 4, 2021. Pixel resolution is 10-cm. Pixel based raster matrix with 3 layers of information for each pixel.
Producer defined
Band_1
Red wavelength band
Agisoft Metashape
0
255
Band_2
Green wavelength band
Agisoft Metashape
0
255
Band_3
Blue wavelength band
Agisoft Metashape
0
255
There are no text attributes associated with a binary GeoTIFF image. The horizontal projection is in NAD83(2011). There are no 'no-data' values within the ortho.
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
GeoTIFF file 2021014FA_Truro_ortho_10cm.tif is an unsigned 8-bit integer representing the orthomosaic image of the survey area at Head of the Meadow Beach, Truro, MA.
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
unsigned 8-bit integer GeoTIFF
GeoTIFF of the orthomosaic for Head of the Meadow Beach, Truro MA on February 4, 2021.
33.9
https://cmgds.marine.usgs.gov/data/field-activity-data/2021-014-FA/data/Imagery/2021014FA_Truro_ortho_10cm.tif
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, the second to the field data page, and the third link is to the publication landing page.
None.
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
None
None