Digital surface model representing Head of the Meadow Beach, Truro from images taken during field activity 2020-015-FA on March 6, 2020

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 2021
Title:
Digital surface model representing Head of the Meadow Beach, Truro from images taken during field activity 2020-015-FA on March 6, 2020
Edition: 1.0
Geospatial_Data_Presentation_Form: raster digital data
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9KSG1RQ
Publication_Information:
Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA
Publisher:
U.S. Geological Survey, Coastal and Marine Hazards and Resources Program
Online_Linkage: https://doi.org/10.5066/P9KSG1RQ
Online_Linkage: Larger_Work_Citation:
Citation_Information:
Originator: C. Sherwood
Originator: P. Traykovski
Originator: J. Over
Originator: J. Borden
Originator: S. Brosnahan
Originator: E. Marsjanik
Originator: M. Martini
Publication_Date: 2021
Title:
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
Edition: 1.0
Geospatial_Data_Presentation_Form: raster digital files
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9KSG1RQ
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Other_Citation_Details:
Over, J.R., Sherwood, C.R., Traykovski, P., Brosnahan, S.M., Martini, M.A., Marsjanik, E., Borden, J., 2021, Topographic and bathymetric data, sediment samples, and beach imagery collected at Head of the Meadow, Truro in March 2020, U.S Geological Survey Field Activity 2020-015-FA: U.S Geological Survey data release, https://doi.org/10.5066/P9KSG1RQ.
Online_Linkage: https://doi.org/10.5066/P9KSG1RQ
Description:
Abstract:
The data in this release map the beach and nearshore environment at Head of the Meadow Beach in Truro, MA and provide environmental context for the camera calibration information for the 2019 CoastCam installation that looks out at the coast shared by beachgoers, shorebirds, seals, and sharks. This is related to the field activity 2020-015-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 the CoastCam, which are two video cameras aimed at the beach. On March 4, 6, and 10, 2020, U.S Geological Survey and Woods Hole Oceanographic Institution (WHOI) scientists conducted field surveys to collect position and orientation information for the CoastCam cameras and map the field of view. 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 and at periodic locations of plywood targets moved throughout the day within the CoastCam view. Grain-size analysis was performed on sediment samples collected with a spade along multiple profiles from the bluff base to the intertidal zone. Images of the beach were taken with a camera (Ricoh GRII) and a post-processed kinematic (PPK) system attached to a kitesurfing kite, and high-precision 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. 1.6.1) 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.
Purpose:
This digital elevation model, as constructed using structure-from-motion from the images in the 2020015FA_Truro_f1.zip and 2020015FA_Truro_f2.zip files, represents 0.1778 square kilometers of Head of the Meadow Beach in view of the CoastCam cameras on March 6, 2020.
Supplemental_Information:
For more information about the WHCMSC Field Activity, see https://cmgds.marine.usgs.gov/fan_info.php?fan=2020-015-FA.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20200306
Ending_Date: 20200306
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Not planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -70.08026794
East_Bounding_Coordinate: -70.07504847
North_Bounding_Coordinate: 42.05323850
South_Bounding_Coordinate: 42.04944175
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:d286f22c-685d-41fb-b5cf-c63d22a74302
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Hazards and Resources Program
Theme_Keyword: CMHRP
Theme_Keyword: Woods Hole Coastal and Marine Science Center
Theme_Keyword: WHCMSC
Theme_Keyword: Structure from Motion
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: remote sensing
Theme_Keyword: digital elevation models
Theme_Keyword: datasets
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation
Theme_Keyword: elevation
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: USA
Place_Keyword: Truro
Place_Keyword: Massachusetts
Place_Keyword: Head of the Meadow Beach
Place_Keyword: Cape Cod National Seashore
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.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jin-Si Over
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing and physical address
Address: U.S. Geological Survey
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2269
Contact_Electronic_Mail_Address: jover@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name: 2020015FA_Truro_DSM_browse.JPG
Browse_Graphic_File_Description:
Height-colored image of topography data collected on Head of the Meadow Beach, Truro MA
Browse_Graphic_File_Type: JPG
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The postional information used on the kite and ground control point datasets and metadata are available in the imagery and navigational components of the larger work citation.
Logical_Consistency_Report:
All data fall into expected ranges except for points near and offshore of the waterline, where the data returned can be noisy and may result in erroneous measurements. This is a digital surface model (DSM) and includes returns from vegetation.
Completeness_Report:
The structure-from-motion process that builds the Digital Surface Model uses all the available imagery and location information at the start, however not all images may align in the software to produce the final product. Users are advised to read the rest of the metadata record carefully for additional details.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Navigation information was aquired from a GNSS receiver (EMLID Reach M2) in PPK mode with a Multi-band GNSS antenna that has an estimated horizontal accuracy of 5 meters.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The location information was aquired from a GNSS receiver (EMLID Reach M2) in PPK mode with a Multi-band GNSS antenna and hotshoe adapter with an estimated vertical accuracy of 5 m. The ground control points used have centimeter vertical accuracies.
Lineage:
Process_Step:
Process_Description:
Digital Surface Model was created in Agisoft Metashape v. 1.6.1 using the following steps:
1. Project created, imagery (located in larger work citation 2020015FA_Truro_f1.zip and 2020015FA_Truro_f2.zip) and position (located in larger work citation 2020015FA_Truro_f1_photolocations.csv and 2020015FA_Truro_f2_photolocations.csv) data were brought in using the NAD83(2011) datum.
2. Photos were aligned at high accuracy (the pixels are not subsampled for increased processing speed) with a keypoint limit of 40,000 and unlimited tie points. Alignment uses the positions and matching pixels between images to create point clouds and put the imagery into a realworld spatial context. Photos that failed to align/find tie points contained breaking waves and water, but are kept in the project to reconstruct the orthomosaic because they are still spatially orientated even if they do not contribute to the elevation model. Metashape software refined and optimized the camera positions and lens model in a least squares sense to minimize the reprojection error or the distance between the measured points and the software created points.
3. Eleven ground control points (GCPs) (2020015FA_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. A dense point cloud was generated using high quality (images are not subsampled) and a low frequency filtering algorithm. Accuracies for the GCPs were set 0.01 m and accuracies for the camera positions were set to 0.05 m, resulting in a total GCP error of 0.21 m. The dense point cloud was then edited to remove noise by filtering by point confidence before generating a digital elevation model (the software calls all models elevation models, but technically it is a surface model because it includes non bare earth returns, a terrain model would be only bare earth returns).
5. The digital surface model is exported from the software at a resolution of 25 cm and in NAD83(2011)/UTM Zone 19N (ESPG:6348) and GEOID 12B NAVD88 in meters.
Process_Date: 20200323
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Peter Traykovski
Contact_Organization: Woods Hole Oceanographic Institue
Contact_Position: Associate Scientist
Contact_Address:
Address_Type: mailing and physical address
Address: 226 Woods Hole Rd, MS #12
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543
Contact_Voice_Telephone: 508-289-2638
Contact_Electronic_Mail_Address: ptraykovski@whoi.edu
Process_Step:
Process_Description: Corrected a thesaurus keyword.
Process_Date: 20210514
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Pixel
Row_Count: 1666
Column_Count: 1708
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
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_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 0.25
Ordinate_Resolution: 0.25
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name:
North American Datum of 1983 (National Spatial Reference System 2011)
Ellipsoid_Name: GRS_1980
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 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
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
Pixels represent elevation in meters relative to North American Vertical Datum of 1988 (NAVD88). GeoTIFF was created from the dense point cloud in Agisoft Metashape with interpolation enabled. The no-data value is -32767.
Entity_and_Attribute_Detail_Citation: USGS Field Activity 2020-015-FA
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jin-Si Over
Contact_Organization: U.S. Geological Survey
Contact_Position: geographer
Contact_Address:
Address_Type: mailing and physical
Address: U.S. Geological Survey
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2269
Contact_Electronic_Mail_Address: jover@usgs.gov
Resource_Description:
GeoTIFF file 2020015FA_Truro_DSM_25cm.tif as a 32-bit floating point digital surface model (DSM).
Distribution_Liability:
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.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: GeoTIFF
Format_Version_Number: 1.0.0
Format_Specification: 32-bit floating point GeoTIFF format
Format_Information_Content:
GeoTIFF file containing 32-bit floating point DSM of Head of the Meadow Beach, Truro MA on March 6, 2020.
Transfer_Size: 2.961
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Access_Instructions:
The first link in the list above is to the field data page and the second link is to the publication landing page.
Fees: None.
Metadata_Reference_Information:
Metadata_Date: 20210514
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jin-Si Over
Contact_Organization: U.S. Geological Survey
Contact_Position: geographer
Contact_Address:
Address_Type: mailing and physical
Address: U.S. Geological Survey
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2269
Contact_Electronic_Mail_Address: jover@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Access_Constraints: None
Metadata_Use_Constraints: None

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