Metadata: Identification_Information: Citation: Citation_Information: Originator: Jin-Si R. Over Publication_Date: 20220919 Title: Digital surface model representing Head of the Meadow Beach, Truro on March 10, 2022 Edition: 1.0 Geospatial_Data_Presentation_Form: raster digital data Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9GEVWG1 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/P9GEVWG1 Online_Linkage: https://www.sciencebase.gov/catalog/item/62e0077bd34e952be9098180 Larger_Work_Citation: Citation_Information: Originator: Jin-Si R. Over Originator: Chris R. Sherwood Originator: Peter A. Traykovski Publication_Date: 2022 Title: 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 Edition: 1.0 Geospatial_Data_Presentation_Form: digital data Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9GEVWG1 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: Suggested Citation: 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 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. Online_Linkage: https://doi.org/10.5066/P9GEVWG1 Online_Linkage: https://www.sciencebase.gov/catalog/item/62dee095d34e952be909417b Description: 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 imagery, which was merged with the bathymetry in MATLAB (v. 2020b) to create a continuous topobathy product. Purpose: A high-resolution elevation dataset of Head of the Meadow Beach to observe ground conditions and temporal change and to validate the CoastCam observations. Supplemental_Information: This digital surface model (DSM), as constructed using structure from motion from the images in the 2022015FA_Truro_f1.zip folder in the greater work citation, represents Head of the Meadow Beach in view of CoastCam CACO-01 cameras. The product 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=2022-015-FA. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20220310 Currentness_Reference: ground condition; represents the state of the beach on March 10, 2022 Status: Progress: Complete Maintenance_and_Update_Frequency: Not planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -70.07968348 East_Bounding_Coordinate: -70.07421147 North_Bounding_Coordinate: 42.05305720 South_Bounding_Coordinate: 42.04950571 Keywords: 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: CoastCam Theme_Keyword: Helikite Theme_Keyword: Agisoft Metashape Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: remote sensing Theme_Keyword: digital elevation models Theme_Keyword: datasets Theme_Keyword: structure from motion Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme_Keyword: elevation Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:62e0077bd34e952be9098180 Place: Place_Keyword_Thesaurus: Common geographic areas Place_Keyword: United States Place_Keyword: Truro Place_Keyword: Massachusetts Place_Keyword: Cape Cod Access_Constraints: None Use_Constraints: 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. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jin-Si R. Over Contact_Organization: U.S. Geological Survey, Northeast Region Contact_Position: Geographer Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x2297 Contact_Electronic_Mail_Address: jover@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: https://www.sciencebase.gov/catalog/file/get/62e0077bd34e952be9098180?name=2022015FA_Truro_DSM_browse.JPG&allowOpen=true Browse_Graphic_File_Description: Elevation-colored image of topography data collected from Head of the Meadow Beach, Truro, MA Browse_Graphic_File_Type: JPEG Native_Data_Set_Environment: Metashape 1.8.1, QGIS 3.2.2 Cross_Reference: Citation_Information: Originator: Jin-Si R. Over Originator: Chris R. Sherwood Originator: Peter A. Traykovski Originator: Sandra M. Brosnahan Originator: Marinna A. Martini Originator: Eric Marsjanik 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 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 Other_Citation_Details: This publication is the original/first survey data of Head of the Meadow beach from 2020. Online_Linkage: https://doi.org/10.5066/P9KSG1RQ Cross_Reference: Citation_Information: Originator: Jin-Si R. Over Originator: Christopher R. Sherwood Originator: Peter A. Traykovski Originator: Sandra M. Brosnahan Originator: Marinna A. Martini Originator: Eric Marsjanik Originator: Jonathan S. Borden Publication_Date: 2021 Title: Topographic and bathymetric data, sediment samples, and beach imagery collected at Head of the Meadow, Truro in March 2020 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 Other_Citation_Details: This publication is the 2020 field data at Head of the Meadow Beach. Online_Linkage: https://doi.org/10.5066/P9KSG1RQ Cross_Reference: Citation_Information: Originator: Jin-Si R. Over Originator: Christopher R. Sherwood Originator: Peter A. Traykovski Publication_Date: 2022 Title: 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 Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9D94NZ3 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 Other_Citation_Details: This publication is the 2021 field data at Head of the Meadow Beach. Online_Linkage: https://doi.org/10.5066/P9D94NZ3 Cross_Reference: Citation_Information: Originator: Jin-Si R. Over Originator: Andrew C. Ritchie Originator: Christine Kranenburg Originator: Jennifer (Jenna) A. Brown Originator: Daniel D. Buscombe Originator: Tom Noble Originator: Christopher R. Sherwood Originator: Jonathan Warrick Originator: Phillipe Wernette Publication_Date: 2021 Title: Processing coastal imagery with Agisoft Metashape Professional Edition, version 1.6-Structure from motion workflow documentation Series_Information: Series_Name: Open-File Report Issue_Identification: 2021-1039 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: This publication includes the general methodology for processing imagery in Metashape to produce digital elevation models and ortho products. Online_Linkage: https://doi.org/10.3133/ofr20211039 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Ground control points (GCPs) were used to constrain the products – see associated metadata for details. GCP error in the Metashape project was used to assess overall error in the product. Logical_Consistency_Report: All data fall into expected elevation ranges compared to previous surveys (see cross references) 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 DSM 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. The topographic surface does have interpolated elevation data to fill holes. The product output from Metashape was clipped in QGIS to remove obvious areas of interpolation and erroneous values on the outer edges of the DSM. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: 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 cm. However, using these values in Metashape returned a poor product so the accuracy was loosened to 10 cm to accommodate the unknown horizontal offset of the GPS to the camera and to rely more on the ground control points, which have a theoretical accuracy of 1-2 cm. The horizontal root mean square error (RMSE) of the GCPs was xy: 0.092, 0.104 (m). The final product was compared to the previous survey at Head of the Meadow (see first cross-reference) and aligned at stable points. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: The location information was acquired from a GNSS receiver (EMLID Reach M2) in PPK mode with a Multi-band GNSS antenna and hot shoe adapter with an estimated vertical accuracy of 2 cm. However, using these values in Metashape returned a poor product so the accuracy was loosened to 5 cm to rely more on the ground control points, which have a theoretical accuracy of 1-2 cm. The total vertical RMSE of the GCPs was 0.017 m. The final product was compared to the previous survey at Head of the Meadow (see first cross-reference) and the z differences at stable points were within 10 cm. Lineage: Process_Step: Process_Description: The Digital Surface Model was created in Agisoft Metashape v. 1.8.1 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 2022015FA_Truro_f1.zip) and positions (located in larger work citation 2022015FA_Truro_f1_photolocations.csv) were imported using the NAD83(2011)/UTM19N and NAVD88 datums. An 0.15 m GNSS/IPS offset in the z direction was used to represent the approximate offset of the GNSS mount and camera on the Helikite. 2. Photos were aligned at a low accuracy so that GCPs could be automatically detected in the point cloud. Eighteen GCPs (2022015FA_Truro_nav_GCPs.csv located in the larger work citation) were found in the images and then added to the project in the reference systems NAD83(2011)/UTM Zone 19N and NAVD88. Accuracies for the GCPs were set to 0.02 m and accuracies for the camera positions were set to 0.10 m, but the positions were only used as check points and to speed up alignment, as they were unchecked in the software. The photos were re-aligned with high accuracy (the pixels were not subsampled increase processing speed) using a keypoint limit of 40,000 and unlimited tie points. 3. The alignment process matched pixels between images to create point clouds and put the imagery into a relative spatial context using the photo positions and GCPs. Then, the Metashape software refined and optimized the camera positions and lens model using least squares with gradual selection parameters of Ru = 15, Pa = 4, and Re = 0.35 to minimize the reprojection error or the distance between the measured points and the software-created points. 4. A dense point cloud was generated using the high-quality setting (images were not subsampled) and a low-frequency filtering algorithm. 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 a surface model includes vegetation/canopy returns; a terrain model would be only bare earth returns). 4. The DSM product was exported at 25 cm in NAD83(2011) UTM Zone 19N and NAVD88 (m). Process_Date: 202203 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jin-Si R. Over Contact_Organization: U.S. Geological Survey, Northeast Region Contact_Position: Geographer Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1258 Contact_Voice_Telephone: 508-548-8700 x2297 Contact_Electronic_Mail_Address: jover@usgs.gov Process_Step: Process_Description: The DSM was opened in QGIS and a shapefile was created (not included in this data release) that excluded areas of interpolation and obviously erroneous elevation points on the outer edge. The DSM was then clipped to this shapefile and turned into a cloud-optimized GeoTIFF (COG) using gdal_translate with the following command: 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 (v. 3.1.4 accessed October 20, 2020 https://gdal.org/), where i is the name of each GeoTIFF section. Process_Date: 202207 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jin-Si R. Over Contact_Organization: U.S Geological Survey, Northeast Region Contact_Position: Geographer Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd City: Woods Hole State_or_Province: MA Postal_Code: 02543 Contact_Voice_Telephone: 508-548-8700 x2297 Contact_Electronic_Mail_Address: jover@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Pixel Row_Count: 1556 Column_Count: 1793 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: 0.1 Ordinate_Resolution: 0.1 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, using geoid 18 Altitude_Resolution: 0.001 Altitude_Distance_Units: meters Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: 2022015FA_Truro_DSM_25cm.tif Entity_Type_Definition: A raster dataset (cloud-optimized GeoTIFF format) with encoded elevation values of Head of the Meadow Beach in Truro, MA on March 10, 2022. Pixel resolution is 25 cm. Entity_Type_Definition_Source: producer defined Attribute: Attribute_Label: Value Attribute_Definition: Surface elevation orthometric height NAVD88 (m) using Geoid 18 in NAD83(2011) UTM Zone 19N, (no data value = -3.4028234663852886e+38). Attribute_Definition_Source: producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: -3.4028234663852886e+38 Enumerated_Domain_Value_Definition: No data Enumerated_Domain_Value_Definition_Source: Producer-defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -1.59 Range_Domain_Maximum: 24.107 Attribute_Units_of_Measure: meters Overview_Description: Entity_and_Attribute_Overview: Pixels represent elevation in meters relative to North American Vertical Datum of 1988 (NAVD88). The filename is formatted as "2022015FA_Truro_DSM_25cm_cog.tif", where 2022015 is the USGS Field activity ID, location is Truro where Head of the Meadow Beach is, DSM is Digital Surface Model, 25cm indicates the resolution of the grid, and cog is cloud optimized GeoTIFF. Entity_and_Attribute_Detail_Citation: USGS Field Activity 2022-015-FA Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Jin-Si R. Over Contact_Organization: U.S. Geological Survey, Northeast Region Contact_Position: Geographer Contact_Address: Address_Type: mailing and physical Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x2297 Contact_Electronic_Mail_Address: jover@usgs.gov Resource_Description: GeoTIFF file 2022015FA_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: Encoded surface elevation of Head of the Meadow Beach, Truro MA on March 10, 2022. Transfer_Size: 4.32 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/62e0077bd34e952be9098180 Network_Resource_Name: https://www.sciencebase.gov/catalog/item/62e0077bd34e952be9098180 Network_Resource_Name: https://doi.org/10.5066/P9GEVWG1 Access_Instructions: The first link in the list above is to directly download the GeoTIFF, the second to the data page, and the third link is to the publication landing page. Fees: None. Metadata_Reference_Information: Metadata_Date: 20220919 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jin-Si R. Over Contact_Organization: U.S. Geological Survey, Northeast Region 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 x2297 Contact_Electronic_Mail_Address: 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_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Access_Constraints: None Metadata_Use_Constraints: None