Multibeam backscatter data collected during USGS Field Activity 2021-004-FA, using a dual-head Teledyne SeaBat T20-P multibeam echo sounder (8-bit GeoTIFF, UTM Zone 19N, WGS84, 1-m resolution)

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Seth D. Ackerman
Publication_Date: 20231114
Title:
Multibeam backscatter data collected during USGS Field Activity 2021-004-FA, using a dual-head Teledyne SeaBat T20-P multibeam echo sounder (8-bit GeoTIFF, UTM Zone 19N, WGS84, 1-m resolution)
Edition: 1.0
Geospatial_Data_Presentation_Form: raster digital data
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9GO90TI
Publication_Information:
Publication_Place:
Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts
Publisher:
U.S. Geological Survey, Coastal and Marine Hazards and Resources Program
Online_Linkage: https://doi.org/10.5066/P9GO90TI
Online_Linkage:
https://cmgds.marine.usgs.gov/data-releases/datarelease/10.5066-P9GO90TI/
Larger_Work_Citation:
Citation_Information:
Originator: Seth D. Ackerman
Originator: David S. Foster
Originator: Charles R. Worley
Originator: Alexander R. Nichols
Publication_Date: 2023
Title:
High-resolution geophysical and geological data collected from outer Cape Cod, Massachusetts during USGS Field Activity 2021-004-FA
Edition: 1.0
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9GO90TI
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Other_Citation_Details:
Suggested citation: Ackerman, S.D., Foster, D.S., Worley, C.R., and Nichols, A.R., 2023, High-resolution geophysical and geological data collected from outer Cape Cod, Massachusetts during USGS Field Activity 2021-004-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P9GO90TI.
Online_Linkage: https://doi.org/10.5066/P9GO90TI
Online_Linkage:
https://cmgds.marine.usgs.gov/data-releases/datarelease/10.5066-P9GO90TI/
Description:
Abstract:
The U.S. Geological Survey (USGS) Woods Hole Coastal and Marine Science Center (WHCMSC) completed a bathymetric and shallow seismic-reflection survey during the period of June 9, 2021 to June 24, 2021 in water depths from 2 m to 30 m for a portion of the outer Cape Cod nearshore environment between Marconi and Nauset Beaches. The products from this survey will help to support white shark research on their shallow-water behavior in the dynamic nearshore environment at Cape Cod National Seashore (CACO). CACO visitors’ safety is threatened by interactions between the public and white sharks. This project provides CACO with baseline data and information on nearshore white shark habitat, specifically in the nearshore shoreface, bathymetric trough, and longshore bar. This data release provides the geophysical data collected from outer Cape Cod during USGS Field Activities 2021-002-FA in 2021.
Purpose:
This dataset provides a high-resolution multibeam backscatter mosaic of the seabed created from sonar data collected by the U.S. Geological Survey during survey 2021-004-FA from outer Cape Cod, Massachusetts. The multibeam backscatter mosaic will be used in conjunction with other geophysical and sample data to investigate the morphology and geologic framework of the sea floor and coastal environment of Massachusetts.
Supplemental_Information:
Support for 2021-004-FA was provided to the USGS from the National Park Service, Cape Cod National Seashore. Additional information on the field activities associated with this project are available at https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-004-FA
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20210609
Ending_Date: 20210624
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -69.98096
East_Bounding_Coordinate: -69.91185
North_Bounding_Coordinate: 41.94450
South_Bounding_Coordinate: 41.78170
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:ad60034f-7890-4770-80f8-da442815e892
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Woods Hole Coastal and Marine Science Center
Theme_Keyword: WHCMSC
Theme_Keyword: Coastal and Marine Hazards and Resources Program
Theme_Keyword: CMHRP
Theme_Keyword: Department of the Interior
Theme_Keyword: DOI
Theme_Keyword: Cape Cod National Seashore
Theme_Keyword: CACO
Theme_Keyword: National Park Service
Theme_Keyword: NPS
Theme_Keyword: Massachusetts Office of Coastal Zone Management
Theme_Keyword: CZM
Theme_Keyword: MassCZM
Theme_Keyword: field activity number 2021-004-FA
Theme_Keyword: RV Rafael
Theme_Keyword: GeoTIFF
Theme_Keyword: multibeam echo sounder
Theme_Keyword: multibeam backscatter
Theme_Keyword: Reson
Theme_Keyword: Teledyne SeaBat
Theme_Keyword: T20P
Theme_Keyword: backscatter
Theme_Keyword: Marine Geology
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: oceans
Theme_Keyword: geoscientificInformation
Theme_Keyword: imageryBaseMapsEarthCover
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: multibeam sonar
Theme_Keyword: sea-floor acoustic reflectivity
Theme_Keyword: marine geophysics
Theme_Keyword: marine geology
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: United States of America
Place_Keyword: Atlantic Ocean
Place_Keyword: Atlantic Margin
Place_Keyword: Cape Cod
Place_Keyword: Massachusetts
Place_Keyword: Orleans
Place_Keyword: Eastham
Place_Keyword: Wellfleet
Place_Keyword: Marconi Beach
Place_Keyword: Nauset Beach
Stratum:
Stratum_Keyword_Thesaurus: None
Stratum_Keyword: sea floor
Stratum_Keyword: seafloor
Temporal:
Temporal_Keyword_Thesaurus: None
Temporal_Keyword: 2021
Access_Constraints: none
Use_Constraints:
Public domain data from the U.S. Government are freely distributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Seth Ackerman
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2315
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: sackerman@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name:
https://cmgds.marine.usgs.gov/data-releases/media/2022/10.5066-P9GO90TI/f156c9410ccc491faa58b6233574f861/2021-004-FA_T20P_Backscatter_1m_browse.jpg
Browse_Graphic_File_Description:
Thumbnail image of 1-m multibeam echo sounder backscatter data collected from outer Cape Cod, Massachusetts.
Browse_Graphic_File_Type: JPEG
Data_Quality_Information:
Logical_Consistency_Report:
This backscatter mosaic represents processed dual-head Teledyne SeaBat T20-P multibeam echo sounder (MBES) time series data gridded at 1-m resolution. Quality control and data processing were conducted to remove spurious points and reduce sound speed artifacts (refraction) using CARIS HIPS (version 11.3) and QPS FMGT (version 7.10.0). Despite this processing, small areas of vessel motion and refraction artifacts remain in the data. Small "no data" gaps exist throughout the dataset. These are the result of editing the artifacts and, in some areas, eliminating low quality soundings. In addition, gaps exist in shallow areas where underwater obstructions created hazards for the safe navigation of the survey vessel.
While navigation and attitude data in the backscatter data and coincident bathymetry data (see larger work citation https://doi.org/10.5066/P9GO90TI) are identical the extents of the processed bathymetry grid and backscatter mosaic differs slightly due to differences in processing. Cross lines, collected to check tide corrections in bathymetry data and to provide dip angle seismic profile data, were not added to this backscatter imagery.
Completeness_Report:
Data were collected on the following dates: 20210609 and 20210615-20210624 (Julian day 160 and 166-175); several lines of bathymetry data was collected on 20210609 (Julian day 160) while the survey team was out testing the seismic system before the formal start of the survey. Data collected during some turns and along lines that extend beyond the area of a continuous bathymetry data were excluded.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Navigation data were acquired using the WGS 84 coordinate system with an Applanix POS MV Wavemaster (model 220, V5), which blends Global Navigation Satellite Systems (GNSS) data, acceleration data from a Motion Reference Unit (MRU) and GPS azimuthal heading. The POS MV was configured with two AeroAntenna Technologies GPS antennas located at either end of a 2-m baseline, which was oriented athwartship and mounted atop the aft end of cabin. DGPS positions were obtained from the primary antenna located on the forward end of the baseline, and the positional offsets between the antenna and the navigational reference point (the POS MV IMU) were accounted for in the Applanix POSView (version 11.00) acquisition software. DGPS positions are horizontally accurate to 0.5 - 2 meters, but accuracy can increase to less than 10 cm after post-processing with Applanix POSPac (version 8.7).
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: Unpublished Material
Title: raw MBES data in s7k format
Geospatial_Data_Presentation_Form: digital data
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20210609
Ending_Date: 20210624
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation:
Teledyne SeaBat T20P multibeam echo sounder raw bathymetry and backscatter
Source_Contribution:
Multibeam echosounder (MBES) bathymetry and backscatter data were collected using dual-head Teledyne SeaBat T20-P sonars. The pair of mills cross transmit and receive arrays were mounted side-by-side within a bracket that oriented them at opposing 30-degree angles (relative to horizontal). The bracket was pole-mounted on the starboard side of the R/V Rafael so that the sonar arrays were oriented athwart ships (primary and secondary arrays facing outward and down to port and starboard, respectively) and located approximately 1.235 m below the waterline when deployed. Vessel navigation and attitude data were acquired using an Applanix POS MV Wavemaster (model 220, V5) configured with two AeroAntenna Technologies GPS antennas located at either end of a 2-m baseline, which was oriented athwartship and mounted atop the aft end of cabin, and the wetpod MRU mounted atop the sonar bracket just aft of the pole. An AML Micro X SV mounted on the sonar bracket monitored sound speed near the sonars during acquisition, and an AML Minos X SVPT was used to collect water column sound speed profiles 1 to 3 times each survey day. The Teledyne SeaBat User Interface (version 5.0.0.18) was used to control the sonars, which were operated in intermediate mode at full power (220 dB), with frequency-modulated pulses centered at 400 kHz. The range of across track beams (2048 for JD 160, 1024 for the rest of the survey) formed by the sonars were adjusted manually depending on water depth, and resulted in combined swath widths of 50 to 250 meters or typically 3 to 6 times the water depth. Data were monitored and recorded using the Teledyne SeaBat User Interface (UI) (version 5.0.0.18) and Hypack Hysweep (version 2021, 21.1.3.0). The SeaBat User Interface logged the navigation, attitude, bathymetry, time-series backscatter, and water column data to s7k format files for each sonar. The s7k line files were created by the Teledyne SeaBat UI using the following naming convention: M/S_YYYYMMDD_HHMMSS. The line files were appended with an "M" and "S" prefix to denote the port (or main/primary) "M" and "S" starboard (or secondary) sonar heads, respectively. Hypack Hysweep 2021 also was used to log the navigation, attitude, and bathymetry data for both sonars to a single HSX format file. Hypack Hysweep filenames have the format 'LLL_HHMM', where LLL indicates the three digit planned line number and HHMM is the UTC time. The Teledyne SeaBat User Interface s7k data were used to produce the final processed backscatter mosaic.
Process_Step:
Process_Description:
PROCESSING STEP 1: CARIS HIPS DATA PROCESSING. Multibeam bathymetry processing within CARIS HIPS (version 11.3) during the survey consisted of the following flow:
1) Vessel configuration files were created in CARIS for the Main and Secondary s7k sonar files (Rafael_DualT20P_s7k_M.hvf and Rafael_DualT20P_s7k_S.hvf, respectively) which includes, linear and angular installation offsets for each T20-P unit as well as vendor specified uncertainty values for each of the survey sensors.
2) A CARIS HIPS project (version 11.3) was created with projection information set to Universal Transverse Mercator (UTM) Zone 19N, WGS84 using the vessel configuration file from step 1.1.
3) Each s7k file was imported to the new CARIS project using the Import/Conversion Wizard.
4) Delayed heave data from raw POS MV files (.000) were used to update HIPS survey lines using the import auxiliary data function.
5) Georeference Bathymetry was done to apply the sound velocity corrections from the final SVP files containing all the sound velocity profiles collected for each survey day, specifying the nearest in time method, 'delayed' heave source, and use surface sound speed. SVP files for each survey day were created as part of the sound velocity profile processing workflow, see SVP dataset in the larger work citation.
6) Each survey line was exported in GSF format for pairing with the corresponding raw s7k files in QPS FMGT (see next step).
The contact person for this and all subsequent processing steps below is Seth Ackerman.
Process_Date: 202106
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Seth Ackerman
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2315
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: sackerman@usgs.gov
Process_Step:
Process_Description:
PROCESSING STEP 2: QPS FMGT PROCESSING
Backscatter mosaics were created using QPS FMGT (v. 7.10.0) processing software. Raw s7k files containing the time series values, were paired with the GSF data exported from each survey line file containing the depth data to create a 1-meter resolution time series backscatter mosaic that followed the steps below.
1) Create new FMGT project for the Outer Cape survey are using UTM 19N, WGS 84 coordinate system.
2) Set processing parameters for T20-P Sonar (defaults)
3) Set filter method to flat 300
4) Add source/paired files using the T20P s7k files for the backscatter files, and GSF files exported from CARIS HIPS. All the s7k and GSF files were added by Julian day. Once the line files were added to the project a 1-meter draft mosaic was created using the "time-series" as the backscatter source for each Julian day for review.
5) Final 1-meter mosaics were created for each survey area (off Marconi and Nauset beach) and visually reviewed for inconsistencies or anomalies. Gaps in the main survey lines were filled with gap-fill data if available. Individual line files were moved up or down in the mosaic order to increase quality if needed. The "Backscatter Adjustment" tool was used to increase or decrease intensity of individual lines as required to visually match adjacent lines.
6) The resulting mosaics were exported out of QPS FMGT as 8-bit gray-scale GeoTIFFs.
Process_Date: 20221223
Process_Step:
Process_Description:
PROCESSING STEP 3: MERGING GEOTIFF MOSAICS
Using Global Mapper (version 24.0), the individual GeoTIFFs were exported as a single 8-bit unsigned integer GeoTIFF. The NODATA value for this GeoTIFF is 255.
Process_Date: 20221223
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 18014
Column_Count: 5538
Vertical_Count: 1
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: 0.9996
Longitude_of_Central_Meridian: -69
Latitude_of_Projection_Origin: 0
False_Easting: 500000
False_Northing: 0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 1.0
Ordinate_Resolution: 1.0
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: WGS_1984
Ellipsoid_Name: WGS_84
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257223563
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
Acoustic reflectance values of the nearshore sea floor from outer Cape Cod, Massachusetts.
Entity_and_Attribute_Detail_Citation: U.S. Geological Survey
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Coastal and Marine Hazards and Resources Program
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2315
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: whsc_data_contact@usgs.gov
Resource_Description:
Multibeam backscatter data collected from outer Cape Cod, Massachusetts during USGS Field Activity 2021-004-FA, using a dual-head Teledyne SeaBat T20-P multibeam echo sounder: includes the GeoTIFF image 2021-004-FA_T20P_Backscatter_1m.tif, world file 2021-004-FA_T20P_Backscatter_1m.tfw, browse graphic 2021-004-FA_T20P_Backscatter_1m_browse.jpg, and Federal Geographic Data Committee (FGDC) Content Standards for Digital Geospatial Metadata (CSDGM) metadata files (2021-004-FA_T20P_Backscatter_1m_meta.xml)
Distribution_Liability:
Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by 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.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: GeoTIFF
Format_Version_Number: Global Mapper
Format_Specification: 8-bit GeoTIFF file
Format_Information_Content:
GeoTIFF image file derived from MBES backscatter data collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center during survey 2021-004-FA and the associated metadata.
File_Decompression_Technique: Use any zip decompression utility (e.g. 7zip, Keka, WinZip)
Transfer_Size: 16
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
https://cmgds.marine.usgs.gov/data-releases/media/2022/10.5066-P9GO90TI/f16663e572384397a85e4624e164c213/2021-004-FA_T20P_Backscatter_1m.zip
Network_Resource_Name:
https://cmgds.marine.usgs.gov/data-releases/datarelease/10.5066-P9GO90TI/
Network_Resource_Name: https://doi.org/10.5066/P9GO90TI
Access_Instructions:
The data can be downloaded using the Network Resource Name links. The first link is a direct link to download the zipped file of data. The second and third links are to a landing page for the entire data release where the data, metadata, and browse graphic can be downloaded.
Fees: none
Technical_Prerequisites:
To utilize these data, the user must have software capable of viewing GeoTIFF files.
Metadata_Reference_Information:
Metadata_Date: 20231114
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Seth Ackerman
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2315
Contact_Facsimile_Telephone: 508-457-2310
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 the USGS.
Metadata_Standard_Name: Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/DRB_data_release/DRB_P9GO90TI/2021-004-FA_T20P_Backscatter_1m_meta.html>
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