Archive of Chirp Subbottom Profile, Imagery, and Geospatial Data Collected in May 2023 from Oahu, Hawaii

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Arnell S. Forde
Publication_Date: 20240129
Title:
Archive of Chirp Subbottom Profile, Imagery, and Geospatial Data Collected in May 2023 from Oahu, Hawaii
Geospatial_Data_Presentation_Form: SEG-Y, tabular, vector, and raster digital data
Larger_Work_Citation:
Citation_Information:
Originator: Arnell S. Forde
Originator: Emily A. Wei
Originator: Chelsea A. Stalk
Publication_Date: 20240129
Title:
Archive of Chirp Subbottom Profile Data Collected in 2023 From Oahu, Hawaii
Series_Information:
Series_Name: U.S. Geological Survey data release
Issue_Identification: doi:10.5066/P9I2T4ZE
Publication_Information:
Publication_Place: St. Petersburg, Florida
Publisher:
U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
Online_Linkage: https://doi.org/10.5066/P9I2T4ZE
Description:
Abstract:
As part of the Coastal Sediment Availability and Flux and Defense Advanced Research Protection Agency (DARPA) Reefense projects, scientists from the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center (SPCMSC) conducted a nearshore geophysical survey to map the shoreface and inner shelf, as well as characterizing stratigraphy near Oahu, Hawaii (HI) May 7-13, 2023. The purpose of this study was to conduct a geologic assessment (including bathymetric mapping) near Fort Hase Beach, Oahu, in support of efforts to construct an artificial coral reef offshore of Marine Corps Base Hawaii (MCBH). This publication serves as an archive of high-resolution chirp subbottom trace data, survey trackline map, navigation files, geographic information system (GIS) data, and formal Federal Geographic Data Committee (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM). Processed subbottom profile images are also provided. The archived trace data are in standard Society of Exploration Geophysicists (SEG) SEG-Y revision 1 format (Norris and others, 2002). In addition to this data release, the SEG-Y files can be downloaded from the USGS Coastal and Marine Geoscience Data System (CMGDS) at, https://cmgds.marine.usgs.gov.
Purpose:
The purpose of this data release is to archive digital chirp subbottom profile data and associated files collected during USGS Field Activity Number 2023-310-FA. Additional survey and data details are available from the USGS CMGDS at, https://cmgds.marine.usgs.gov/fan_info.php?fan=2023-310-FA.
Supplemental_Information:
Chirp systems use a signal of continuously varying frequency; the system used during this survey produces high-resolution, shallow-penetration (typically less than 75-milliseconds [ms]) profile images of sub-seafloor stratigraphy. The towfish contains a transducer that transmits and receives acoustic energy and is typically towed 1–2 meters (m) below the sea's surface. As transmitted acoustic energy intersects density boundaries, such as the seafloor or sub-surface sediment layers, energy is reflected toward the transducer, received, and recorded by a PC-based seismic acquisition system. This process is repeated at regular intervals (for example, 0.125 seconds [s]) and returned energy is recorded for a specific duration (for example, 50 ms). In this way, a two-dimensional (2D) image of the shallow geologic structure beneath the towfish is produced.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20230507
Ending_Date: 20230513
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -157.795000
East_Bounding_Coordinate: -157.724867
North_Bounding_Coordinate: 21.446094
South_Bounding_Coordinate: 21.409567
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:5132f091-9c5c-4d30-bc5b-e780b6291f2d
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation
Theme_Keyword: oceans
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: sub-bottom profiling
Theme_Keyword: marine geology
Theme_Keyword: geology
Theme_Keyword: coastal processes
Theme_Keyword: navigational data
Theme_Keyword: geospatial datasets
Theme_Keyword: field activity logs
Theme_Keyword: image collections
Theme:
Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: distributions
Theme_Keyword: physical habitats and geomorphology
Theme:
Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) Keywords
Theme_Keyword: seismic reflection profiling
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: seismic reflection
Theme_Keyword: chirp
Theme_Keyword: Society of Exploration Geophysicists
Theme_Keyword: SEG-Y
Theme_Keyword: barrier island mapping
Theme_Keyword: 2023-310-FA
Place:
Place_Keyword_Thesaurus: Common Geographic Areas
Place_Keyword: Hawaii
Place_Keyword: Oahu
Place_Keyword: Kailua
Place_Keyword: Southwest Pacific
Access_Constraints: None. These data are held in the public domain.
Use_Constraints:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. The U.S. Geological Survey requests to be acknowledged as originator of the data in future products or derivative research.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Arnell S. Forde
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: Mailing and physical
Address: 600 4th Street South
City: Saint Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: (727) 502-8000
Contact_Electronic_Mail_Address: aforde@usgs.gov
Data_Set_Credit:
Funding and (or) support for this study were provided by DARPA and the USGS Coastal and Marine Hazards and Resources Program. The authors thank Captain Joe Reich of Alyce C Sportfishing for his assistance in data collection and piloting the contracted Research Vessel (R/V) Alyce C. The authors would also like to thank Jessica Jimenez-Buscat, Lance Bookless, Jason Bowlen, Mark Edmonson, and Meagan Ostrem at Marine Corps Base Hawaii for their help coordinating base access and survey logistics. Finally, the authors wish to thank Ben Jones, Joshua Levy, Zhenhua Huang, and Robert Toonen at the University of Hawaii for help with survey planning, logistics, and coordination efforts. This document was improved by scientific/editorial and metadata reviews from VeeAnn Cross and Breanna Williams of the Woods Hole and St. Petersburg Coastal and Marine Science Centers, respectively.
Native_Data_Set_Environment:
Environment as of Metadata Creation: Microsoft Windows 10 Version 6.2 (Build 9200); Environmental Systems Research Institute (Esri) ArcMap 10.8.2; MacOS Ventura 13.6.1; Seismic Unix (Release 44).
Cross_Reference:
Citation_Information:
Originator: Norris, M.W.
Originator: Faichney, A.K.
Publication_Date: 2002
Title: SEG-Y rev 1 Data Exchange format
Series_Information:
Series_Name:
Society of Exploration Geophysicists, SEG Technical Standards Committee
Issue_Identification: Release 1.0, May 2002
Online_Linkage:
Cross_Reference:
Citation_Information:
Originator: Cohen, J.K.
Originator: Stockwell, J.W., Jr.
Publication_Date: 2010
Title:
Seismic Un*x Release No. 44: An open source software package for seismic research and processing
Publication_Information:
Publication_Place: Golden, Colorado
Publisher: Center for Wave Phenomena, Colorado School of Mines
Online_Linkage: https://github.com/JohnWStockwellJr/SeisUnix
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The validity or accuracy of marine subbottom profiles is highly qualitative and dependent on equipment and operating condition variables.
Logical_Consistency_Report:
These datasets are from one field activity with consistent instrument calibrations. No seismic reflection data were collected on DOY 128 (May 8, 2023) or 129 (May 9, 2023). Subbottom profiles that have less than 1000 shots recorded to their trace headers will not have a corresponding 1000-shot-interval shot file in 2023-310-FA_1000sht.csv, which is included in 2023-310-FA_nav.zip (Forde and others, 2023).
Completeness_Report:
A total of 84 seismic lines were collected during this field activity. Three lines were excluded from this data release (Forde and others 2023), due to equipment or acquisition issues, resulting in unusable data. More detail on acquisition conditions is available from the Excel spreadsheet 2023-310-FA_MBES_CHIRP_OPS_LOG.xlsx contained in 2023-310-FA_logs.zip (Forde and others, 2023). Please note, this log includes information about all data acquired during this field activity and is not limited to the data included in this seismic data release.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
As the subbottom profile data were acquired, the position of the vessel was continuously determined by an Applanix POS MV Wavemaster II inertial aided navigation system (IANS) integrated into the Norbit Winghead MBES, which is accurate to within 0.5-2 meters (m). To ensure consistent spacing between survey lines acquired aboard the R/V Alyce C, pre-determined trackline locations were imported into HYPACK 2021 navigation software and followed during seismic data collection. During acquisition, positions from the POS MV IANS were recorded and written to the seismic trace headers in arcseconds every 0.2 s and were subsequently converted to decimal degrees latitude and longitude coordinates (World Geodetic System of 1984, WGS84, realization G1150). The approximate 3-m offset between the chirp shot position and the vessel's IANS reference point of the Applanix system, the Inertial Measurement Unit (IMU), were not accounted for during acquisition, nor have the American Standard Code for Information Interchange (ASCII) navigation files and trackline map been corrected to reflect the offset.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
These data are not to be used for bathymetry or navigation. Two-way travel times (TWT) shown on the printable profile images are relative to the chirp towfish position (below the sea surface), not to the sea surface.
Lineage:
Process_Step:
Process_Description:
Chirp acquisition - Subbottom data were acquired from one survey platform, an Edgetech 424 Portable Subbottom Profiler, which was towed on the port side of the 26-foot research vessel, the R/V Alyce C. 84 lines, equivalent to a total of 110.16 line-kilometers, were surveyed. The seismic source utilized during 2023-310-FA consisted of an EdgeTech 424 towfish running DISCOVER version 4.09 acquisition software and towed on the port side of the vessel, approximately 3 m across-track from the IANS reference point. The data were acquired in J-STAR standard format (JSF) and SEG-Y at 5 hertz (Hz), which equates to 0.20 pings per second. The frequency sweep was 4-20 kilohertz (kHz), pulse lengths ranged between 5 ms and 10 ms, and recording length was approximately 53.2 ms. Based on survey speeds of 3.5-4.5 knots, the shot spacing was roughly 0.450 m. During acquisition, positions from the POS MV IANS were recorded and written to the seismic trace headers in arcseconds every 0.2 s. The binary portion of the seismic data provided in this publication (Forde and others, 2023) is stored in SEG-Y rev. 1, IBM 32-bit float [big-endian byte order] format, which is a standard digital format that can be read and manipulated by most seismic processing software packages; the first 3,200 bytes of the file header are in ASCII format instead of Extended Binary Coded Decimal Interchange Code (EBCDIC) format. The SEG-Y formatted envelope trace files have a .sgy extension and may be downloaded and processed with commercial or public domain software such as Seismic Unix (SU) (Cohen and Stockwell, 2010). The printable profiles (provided in .gif format) are chirp subbottom profile images that were processed using SU software. Survey Field Activity Collection System (FACS) logs, geophysical logs, and acquisition geometry figure are also provided as supplemental information in the download file, 2023-310-FA_logs.zip (Forde and others, 2023).
Process_Date: 20230513
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Emily A. Wei
Contact_Organization: U.S. Geological Survey
Contact_Position: Research Geologist
Contact_Address:
Address_Type: Mailing and physical
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Contact_Voice_Telephone: (727) 502-8000
Contact_Electronic_Mail_Address: ewei@usgs.gov
Process_Step:
Process_Description:
Chirp processing and image creation - The EdgeTech 424 chirp system recorded the subbottom data in JSF and SEG-Y rev. 1 formats. Enveloped SEG-Y trace data were processed with custom scripts and SU Release 44 (Cohen and Stockwell, 2010) software to produce gained Graphics Interchange Format (GIF) images of the subbottom profiles included in Forde and others (2023). A representative chirp data processing sequence consisted of (1) removing raw [vessel] navigation data for each shot and converting the SEG-Y file to SU format, (2) applying automatic gain control, (3) trimming the trace data TWT to 30 ms (no observable features, aside from multiples, were encountered below that point in the profiles), (4) generating a PostScript image of the traces, and (5) converting the PostScript image to a GIF image. The subbottom profile images have tic marks every 200 shots, with labels, larger tic marks, and dashed grid lines every 1000 shots. Not all lines have 1000 shots or more, see the logical consistency report for additional details.
Source_Used_Citation_Abbreviation: *.sgy
Process_Date: 20230807
Source_Produced_Citation_Abbreviation: *.gif
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Arnell S. Forde
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: Mailing and physical
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Contact_Voice_Telephone: (727) 502-8000
Contact_Electronic_Mail_Address: aforde@usgs.gov
Process_Step:
Process_Description:
Navigation acquisition and processing - A Norbit Winghead MBES system with an integrated Applanix Pos MV Wavemaster II V5 IANS with two AeroAntenna Technology (AT16575-540Ts-TNCF-000-RG-45_NM-R) GNSS antennas (positioned forward-aft near the aft-starboard of the vessel) and an associated IMU were used for positioning onboard the R/V Alyce C. Real-time positions from the Applanix system were recorded and written to the seismic trace headers via a RS232 cable running from the Norbit topside unit to the topside unit of the chirp system every 0.20 seconds, with unique navigation fixes being recorded every second. During subbottom processing, location data were extracted from the SEG-Y headers of the processed chirp profiles, using bespoke scripts and Seismic Unix (Cohen and Stockwell, 2010) software and output as ASCII text files; PROJ.5.1.0 (https://proj.org/) software was used to project WGS84 latitude and longitude coordinates to Universal Transverse Mercator (UTM) northings and eastings (WGS84, Zone 4 North [N], meters). Navigation files for each subbottom line, saved by line number, were concatenated into comma-delimited text files so they could be represented geospatially using Esri ArcGIS software. The final output files are as follows: (1) 2023-310-FA_nav.csv contains unique shotpoint positions (along each line) for the entire survey – roughly every 5 shots, (2) 2023-310-FA_1000sht.csv includes the 1,000-shot-interval locations that were generated to correlate shot locations on the trackline map with evenly spaced 1,000-shot index markers along the top of the printable profile images, and (3) 2023-310-FA_sol.csv has the start-of-line locations for each trackline. The concatenated, comma-delimited text files were later imported into ArcMap and saved as either a point or polyline file (in Esri's shapefile format) for use in the map document (.mxd) included in this archive (Forde and others, 2023).
Source_Used_Citation_Abbreviation: *.txt
Process_Date: 20230807
Source_Produced_Citation_Abbreviation: 2023-310-FA_nav.csv
Source_Produced_Citation_Abbreviation: 2023-310-FA_1000sht.csv
Source_Produced_Citation_Abbreviation: 2023-310-FA_sol.csv
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Arnell S. Forde
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: Mailing and physical
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Contact_Voice_Telephone: (727) 502-8000
Contact_Electronic_Mail_Address: aforde@usgs.gov
Process_Step:
Process_Description:
Trackline map creation - 2023-310-FA_location.mxd and associated shapefiles (.shp) were created with Esri ArcMap 10.8.2 software. The survey navigation file, 2023-310-FA_nav.csv, was imported into ArcMap and processed using the ArcScript "Points to Line" to create a polyline shapefile of the cruise tracklines called 2023-310-FA_trkln.shp. The 1,000-shot-interval and start-of-line files, 2023-310-FA_1000sht.csv and 2023-310-FA_sol.csv, were imported into ArcMap and saved as point shapefiles. A non-proprietary version of the location map was created by utilizing the ArcToolbox "Map to KML" tool, which converted each layer included in the map document (.mxd) to keyhole markup language (.kml) format prior to them being compressed (zipped) and saved as a .kmz file. The ArcGIS and Google Earth geospatial files provided in Forde and others (2023) are unprojected (geographic coordinates, WGS84). For detailed information about the GIS files provided in this data release, please refer to the individual metadata records (*_metadata.txt and *.shp.xml) accompanying each shapefile and the readme file included in 2023-310-FA_gis.zip (Forde and others, 2023).
Source_Used_Citation_Abbreviation: 2023-310-FA_nav.csv
Source_Used_Citation_Abbreviation: 2023-310-FA_1000sht.csv
Source_Used_Citation_Abbreviation: 2023-310-FA_sol.csv
Process_Date: 20231010
Source_Produced_Citation_Abbreviation: 2023-310-FA_trkln.shp
Source_Produced_Citation_Abbreviation: 2023-310-FA_shots.shp
Source_Produced_Citation_Abbreviation: 2023-310-FA_sol.shp
Source_Produced_Citation_Abbreviation: 2023-310-FA.kmz
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Arnell S. Forde
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: Mailing and physical
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Contact_Voice_Telephone: (727) 502-8000
Contact_Electronic_Mail_Address: aforde@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.0198168345
Longitude_Resolution: 0.0211353562
Geographic_Coordinate_Units: Decimal Degrees
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:
Detailed_Description:
Entity_Type:
Entity_Type_Label:
2023-310-FA_nav.csv (35071 data records), 2023-310-FA_1000sht.csv (136 data records), 2023-310-FA_sol.csv (81 data records).
Entity_Type_Definition:
These files, which are located in 2023-310-FA_nav.zip (Forde and others, 2023), represent the May 2023 subbottom navigation data. The attributes described below are for the survey's shotpoint navigation file, 2023-310-FA_nav.csv., which contains all the unique shot navigation fixes including the minimum and maximum range of values. 2023-310-FA_1000sht.csv represents the 1000th shot interval and has the same attribute definitions as the shot navigation but different ranges of values not represented here. Not all lines have a record, since some of the data are less than 1000 shots. 2023-310-FA_sol represents the navigation fix for the start of each seismic line and also with the same attribute definition as the survey navigation – but different ranges of values not represented here. For detailed information specific to the ArcGIS data, please see the associated shapefile metadata.
Entity_Type_Definition_Source: U.S. Geological Survey
Attribute:
Attribute_Label: UTMX
Attribute_Definition: UTM-X coordinate (Zone 4N)
Attribute_Definition_Source: Universal Transverse Mercator Coordinate System
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 624877.207
Range_Domain_Maximum: 632135.187
Attribute_Units_of_Measure: meters
Attribute:
Attribute_Label: UTMY
Attribute_Definition: UTM-Y coordinate (Zone 4N)
Attribute_Definition_Source: Universal Transverse Mercator Coordinate System
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2368011.318
Range_Domain_Maximum: 2372055.082
Attribute_Units_of_Measure: meters
Attribute:
Attribute_Label: Line
Attribute_Definition: Trackline name
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain:
Line numbers were assigned by the EdgeTech 424 chirp topside unit during data acquisition and are composed of an alphanumeric identifier and trackline number. The naming convention used for each subbottom line is as follows: xy_line#, where 'x' represents a partial FAN, 'y' denotes the survey area, which is either Marine Corps Base Hawaii (MCBH) or Marine Corps Base Hawaii Coconut Island (MCBH_CI), and 'line#' is the trackline number (for example, 2023_310_MCBH_CI_line01 and 2023_310_MCBH_line01). If recording was prematurely terminated or reran, due to quality or acquisition issues, characters (specifically "a" or "b") or sequentially increasing numbers (such as .001, .002, etc.), were manually appended to the trackline name.
Attribute:
Attribute_Label: Shot
Attribute_Definition: Shotpoint number
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 5997
Attribute:
Attribute_Label: Lon
Attribute_Definition: Longitude (decimal degrees)
Attribute_Definition_Source: World Geodetic System 1984 Geographic Coordinate System
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -157.795000
Range_Domain_Maximum: -157.724867
Attribute_Units_of_Measure: decimal degrees
Attribute:
Attribute_Label: Lat
Attribute_Definition: Latitude (decimal degrees)
Attribute_Definition_Source: World Geodetic System 1984 Geographic Coordinate System
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 21.409567
Range_Domain_Maximum: 21.446094
Attribute_Units_of_Measure: decimal degrees
Attribute:
Attribute_Label: YEAR
Attribute_Definition: Year of data acquisition
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2023
Range_Domain_Maximum: 2023
Attribute:
Attribute_Label: DOY:HR:MIN:SEC
Attribute_Definition: Day of year:hour:minute:second
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain:
Day of year, hour, minute and second of data acquisition, in Coordinated Universal Time (UTC).
Overview_Description:
Entity_and_Attribute_Overview:
Navigation file: Navigation files are available as ASCII delimited text files in comma-separated values file format. The final navigation files are provided in 2023-310-FA_nav.zip (Forde and others, 2023) and represent the reprojected survey shotpoint navigation, 1,000-shot-interval locations, and start of line files.
Entity_and_Attribute_Overview:
Binary data file: Seismic trace data are available as binary files in SEG-Y format (81 files). These files have a .sgy extension and range in size from 1.4 to 57 megabytes. These data are included in the download file, 2023-310-FA_segy.zip (Forde and others, 2023), and can also be found by going to the USGS CMGDS at, https://cmgds.marine.usgs.gov. The SEG-Y rev. 1 format (Norris and others, 2002) data presented here consists of the following: a 3,600-byte reel identification header, with the first 3,200 bytes consisting of an ASCII header block followed by a 400-byte binary header block, both of which include information specific to line and reel number; a trace data block that follows the reel identification header, with the first 240 bytes of each trace block consisting of the binary trace identification header; and seismic data samples that follow the trace identification header.
Entity_and_Attribute_Overview:
Graphic image file: Printable versions of the processed subbottom profiles are available as GIF images (81 files) and are included in the download file, 2023-310-FA_seisimag.zip (Forde and others, 2023).
Entity_and_Attribute_Overview:
GIS file: The GIS data associated with this survey are provided in Forde and others (2023) as a compressed zip file, 2023-310-FA_gis.zip, which is composed of an Esri map document, shapefiles, individual shapefile metadata, a Google Earth Keyhole Markup Language Zipped (KMZ) file, a folder of processed subbottom profile images, and a readme file.
Entity_and_Attribute_Detail_Citation:
The entity and attribute information were generated by the individual and/or agency identified as the originator of the dataset. Please review the rest of the metadata record for additional details and information.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Arnell S. Forde
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: Mailing and physical
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: (727) 502-8000
Contact_Electronic_Mail_Address: aforde@usgs.gov
Contact_Instructions:
The SEG-Y files included in Forde and others (2023) are also downloadable from the Coastal and Marine Geoscience Data System at, https://cmgds.marine.usgs.gov.
Distribution_Liability:
This publication was prepared by an agency of the United States Government. Although these data were processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: SEG-Y
Format_Version_Number: Revision 1
Format_Information_Content: The ZIP file contains the SEG-Y data and support information.
File_Decompression_Technique: Winzip or 7zip
Transfer_Size: 1440
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Comma-delimited ASCII
Format_Information_Content:
The ZIP file contains the survey navigation data and support information.
File_Decompression_Technique: Winzip or 7zip
Transfer_Size: 0.522
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Shapefile, MXD, KMZ, GIF
Format_Information_Content:
The ZIP file contains the survey navigation data represented geospatially as GIS files (shapefile, MXD, and KMZ), a folder of processed subbottom profile images (GIF, accessible via hyperlinks included in the MXD), and supporting information.
File_Decompression_Technique: Winzip or 7zip
Transfer_Size: 20.3
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Digital_Form:
Digital_Transfer_Information:
Format_Name: GIF
Format_Information_Content:
The ZIP file contains images of the processed subbottom profile data and support information.
File_Decompression_Technique: Winzip or 7zip
Transfer_Size: 19.4
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Fees: None
Technical_Prerequisites:
Use of SEG-Y data requires specialized seismic processing software, such as public domain software Seismic Unix (https://github.com/JohnWStockwellJr/SeisUnix).
Metadata_Reference_Information:
Metadata_Date: 20240129
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Arnell S. Forde
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: Mailing and physical
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: (727) 502-8000
Contact_Electronic_Mail_Address: aforde@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

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