Archive of Chirp Subbottom Profile, Imagery, and Geospatial Data Collected in 2022 from Boca Chica Key, Florida

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Arnell S. Forde
Publication_Date: 20231116
Title:
Archive of Chirp Subbottom Profile, Imagery, and Geospatial Data Collected in 2022 from Boca Chica Key, Florida
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: 20231116
Title:
Archive of Chirp Subbottom Profile Data Collected in 2022 From Boca Chica Key, Florida
Series_Information:
Series_Name: U.S. Geological Survey data release
Issue_Identification: doi:10.5066/P95M6VHT
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/P95M6VHT
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 at the nearshore ledge offshore of Boca Chica Key, Florida (FL) November 8-13, 2022. The objective of the project was to collect bathymetric maps and conduct a geologic assessment of the nearshore ledge off Boca Chica Key in support of efforts to construct an artificial coral reef offshore of Naval Air Station Key West. 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 0 format (Barry and others, 1975). 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 2022-334-FA. Additional survey and data details are available from the USGS CMGDS at, https://cmgds.marine.usgs.gov/fan_info.php?fan=2022-334-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: 20221108
Ending_Date: 20221113
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -81.711944
East_Bounding_Coordinate: -81.633078
North_Bounding_Coordinate: 24.566469
South_Bounding_Coordinate: 24.485017
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:cae88aaf-cb11-4a8d-a593-8b0184b2f0e8
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: 2022-334-FA
Place:
Place_Keyword_Thesaurus: Common Geographic Areas
Place_Keyword: Florida
Place_Keyword: Boca Chica Key
Place_Keyword: Florida Bay-Florida Keys
Place_Keyword: South Atlantic
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 Andrew Farmer of the SPCMSC for his assistance in data collection and piloting the Research Vessel (R/V) Sallenger. This document was improved by scientific/editorial and metadata reviews from Nicholas Ferina and Tess Rivenbark-Terrano of the Bureau of Ocean Energy Management and St. Petersburg Coastal and Marine Science Center.
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; Seismic Unix (Release 44).
Cross_Reference:
Citation_Information:
Originator: Barry, K.M.
Originator: Cavers, D.A.
Originator: Kneale, C.W.
Publication_Date: 1975
Title: Recommended standards for digital tape formats
Series_Information:
Series_Name: Geophysics
Issue_Identification: v. 40, no. 2
Other_Citation_Details: pages 344-352
Online_Linkage: https://doi.org/10.1190/1.1440530
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
Cross_Reference:
Citation_Information:
Originator: Stalk, C.A.
Originator: Wei, E.A.
Originator: Farmer, A.S.
Originator: Hatcher, G.A.
Originator: Kranenburg, C.J.
Publication_Date: 20231116
Title:
High-resolution geophysical and imagery data collected in November 2022 offshore of Boca Chica Key, FL
Series_Information:
Series_Name: U.S. Geological Survey data release
Issue_Identification: doi:10.5066/P9KNCMFY
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/P9KNCMFY
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.
Completeness_Report:
A total of 53 seismic lines were collected during this field activity. Due to an equipment issue, navigation data were not recorded to the seismic headers during the acquisition of line 2022_334_FA_315_031; consequently, this line has been excluded from Forde and others (2023).
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), which is accurate to within 0.5-2 meters (m). To ensure consistent spacing between survey lines acquired aboard the R/V Sallenger, 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 seismic trace headers in arcseconds every 0.2 seconds and were subsequently converted to 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. For additional positional accuracy and navigation details specific to the bathymetry data, please refer to the metadata included in Stalk and others (2023).
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 3400 Portable Subbottom Profiler, which was towed by the 26-foot research vessel, the R/V Sallenger. 53 lines, equivalent to a total of 108.95 line-kilometers, were surveyed. The seismic source utilized during 2022-334-FA consisted of an EdgeTech 3400 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 at 5 hertz (Hz), which equates to a 0.20 s sample interval, using a frequency sweep of 3-16 kilohertz (kHz), and recording length was approximately 39.9 ms. Based on survey speeds of 3.5-4.5 knots, the shot spacing was approximately 0.450 m. The binary portion of the seismic data provided in Forde and others (2023) is stored in SEG-Y rev. 0, 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 American Standard Code for Information Interchange (ASCII) format instead of Extended Binary Coded Decimal Interchange Code (EBCDIC) format. The SEG-Y formatted 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 are chirp subbottom profile images that were processed using SU software. Survey Field Activity Collection System (FACS) logs, geophysical logs, and acquisition geometry are also provided as supplemental information in the download file, 2022-334-FA_logs.zip (Forde and others, 2023).
Process_Date: 20220429
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 - The SEG-Y data were processed with Seismic Unix (Release 44) software to produce gained Graphics Interchange Format (GIF) images of the subbottom profiles included in this data release. A representative chirp data processing sequence consisted of (1) creating the envelope seismic data file from the analytic data (corrected files included in this publication have "_env" appended to the line name), (2) removing raw [vessel] navigation data for each shot and converting the SEG-Y file to SU format, (3) applying automatic gain control, (4) trimming the trace data TWT to 30 ms (no observable features, aside from multiples, were encountered below that point in the profiles), (5) generating a PostScript image of the traces, and (6) converting the PostScript image to a GIF image.
Source_Used_Citation_Abbreviation: *.sgy
Process_Date: 20220929
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:
Supplementary acquisition and processing information for the navigation data and global navigation satellite system (GNSS) data are included in Stalk and others (2023).
Process_Date: 2022
Process_Step:
Process_Description:
Navigation acquisition and processing - An Applanix Pos MV Wavemaster II V5 IANS with two GA830 GNSS antennas (positioned amidships) and an associated IMU was used for positioning onboard the R/V Sallenger. Real-time positions from the Applanix system were recorded and written to the seismic trace headers via a RS232 cable running from the Applanix receiver to the topside unit of the chirp system every 0.20 seconds. During subbottom processing, location data were extracted from the SEG-Y headers of the processed chirp profiles, using 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 17 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) 2022-334-FA_nav.csv contains unique shotpoint positions (along each line) for the entire survey, (2) 2022-334-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) 2022-334-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: *_env.txt
Process_Date: 20220929
Source_Produced_Citation_Abbreviation: 2022-334-FA_nav.csv
Source_Produced_Citation_Abbreviation: 2022-334-FA_1000sht.csv
Source_Produced_Citation_Abbreviation: 2022-334-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 - 2022-334-FA_location.mxd and associated shapefiles (.shp) were created with Esri ArcMap 10.8.2 software. The survey navigation file, 2022-334-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 2022-334-FA_trkln.shp. The 1,000-shot-interval and start-of-line files, 2022-334-FA_1000sht.csv and 2022-334-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 2022-334-FA_gis.zip (Forde and others, 2023).
Source_Used_Citation_Abbreviation: 2022-334-FA_nav.csv
Source_Used_Citation_Abbreviation: 2022-334-FA_1000sht.csv
Source_Used_Citation_Abbreviation: 2022-334-FA_sol.csv
Process_Date: 20230405
Source_Produced_Citation_Abbreviation: 2022-334-FA_trkln.shp
Source_Produced_Citation_Abbreviation: 2022-334-FA_shots.shp
Source_Produced_Citation_Abbreviation: 2022-334-FA_sol.shp
Source_Produced_Citation_Abbreviation: 2022-334-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: 0.0198074602
Longitude_Resolution: 0.0216287693
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:
2022-334-FA_nav.csv (60294 data records), 2022-334-FA_1000sht.csv (278 data records), 2022-334-FA_sol.csv (52 data records).
Entity_Type_Definition:
These files, which are located in 2022-334-FA_nav.zip (Forde and others, 2023), represent the April–May 2022 subbottom navigation data. The attributes described below are for the survey's shotpoint navigation file, 2022-334-FA_nav.csv. 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 17N)
Attribute_Definition_Source: Universal Transverse Mercator Coordinate System
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 427894.353
Range_Domain_Maximum: 435864.055
Attribute_Units_of_Measure: meters
Attribute:
Attribute_Label: UTMY
Attribute_Definition: UTM-Y coordinate (Zone 17N)
Attribute_Definition_Source: Universal Transverse Mercator Coordinate System
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2708111.891
Range_Domain_Maximum: 2717095.516
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 3400 chirp topside unit during data acquisition and are composed of the FAN, Day of Year (DOY), and trackline number. The naming convention used for each subbottom line is as follows: x_env, where 'x' is an alphanumeric number indicating a specific trackline (for example, 2022_334_FA_312_001) and 'env' denotes that the seismic traces were output as an envelope.
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: 22977
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: -81.711944
Range_Domain_Maximum: -81.633078
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: 24.485017
Range_Domain_Maximum: 24.566469
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: 2022
Range_Domain_Maximum: 2022
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 2022-334-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 (52 files). These files have a .sgy extension and range in size from 1.8 to 70.8 megabytes. These data are included in the download file, 2022-334-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. 0 format (Barry and others, 1975) 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 (52 files) and are included in the download file, 2022-334-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, 2022-334-FA_gis.zip, which is composed of an Esri map document, shapefiles, individual shapefile metadata, a Google Earth 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 0
Format_Information_Content: The ZIP file contains the SEG-Y data and support information.
File_Decompression_Technique: Winzip or 7zip
Transfer_Size: 2010
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: 0.929
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: 33.5
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: 32.5
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: 20231025
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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