PNG formatted images of EdgeTech SB-424 seismic-reflection profiles collected by the U.S. Geological Survey -Woods Hole Coastal and Marine Science Center offshore of the Elizabeth Islands, MA, 2010.

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 2012
Title:
PNG formatted images of EdgeTech SB-424 seismic-reflection profiles collected by the U.S. Geological Survey -Woods Hole Coastal and Marine Science Center offshore of the Elizabeth Islands, MA, 2010.
Edition: 1.0
Geospatial_Data_Presentation_Form: remote-sensing image
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2011-1184
Publication_Information:
Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Online_Linkage:
<https://pubs.usgs.gov/of/2011/1184/GIS_catalog/seisimage/2010-003-FA_seisimage.zip>
Larger_Work_Citation:
Citation_Information:
Originator: Elizabeth A. Pendleton
Originator: David C. Twichell
Originator: David S. Foster
Originator: Charles R. Worley
Originator: Barry J. Irwin
Originator: William W. Danforth
Publication_Date: 2012
Title:
High-Resolution Geophysical Data From the Sea Floor Surrounding the Western Elizabeth Islands, Massachusetts
Edition: 1.0
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2011-1184
Publication_Information:
Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Online_Linkage: <https://pubs.usgs.gov/of/2011/1184/>
Description:
Abstract:
These data were collected under a cooperative agreement between the Massachusetts Office of Coastal Zone Management (CZM) and the U.S. Geological Survey (USGS), Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center (WHCMSC). Initiated in 2003, the primary objective of this program is to develop regional geologic framework information for the management of coastal and marine resources. Accurate data and maps of seafloor geology are important first steps toward protecting fish habitat, delineating marine resources, and assessing environmental changes due to natural or human impacts. The project is focused on the inshore waters of coastal Massachusetts, primarily in water depths of 2-30 meters. Data collected for the mapping cooperative have been released in a series of USGS Open-File Reports (<http://woodshole.er.usgs.gov/project-pages/coastal_mass/html/current_map.html>). The data collected in this study area located around the western extent of the Elizabeth Islands includes high resolution bathymetry, acoustic-backscatter intensity, seismic-reflection, and navigation data. These data were collected during a nearshore cruise in September 2010 onboard the R/V Rafael using the following equipment: an SEA Ltd SwathPlus interferometric sonar (234 kHz), Klein 3000 dual frequency sidescan sonar, an Edgetech 424 chirp subbottom profiling system, and 4 GPS antennae. More information about the cruise conducted as part of the project: Geologic Mapping of the Seafloor Offshore of Massachusetts can be found on the Woods Hole Coastal and Marine Science Center Field Activity webpage: <http://quashnet.er.usgs.gov/data/2010/10003/>
Purpose:
PNG images of each seismic profile were generated in order to incorporate images of the seismic data into Geographic Information System (GIS) projects and data archives utilizing HTML. These PNG images represent approximately 253 km of chirp seismic data collected with the EdgeTech 424 in Sept. 2010. This format is universal and yields an easily browseable pictorial view of the seismic profiles. Each profile image is hotlinked to its corresponding trackline navigation contained within a polyline shapefile ('2010-003-FA_Chirp424_tracklines.shp'), and even 500 shot-point locations are available in a point shapefile ('2010-003-FA_Chirp424_500sht.shp). All of these data are available in an ESRI ArcMap project, as well as separate .zip archives on this digital data DVD archive (<https://pubs.usgs.gov/of/2011/1184/GIS_catalog/>).
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20100910
Ending_Date: 20100916
Currentness_Reference: Data were not collected on 20100915 due to weather conditions.
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -70.992374
East_Bounding_Coordinate: -70.849060
North_Bounding_Coordinate: 41.460852
South_Bounding_Coordinate: 41.388525
Keywords:
Theme:
Theme_Keyword_Thesaurus: General
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 Geology Program
Theme_Keyword: CMGP
Theme_Keyword: PNG
Theme_Keyword: seismic-reflection
Theme_Keyword: SEGY
Theme_Keyword: profiles
Theme_Keyword: seismic
Theme_Keyword: subbottom
Theme_Keyword: image
Theme_Keyword: chirp
Theme_Keyword: EdgeTech
Theme_Keyword: SB-424
Theme_Keyword: WHCMSC field activity serial number 2010-003-FA
Theme_Keyword: R/V Rafael
Theme_Keyword: Edgetech SB-424
Theme_Keyword: Info Bank ID R-3-10-BZ
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation
Theme_Keyword: oceans
Theme_Keyword: oceans and coastal
Theme_Keyword: oceans and estuaries
Theme_Keyword: imageryBaseMapsEarthCover
Place:
Place_Keyword_Thesaurus: General
Place_Keyword: North America
Place_Keyword: Atlantic Ocean
Place_Keyword: Massachusetts
Place_Keyword: Cuttyhunk Island
Place_Keyword: Nashawena Island
Place_Keyword: Elizabeth Islands
Place_Keyword: Buzzards Bay
Place_Keyword: Vineyard Sound
Place_Keyword: Quicks Hole
Place_Keyword: Cuttyhunk Harbor
Place_Keyword: Sow and Pigs Reef
Place_Keyword: Penikese Island
Place_Keyword: Gull Island
Place_Keyword: United States
Access_Constraints: None
Use_Constraints:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: David C. Twichell
Contact_Organization: U.S. Geological Survey
Contact_Position: Oceanographer
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2266
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: dtwichell@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name:
<https://pubs.usgs.gov/of/2011/1184/GIS_catalog/seisimage/seisimage.png>
Browse_Graphic_File_Description: PNG image of SB-424 chirp seismic reflection profile
Browse_Graphic_File_Type: PNG
Native_Data_Set_Environment:
Microsoft Windows 7 Enterprise Service Pack 1; ArcGIS Desktop 9.3 Service Pack 1; Build 1850
Cross_Reference:
Citation_Information:
Originator: John Stockwell
Publication_Date: 2008
Title: CWP/SU: Seismic Uni*x
Geospatial_Data_Presentation_Form: document
Publication_Information:
Publication_Place: Golden, CO
Publisher: Center for Wave Phenomena - Colorado School of Mines
Online_Linkage: <http://www.cwp.mines.edu/cwpcodes/>
Cross_Reference:
Citation_Information:
Originator: Paul Henkart
Publication_Date: 2007
Title: SIOSEIS
Geospatial_Data_Presentation_Form: document
Publication_Information:
Publication_Place: LaJolla, CA
Publisher:
Scripps Institution of Oceanography, University of California - San Diego
Online_Linkage: <http://sioseis.ucsd.edu/>
Cross_Reference:
Citation_Information:
Originator: Michael W. Norris
Originator: Alan K. Faichney
Publication_Date: 2002
Title: SEGY Rev.1 Data Exchange Format1
Geospatial_Data_Presentation_Form: document
Publication_Information:
Publication_Place: Tulsa, OK
Publisher: Society of Exploration Geophysicists
Online_Linkage: <http://www.seg.org/documents/10161/77915/seg_y_rev1.pdf>
Data_Quality_Information:
Logical_Consistency_Report:
Processed seismic data were converted to portable network graphic (PNG) format for ease of seismic trace display. Quality control was conducted during processing. File naming is generally lxfy.png. Where x is the survey line number and y is the file number along a given survey line. There are a few exceptions that resulted from autofile changing in SonarWiz.MAP +SBP. A few lines are named lxfy_.png, and a few others are lxfy_00z.png; where x and y are the same as above and z is the autofile change number.
Completeness_Report:
l8f3 and l26f1.001 had fewer than 50 shot points, so these lines were not included.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The SB-424 was towed from a starboard-side davit with 2-m of cable out on the R/V Rafael. The navigation for these data were acquired with an Communications Systems International (CSI), Inc. LGBX Pro Differential Global Positioning System (DGPS) receiver and an antenna mounted on the cabin of the R/V Rafael. All DGPS data are referenced to WGS84. The SonarWiz.MAP +SBP acquisition software logged the navigation coordinates (in arcseconds) to individual trace headers, but towfish layback and horizontal distance between the CSI antenna and the towfish was not accounted for. Based on horizontal offsets between the towfish and GPS receiver, and towfish motion behind the vessel, the resulting horizontal accuracy is assumed to be +/- 25 m.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20100910
Ending_Date: 20100916
Source_Currentness_Reference: Data were not collected on 20100915 due to weather conditions.
Source_Contribution:
Approximately 253 km of high-resolution chirp seismic-reflection profiles were collected using an EdgeTech 3100 portable sub-bottom system and SB-424 towfish (4-24 kHz) on the R/V Rafael of Woods Hole, MA. SonarWiz.MAP +SBP (version 4) acquisition software was used to control the Geo-Star topside unit and digitally log trace data in the Society of Exploration Geophysicists Y (SEG-Y), revision 1, standard format (Norris and Faichney, 2002). The SB-424 towfish was towed astern of the starboard side of the vessel. Navigation coordinates were obtained from a DGPS antenna mounted 3-m above the waterline on the interferometric sonar pole and logged to the SEG-Y trace headers. Data were acquired using a 4.0 to 24.0 kHz frequency sweep, a 10 millisecond pulse length, a 0.1667 second shot rate, a 23 microsecond sample interval, and a 130 millisecond record length. A total of 253 km of seismic data were collected.
Process_Step:
Process_Description:
An executable C-shell script called on SIOSEIS (version 10.2.25) to: 1) read the raw SEG-Y data so that shot number begins at one and increments by one for each SEG-Y file; 2) apply a time varying gain: a(i) = a(i) * (t*1000.)**alpha where a(i) is the trace and t is the time of the trace sample in seconds (alpha was 1.5).; 3) apply Automatic Gain Control (AGC) to every trace. AGC is a type of amplitude normalization (modification) that results in the amplitudes being more uniform, especially when the window length decreases. AGC starts by finding the first non-zero sample and then calculates the average absolute value of the window. Successive windows are calculated by shifting the window down one sample. Each average absolute value is then turned into a multiplier by dividing the average by an output level. A window length of 10 ms was used and 65 percent of the computed multiplier was applied.; and, 4) write the gained traces to new SEG-Y files.
Process_Date: 20101030
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: David S. Foster
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 x2271
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: dfoster@usgs.gov
Process_Step:
Process_Description:
A Seismic Unix (version 4.1) script was used to read the gained SEG-Y files and plot the data as 8-bit gray scale Postscript files using the Seismic Unix 'psimage' algorithm. All images were created with a horizontal scale of 100 traces per inch. Images were plotted within a constant 14-inch vertical window of 60 milliseconds (Two-Way Travel Time) duration, yielding a vertical resolution of about 5 milliseconds per inch. The Postscript images were then converted with ImageMagick to PNG format for visualization in an image viewer.
Process_Date: 201010
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: David S. Foster
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
Contact_Voice_Telephone: (508) 548-8700x2271
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: dfoster@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: pixel
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Elizabeth Pendleton
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
Contact_Voice_Telephone: (508) 548-8700x2259
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: ependleton@usgs.gov
Resource_Description: Downloadable Data
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 USGS 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: WinZip
Format_Version_Number: 14.5
Format_Information_Content:
WinZip files contains compressed images of processed seismic-reflection profiles as well as associated metadata.
File_Decompression_Technique: Use WinZip or pkUnzip
Transfer_Size: 316 MB
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
<https://pubs.usgs.gov/of/2011/1184/GIS_catalog/seisimage/2010-003-FA_seisimage.zip>
Network_Resource_Name: <https://pubs.usgs.gov/of/2011/1184/html/GIS_catalog.html>
Access_Instructions: Data can be downloaded via the World Wide Web (WWW)
Offline_Option:
Offline_Media: DVD-ROM
Recording_Capacity:
Recording_Density: 4.75
Recording_Density_Units: Gbytes
Recording_Format: UDF
Fees: none
Custom_Order_Process:
Digital copies of these chirp seismic data may also be obtained in the SEG-Y Rev. 1 standard format upon request. The data would be packaged on DVD, and contain the chirp-processed, envelope traces.
Technical_Prerequisites: These data can be viewed with any PNG image viewing software.
Metadata_Reference_Information:
Metadata_Date: 201010
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Elizabeth Pendleton
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
Contact_Voice_Telephone: (508) 548-8700x2259
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: ependleton@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Access_Constraints: None
Metadata_Use_Constraints: None
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Generated by mp version 2.8.25 on Fri Nov 18 14:46:50 2011