U.S. Geological Survey
2009
Tracklines of chirp seismic-reflection data collected by the U.S. Geological Survey offshore of the Chandeleur Islands, LA, 2006 (seismic_trk_06015.shp, polylines)
1.0
vector digital data
Open-File Report
2008-1195
Woods Hole Coastal and Marine Science Center, Woods Hole, MA
U.S. Geological Survey, Coastal and Marine Geology Program
https://doi.org/10.3133/ofr20081195
http://pubs.usgs.gov/of/2008/1195/GIS_catalog/Tracklines/seismic_trk_06015.zip
Wayne E. Baldwin
Elizabeth A. Pendleton
David C. Twichell
2009
Geophysical Data from offshore of the Chandeleur Islands, Eastern Mississippi Delta
1.0
Open-File Report
2008-1195
Reston, VA
U.S. Geological Survey
http://pubs.usgs.gov/of/2008/1195/
In 2006 and 2007, the U.S. Geological Survey, in partnership with Louisiana Department of Natural Resources and the University of New Orleans, conducted geologic mapping to characterize the sea floor and shallow subsurface stratigraphy offshore of the Chandeleur Islands in Eastern Louisiana. The mapping was carried out during two cruises on the R/V Acadiana. Data were acquired with the following equipment: an SEA Ltd SwathPlus interferometric sonar (234 kHz), Klein 3000 dual frequency sidescan sonar, and an Edgetech 512i chirp subbottom profiling system. The long-term goal of this mapping effort is to produce high-quality geologic maps and geophysical interpretations that can be utilized to investigate the impact of Hurricane Katrina in 2005 and to identify sand resources within the region.
This data set contains trackline navigation for approximately 1900 km of EdgeTech 512i chirp seismic-reflection data collected by the U.S. Geological Survey during a 2006 geophysical cruise offshore of the Chandeleur Islands, LA.
20060708
20060719
ground condition
None planned
-88.899570
-88.751057
30.118149
29.704002
USGS Metadata Identifier
USGS:c0de6eca-f92b-477e-94b9-c1171b6a45da
None
U.S. Geological Survey
USGS
Woods Hole Science Center
WHSC
Coastal and Marine Geology Program
CMGP
navigation
tracks
tracklines
Marine Geology
seismic profile
seismic reflection
seismic stratigraphy
chirp
EdgeTech
512i
ESRI polyline shapefile
WHSC field activity serial number 06015
ISO 19115 Topic Category
oceans
location
geoscientificInformation
USGS Thesaurus
navigational data
marine geophysics
geospatial datasets
None
Louisiana
Chandeleur Islands
North Central Gulf Coast
United States
Gulf of Mexico
Breton Island
Gosier Island
Curlew Island
MRGO
New Harbor Islands
North Islands
Mississippi River Gulf Outlet
None
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.
David C. Twichell
U.S. Geological Survey
Oceanographer
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700x2266
(508) 457-2310
dtwichell@usgs.gov
http://pubs.usgs.gov/of/2008/1195/images/chirp_trk.jpg
EdgeTech 512i seismic trackline navigation offshore of the Chandeleur Isands, LA
JPEG
Microsoft Windows XP Professional x64 Edition Version 2003 Service Pack 2; ESRI ArcCatalog 9.2.4.1420
John Stockwell
2008
CWP/SU: Seismic Uni*x
document
Golden, CO
Center for Wave Phenomena - Colorado School of Mines
http://www.cwp.mines.edu/cwpcodes/index.html
Paul Henkart
2007
SIOSEIS
document
LaJolla, CA
Scripps Institution of Oceanography, University of California - San Diego
http://sioseis.ucsd.edu/index.html
Michael W. Norris and Alan K. Faichney
2002
SEGY Rev.1 Data Exchange Format1
document
Tulsa, OK
Society of Exploration Geophysicists
http://www.seg.org/documents/10161/77915/seg_y_rev1.pdf
All attributes were checked in a consistent manner.
Any spurious data points were removed during processing.
All navigation from seismic-reflection data collected during cruise ACAD06015 was used to generate this shapefile.
The SB-0512i was towed approximately 6 m astern and approximately 1.5 m below the sea surface. DGPS navigation (assumed to be accurate within 1-2 m) was obtained from the receiver mounted above the interferometric sonar head, but towfish layback was not accounted for. The layback of the towfish adds additional uncertainty due to changes in angle and scope of the tow cable in response to sea state and vessel speed. Based on horizontal offsets between the fish and GPS receiver, and fish motion behind the vessel, the resulting positional accuracy is assumed to be +/- 20 m.
U.S. Geological Survey
Unpublished material
Seismic data collection
disc
20060708
20060719
ground condition
raw seismic data
Trackline acquisition at sea (2006):
Chirp seismic data were collected using an EdgeTech Geo-Star FSSB sub-bottom profiling system and an SB-0512i towfish (0.5-12 kHz) on the R/V Acadiana of Loreauville, LA. SB-Logger acquisition software (Triton Imaging Inc. http://www.tritonimaginginc.com/site/content/products/sblogger/index.htm) was used to control the Geo-Star topside unit and digitally log trace data in the SEG-Y rev. 1 standard format. Data were acquired using a 0.25-s fire rate, a 20-ms pulse length, and a 0.7 to 12 kHz sweep (swept frequency). Tracklines are spaced 100 to 125 m apart in the shore parallel direction and about 1 km apart in the shore perpendicular direction.
A script was run that used SIOSEIS (version 96.4) to strip the single, chirp-processed, envelope trace from the three trace SEG-Y file (real, imaginary, and envelope) recorded by SB-Logger (no version). A new file containing only the envelope trace was saved.
2006
Wayne E. Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700x2226
(508) 457-2310
wbaldwin@usgs.gov
A script was run that used Seismic Unix (version 4.1) to read the SEG-Y files, write a Seismic Unix file, and extract SEG-Y trace header information, which included shot number, longitude, latitude, year, day, and time of day. Geographic coordinates were converted to UTM zone 16 coordinates using PROJ (version 4.6.0). Before saving the header information to a text file, the data were filtered using AWK (no version) to save only unique shot point locations. In addition, a separate text file containing even 500 shot intervals was saved. The 500 shot text file maintains the start and end shots, which may not necessarily by unique fixes. A 500 shot interval was chosen because it corresponds to the annotaion interval provided along the top of the seismic-reflection profile JPEG images, which are included in the "Seisimage" folder of the "GIS_Catalog".
2006
Wayne E. Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700x2226
(508) 457-2310
wbaldwin@usgs.gov
Text files for each seismic line were concatenated into two comma-delimited text files, one containing unique shot point positions ('seismic_shtunique_06015.csv', which is provided in the zip-compressed package of the shapefile 'seismic_sht_06015.shp'), and another containing the 500 shot intervals.
2006
Wayne E. Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700x2226
(508) 457-2310
wbaldwin@usgs.gov
Both concatenated, comma-delimited text files were imported into ArcMap (version 9.2) and saved as points in the ESRI shapefile format.
2006
Wayne E. Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700x2226
(508) 457-2310
wbaldwin@usgs.gov
The point shapefile containing unique shot point positions was used as an input for VACExtras (version 1.97), a VB collection of tools developed by VeeAnn Cross (USGS-WHSC), which converts point data to a new polyline shapefile, based on the order of records contained within one attribute field. The shot number field was used to define the point order. The length of each line segment was calculated and inluded in a new attribute field using Xtools Pro for ArcGIS desktop (version 4.1.0), specifying UTM Zone 16 N - kilometers.
2007
Wayne E. Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700x2226
(508) 457-2310
wbaldwin@usgs.gov
Edits to the metadata were made to fix any errors that MP v 2.9.34 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). The source information was incomplete and had to be modified to meet the standard. Formatting of the cross-references was fixed to meet the metadata standard. Minor fixes to the attribute format for some attributes were needed. The distribution format name was modified in an attempt to be more consistent with other metadata files of the same data format. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent.
20161103
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
USGS Thesaurus keywords added to the keyword section.
20180720
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Crossref DOI link was added as the first link in the metadata.
20191118
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Added keywords section with USGS persistent identifier as theme keyword.
20200908
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Vector
String
492
0.000001
0.000001
Decimal degrees
D_WGS_1984
WGS_1984
6378137.000000
298.257224
seismic_trk_06015
ESRI polyline shapefile
ESRI
FID
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
Shape
Feature geometry.
ESRI
Coordinates defining the features.
FILENAME
Name of the seismic line file
U.S. Geological Survey
Information unavailable from original metadata.
IMAGENAME
Name of the seismic profile image (includes location on DVD for hyperlinking)
U.S. Geological Survey
Information unavailable from original metadata.
LineNum
Number of the planned seismic line
U.S. Geological Survey
Information unavailable from original metadata.
YEAR
Calendar Year of data collection.
U.S. Geological Survey
Information unavailable from original metadata.
JULDAY
Julian day data were collected
U.S. Geological Survey
Information unavailable from original metadata.
CruiseID
Unique USGS Woods Hole Science Center field activity code
U.S. Geological Survey
Information unavailable from original metadata.
Length_km
Length of seismic profile in kilometers (UTM Zone 16N)
U.S. Geological Survey
Information unavailable from original metadata.
Wayne E. Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700x2226
(508) 457-2310
wbaldwin@usgs.gov
Downloadable Data
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.
Shapefile
ArcGIS 9.2
This WinZip (version 9.0) file contains a shapefile of 512i seismic-reflection profile trackline navigation collected during cruise ACAD06015 offshore of the Chandeleur Islands, LA, and the associated metadata.
Use WinZip or pkUnzip
7
http://pubs.usgs.gov/of/2008/1195/GIS_catalog/Tracklines/seismic_trk_06015.zip
Data can be downloaded via the World Wide Web (WWW)
DVD-ROM
4.75
Gbytes
UDF
None
This zip file contains data available in Environmental Systems Research Institute (ESRI) point shapefile format. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing the data. A free data viewer, ArcExplorer, capable of displaying the data is available from ESRI at www.esri.com.
20240318
Wayne E. Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700x2226
(508) 457-2310
whsc_data_contact@usgs.gov
The metadata contact email address is a generic address in the event the person is no longer with USGS. (updated on 20240318)
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
None
None