U.S. Geological Survey
2010
Survey lines along which EdgeTech SB-512i and SB-424 chirp seismic-reflection data were collected by the U.S. Geological Survey offshore of Massachusetts between Duxbury and Hull (DH_SeismicTrackline shapefile, Geographic, WGS84)
1.0
vector digital data
Open-File Report
2009-1072
Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts
U.S. Geological Survey, Coastal and Marine Geology Program
https://doi.org/10.3133/ofr20091072
http://pubs.usgs.gov/of/2009/1072/GIS/shapefile/DH_SeismicTrackline.zip
http://pubs.usgs.gov/of/2009/1072/html/appendix1.html
Walter A. Barnhardt
Seth D. Ackerman
Brian D. Andrews
Wayne E. Baldwin
2010
Geophysical and Sampling Data from the Inner Continental Shelf: Duxbury to Hull, Massachusetts.
1.0
Open-File Report
2009-1072
Reston, VA
U.S. Geological Survey
http://pubs.usgs.gov/of/2009/1072/
These data were collected under a cooperative agreement with the Massachusetts Office of Coastal Zone Management (CZM) and the U.S. Geological Survey (USGS), Coastal and Marine Geology Program, Woods Hole Science Center (WHSC). 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 sea-floor 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 (5-30 m deep) of Massachusetts between the New Hampshire border and Cape Cod Bay. 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). This spatial dataset is from the study area located between Duxbury and Hull Massachusetts, and consists of high-resolution geophysics (bathymetry, backscatter intensity, and seismic reflection) and ground validation (sediment samples, video tracklines and bottom photographs). The data were collected during four separate surveys conducted between 2003 and 2007 (NOAA survey H10993 in 2003, USGS-WHSC survey 06012 in 2006, and USGS-WHSC surveys 07001 and 07003 in 2007) and cover more than 200 square kilometers of the inner continental shelf.
This dataset contains trackline navigation for approximately 1920 km of EdgeTech SB-512i and SB-424 chirp seismic-reflection data collected by the U.S. Geological Survey during two Woods Hole Science Center cruises (06012 and 07001) offshore of Massachusetts between Duxbury and Hull.
20060804
20070502
ground condition of two different date ranges: 20060804 to 20060820 and 20070422 to 20070502
None planned
-70.828283
-70.595687
42.339977
42.080213
USGS Metadata Identifier
USGS:7d09df56-5ef7-4197-bba5-141b52aa3df4
None
U.S. Geological Survey
USGS
Coastal and Marine Geology Program
CMGP
Woods Hole Science Center
WHSC
Seafloor
Marine Geology
WHSC field activity serial number 06012
WHSC field activity serial number 07001
seismic profile
navigation tracklines
seismic navigation
seismic reflection
chirp
EdgeTech
512i
424
R/V Megan T. Miller
R/V Rafael
ISO 19115 Topic Category
oceans
location
USGS Thesaurus
navigational data
marine geophysics
geospatial datasets
None
North America
United States
Atlantic Ocean
Massachusetts
Boston South Shore
Massachusetts Bay
Cape Cod Bay
Nantasket Beach
Hull Bay
Scituate
Marshfield
Brant Rock
Duxbury Beach
Duxbury Bay
None
Seafloor
Subsurface
sea floor
None
2006
2007
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 source of this information.
Wayne Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
USA
508-548-8700 x2226
508-457-2310
wbaldwin@usgs.gov
http://pubs.usgs.gov/of/2009/1072/GIS/browse_jpg/big/DH_SeismicTrackline.jpg
EdgeTech 512i and 424 trackline navigation offshore of Massachusetts between Duxbury and Hull
JPEG
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.1850
John Stockwell
2008
CWP/SU: Seismic Uni*x
Golden, CO
Center for Wave Phenomena - Colorado School of Mines
http://www.cwp.mines.edu/cwpcodes/index.html
Paul Henkart
2007
SIOSEIS
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
Tulsa, OK
Society of Exploration Geophysicists
http://www.seg.org/SEGportalWEBproject/prod/SEG-Publications/Pub-Technical-Standards/Documents/seg_y_rev1.pdf
Walter A. Barnhardt
Brian D. Andrews
Bradford Butman
2006
High-Resolution Mapping of the Inner Continental Shelf: Nahant to Gloucester, Massachusetts
Open-File Report
2005-1293
Reston, VA
U.S. Geological Survey
http://pubs.usgs.gov/of/2005/1293/
Seth D. Ackerman
Bradford Butman
Walter A. Barnhardt
William W. Danforth
James M. Crocker
2006
High-Resolution Geologic Mapping of the Inner Continental Shelf: Boston Harbor and Approaches, Massachusetts
Open-File Report
2006-1008
Reston, VA
U.S. Geological Survey
http://pubs.usgs.gov/of/2006/1008/
Walter A. Barnhardt
Brian D. Andrews
Seth D. Ackerman
Wayne E. Baldwin
Christopher J. Hein
2009
High-Resolution Geological Mapping of the Inner Continental Shelf: Cape Ann to Salisbury Beach, Massachusetts
Open-File Report
2007-1373
Reston, VA
U.S. Geological Survey
http://pubs.usgs.gov/of/2007/1373/
All attributes were checked in a consistent manner.
Any spurious data points were removed during processing. For each seismic trackline there is one seismic-profile image that is hyperlinked by the field 'IMAGENAME'. No duplicates exist.
Sections of tracklines where navigation was recorded but no seismic data were logged are not included. Only the subsets of seismic-reflection data collected during field activities 06012 and 07001 that are within the study area between Duxbury and Hull have been included in this spatial dataset. Trackline navigation for approximately 945 km of additional seismic-reflection profiles collected south of Brant Rock, Massachusetts during these field activities will be published in a subsequent data release focused on Cape Cod Bay.
Field activity 06012: The SB-0512i was mounted on a catamaran sled and towed at the sea surface approximately 30 - 40 m astern of the R/V Megan T. Miller. Position data were provided by a Global Positioning System (GPS) navigation receiver mounted on the catamaran, and data were transmitted to the acquisition computer on the vessel via a 2.4 GHz radio link. During some portions of the survey, technical difficulties caused the GPS system mounted on the catamaran to malfunction. In these instances Real Time Kinematic (RTK) GPS navigation was obtained from a receiver mounted above the interferometric sonar head (This applies to files l25f2000 through l84f2000 acquired during Julian days 218 through 222). Layback positions, which account for the linear distance between the shipboard RTK-GPS receiver and the towed catamaran vehicle, were calculated trigonometrically during post-processing (see processing step 3). While the vehicle mounted GPS antenna was operational, positional accuracy is assumed to be ± 10 m. While the vehicle mounted GPS was not operational, positional accuracy is assumed to be ± 20 m; increased uncertainty arises because layback calculations do not account for fish motion behind the vessel, which is caused by sea state and vessel speed induced changes in the angle and scope of the tow cable.
Field activity 07001: The SB-424 was mounted on a rigid pole, approximately 1 m below the sea surface on the starboard side of the R/V Rafael. Position data were provided by a RTK-GPS navigation receiver mounted directly above the interferometric sonar head. While horizontal offsets between the SB-424 transducer and the RTK-GPS navigation receiver were not corrected in the sonar setup, this distance was less than 3 m, and the resulting positional accuracy is assumed to be ± 10 m.
Information unavailable from original metadata.
unknown
Information unavailable from original metadata.
The source information was incomplete and had to be modified to meet the standard. Only the source time period of content and source contribution was supplied.
Information unavailable from original metadata.
20060804
20070502
ground condition of two different date ranges: 20060804 to 20060820 and 20070422 to 20070502
Information unavailable from original metadata.
Seismic-reflection data acquisition 06012: Chirp seismic data were collected using an EdgeTech Geo-Star FSSB sub-bottom profiling system and an SB-0512i towfish (0.5-12 kHz), which was mounted on a catamaran and towed astern of the R/V Megan T. Miller of Port Jefferson, NY. EdgeTech J-Star seismic acquisition software was used to control the Geo-Star topside unit and digitally log trace data in the EdgeTech JSF format. Data were acquired using a 0.25-s shot rate, a 9-ms pulse length, and a 0.5 to 6 kHz frequency sweep. Recorded trace lengths were approximately 266 ms. Tracklines were spaced between 100 and 200 m apart in the shore parallel direction and between 1 and 3 km apart in the shore perpendicular direction.
Seismic-reflection data acquisition 07001: Chirp seismic data were collected using an EdgeTech Geo-Star FSSB sub-bottom profiling system and an SB-424 towfish (4-24 kHz), which was mounted on a rigid pole on the starboard side of the R/V Rafael of Woods Hole, MA. EdgeTech J-Star and Triton Imaging Inc. SB-Logger seismic acquisition software was used to control the Geo-Star topside unit and digitally log trace data in EdgeTech JSF and SEG-Y Rev. 1 formats, respectively. Data were acquired using a 0.25-s shot rate, a 10-ms pulse length, and a 4 to 16 kHz frequency sweep. Recorded trace lengths were approximately 250 ms. Tracklines were spaced 100 m apart in the shore parallel direction and between 200 m and 2 km apart in the shore perpendicular direction.
'jsftosegy' (no version), a C script developed by Tom O'Brien (USGS - Woods Hole Seafloor Mapping Group) was used to convert raw chirp traces in the JSF format (acquired using EdgeTech J-Star software) to chirp-processed, envelope traces in the SEG-Y rev. 1 standard format.
200810
Wayne Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd
Woods Hole
MA
02543-1598
USA
508-548-8700 x2226
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, Julian day, and time of day (UTC). Geographic coordinates (WGS84) were converted to UTM zone 19 coordinates (WGS84) 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. For SB-424 data collected during field activity 07001, 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 be unique fixes. Due to the amount of spurious navigation fixes removed from SB-512i data collected during field activity 06012, a 500 shot text file was generated later (see processing step 7) using the linear referencing tools contained in ArcGIS. A 500 shot interval was chosen because it corresponds to the annotation interval provided along the top of the seismic-reflection profile JPEG images, which are included in the '06012' and '07001' folders within 'GIS\hyperlink_images\seisimage'.
200810
Wayne Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd
Woods Hole
MA
02543-1598
USA
508-548-8700 x2226
508-457-2310
wbaldwin@usgs.gov
An AWK (no version) script was used to apply layback to seismic navigation acquired during portions of the 06012 survey when shipboard RTK-GPS was used in lieu of the non-operational GPS receiver mounted on the towed catamaran vehicle (This applies to files l25f2000 through l84f2000 acquired over Julian days 218 through 222. Attributes OLDEAST and OLDNORTH in the table 'DH_SeismicShot_unique.csv', which is included in the zip compressed version of the shapefile 'DH_SeismicShot_500.shp', document pre-layback shot/trace positions). The script utilized a read-and-do loop to calculate and apply layback offsets to trace positions.
During the initial loop through the script: 1) Easting and northing coordinates (UTM Zone 19, WGS84) for the first five traces of input navigation were read and easting and northing differentials between the consecutive positions were calculated; 2) The signs (+/-) of the differential values were compared to a look-up table to determine the appropriate conversion of the arc tangent (atan2(dy,dx)) angle between consecutive positions to a polar azimuth; 3) The average of the polar azimuths was calculated; 4) The sine and cosine of the average azimuth was calculated and multiplied by the linear distance between the catamaran and the shipboard RTK-GPS receiver, providing absolute values for easting and northing offsets, respectively; 5) A look-up table was used to determine the quadrant of the average azimuth and appropriately add or subtract the calculated offsets to the easting and northing coordinates of the first three input traces, producing final layback positions for those traces; 6) Layback and original easting and northing coordinates for the three adjusted traces were printed to a new layback navigation file that also retained additional attributes input records; and 7) Easting and northing coordinates of the fourth and fifth traces, the three azimuths computed between traces two, three, four, and five, and the average azimuth were held as input for calculations conducted in the subsequent loop.
During subsequent loops through the script: 1) Easting and northing coordinates for three additional traces from input navigation were read, and easting and northing differentials were calculated between the consecutive positions, including the last trace position held from the previous loop; 2) Three new polar azimuths were calculated using the differential values, then a new average azimuth was calculated from the three that were held, the new three, and the average held from the previous loop (the previously calculated average was factored into the new average to smooth "kinks" along the layback navigation that can result from significantly different average azimuths calculated from one loop to the next); 3) New layback offset values were computed, and applied to the easting and northing coordinates of the last two traces input during the previous loop, and the fist trace input during the present loop. 4) Layback and original easting and northing coordinates for the three adjusted traces were appended to the layback navigation file started in the previous loop; and 5) Easting and northing coordinates of the second and third traces, the three new azimuths, and the average azimuth from the present loop were held as input for calculations conducted in the subsequent loop.
Near the end of the input navigation file: 1) If less than three traces were present during a new loop, the layback offsets calculated during the previous loop were applied to remaining trace coordinates; 2) Layback and original easting and northing coordinates for the remaining adjusted traces were appended to the layback navigation file; and 3) The script reached its end, closed, and saved the layback navigation file.
In this fashion, the script approximated a moving window, in which the average of six trace to trace azimuths was used to calculate layback offsets for three central trace positions. Exceptions were at the start of a file, where the first three input trace positions were adjusted using offsets calculated from the average of only four azimuths, and possibly at the end of a file, where remaining traces may have been adjusted using the offsets calculated during the previous loop.
200810
Wayne Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd
Woods Hole
MA
02543-1598
USA
508-548-8700 x2226
508-457-2310
wbaldwin@usgs.gov
Text files containing unique shot point positions for each seismic line (including the layback-adjusted SB-512i lines from field activity 06012) were concatenated into a comma-delimited text file ('DH_SeismicShot_unique.csv'), then imported into ArcMap (version 9.2) using 'Add XY data' and saved as points (Geographic, WGS84) in the ESRI shapefile format ('DH_SeismicShot_unique.shp').
200810
Wayne Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd
Woods Hole
MA
02543-1598
USA
508-548-8700 x2226
508-457-2310
wbaldwin@usgs.gov
The shapefile containing unique shot point positions, created in the previous step, 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 ('DH_SeismicTrackline.shp'), based on record order. The 'FILENAME' field was used to define which points were used to generate each polyline feature. Using XTools Pro (version 4.1.0) for ArcGIS desktop, the length of each polyline segment was calculated and included in the attribute field 'LENGTH', specifying UTM, Zone 19 N, WGS84, and kilometers. In addition, table attributes for the year ('YEAR') and Julian day ('JULDAY') of data collection, device used to collect the data ('DEVICEID'), survey vessel ('VEHICLEID'), and WHSC field activity number ('SURVEYID') were added and populated using the table editor in ArcMap (version 9.2).
200810
Wayne Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd
Woods Hole
MA
02543-1598
USA
508-548-8700 x2226
508-457-2310
wbaldwin@usgs.gov
Edits to the metadata were made to fix any errors that MP v 2.9.30 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. The source information was incomplete and had to be modified to meet the standard. Only the source time period of content and source contribution was supplied. The format of the time period of content had to be fixed. Other minor edits were probably performed (title, publisher, publication place, etc.). 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.
20151112
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
mailing and physical address
384 Woods Hole Rd.
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
315
0.000001
0.000001
Decimal degrees
D_WGS_1984
WGS_1984
6378137.000000
298.257224
DH_SeismicTrackline
Trackline for seismic profiles
USGS
FID
Internal feature number
ESRI
Sequential unique whole numbers that are automatically generated
Shape
Feature geometry.
ESRI
Coordinates defining the features
FILENAME
Name of seismic data file
USGS
Character string of width 50
IMAGENAME
Name of seismic profile JPEG image used as hyperlink
USGS
Character string of width 254
YEAR
Calendar year data were collected
USGS
Character string of width 254
JULDAY
Julian day data were collected
USGS
Character string of width 254
LENGTH
Length of seismic profile in kilometers (UTM Zone 19N, WGS84)
USGS
0.565872
14.599348
SURVEYID
WHSC field activity number
USGS
Character string of width 10
DEVICEID
Sonar device used to collect seismic-reflection data
USGS
Character string of width 15
VEHICLEID
Survey vessel name
USGS
Character string of width 25
Wayne Baldwin
U.S. Geological Survey, Woods Hole Science Center
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543
USA
508-548-8700 x2226
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.
SHP
ArcGIS 9.2
ESRI polyline shapefile
Trackline navigation for EdgeTech SB-512i and SB-424 chirp seismic-reflection data collected by the U.S. Geological Survey offshore of Massachusetts between Duxbury and Hull
Use WinZip or pkUnzip
4.4
http://pubs.usgs.gov/of/2009/1072/GIS/shapefile/DH_SeismicTrackline.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 Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
USA
508-548-8700 x2226
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