VS_SeismicShot_500: Shot point navigation at even 500 shot intervals for EdgeTech SB-512i chirp seismic-reflection data collected by the U.S. Geological Survey offshore of Massachusetts within Vineyard Sound by the U.S. Geological Survey in 2009, 2010, and 2011 (ESRI Point Shapefile, Geographic, WGS84).

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 2012
Title:
VS_SeismicShot_500: Shot point navigation at even 500 shot intervals for EdgeTech SB-512i chirp seismic-reflection data collected by the U.S. Geological Survey offshore of Massachusetts within Vineyard Sound by the U.S. Geological Survey in 2009, 2010, and 2011 (ESRI Point Shapefile, Geographic, WGS84).
Edition: 1.0
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2012-1006
Publication_Information:
Publication_Place:
Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Online_Linkage:
<http://pubs.usgs.gov/of/2012/1006/GIS/shapefile/VS_SeismicShot_500.shp>
Online_Linkage: <http://pubs.usgs.gov/of/2012/1006/appendix.html>
Larger_Work_Citation:
Citation_Information:
Originator: Brian D. Andrews
Originator: Seth D. Ackerman
Originator: Wayne E. Baldwin
Originator: David S. Foster
Originator: William C. Schwab
Publication_Date: 2012
Title:
High-Resolution Geophysical Data From the Inner Continental Shelf at Vineyard Sound, Massachusetts.
Edition: 1.0
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2012-1006
Publication_Information:
Publication_Place:
Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Online_Linkage: <http://pubs.usgs.gov/of/2012/1006/>
Description:
Abstract:
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 Coastal and Marine 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 of coastal Massachusetts, primarily in water depths of 3-30 meters deep. 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 the study area located in Vineyard Sound, Massachusetts includes high-resolution geophysics (bathymetry, backscatter intensity, and seismic reflection), and ground validation (sediment samples, video tracklines, and bottom photographs). The data were collected during three separate surveys conducted between 2009 and 2011 (USGS-WHSC surveys 2009-002-FA, 2010-004-FA, and 2011-004-FA) and cover 340 square kilometers of the inner continental shelf. More information about the individual USGS surveys conducted as part of the Vineyard Sound project can be found on Woods Hole Coastal and Marine Science Center Field Activity webpages:

2009-002-FA: <http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=2009-002-FA>

2010-004-FA: <http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=2010-004-FA>

2011-004-FA: <http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=2011-004-FA>

Purpose:
This dataset contains shot point navigation at even 500 shot intervals for 3800 km of EdgeTech SB-512i chirp seismic-reflection data collected by the U.S. Geological Survey during three Woods Hole Science Center cruises (2009-002-FA , 2010-004-FA, and 2011-004-FA) offshore of Massachusetts within Vineyard Sound.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20090602
Ending_Date: 20110517
Currentness_Reference:
ground condition of individual surveys on the following dates: 2009062-20090603; 20100521-20100604; 20110507-20110509; 20110514-20110517
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -71.028392
East_Bounding_Coordinate: -70.431711
North_Bounding_Coordinate: 41.548081
South_Bounding_Coordinate: 41.271214
Keywords:
Theme:
Theme_Keyword_Thesaurus: General
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: CMGP
Theme_Keyword: Woods Hole Coastal and Marine Science Center
Theme_Keyword: WHSC
Theme_Keyword: Seafloor
Theme_Keyword: Marine Geology
Theme_Keyword: field activity number 2009-002-FA
Theme_Keyword: field activity number 2010-004-FA
Theme_Keyword: field activity number 2011-004-FA
Theme_Keyword: USGS InfoBank ID M-2-09-BZ
Theme_Keyword: USGS InfoBank ID U-4-10-BZ
Theme_Keyword: USGS InfoBank ID U-04-11-BZ
Theme_Keyword: seismic profile
Theme_Keyword: shot point navigation
Theme_Keyword: seismic navigation
Theme_Keyword: seismic reflection
Theme_Keyword: chirp
Theme_Keyword: EdgeTech
Theme_Keyword: 512i
Theme_Keyword: M/V Megan T. Miller
Theme_Keyword: M/V Scarlett Isabella
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: oceans
Theme_Keyword: oceans and coastal
Theme_Keyword: oceans and estuaries
Theme_Keyword: location
Place:
Place_Keyword_Thesaurus: USGS Geographic Names Information System
Place_Keyword: North America
Place_Keyword: United States
Place_Keyword: Massachusetts
Place_Keyword: Cape Cod
Place_Keyword: Atlantic Ocean
Place_Keyword: Vineyard Sound
Place_Keyword: Nantucket Sound
Stratum:
Stratum_Keyword_Thesaurus: General
Stratum_Keyword: Seafloor
Stratum_Keyword: Subsurface
Temporal:
Temporal_Keyword_Thesaurus: General
Temporal_Keyword: 2009
Temporal_Keyword: 2010
Temporal_Keyword: 2011
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 source of this information
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Wayne Baldwin
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 x2226
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: wbaldwin@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name:
<http://pubs.usgs.gov/of/2012/1006/GIS/browse_jpg/VS_SeismicShot_500.jpg>
Browse_Graphic_File_Description:
Shot point navigation at even 500 shot intervals for EdgeTech 512i chirp seismic-reflection data collected offshore of Massachusetts within Vineyard Sound
Browse_Graphic_File_Type: JPEG
Native_Data_Set_Environment:
Microsoft Windows Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.4095
Cross_Reference:
Citation_Information:
Originator: John Stockwell
Publication_Date: 2011
Title: CWP/SU: Seismic Uni*x
Publication_Information:
Publication_Place: Golden, CO
Publisher: Center for Wave Phenomena - Colorado School of Mines
Online_Linkage: <http://www.cwp.mines.edu/cwpcodes/index.html>
Cross_Reference:
Citation_Information:
Originator: Paul Henkart
Publication_Date: 2011
Title: SIOSEIS
Publication_Information:
Publication_Place: LaJolla, CA
Publisher:
Scripps Institution of Oceanography, University of California - San Diego
Online_Linkage: <http://sioseis.ucsd.edu/index.html>
Cross_Reference:
Citation_Information:
Originator: Michael W. Norris and Alan K. Faichney
Publication_Date: 2002
Title: SEGY Rev.1 Data Exchange Format1
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:
Attribute_Accuracy:
Attribute_Accuracy_Report: All attributes were checked in a consistent manner.
Logical_Consistency_Report:
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.
Completeness_Report:
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 2009-002-FA, 2010-004-FA, and 2011-004-FA that are within the Vineyard Sound study are included in this spatial dataset. Trackline navigation for approximately 4500 km of additional seismic-reflection profiles collected within Buzzards Bay, Massachusetts during these field activities were published in USGS Open-File Report 2012-1002 High-Resolution Geophysical Data from the Inner Continental Shelf: Buzzards Bay, Massachusetts (<http://pubs.usgs.gov/of/2012/1002/>).
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Field activity 2009-002-FA: The SB-0512i was mounted on a catamaran sled and towed at the sea surface approximately 30 - 40 m astern of the M/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. Positional accuracy is assumed to be ± 10 m. Field activity 2010-004-FA: The SB-0512i was mounted on a catamaran sled and towed at the sea surface approximately 30 - 40 m astern of the M/V Megan T. Miller. DGPS navigation was obtained from a receiver mounted on top of the acquisition van. Layback positions, which account for the linear distance between the shipboard DGPS receiver and the towed catamaran vehicle, were calculated trigonometrically during post-processing (see processing step 3). 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 2011-004-FA: The SB-0512i was mounted on a catamaran sled and towed at the sea surface approximately 50 m astern of the M/V Scarlett Isabella. 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. Technical difficulties during portions of 2011-004-FA caused the GPS system mounted on the catamaran to malfunction, so DGPS navigation was obtained from a receiver mounted above the interferometric sonar head (This applies to all files acquired over Julian days 134-137). Layback positions, which account for the linear distance between the shipboard DGPS 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.
Lineage:
Source_Information:
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20090602; 20100521; 20110507
Ending_Date: 20090603; 20100604; 20110517
Source_Contribution:
Seismic-reflection data acquisition 2009-002-FA: 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 M/V Megan T. Miller. Chesapeake Technologies' SonarWiz (v.4.04.0031) seismic acquisition software was used to control the Geo-Star topside unit, digitally log trace data in the SEG-Y Rev. 1 format (IEEE floating point), and record GPS navigation coordinates to the SEG-Y trace headers (in arc seconds of Latitude and Longitude, multiplied by a scalar of 100). Data were acquired using a 0.12-s shot rate, a 20-ms pulse length, and a 0.7 to 12 kHz frequency sweep. Traces were recorded in depth, assuming a constant sound velocity of 1500 m/s, with trace lengths of approximately 66 m (1250 samples/trace and .000053-s sample interval). Seismic-reflection data acquisition 2010-004-FA: 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 M/V Megan T. Miller. Chesapeake Technologies' SonarWiz (v.4.04.0111) seismic acquisition software was used to control the Geo-Star topside unit, digitally log trace data in the SEG-Y Rev. 1 format (IEEE floating point), and record GPS navigation coordinates to the SEG-Y trace headers (in arc seconds of Latitude and Longitude, multiplied by a scalar of 100). Files l113f1 - l115f1 were acquired using a 0.25-s shot rate, a 5-ms pulse length, and a 0.5 to 8 kHz frequency sweep. Recorded trace lengths were approximately 200 ms (4340 samples/trace and .000046-s sample interval). The remaining files from Julian days 141 - 155 were acquired using a 0.25-s shot rate, a 50-ms pulse length, and a 0.5 to 4.5 kHz frequency sweep. Recorded trace lengths were approximately 199 ms (4328 samples/trace and .000046-s sample interval). Seismic-reflection data acquisition 2011-004-FA: 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 M/V Scarlett Isabella of Cape May, NJ. Chesapeake Technologies' SonarWiz (v.5.03.0016) seismic acquisition software was used to control the Geo-Star topside unit, digitally log trace data in the SEG-Y Rev. 1 format (IEEE floating point), and record GPS navigation coordinates to the SEG-Y trace headers (in arc seconds of Latitude and Longitude, multiplied by a scalar of 100). Data were acquired using a 0.25-s shot rate, a 5-ms pulse length, and a 0.5 to 8 kHz frequency sweep. Recorded trace lengths were approximately 200 ms (4340 samples/trace and .000046-s sample interval).
Process_Step:
Process_Description:
SIOSEIS (version 2010.2.25) was used to read SEG-Y files, renumber shots starting from one, and write out new SEG-Y files. The original shot numbers, which were assigned by SonarWiz sequentially over the duration of an acquisition session despite SEG-Y file changes, are preserved in the raw SEG-Y data.
Process_Date: 201110
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Wayne Baldwin
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 x2226
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: wbaldwin@usgs.gov
Process_Step:
Process_Description:
Seismic Unix (version 4.2) was used to read renumbered SEG-Y files, write a Seismic Unix file, and extract SEG-Y trace header information, including 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). Header information from each SEG-Y file were saved to text files after an AWK (no version) filter was used to maintain the first and last shots, shots at multiples of 100, and shots with unique navigation coordinates. End shots and shots at multiples of 100 may not have unique navigation coordinates. Separate text files containing the first and last shots and even 500 shot intervals were also saved. A 500 shot interval was chosen because it corresponds to the annotation interval provided along the top of the seismic-reflection profile PNG images, which are included in the '2009-002-FA', '2010-004-FA', and '2011-004-FA' folders within 'GIS\hyperlink_images\seisimage'.
Process_Date: 201110
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Wayne Baldwin
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 x2226
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: wbaldwin@usgs.gov
Process_Step:
Process_Description:
An AWK (no version) script was used to apply layback to seismic navigation acquired during portions of the 2010-004-FA and 2011-004-FA surveys when shipboard DGPS was used in lieu of the non-operational GPS receiver mounted on the towed catamaran vehicle. (This includes data collected during Julian days 141 - 155 on 2010-004-FA, and Julian days 134 - 135 (except for 'transit4') on 2011-004-FA. Attributes oldEast and oldNorth in the table 'VS_SeismicShot_unique.csv', which is included in the zip compressed version of the shapefile 'VS_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 DGPS receiver (31 or 37 m during 2010-004-FA and 51.5 m during 2011-004-FA), 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 first 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.

Process_Date: 201110
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Wayne Baldwin
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 x2226
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: wbaldwin@usgs.gov
Process_Step:
Process_Description:
AWK was used to filter the unique navigation text files to generate additional text files containing the first and last shots, and even 500 shot positions for each seismic line (including the layback-adjusted SB-512i lines from 2010-004-FA and 2011-004-FA). The 500 shot text files were concatenated into a comma-delimited text file, AWK was used to add and populate attribute fields 'SurveyID', 'DeviceID', and 'VehicleID', then the text file was imported into ArcMap (version 9.3) using 'Add XY data' and saved as points (Geographic, WGS84) in the ESRI shapefile format.
Process_Date: 201110
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Wayne Baldwin
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 x2226
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: wbaldwin@usgs.gov

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Entity point
Point_and_Vector_Object_Count: 13358

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.000001
Longitude_Resolution: 0.000001
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: D_WGS_1984
Ellipsoid_Name: WGS_1984
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257224

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: VS_SeismicShot_500
Entity_Type_Definition: shot point navigation for seismic profiles (500 shot interval)
Entity_Type_Definition_Source: USGS
Attribute:
Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: East
Attribute_Definition: Easting coordinate in UTM Zone 19 meters, WGS84
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 330352.74
Range_Domain_Maximum: 380410.99
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.01
Attribute:
Attribute_Label: North
Attribute_Definition: Northing coordinate in UTM Zone 19 meters, WGS84
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4570466.21
Range_Domain_Maximum: 4601005.71
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.01
Attribute:
Attribute_Label: Lon
Attribute_Definition: Longitude coordinate in decimal degrees, WGS84
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -71.028392
Range_Domain_Maximum: -70.431711
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: 0.000001
Attribute:
Attribute_Label: Lat
Attribute_Definition: Latitude coordinate in decimal degrees, WGS84
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 41.271214
Range_Domain_Maximum: 41.548081
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: 0.000001
Attribute:
Attribute_Label: FileName
Attribute_Definition: Name of seismic data file
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Unrepresentable_Domain: Character set.
Attribute:
Attribute_Label: ImageName
Attribute_Definition: Name of seismic profile image
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Unrepresentable_Domain: Character set.
Attribute:
Attribute_Label: Shot
Attribute_Definition: Shot number (first, last, and every 500 shot between)
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 47443
Attribute_Units_of_Measure: shot number
Attribute_Measurement_Resolution: 1.0
Attribute:
Attribute_Label: Year
Attribute_Definition: Calendar year data were collected
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2009
Range_Domain_Maximum: 2011
Attribute_Units_of_Measure: Calendar year
Attribute_Measurement_Resolution: 1 year
Attribute:
Attribute_Label: JulDay
Attribute_Definition: Julian day data were collected
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 127
Range_Domain_Maximum: 155
Attribute_Units_of_Measure: Julian Day
Attribute_Measurement_Resolution: 1 Julian Day
Attribute:
Attribute_Label: UTC
Attribute_Definition: UTC time of seismic shot (HH:MM:SS)
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Unrepresentable_Domain: Character set.
Attribute:
Attribute_Label: oldEast
Attribute_Definition:
pre-layback calculation Easting coordinate in UTM Zone 19 meters, WGS84. Attribute value of "n/a" means the coordinates did not require adjustment.
Attribute_Definition_Source: USGS
Attribute:
Attribute_Label: oldNorth
Attribute_Definition:
pre-layback calculation Northing coordinate in UTM Zone 19 meters, WGS84
Attribute_Definition_Source: USGS
Attribute:
Attribute_Label: SurveyID
Attribute_Definition: WHSC field activity number
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Unrepresentable_Domain: Character set.
Attribute:
Attribute_Label: DeviceID
Attribute_Definition: Sonar device used to collect seismic-reflection data
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Unrepresentable_Domain: Character set.
Attribute:
Attribute_Label: VehicleID
Attribute_Definition: Survey vessel name
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Unrepresentable_Domain: Character set.

Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Wayne Baldwin
Contact_Organization: U.S. Geological Survey, Woods Hole Science Center
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
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2226
Contact_Electronic_Mail_Address: wbaldwin@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: SHP
Format_Version_Number: ArcGIS 9.3
Format_Specification: ESRI point shapefile
Format_Information_Content:
This WinZip file contains shot point navigation at even 500 shot intervals (VS_SeismicSHot_500.shp) for EdgeTech SB-512i chirp seismic-reflection data collected by the U.S. Geological Survey offshore of Massachusetts within Vineyard Sound and associated metadata. The WinZip file also contains a comma delimited file (VS_SeismicShot_Unique.csv), that contains every unique shot point for the same surveys.
File_Decompression_Technique: Use WinZip or pkUnzip
Transfer_Size: 40 MB
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
<http://pubs.usgs.gov/of/2012/1006/GIS/shapefile/VS_SeismicShot_500.zip>
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
Technical_Prerequisites:
This zip file contains data available in Environmental Systems Research Institute (ESRI) shapefile format. The user must have software capable of uncompressing the WinZip file and displaying the shapefile. 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.

Metadata_Reference_Information:
Metadata_Date: 20120924
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Wayne Baldwin
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 x2226
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: wbaldwin@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_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile

Generated by mp version 2.8.25 on Mon Sep 24 08:31:45 2012