DH_SeismicShot_500: shot point navigation at even 500 shot intervals 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.

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: U.S. Geological Survey

Publication_Date: 2010

Title:

DH_SeismicShot_500: shot point navigation at even 500 shot intervals 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.

Edition: 1.0

Geospatial_Data_Presentation_Form: vector digital data

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 2009-1072

Publication_Information:

Publication_Place: Woods Hole Science Center, Woods Hole, Massachusetts

Publisher: U.S. Geological Survey, Coastal and Marine Geology Program

Online_Linkage:

<https://pubs.usgs.gov/of/2009/1072/GIS/shapefile/DH_SeismicShot_500.zip>

Online_Linkage: <https://pubs.usgs.gov/of/2009/1072/html/appendix1.html>

Larger_Work_Citation:

Citation_Information:

Originator: Walter A. Barnhardt

Originator: Seth D. Ackerman

Originator: Brian D. Andrews

Originator: Wayne E. Baldwin

Publication_Date: 2010

Title:

Geophysical and Sampling Data from the Inner Continental Shelf: Duxbury to Hull, Massachusetts.

Edition: 1.0

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 2009-1072

Publication_Information:

Publication_Place: Woods Hole Science Center, Woods Hole, Massachusetts

Publisher: U.S. Geological Survey, Coastal and Marine Geology Program

Online_Linkage: <https://pubs.usgs.gov/of/2009/1072/>

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 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.

Purpose:

This dataset contains shot point navigation at even 500 shot intervals 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.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20060804; 20070422

Ending_Date: 20060820; 20070502

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -70.828283

East_Bounding_Coordinate: -70.595783

North_Bounding_Coordinate: 42.339977

South_Bounding_Coordinate: 42.080400

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 Science Center

Theme_Keyword: WHSC

Theme_Keyword: Seafloor

Theme_Keyword: Marine Geology

Theme_Keyword: WHSC field activity serial number 06012

Theme_Keyword: WHSC field activity serial number 07001

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: 424

Theme_Keyword: R/V Megan T. Miller

Theme_Keyword: R/V Rafael

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: General

Place_Keyword: North America

Place_Keyword: United States

Place_Keyword: Atlantic Ocean

Place_Keyword: Massachusetts

Place_Keyword: Boston South Shore

Place_Keyword: Massachusetts Bay

Place_Keyword: Cape Cod Bay

Place_Keyword: Nantasket Beach

Place_Keyword: Hull Bay

Place_Keyword: Scituate

Place_Keyword: Marshfield

Place_Keyword: Brant Rock

Place_Keyword: Duxbury Beach

Place_Keyword: Duxbury Bay

Stratum:

Stratum_Keyword_Thesaurus: General

Stratum_Keyword: Seafloor

Stratum_Keyword: Subsurface

Temporal:

Temporal_Keyword_Thesaurus: General

Temporal_Keyword: 2006

Temporal_Keyword: 2007

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:

<https://pubs.usgs.gov/of/2009/1072/GIS/browse_jpg/big/DH_SeismicShot_500.jpg>

Browse_Graphic_File_Description:

Shot point navigation at even 500 shot intervals for EdgeTech 512i and 424 seismic-reflection data collected offshore of Massachusetts between Duxbury and Hull

Browse_Graphic_File_Type: JPEG

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.1850

Cross_Reference:

Citation_Information:

Originator: John Stockwell

Publication_Date: 2008

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/>

Cross_Reference:

Citation_Information:

Originator: Paul Henkart

Publication_Date: 2007

Title: SIOSEIS

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 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/SEGportalWEBproject/prod/SEG-Publications/Pub-Technical-Standards/Documents/seg_y_rev1.pdf>

Cross_Reference:

Citation_Information:

Originator: Walter A. Barnhardt

Originator: Brian D. Andrews

Originator: Bradford Butman

Publication_Date: 2006

Title:

High-Resolution Mapping of the Inner Continental Shelf: Nahant to Gloucester, Massachusetts

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 2005-1293

Publication_Information:

Publication_Place: Woods Hole Science Center, Woods Hole, MA

Publisher: U.S. Geological Survey, Coastal and Marine Geology Program

Online_Linkage: <https://pubs.usgs.gov/of/2005/1293/>

Cross_Reference:

Citation_Information:

Originator: Seth D. Ackerman

Originator: Bradford Butman

Originator: Walter A. Barnhardt

Originator: William W. Danforth

Originator: James M. Crocker

Publication_Date: 2006

Title:

High-Resolution Geologic Mapping of the Inner Continental Shelf: Boston Harbor and Approaches, Massachusetts

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 2006-1008

Publication_Information:

Publication_Place: Woods Hole Science Center, Woods Hole, MA

Publisher: U.S. Geological Survey, Coastal and Marine Geology Program

Online_Linkage: <https://pubs.usgs.gov/of/2006/1008/>

Cross_Reference:

Citation_Information:

Originator: Walter A. Barnhardt

Originator: Brian D. Andrews

Originator: Seth D. Ackerman

Originator: Wayne E. Baldwin

Originator: Christopher J. Hein

Publication_Date: 2009

Title:

High-Resolution Geological Mapping of the Inner Continental Shelf: Cape Ann to Salisbury Beach, Massachusetts

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 2007-1373

Publication_Information:

Publication_Place: Woods Hole Science Center, Woods Hole, MA

Publisher: U.S. Geological Survey, Coastal and Marine Geology Program

Online_Linkage: <https://pubs.usgs.gov/of/2007/1373/>

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.

Completeness_Report:

Sections 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. Shot point data 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.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

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 the horizontal offset between the SB-424 and the RTK-GPS navigation receiver was not accounted for, this distance was less than 3 m, and the resulting positional accuracy is assumed to be ± 10 m.

Lineage:

Source_Information:

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20060804; 20070422

Ending_Date: 20060820; 20070502

Source_Currentness_Reference: ground condition

Source_Contribution:

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.

Process_Step:

Process_Description:

'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.

Process_Date: 200810

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:

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'.

Process_Date: 200810

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 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 for shapefile 'DH_SeismicShot_unique.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.

Process_Date: 200810

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:

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').

Process_Date: 200810

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:

The shapefile containing unique shot point positions, created in the previous step, was used as an input for VACExtras (version 1.97), a collection of VB tools developed by VeeAnn Cross (USGS-WHSC), which converts point data to a new polyline shapefile, 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).

Process_Date: 200810

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:

The records for SB-512i data collected during field activity 06012 were selected from the shapefile containing unique shot point positions ('DH_SeismicShot_unique.csv', which was used to create the shapefile 'DH_SeismicShot_unique.shp') and the polyline shapefile generated in the previous step ('DH_SeismicTrackline.shp'); each was saved as a new temporary point and polyline shapefile, respectively. The new temporary shapefiles were then used as inputs for linear referencing tools in the ArcMap (version 9.2) toolbox to produce a new temporary shapefile containing even 500 shot intervals for the SB-512i navigation data collected during field activity 06012. This flow consisted of the following steps: 1) Routes were created from the polyline shapefile and calibrated with the point shapefile; 2) Start, end, and 500 shot interval hatch marks were created along the calibrated routes; 3) Hatchmarks were converted to graphics; 4) Graphics were converted to points and saved to a new shapefile using XTools Pro (version 4.1.0) for ArcGIS desktop ; 5) Point features in the new shapefile were located along the calibrated routes and the combined information was output as an event table; 6) Using the new event table, a route event layer was produced and converted to a new shapefile containing the even 500 shot interval points; and 7) The two-way table sort function in VACExtras (version 1.97) was used to sort the resulting shapefile by 'FILENAME' and ascending 'SHOTNUM' values. XTools Pro (version 4.1.0) for ArcGIS desktop was used to add and calculate 4 new fields in the shapefile containing even 500 shot intervals for the SB-512i data collected during field activity 06012. 'EAST' and 'NORTH' contain the UTM, Zone 19, WGS84, meters coordinates for the points, and 'LON' and 'LAT' contain their Geographic, WGS84, decimal degrees coordinates. 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).

Process_Date: 200810

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:

Text files containing even 500 shot interval point positions for SB-424 data collected during field activity 07001 were concatenated into a comma-delimited text file, then imported into ArcMap (version 9.2) and saved as points (Geographic, WGS84) in the ESRI shapefile format. 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).

Using the Merge function in the Data Management > General toolbox in ArcMap (version 9.2), shapefiles containing even 500 shot interval point positions for field activities 06012 and 07001 were merged together into the single shapefile 'DH_SeismicShot_500.shp'.

Process_Date: 200810

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: 5184

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: DH_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: FILENAME

Attribute_Definition: Name of seismic data file

Attribute_Definition_Source: USGS

Attribute_Domain_Values:

Unrepresentable_Domain: Character string of width 50

Attribute:

Attribute_Label: SHOTNUM

Attribute_Definition: Shot number (first, last and every 500 shots between)

Attribute_Definition_Source: USGS

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1

Range_Domain_Maximum: 18270

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: 349381.99

Range_Domain_Maximum: 368175.97

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: 4659939.66

Range_Domain_Maximum: 4689141.34

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: -70.828283

Range_Domain_Maximum: -70.595783

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: 42.0804

Range_Domain_Maximum: 42.339977

Attribute_Units_of_Measure: Decimal degrees

Attribute_Measurement_Resolution: 0.000001

Attribute:

Attribute_Label: YEAR

Attribute_Definition: Calendar year data were collected

Attribute_Definition_Source: USGS

Attribute_Domain_Values:

Unrepresentable_Domain: Character string of width 5

Attribute:

Attribute_Label: SURVEYID

Attribute_Definition: WHSC field activity number

Attribute_Definition_Source: USGS

Attribute_Domain_Values:

Unrepresentable_Domain: Character string of width 10

Attribute:

Attribute_Label: DEVICEID

Attribute_Definition: Sonar device used to collect seismic-reflection data

Attribute_Definition_Source: USGS

Attribute_Domain_Values:

Unrepresentable_Domain: Character string of width 15

Attribute:

Attribute_Label: VEHICLEID

Attribute_Definition: Survey vessel name

Attribute_Definition_Source: USGS

Attribute_Domain_Values:

Unrepresentable_Domain: Character string of width 25

Attribute:

Attribute_Label: JULDAY

Attribute_Definition: Julian day data were collected

Attribute_Definition_Source: USGS

Attribute_Domain_Values:

Unrepresentable_Domain: Character string of width 5

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 9.2

Format_Specification: ESRI point shapefile

Format_Information_Content:

Shot point navigation at even 500 shot intervals 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

File_Decompression_Technique: Use WinZip or pkUnzip

Transfer_Size: 0.3 Mb

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

<https://pubs.usgs.gov/of/2009/1072/GIS/shapefile/DH_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) 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.

Metadata_Reference_Information:

Metadata_Date: 20091029

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