SEISMIC_SHT.SHP: Unique shot point navigation for EdgeTech SB-512i chirp seismic-reflection data collected by the U.S. Geological Survey off the southern shore of Martha's Vineyard, MA, 2007 (ESRI POINT SHAPEFILE).

Metadata also available as - [Outline] - [Parseable text]

Frequently-anticipated questions:

What does this data set describe?

Title:
SEISMIC_SHT.SHP: Unique shot point navigation for EdgeTech SB-512i chirp seismic-reflection data collected by the U.S. Geological Survey off the southern shore of Martha's Vineyard, MA, 2007 (ESRI POINT SHAPEFILE).
Abstract:
The USGS Woods Hole Science Center conducted a nearshore geophysical survey offshore of the southern coast of Martha's Vineyard, in the vicinity of the Martha's Vineyard Coastal Observatory (MVCO) in August 2007. This mapping program was part of a larger research effort supporting the Office of Naval Research (ONR) Ripples Directed-Research Initiative (DRI) studies at MVCO by providing data collection and modeling. The geophysical data will be used to provide initial conditions for wave and circulation models for the study area. Ultimately, geophysical mapping, oceanographic measurements and modeling will help to improve our understanding of coastal sediment-transport processes.

The geophysical mapping utilized a suite of high-resolution instrumentation to map the surficial sediment distribution, depth and sub-surface geology: dual-frequency 100/500 KHz sidescan-sonar system, 234-KHz interferometric sonar, and 500 Hz -12 KHz chirp sub-bottom profiler. The survey was conducted aboard the M/V Megan Miller August 9-13, 2007. The study area covers 35 square kilometers from about 0.2 km to 5-km offshore of the south shore of Martha's Vineyard, and ranges in depth from ~ 5 to 20 meters.

  1. How should this data set be cited?

    U.S. Geological Survey, 2009, SEISMIC_SHT.SHP: Unique shot point navigation for EdgeTech SB-512i chirp seismic-reflection data collected by the U.S. Geological Survey off the southern shore of Martha's Vineyard, MA, 2007 (ESRI POINT SHAPEFILE).: Open-File Report 2008-1288, U.S. Geological Survey, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Denny, J.F., Danforth, W.W., Foster, D.S., and Sherwood, C.R., 2009, Geophysical Data Collected off the South Shore of Martha's Vineyard, Massachusetts: Open-File Report 2008-1288, U.S. Geological Survey, Woods Hole.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -70.600292
    East_Bounding_Coordinate: -70.511213
    North_Bounding_Coordinate: 41.347370
    South_Bounding_Coordinate: 41.301252

  3. What does it look like?

    <https://pubs.usgs.gov/of/2008/1288/GIS_catalog/Tracklines/seismic_sht_sm.jpg> (JPEG)
    JPEG image of unique shot point navigation for EdgeTech 512i seismic-reflection data collected off the southern shore of Martha's Vineyard, MA, 2007ile

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 09-Aug-2007
    Ending_Date: 13-Aug-2007
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • Entity point (272257)

    2. What coordinate system is used to represent geographic features?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.

  7. How does the data set describe geographic features?

    seismic_sht
    ESRI point shapefile (Source: ESRI)

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    East
    Easting coordinate in UTM Zone 19 meters, WGS84 (Source: U.S. Geological Survey)

    Range of values
    Minimum:366116.99
    Maximum:373561.98
    Units:meters

    North
    Northing coordinate in UTM Zone 19 meters, WGS84 (Source: U.S. Geological Survey)

    Range of values
    Minimum:4573406.82
    Maximum:4578537.29
    Units:meters

    Lon
    Longitude coordinate in decimal degrees, WGS84 (Source: U.S. Geological Survey)

    Range of values
    Minimum:-70.600292
    Maximum:-70.511213
    Units:decimal degrees

    Lat
    Latitude coordinate in decimal degrees, WGS84 (Source: U.S. Geological Survey)

    Range of values
    Minimum:41.301252
    Maximum:41.34737
    Units:decimal degrees

    FileName
    Name of the seismic line file (Source: U.S. Geological Survey)

    Naming convention for the JSF format seismic data. Format: L1F1_000, where L=Line, 1= Line number, f=file, 1=file number, and '_000' is an optional JSF line incrementor.

    Shotnum
    Number corresponding to sequential, along-profile seismic shots (Source: U.S. Geological Survey)

    Range of values
    Minimum:1
    Maximum:12761
    Units:individual seismic shot number

    Year
    Calendar Year in which data were collected (Source: U.S. Geological Survey)

    ValueDefinition
    2007Calendar year of data acquisition for USGS cruise 07011

    JD
    Julian day during which data were collected (Source: U.S. Geological Survey)

    Range of values
    Minimum:221
    Maximum:225
    Units:Julian Day (Year 2007)

    Hr
    Hour (UTC) time of sesimc shot (Source: U.S. Geological Survey)

    Range of values
    Minimum:0
    Maximum:23
    Units:Hour - 24-hr Day

    Mn
    Minute (UTC) time of seismic shot (Source: U.S. Geological Survey)

    Range of values
    Minimum:0
    Maximum:59
    Units:Minute

    Sc
    Second (UTC) time of seismic shot (Source: U.S. Geological Survey)

    Range of values
    Minimum:0
    Maximum:59
    Units:Second

    Cruise_ID
    USGS Cruise ID number listing calendar year and USGS cruise ID (Source: U.S. Geological Survey)

    ValueDefinition
    07011USGS Cruise Identification Number, where the first 2 digits represent calendar year and the last three digits represent the cruise number

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    Jane Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700x2311 (voice)
    5084572310 (FAX)
    jdenny@usgs.gov

Why was the data set created?

This dataset contains unique shot point navigation for approximately 680 km of EdgeTech SB-512i chirp seismic-reflection data collected by the U.S. Geological Survey during Woods Hole Science Center cruise 07011 off the southern shore of Martha's Vineyard, MA, 2007. These data are provided to supply the complete shot point navigation for either correlation to JPEG images of the seismic profiles or for input into seismic interpretation packages.

How was the data set created?

  1. From what previous works were the data drawn?

    (source 1 of 1)
    .

    Source_Contribution:
    Approximately 680 km of high-resolution chirp seismic-reflection profiles were collected using an EdgeTech Geo-Star FSSB sub-bottom profiling system and an SB-0512i towfish (0.5-12 kHz) mounted on a catamaran and towed off the stern of the R/V Megan Miller. 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 (<http://www.edgetech.com/productlinemarine.html>). Data were acquired using a 0.25-s shot rate, 5-ms pulse length and a 0.5-to-8.0 kHz swept frequency. Recorded trace lengths were approximately 250-ms. Trackline spacing varied from 40 meters in water depths less than 15 meters to 70-meter spacing in water depths greater than 15 meters. Shore perpendicular tracklines spacing ranged from 500 m to 1 km apart.

  2. How were the data generated, processed, and modified?

    Date: 2007 (process 1 of 4)
    A C program 'jsftosegy' (no version), developed by Tom O'Brien (USGS - Woods Hole Seafloor Mapping Group) was used to convert raw chirp traces in the Edgetech JSF format (acquired using EdgeTech J-Star software) to chirp-processed, envelope traces in the SEG-Y rev. 1 standard format.

    Person who carried out this activity:

    Dave Foster
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700x2271 (voice)
    5084572310 (FAX)
    dfoster@usgs.gov

    Date: 2007 (process 2 of 4)
    A script was executed using 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, filename, 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. An additional AWK script was then used to convert time of day (UTC) to individual fields of hour, minute and second. The unique shot navigation for each seismic line were then concatenated into a comma delimited (.csv) text file.

    Person who carried out this activity:

    Dave Foster
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700x2271 (voice)
    5084572310 (FAX)
    dfoster@usgs.gov

    Date: 2008 (process 3 of 4)
    The text file (*.csv) was imported into ESRI ArcMap 9.2 using Tools - Add XY Data and converted to an event theme. The event theme was then saved to a point shapefile and the projection was defined as Geographic Coordinate System, WGS84 (GCS_WGS_1984). The point shapefile was visually inspected for spurious data points and these data points were manually deleted.

    Person who carried out this activity:

    Dave Foster
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700x2271 (voice)
    5084572310 (FAX)
    dfoster@usgs.gov

    Date: 2008 (process 4 of 4)
    A 'Cruise ID' field was added to the attribute table within ArcMap 9.2. The field was populated with the Cruise ID (USGS 07011) using the field calculator.

    Person who carried out this activity:

    Jane Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700x2311 (voice)
    5084572310 (FAX)
    jdenny@usgs.gov

  3. What similar or related data should the user be aware of?

    Stockwell, John, 2007, Seismic Un*x: Center for Wave Phenomena - Colorado School of Mines, Golden, CO.

    Online Links:

    Norris, Michael W., and Faichney, Alan K., 2002, SEGY Rev.1 Data exchange Format1: Society of Exploration Geophysicists, Tulsa, OK.

    Online Links:

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    All attributes were evaluated during processing as standard quality control to ensure attributes contain accurate and relevant information and values.

  2. How accurate are the geographic locations?

    The EdgeTech SB-0512i was towed approximately 5 meters astern and approximately 1.5 meters below the sea surface. A GPS navigation receiver was mounted on the seismic sled to provide seismic navigation. GPS positions were sent, via radio modem, to a receiver positioned on the aft roof of the acquisition van aboard the R/V Megan Miller. GPS positions were sent directly to the EdgeTech J-Star seismic acquisition software. The horizontal accuracy of GPS is assumed to be ± 10 m (<http://www.navcen.uscg.gov/>).

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    Unique shot point navigation for all seismic data were evaluated and all valid data were included in the shot point navigation file. Line 92 was saved as l91f1_001 during acquisition.

  5. How consistent are the relationships among the observations, including topology?

    Unique shot point navigation was evaluated (i.e. quality control) during processing and all spurious data points were removed.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
Use_Constraints:
The U.S. Geological Survey asks to be referenced as the originator of the dataset in any future publications.

  1. Who distributes the data set? (Distributor 1 of 1)

    Jane Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700x2311 (voice)
    5084572310 (FAX)
    jdenny@usgs.gov

  2. What's the catalog number I need to order this data set?

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    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.

  4. How can I download or order the data?

  5. Is there some other way to get the data?

    Digital copies of these chirp seismic data may also be obtained in the SEG-Y Rev. 1 standard format upon request. The data would be packaged on DVD, and contain the chirp-processed, envelope traces.

  6. What hardware or software do I need in order to use the data set?

    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.

Who wrote the metadata?

Dates:
Last modified: 05-Oct-2009
Last Reviewed: 2009
Metadata author:
Jane Denny
U.S. Geological Survey
Geologist
384 Woods Hole Rd.
Woods Hole, MA 02543-1598

(508) 548-8700x2311 (voice)
5084572310 (FAX)
jdenny@usgs.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.8.25 on Mon Oct 05 15:34:29 2009