08034_KELNAV500.SHP: Shot-Point Navigation (500 Shot Interval) for the Chirp High-Resolution Seismic-Reflection Profiles Collected During U.S. Geological Survey (USGS) R/V Rafael Cruise 08034 off Edgartown, Massachusetts

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Frequently-anticipated questions:

What does this data set describe?

Title:
08034_KELNAV500.SHP: Shot-Point Navigation (500 Shot Interval) for the Chirp High-Resolution Seismic-Reflection Profiles Collected During U.S. Geological Survey (USGS) R/V Rafael Cruise 08034 off Edgartown, Massachusetts
Abstract:
The U.S. Geological Survey (USGS), in cooperation with the National Oceanic and Atmospheric Administration (NOAA) and the Massachusetts Office of Coastal Zone Management (MA CZM), is producing detailed geologic maps of the coastal sea floor. Imagery, originally collected by NOAA for charting purposes, provides a fundamental framework for research and management activities along this part of the Massachusetts coastline, shows the composition and terrain of the seabed, and provides information on sediment transport and benthic habitat. Interpretive data layers were derived from the combined single-beam and multibeam echo-sounder data and sidescan-sonar data collected in the vicinity of Edgartown Harbor, Massachusetts. During August 2008 seismic-reflection profiles (Boomer and Chirp) were acquired, and during September 2008 bottom photographs and surficial sediment data were acquired as part of two ground-truth reconnaissance surveys.
  1. How should this data set be cited?

    Poppe, Larry, 2009, 08034_KELNAV500.SHP: Shot-Point Navigation (500 Shot Interval) for the Chirp High-Resolution Seismic-Reflection Profiles Collected During U.S. Geological Survey (USGS) R/V Rafael Cruise 08034 off Edgartown, Massachusetts: Open-File Report 2009-1001, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Poppe, L.J., McMullen, K.Y., Foster, D.S., Blackwood, D.S., Williams, S.J., Ackerman, S.D., Moser, M.S., and Glomb, K.A., 2010, Geological Interpretation of the Sea Floor Offshore of Edgartown, Massachusetts: Open-File Report 2009-1001, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -70.550201
    East_Bounding_Coordinate: -70.432541
    North_Bounding_Coordinate: 41.444981
    South_Bounding_Coordinate: 41.385845

  3. What does it look like?

    <https://pubs.usgs.gov/of/2009/1001/data/seismic/kel/nav500/08034_kelnav500.gif> (GIF)
    Browse graphic showing location of Chirp high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.

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

    Beginning_Date: 19-Aug-2008
    Ending_Date: 20-Aug-2008
    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 (187)

    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?

    08034_kelnav500
    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.

    Line
    Line designation (Source: Scientist)

    Character string

    Shot
    Shot point number (Source: Processor)

    Range of values
    Minimum: 1
    Maximum: 14085
    Units: shot points
    Resolution: 1

    Distance
    Distance between shot points rounded to the nearest kilometer (i.e. 0) created during linear referencing (Source: Processor)

    Value Definition
    0 Distance between shot points rounded to one kilometer

    ID
    Internal feature number (Source: ESRI)

    Unique whole numbers that are automatically generated.

    X
    Longitude Coordinate, WGS84 (Source: Processor)

    Range of values
    Minimum: -70.550201
    Maximum: -70.432541
    Units: decimal degrees
    Resolution: 0.000001

    Y
    Latitude Coordinate, WGS84 (Source: Processor)

    Range of values
    Minimum: 41.385845
    Maximum: 41.444981
    Units: decimal degrees
    Resolution: 0.000001

    Entity_and_Attribute_Overview:
    Shot-point navigation data with shot points at the beginning and end of each line and with shot points every 500 shots along the line for the Chirp seismic-reflection data collected along five lines in the vicinity of Edgartown Harbor, offshore Massachusetts in geographic, WGS84.

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?

    Larry Poppe
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543
    USA

    508-548-8700 x2314 (voice)
    508-457-2310 (FAX)
    lpoppe@usgs.gov

Why was the data set created?

To release the shot-point navigation data with shot points at the beginning and end of each line and with shot points every 500 shots along the line for the Chirp seismic-reflection data collected along five lines in the vicinity of Edgartown Harbor, offshore Massachusetts in geographic, WGS84.

How was the data set created?

  1. From what previous works were the data drawn?

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

    Date: 20-Aug-2008 (process 1 of 5)
    High-resolution 3.5 kHz Chirp data were collected August 19-20 aboard the Research Vessel Rafael. The Chirp data were acquired digitally along 16 lines totaling approximately 56.1 km with a Knudsen Engineering Limited (KEL) Chirp 3200 shallow water system and KEL SounderSuite software v1.46. The Chirp trace data recorded with a ping rate of 0.5 seconds for 66 ms with a sample rate of 0.048 ms in standard SEG-Y format.

    Person who carried out this activity:

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

    508-548-8700 x2271 (voice)
    508-457-2310 (FAX)
    dfoster@usgs.gov

    Date: 10-Dec-2008 (process 2 of 5)
    The raw SEG-Y data were read into Promax R2003 processing software. Heave compensation data from the Teledyne TSS sensor (mounted on the transducer sidemount pole) were extracted from the SEG-Y headers and were used to apply a static shift to the trace data. A topmute above the sea floor was digitized and applied. An Automatic Gain Control (AGC) with a window length of 5 ms was applied. The processed data were written to a new SEG-Y file.

    Person who carried out this activity:

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

    508-548-8700 x2271 (voice)
    508-457-2310 (FAX)
    dfoster@usgs.gov

    Date: 10-Dec-2008 (process 3 of 5)
    A Unix shell script was run that used Seismic Unix 4.0 to read the processed SEG-Y files and extract shot number, horizontal position, year, day, and time of day from the headers. AWK was used to parse the ASCII data, add line and image name fields, and convert position in seconds of arc to decimal degrees. The ASCII file was filtered using Linux "sort" to keep only the unique horizontal positions output to a comma delimited file.

    Person who carried out this activity:

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

    508-548-8700 x2271 (voice)
    508-457-2310 (FAX)
    dfoster@usgs.gov

    Data sources produced in this process:
    • 08034_kelnav.txt

    Date: 19-Aug-2009 (process 4 of 5)
    The ASCII comma delimited shot point navigation data were imported and converted to a shapefile using the create feature class using X-Y table in ArcCatalog 9.2 and the coordinate system and datum were defined as geographic, WGS84.

    Person who carried out this activity:

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

    508-548-8700 x2271 (voice)
    508-457-2310 (FAX)
    dfoster@usgs.gov

    Data sources used in this process:
    • 08034_kelnav.txt

    Data sources produced in this process:

    • 08034_kelnav.shp

    Date: 24-Aug-2009 (process 5 of 5)
    A shot-point navigation file that has points at the beginning and end of each line with shot points every 500 shots along the line were created with ArcTools 9.2 Linear Referencing Tools using the shot point and shot line files created for the Chirp dataset. First, the file with unique shot-point positions was used to create a polyline file using an in-house utility, Convert Points to Line v.2. Under ArcToolbox, Linear Referencing Tools, a feature class was created with Create Routes with the polyline file as input and the measure source being length. Next, a polylineM file was created with Calibrate Routes using the route feature class created in the previous step and the unique shot-point position as input. The measure field associated with the polylineM file was Shot. The layer properties of the polylineM file and the Hatch Class definition was set to an interval of 500 (shots) and the end hatches were defined to create the start and end shots of each line. In ArcMap 9.2 a custom tool was created under Linear Referencing commands to convert hatches to graphics. XToolsPro was used to convert graphics to a shapefile. The attributes Line and Shot were added to the event table properties using Locate Features Along Routes. The resulting DBF file was converted to an event feature using Make Route Event Layer using Line as the route identifier and shot as the measure field. The event feature was added to the ArcMap data frame and exported to a shapefile. Finally, the attributes were sorted using line as the primary field and shot as the secondary field using VAC Extras, Table Sort to make sure shot points were in sequential order.

    Person who carried out this activity:

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

    508-548-8700 x2271 (voice)
    508-457-2310 (FAX)
    dfoster@usgs.gov

    Data sources used in this process:
    • 08034_kelnav.shp
    • 08034_kelnavline.shp

    Data sources produced in this process:

    • 08034_kelnav500.shp

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

    O'Hara, C.J., and Oldale, R.N., 1987, Maps showing the geology, shallow structure, and bedform morphology of Nantucket Sound, Massachusetts: Miscellaneous Field Studies Map MF-1911, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Poppe, L.J., McMullen, K.Y., Foster, D.S., Blackwood, D.S., Williams, S.J., Ackerman, S.D., Barnum, S.R., and Brennan, R.T., 2008, Sea-floor character and sedimentary processes in the vicinity of Woods Hole, Massachusetts: Open-File Report 2008-1004, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

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

  1. How well have the observations been checked?

  2. How accurate are the geographic locations?

    Horizontal_Positional_Accuracy_Report: Navigation was by DGPS; positional accuracy to less than 10 m. The 3.5 kHz transducer was mounted on a pole mounted on the starboard side of the RV Rafael 0.6 m below the water surface. The distance from the transducer to the antenna was less than 3 m.

  3. How accurate are the heights or depths?

    The vertical position was local sea level and there have been no corrections to a datum or for tidal variations. A draft of 0.6 meters was applied to account for the transducer depth.

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

    Shot points at the beginning and end of each line and with shot points every 500 shots along the Chirp seismic acquisition lines collected during the RV Rafael cruise 08034 are included in this data set.

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

    No additional checks for consistency were performed on this data.

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:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.

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

    Larry Poppe
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    508-548-8700 x2314 (voice)
    508-457-2310 (FAX)
    lpoppe@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 the National Oceanic and Atmospheric Administration (NOAA), 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 or NOAA 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. What hardware or software do I need in order to use the data set?

    These data are available in Environmental Systems Research Institute (ESRI) 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 data. A free data viewer, ArcExplorer, capable of displaying the data is available from ESRI at www.esri.com. The user must have software capable of uncompressing archived zip files, such as WinZip or Pkware.

Who wrote the metadata?

Dates:
Last modified: 01-Oct-2009
Metadata author:
U.S. Geological Survey
c/o Larry Poppe
Geologist
384 Woods Hole Road
Woods Hole, MA 02543-1598
USA

508-548-8700 x2314 (voice)
508-457-2310 (FAX)
lpoppe@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 Thu Oct 01 13:22:55 2009