08016_Chirp_100SHT.SHP: Shot point navigation at 500-shot intervals collected by the U.S. Geological Survey within the St. Clair River between Michigan and Ontario, Canada, 2008 (ESRI VECTOR SHAPEFILE)

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Frequently-anticipated questions:

What does this data set describe?

Title:
08016_Chirp_100SHT.SHP: Shot point navigation at 500-shot intervals collected by the U.S. Geological Survey within the St. Clair River between Michigan and Ontario, Canada, 2008 (ESRI VECTOR SHAPEFILE)
Abstract:
In 2008, the U.S. Geological Survey (USGS), Woods Hole Coastal and Marine Science Center (WHCMSC), in cooperation with the U.S. Army Corps of Engineers conducted a geophysical and sampling survey of the riverbed of the Upper St. Clair River between Port Huron, MI, and Sarnia, Ontario, Canada. The objectives were to define the Quaternary geologic framework of the St. Clair River to evaluate the relationship between morphologic change of the riverbed and underlying stratigraphy. This report presents the geophysical and sample data collected from the St. Clair River, May 29-June 6, 2008 as part of the International Upper Great Lakes Study, a 5-year project funded by the International Joint Commission of the United States and Canada to examine whether physical changes in the St. Clair River are affecting water levels within the upper Great Lakes, to assess regulation plans for outflows from Lake Superior, and to examine the potential effect of climate change on the Great Lakes water levels ( <http://www.iugls.org>). This document makes available the data that were used in a separate report, U.S. Geological Survey Open-File Report 2009-1137, which detailed the interpretations of the Quaternary geologic framework of the region. This report includes a description of the suite of high-resolution acoustic and sediment-sampling systems that were used to map the morphology, surficial sediment distribution, and underlying geology of the Upper St. Clair River during USGS field activity 2008-016-FA . Video and photographs of the riverbed were also collected and are included in this data release. Future analyses will be focused on substrate erosion and its effects on river-channel morphology and geometry. Ultimately, the International Upper Great Lakes Study will attempt to determine where physical changes in the St. Clair River affect water flow and, subsequently, water levels in the Upper Great Lakes.
  1. How should this data set be cited?

    U.S. Geological Survey, 2010, 08016_Chirp_100SHT.SHP: Shot point navigation at 500-shot intervals collected by the U.S. Geological Survey within the St. Clair River between Michigan and Ontario, Canada, 2008 (ESRI VECTOR SHAPEFILE): Open-File Report 2010-1035, 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.

    Denny, Jane F. , Foster, David S. , Worley, Charles R. , and Irwin, Barry J. , 2010, Geophysical data collected from the St. Clair River between Michigan and Ontario, Canada, 2008-016-FA: Open-File Report 2010-1035, U.S. Geological Survey, Woods Hole Coastal and Marine Science Center.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -82.513954
    East_Bounding_Coordinate: -82.402206
    North_Bounding_Coordinate: 43.014789
    South_Bounding_Coordinate: 42.655590

  3. What does it look like?

    <https://pubs.usgs.gov/of/2010/1035/gis_catalog/tracklines/chirp_500sht_sm.jpg> (JPEG)
    Thumbnail image of shot point navigation for Chirp seismic-reflection system

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

    Beginning_Date: 29-May-2008
    Beginning_Time: 20080601
    Ending_Date: 30-May-2008
    Ending_Time: 20080602
    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 (271)

    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?

    08016_Chirp_500sht
    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, 17N, WGS84, meters (Source: U.S. Geological Survey)

    Range of values
    Minimum:375913.25
    Maximum:385723.08
    Units:meters

    North
    North coordinate in UTM, 17N, WGS84, meters (Source: U.S. Geological Survey)

    Range of values
    Minimum:4723670.96
    Maximum:4763435.36
    Units:meters

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

    Range of values
    Minimum:-82.513954
    Maximum:82.402206
    Units:decimal degrees

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

    Range of values
    Minimum:42.65559
    Maximum:43.014789
    Units:decimal degrees

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

    Naming convention for SEG-Y Chirp data. Format: 0001_150_1424_3.5kHz_000, where '0001' is line number, '_150' is julian day, '_1424' is start time in hours and minutes, '_3.5kHz' is frequency of system, and '000' is system file name (default)

    Shotnum
    Shot number at 500-shot intervals (Source: U.S. Geological Survey)

    Range of values
    Minimum:500
    Maximum:65500
    Units:shot

    Year
    Calendar year of data acquisition (Source: U.S. Geological Survey)

    ValueDefinition
    2008Calendar year of data acquisition for USGS cruise 08016 (2008)

    Jday
    Julian Day of data acqusition (year: 2008) with day 1 equal to January 1, 2008 (Source: U.S. Geological Survey)

    Range of values
    Minimum:150
    Maximum:154
    Units:Julian day

    Hr
    Hour of data acquisition (24-hr clock: UTC) (Source: U.S. Geological Survey)

    Range of values
    Minimum:12
    Maximum:19
    Units:hour (24-hr: UTC)

    Min
    Minute of data acquisition (24-hr clock: UTC) (Source: U.S. Geological Survey)

    Range of values
    Minimum:0
    Maximum:59
    Units:minute (24-hr clock, UTC)

    Sec
    second of data acquisition (24-hr clock: UTC) (Source: U.S. Geological Survey)

    Range of values
    Minimum:0
    Maximum:59
    Units:second (24-hr clock, UTC)

    Cruise_ID
    USGS Cruise identification (Source: U.S. Geological Survey)

    ValueDefinition
    08016USGS Cruise Identification Number, where the first two digits represent the calendar year and the last three digits represent the cruise identification 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 Road
    Woods Hole, MA 02543
    USA

    508-548-8700 x2311 (voice)
    508-457-2310 (FAX)
    jdenny@usgs.gov

Why was the data set created?

This data set contains shot point navigation at 500 shot intervals for approximately 80 km of Chirp data collected by the U.S. Geological Survey during cruise 08016 within the St. Clair River between Michigan and Ontario, Canada, 2008. The shot point data are provided to correlate with the JPEG images of seismic profiles.

How was the data set created?

  1. From what previous works were the data drawn?

    (source 1 of 1)
    Source_Contribution:
    The Chirp sub-bottom profiler was deployed off the starboard side of the USGS R/V Rafael. Chirp sub-bottom profiles were collected using a dual-frequency (3.5 and 200 kHz) Knudsen Engineering Limited (KEL) Chirp 3200® system (Knudsen Engineering Limited, 2009). The single-beam water depths from the 200-kHz channel were logged together with navigation in ASCII format. Chirp sub-bottom data with a peak frequency of 3.5 kHz were recorded using Knudsen acquisition software, SounderSuite, in Society of Exploration Geophysicists Y (SEG-Y) format (Barry and others, 1975) with DGPS navigation logged to the SEG-Y file trace headers. The Chirp system was fired at a rate of 0.25 or 0.5 s. The trace length was set to 67 ms. The vertical resolution of this system is approximately 30 cm. A total of 80 km of sub-bottom data were collected

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

    Date: 2008 (process 1 of 3)
    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 in arc seconds (WGS84) were converted to UTM zone 17 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 intervals of every 500 shot point locations retaining the last shot of each line. The 100 shot interval navigation for each seismic line were then concatenated into a comma delimited (.csv) text file.

    Seismic Unix 4.1; Proj 4.6.0

    Person who carried out this activity:

    U.S. Geological Survey
    c/o David Foster
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543
    USA

    508-548-8700 x 2271 (voice)
    508-457-2310 (FAX)
    dfoster@usgs.gov

    Date: 2008 (process 2 of 3)
    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).

    Person who carried out this activity:

    David Foster
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543
    USA

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

    Date: 2010 (process 3 of 3)
    'Cruise ID' field was added to the attribute table within ArcMap 9.2. The field was populated with the Cruise ID (08016) using the Field Calculator.

    Person who carried out this activity:

    Jane Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543
    USA

    508-548-8700 x 2311 (voice)
    508-457-2310 (FAX)
    jdenny@usgs.gov

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

    Foster, David S. , and Denny, Jane F. , 2009, Quaternary Geologic Framework of the St. Clair River between Michigan and Ontario, Canada: Open-File Report 2009-1137, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

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

    Online Links:

    Barry, K.M., Cavers, D.A., and Kneale, C.W., 1975, Report on recommended standards for digital tape formats: Geophysics v. 40, no. 02, p. 344-352., Society of Exploration Geophysicists (SEG), Houston, TX.

    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?

    Differential Global Positioning System (DGPS) navigation data were acquired with a Communications Systems International (CSI), Inc. LGBX Pro receiver and sent to Knudsen acquisition software, SounderSuite, where Chirp sub-bottom data with a peak frequency of 3.5 kHz were recorded in Society of Exploration Geophysicists Y (SEG-Y) format (Barry and others, 1975) with DGPS logged to the SEG-Y trace headers.

    DGPS accuracy is 1 to 3 meters, depending on the distance from a US Coast Guard coastal repeater station (<http://www.navcen.uscg.gov/>). DGPS accuracy is 1 to 3 meters, depending on the distance from a US Coast Guard coastal repeater station (<http://www.navcen.uscg.gov/>).

  3. How accurate are the heights or depths?

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

    Valid shot point navigation at 500-shot intervals for all Chirp seismic data were used to generate this shapefile.

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

    Seismic shot-point navigation was generated from unique shot navigation for the seismic system. The unique shot navigation data were evaluated during processing for spurious points; all spurious points were removed prior to generating the trackline navigation. 500-shot point navigation was generated from the unique shot navigation.

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 as the originator of the dataset.

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

    Jane Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543
    USA

    508-548-8700 x2311 (voice)
    508-457-2310 (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. 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 and a comma separated value (*csv) file containing unique shot point navigation. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the data file and a program capable of reading a *csv 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: 25-Jan-2011
Metadata author:
U.S. Geological Survey
c/o Jane F. Denny
Geologist
384 Woods Hole Road
Woods Hole, MA 02543
USA

508-548-8700 x2311 (voice)
508-457-2310 (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 Tue Jan 25 17:13:05 2011