# CHIRP_TRK - Chirp Seismic navigation tracklines data collected by the U.S. Geological Survey offshore of the Grand Strand, South Carolina (Polyline)

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#### Frequently-anticipated questions:

- What does this data set describe?
  1. How should this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
- Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
- Why was the data set created?
- How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  3. What similar or related data should the user be aware of?
- 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?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
- How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
- Who wrote the metadata?

### What does this data set describe?

Title:
  CHIRP_TRK - Chirp Seismic navigation tracklines data collected by the U.S. Geological Survey offshore of the Grand Strand, South Carolina (Polyline)
Abstract:
  In 1999, the USGS, in partnership with the South Carolina Sea Grant Consortium, began a study to investigate processes affecting shoreline change along the northern coast of South Carolina, focusing on the Grand Strand region. Previous work along the U.S. Atlantic coast shows that the structure and composition of older geologic strata located seaward of the coast heavily influences the coastal behavior of areas with limited sediment supply, such as the Grand Strand. By defining this geologic framework and identifying the transport pathways and sinks of sediment, geoscientists are developing conceptual models of the present-day physical processes shaping the South Carolina coast. The primary objectives of this research effort are: 1) to provide a regional synthesis of the shallow geologic framework underlying the coastal upland, shoreface and inner continental shelf, and define its role in coastal evolution and modern beach behavior; 2) to identify and model the physical processes affecting coastal ocean circulation and sediment transport, and to define their role in shaping the modern shoreline; and 3) to identify sediment sources and transport pathways; leading to construction of a regional sediment budget.

1. How should this data set be cited?

   > U.S. Geological Survey, 2007, CHIRP_TRK - Chirp Seismic navigation tracklines data collected by the U.S. Geological Survey offshore of the Grand Strand, South Carolina (Polyline): Open-File Report 2005-1346, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

   > Online Links:

   > - <http://pubs.usgs.gov/of/2005/1346/ArcGIS/Tracklines/Chirp_trk.zip>

   This is part of the following larger work.

   > Baldwin, W.E., Denny, J.F., Schwab, W.C., Gayes, P.T., Morton, R.A., and Driscoll, N.W., 2007, Geologic Framework Studies of South Carolina's Long Bay from Little River Inlet to Winyah Bay, 1999-2003; geospatial data release: Open-File Report 2005-1346, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

   > Online Links:

   > - <http://pubs.usgs.gov/of/2005/1346/>

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -79.158320
   East_Bounding_Coordinate: -78.516267
   North_Bounding_Coordinate: 33.854943
   South_Bounding_Coordinate: 33.143861

3. What does it look like?

   <http://pubs.usgs.gov/of/2005/1346/images/chirp_trk.jpg> (JPEG)
     Boomer tracklines offshore of the Grand Strand, SC

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

   Beginning_Date: 29-Oct-1999, 20000313, 20010501, 20020501, 20020603, 20030501
   Ending_Date: 12-Nov-1999, 20000330, 20010515, 20020522, 20020618, 20030521
   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):

      - String (734)

   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?

   `chirp_trk`
     ESRI polyline shapefile (Source: ESRI)

     `Shape`
       Feature geometry. (Source: ESRI)

       Coordinates defining the features.

     `FID`
       Internal feature number. (Source: ESRI)

       Sequential unique whole numbers that are automatically generated.

     `Cruise`
       WHSC Field activity serial number assigned to identify cruise (Source: USGS)

       Character string

     `LINE`
       Line name assigned for identification purposes (Source: USGS)

       Character string containing number and file of line (e.g. line 1 file1 = l1f1).

     `HyperLink`
       Relative path to JPG images of profiles for hyperlinking (Source: USGS)

       Character string

### Who produced the data set?

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

   - U.S. Geological Survey

2. Who also contributed to the data set?

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

   U.S. Geological Survey
   c/o Jane Denny
   Geologist
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   USA

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

### Why was the data set created?

> This data set contains tracklines for chirp seismic system acquired by the U.S. Geological Survey during geophysical cruises offshore of the Grand Strand, SC.

### 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: 2004 (process 1 of 1)
     Navigation was extracted from the seismic data (raw SEG-Y format) and formatted for input to ArcGIS.

     Person who carried out this activity:

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

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

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

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

1. How well have the observations been checked?

   All systems were navigated using Differential GPS. Horizontal accuracy is assumed to be 2 m.

2. How accurate are the geographic locations?

   All systems were navigated using Differential GPS. Horizontal accuracy is assumed to be 2 m.

3. How accurate are the heights or depths?

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

   All chirp seismic-reflection navigation data collected during USGS field efforts offshore of Myrtle Beach, SC 1999 – 2003 are included.

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

   No additional checks for topological consistency were performed on the 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 as the originator of the dataset.

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

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

   508-548-8700 (voice)
   508-457-2310 (FAX)

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

   `Downloadable Data`

3. What legal disclaimers am I supposed to read?

   > Although all data have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. 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?

   - Availability in digital form:

     Data format: | Shapefile contains seismic tracklines offshore of the Grand Strand, SC in format SHP (version ArcGIS 9.0) ESRI polyline shapefile Size: 5.906
     Network links: | <http://pubs.usgs.gov/of/2005/1346/ArcGIS/Tracklines/Chirp_trk.zip>
     Media you can order: | DVD-ROM (Density 4.75 Gbytes) (format UDF)

   - Cost to order the data: none

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) polyline 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: 23-Jan-2007
Metadata author:
  Jane Denny
  U.S. Geological Survey
  Geologist
  384 Woods Hole Road
  Woods Hole, MA 02543-1598
  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)

Generated by `mp` version 2.9.2 on Tue Mar 06 14:40:58 2007