02031 - Geophysical Surveys of Bear Lake, Utah-Idaho, September 2002 - Shot Point Navigation 500 shot interval (CHRP_500)

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Frequently anticipated questions:

What does this data set describe?

Title:
02031 - Geophysical Surveys of Bear Lake, Utah-Idaho, September 2002 - Shot Point Navigation 500 shot interval (CHRP_500)
Abstract:
Bear Lake is a tectonic lake that has existed for at least several hundred thousand years. The lake basin is a relatively simple half graben, a spoon-shaped depression tilted toward the main fault on the east side of the lake. The U.S. Geological Survey, in cooperation with researchers from several universities, has been studying the sediments of Bear Lake since 1996. The general purpose of this effort is to reconstruct past limnological conditions and regional climate on a range of timescales, from hundreds of years to hundreds of thousands of years. This research relates to a variety of human concerns, including water usage in the Bear River basin. Past work has included several coring operations, a seismic-reflection survey, sediment-trap deployments, a barge-mounted drilling operation with the GLAD800 drill rig, and a variety of other studies. The objectives of the September, 2002 operations, preliminarily reported here, were (1) to compile a detailed bathymetric map of the lake using swath-mapping techniques, in order to provide baseline data for a variety of applications and studies, and (2) to complete a sidescan-sonar survey of the lake, providing a nearly complete acoustic image of the lake floor. Limited amounts of subbottom acoustic-reflection data (chirp) were also collected, along with samples of lake-floor sediments representative of different kinds of backscatter patterns. These surveys followed an earlier subbottom acoustic-reflection survey (1997), using boomer and 3.5 kHz systems (S. M. Colman, unpublished data).
  1. How might this data set be cited?
    Denny, Jane F., 2003, 02031 - Geophysical Surveys of Bear Lake, Utah-Idaho, September 2002 - Shot Point Navigation 500 shot interval (CHRP_500): 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, J.F., and Colman, S.M., 2003, Geophysical Surveys of Bear Lake, Utah-Idaho, September, 2002: Open-File Report 03-150, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -111.5
    East_Bounding_Coordinate: -111.17
    North_Bounding_Coordinate: 42.2
    South_Bounding_Coordinate: 41.08
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 04-Sep-2002
    Ending_Date: 16-Sep-2002
    Currentness_Reference:
    publication date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: digital vector 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):
      • point (240)
    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 0.000089992. Longitudes are given to the nearest 0.000089992. Latitude and longitude values are specified in decimal degrees. The horizontal datum used is WGS84.
      The ellipsoid used is WGS84.
      The semi-major axis of the ellipsoid used is 6378137.0000000.
      The flattening of the ellipsoid used is 1/298.26.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: Assumed sea level
      Altitude_Resolution: 1
      Altitude_Distance_Units: Two-way travel time
      Altitude_Encoding_Method: Attribute values
      Depth_System_Definition:
      Depth_Datum_Name: Local surface
      Depth_Resolution: 1
      Depth_Distance_Units: Meters
      Depth_Encoding_Method: Attribute values
  7. How does the data set describe geographic features?
    Seismic Shot Point Navigation
    Shapefile Attribute Table (Source: ArcView 3.2)
    FID
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Shape
    internal ArcView 3.2 ID (Source: ArcView 3.2) ArcView 3.2
    LON
    Information unavailable from original metadata. (Source: Information unavailable from original metadata.) Information unavailable from original metadata.
    LAT
    Information unavailable from original metadata. (Source: Information unavailable from original metadata.) Information unavailable from original metadata.
    LINE
    Information unavailable from original metadata. (Source: Information unavailable from original metadata.) Information unavailable from original metadata.
    SHOT
    Information unavailable from original metadata. (Source: Information unavailable from original metadata.) Information unavailable from original metadata.
    Lon
    X coordinate in Geographic Coordinate System (Source: Geographic Coordinate System)
    Range of values
    Minimum:-111.5
    Maximum:-111.17
    Lat
    y-Coordinate in Geographic Coordinate System (Source: Geographic Coordinate System)
    Range of values
    Minimum:41.08
    Maximum:42.2
    YEAR
    Information unavailable from original metadata. (Source: Information unavailable from original metadata.) Information unavailable from original metadata.
    Line
    Line Number (Source: data set) Line Number
    Shot
    Shot Point Number (Source: data set) Shot Point Number
    UTMX
    X Coordinate; UTM, Zone 12 (Source: data set)
    Range of values
    Minimum:450000
    Maximum:480000
    UTMY
    Y-Coordinate; UTM, Zone 12 (Source: data set)
    Range of values
    Minimum:4500000
    Maximum:4700000
    Year
    Calendar Date (Source: Calendar) Calendar Date
    JD_HR_MIN_
    Time - Julian Day, Hour, Minute, Second (Source: Calendar Date) Calendar Date

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Jane F. Denny
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Jane F. Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

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

Why was the data set created?

These data represent the shot point navigation data for the seismic-reflection systems utilized during U.S. Geological Survey geophysical research cruises.

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: 2003 (process 1 of 5)
    The seismic shot navigation is received by the differential GPS system (WAAS), sent directly to the seismic acquisition system, and recorded in the SEG-Y header of each file. The navigation is later extracted from the SEG-Y header and resampled at 500 shot interval using the UNIX awk command (retaining the start and end of each file). The file is then converted from its native UTM projection (zone 18, units meters, WGS84 datum) to Geographic Coordinate System, and formatted into a comma-delimited ASCII file. This file is imported into ArcView 3.2 as a table. The table is then converted into a point shapefile. Person who carried out this activity:
    Jane F. Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2311 (voice)
    (508) 457-2310 (FAX)
    jdenny@usgs.gov
    Date: 13-Jul-2016 (process 2 of 5)
    Edits to the metadata were made to fix any errors that MP v 2.9.32 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). The link to the data in the Distribution_Information section had to be added. Other distribution information had to be added to meet the standard. Minor fixes to the attribute format for some attributes were needed. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 20-Jul-2018 (process 3 of 5)
    USGS Thesaurus keywords added to the keyword section. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 18-Nov-2019 (process 4 of 5)
    Crossref DOI link was added as the first link in the metadata. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 08-Sep-2020 (process 5 of 5)
    Added keywords section with USGS persistent identifier as theme keyword. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@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?
  2. How accurate are the geographic locations?
    WAAS (Wide Area Augmentation System) Navigation was used to acquire navigation information. WAAS is considered to have a horizontal accuracy of < 3 meters. The chirp tow-vehicle was towed at the surface, next to the vessel. WAAS positioning was recorded in the SEGY header of the seismic data. Navigation of the seismic tow-vehicle is assumed to be +/- 5 meters.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Complete
  5. How consistent are the relationships among the observations, including topology?
    These navigation data have been stripped from the header of seismic SEG-Y data. They have been quality checked by comparing these data to navigation data acquired during cruise operations.

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 must be referenced as the originator of the dataset in any future publications.
  1. Who distributes the data set? (Distributor 1 of 1)
    Jane F. Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    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?
    This publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data published on this CD-ROM have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and/or the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    The 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.

Who wrote the metadata?

Dates:
Last modified: 08-Sep-2020
Metadata author:
Jane F. Denny
U.S. Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA
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)
This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/open_file_report/ofr2003-150/02031_chrp_500.shp.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:20:18 2021