Raw data files for single-beam bathymetry data of field activity 90027 (F-8-90-NC) in Gulf of Farallones, Northern California from 08/05/1990 to 08/17/1990

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Frequently anticipated questions:


What does this data set describe?

Title:
Raw data files for single-beam bathymetry data of field activity 90027 (F-8-90-NC) in Gulf of Farallones, Northern California from 08/05/1990 to 08/17/1990
Abstract:
Single-beam bathymetry data along with DGPS navigation data was collected as part of the U.S. Geological Survey cruise 1990-027-FA. The cruise was conducted in Gulf of Farallones, Northern California from August 5 to August 17, 1990. The chief scientists were Herman Karl , Dave Drake, and Bill Schwaball from the USGS Coastal and Marine Geology office in Menlo Park, CA. The geophysical source was a Knudsen 12 kHz 320B/R echosounder. These data are reformatted from space-delimited ASCII text files located in the Coastal and Marine Geology Program (CMGP) InfoBank field activity catalog at http://walrus.wr.usgs.gov/infobank/f/f890nc/html/f-8-90-nc.bath.html
Supplemental_Information:
The navigation data are digitally collected using a Differential Global Positioning System (DGPS) Professional mx400. The DGPS is a space-based satellite navigation system maintained by the United States government and is accessible using a GPS receiver. The DGPS provides navigational accuracy of approximately 5 m.The Data Acquistion, Processing, and Storage (DAPS) group performs a number of processing steps to the navigation data once it is collected which can vary by cruise. These steps are outlined within the header information in each individual digital navigation (.0xx, .6xx) space-delimited ASCII data file. The header information rows are indicated by lines beginning with the character "!". The single-beam bathymetry data are collected both digitally and as analog records with a 12.5 kHz Knudsen model 320B/R echo sounder. Bathymetry data was commonly processed using three programs. Batred calculates depth from travel times; nosamebathy eliminates identical adjacent bathymetry values; and nozerobathy removes records with a depth value of "0.0". However, not all of the datasets included in this report were processed with one or all of these programs. If the data was not run through these programs it was reformatted using the most recent "best file" on InfoBank, often these were categorized by InfoBank as raw bathymetry files. Details about which processing steps were taken by the DAPS group can be found in the header information of the bathymetry and navigation ASCII files downloaded from InfoBank.Prior to reformatting the data into MGD77T format the "best" bathymetry and navigation files from InfoBank were edited to remove the header information and reformatted using Excel 2010 to separate the data into columns based on tabs. Next the bathymetry and navigation files were merged based on time and latitude and longitude. The combined navigation and bathymetry was saved as a .txt file.
  1. How might this data set be cited?
    U.S. Geological Survey, and Coastal and Marine Geology Program, 2012, Raw data files for single-beam bathymetry data of field activity 90027 (F-8-90-NC) in Gulf of Farallones, Northern California from 08/05/1990 to 08/17/1990: U.S. Geological Survey, Menlo Park, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -123.53189
    East_Bounding_Coordinate: -122.20077
    North_Bounding_Coordinate: 38.07073
    South_Bounding_Coordinate: 37.16215
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 05-Aug-1990
    Ending_Date: 17-Aug-1990
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: tab-delimited ASCII text files
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      Indirect_Spatial_Reference: Gulf of Farallones, Northern California
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point
    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 1/298.25722210100002.
      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Local surface
      Depth_Resolution: 0.1
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Attribute values
  7. How does the data set describe geographic features?

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
    • Coastal and Marine Geology Program
  2. Who also contributed to the data set?
    John Cannan (Ship Captain); Matthew Gilbey (Chief Engineer); Albert Fuller (Chief Mate); Herman Karl (Chief Scientist, USGS Western Region); Michael Hamer (Navigator, USGS Western Region); Kaye Kinoshita (Navigator, USGS Western Region); Frank Brown (Watchstander (volunteer), USGS Western Region); Greg Gabel (Watchstander, USGS Western Region); Hank Chezar (Photographer, USGS Western Region); Norman Maher (Geologist, USGS Western Region); John Chin (Geologist, USGS Western Region); Doug Musser (Geologist, USGS Western Region); Jesus Baraza (Geologist, USGS Western Region); Brian Edwards (Geologist, USGS Western Region); Jim Vaughan (Electrical Engineer, USGS Western Region); Kevin O'Toole (Mechanical Technician, USGS Western Region); Hal Williams (Mechanical Technician, USGS Western Region); Alan Ota (Unspecified Investigator, EPA); Colleen Petrullo (Unspecified Investigator, EPA); Jon Stern (Unspecified Investigator); Steve Bailey (Unspecified Investigator, California Academy of Science); Isidore Szcznakiak (Unspecified Investigator, California Academy of Science); Paul Jones (Unspecified Investigator, EPA); Warren Scherfius (Unspecified Investigator); Steve Wessels (Unspecified Investigator); Greg Gabel (Watchstander, USGS Western Region); Ronald Kistler (Geologist, USGS Western Region); Duane Champion (Geologist, USGS Western Region); Don Roberson (Unspecified Investigator (volunteer), EPA); Catherine Courtney (Unspecified Investigator, PRC); John Evans (Unspecified Investigator, SAIC); Brigitte Hilbig (Unspecified Investigator, SAIC); Jim Blake (Unspecified Investigator, SAIC); Rob Williams (Unspecified Investigator, SAIC); Gene Revelas (Unspecified Investigator, SAIC)
  3. To whom should users address questions about the data?
    Gregory K, Miller
    U.S. Geological Survey
    Physical Scientist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 803-8747, ext. 3020 (voice)
    gmiller@usgs.gov

Why was the data set created?

These data and information are intended for science researchers,students, policy makers, and general public. These data are not to be used for navigation purposes. The data are reformatted into MGD77T standard format for inclusion into NOAA's NGDC geophysical database. From there the data will be made available to GeoMapApp (http://www.geomapapp.org/) and Virtual Ocean (http://www.virtualocean.org/) Earth-browsing software. Access to the data is also provided via the USGS Coastal and Marine Geoscience Data System (http://cmgds.marine.usgs.gov/).

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: 31-Oct-2000 (process 1 of 3)
    Navigation Data Converted to time format with year at start. 11/06/90 MHAMER DRS$DATA:[F890NC.N]F890NC.052;1 DUA0:[DRS.PLT.NAVED.EXE]NAVED.EXE; Integrated navigation (SINS) data CLEANED UP NAVIGATION AS OF 11/6/90. THIS IS THE FINAL VERSION WHICH HAS BEEN CLEANED FOR THE 3.5 KHZ LINES AND CAMERA STATIONS. Person who carried out this activity:
    U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
    Attn: Carolyn H. Degnan
    Geophysicist
    USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
    Santa Cruz, CA
    USA

    (831) 460-7452 (voice)
    (831) 427-4748 (FAX)
    infobank@octopus.wr.usgs.gov
    Date: 31-Oct-1998 (process 2 of 3)
    Bathymetry Data >10/31/1998 /lion/f/f890nc/bath/f-8-90-nc.300_052 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >11/30/90 CAROLYN DRS$DATA:[F890NC.B]F890NC.300;1 >DUA0:[DATA.][F790NC.B]REF.EXE; >Raw depth (bathymetry) data >from file DRS$DATA:[F890NC.B]RAWDEP_OUT.;1 > >Input was... >Converted to time format with year at start. > >11/06/90 MHAMER DRS$DATA:[F890NC.N]F890NC.052;1 >DUA0:[DRS.PLT.NAVED.EXE]NAVED.EXE; >Integrated navigation (SINS) data >CLEANED UP NAVIGATION AS OF 11/6/90. THIS IS THE FINAL VERSION WHICH >HAS BEEN CLEANED FOR THE 3.5 KHZ LINES AND CAMERA STATIONS. > >time, lat, long, time(sec) to nearest nav fix, data values Person who carried out this activity:
    U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
    Attn: Carolyn H. Degnan
    Geophysicist
    USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
    Santa Cruz, CA
    USA

    (831) 460-7452 (voice)
    (831) 427-4748 (FAX)
    infobank@octopus.wr.usgs.gov
    Date: 01-Feb-2017 (process 3 of 3)
    Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Alan O. Allwardt
    Contractor -- Information Specialist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7551 (voice)
    831-427-4748 (FAX)
    aallwardt@usgs.gov
  3. What similar or related data should the user be aware of?
    Karl, H.A., Drake, D.E., Schwab, W.C., Edwards, B.D., Lee, H.J., and Chin, J.L., 1990, Progress Report on Status of Analysis and Interpretation of Data Collected on Cruises F-7-90-NC and F-8-90-NC Farallon Escarpment, 19 July to 3 August and 5 to 17 August, 1990: U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details: 35 p.
    Hittelman, Allen M., Groman, Robert C., Haworth, Richard T., Holcombe, Troy L., McHendrie, Graig, Smith, Stuart M., and Metzger, Dan R., 2010, The marine geophysical data exchange format - MGD77 / MGD77T: National Geophysical Data Center, National Oceanic and Atmospheric Administration, Boulder, CO.

    Online Links:

    Other_Citation_Details: 25 p.

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

  1. How well have the observations been checked?
    The validity or accuracy of bathymetry and navigation data is highly qualitative and depends on equipment and operating condition variables. Data quality is unknown, MGD77T files were formatted from InfoBank files identified as best available version.
  2. How accurate are the geographic locations?
    Unspecified
  3. How accurate are the heights or depths?
    Unspecified
  4. Where are the gaps in the data? What is missing?
    Start and end date/times of data Navigation Data (f-8-90-nc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athymetry Data (f-8-90-nc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
  5. How consistent are the relationships among the observations, including topology?
    This data set is from one field activity with unknown instrument calibrations. Processed bathymetric depths were spot checked based on latitude and longitude against the Global Multi-Resolution Topography (GMRT) grid within GeoMapApp to ensure reasonable values.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None. These data are held in the public domain.
Use_Constraints:
This information is not intended for navigational purposes.Read and fully comprehend the metadata prior to data use. Uses of thesedata should not violate the spatial resolution of the data. Wherethese data are used in combination with other data of different resolution,the resolution of the combined output will be limited by the lowestresolution of all the data.Acknowledge the U.S. Geological Survey in products derived from these data.Share data products developed using these data with the U.S. GeologicalSurvey.

Who wrote the metadata?

Dates:
Last modified: 01-Feb-2017
Metadata author:
Gregory K. Miller
U.S. Geological Survey
Physical Scientist
U.S. Geological Survey, 600 Fourth Street South
St. Petersburg, FL
USA

(727) 803-8747, ext. 3020 (voice)
gmiller@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/789.faq.html>
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