Bathymetry and Acoustic Backscatter of Crater Lake, Oregon from Field Activity: S-1-00-OR

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Frequently anticipated questions:


What does this data set describe?

Title:
Bathymetry and Acoustic Backscatter of Crater Lake, Oregon from Field Activity: S-1-00-OR
Abstract:
These data include high-resolution bathymetry and calibrated acoustic backscatter in XYZ ASCII and ArcInfo GRID format generated from the 2000 multibeam sonar survey of Crater Lake, Oregon.
Supplemental_Information:
Information for USGS Coastal and Marine Geology related activities are online at http://walrus.wr.usgs.gov/infobank/s/s100or/html/s-1-00-or.meta.html
  1. How might this data set be cited?
    Gardner, James V., and Dartnell, Peter, 2001, Bathymetry and Acoustic Backscatter of Crater Lake, Oregon from Field Activity: S-1-00-OR:.

    This is part of the following larger work.

    Gardner, James V., and Dartnell, Peter, 2001, 2000 Multibeam Sonar Survey of Crater Lake, Oregon: Data, GIS, Images, and Movies: U.S. Geological Survey Digital Data Series 72.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -122.16555054
    East_Bounding_Coordinate: -122.04983558
    North_Bounding_Coordinate: 42.97851439
    South_Bounding_Coordinate: 42.90490823
  3. What does it look like?
    http://pubs.usgs.gov/dds/dds-72/site/images/cl-persp.img/cl-map.gif (GIF)
    Map view of Crater Lake, Oregon. Colored region is the lake floor whereas the gray region is the surrounding land. The distance across the width if the lake is approximately 9 kilometers (5.6 miles). The reds and yellows show the shallower depths of the lake, whereas the greens and blues show the deeper depths.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 28-Jul-2000
    Ending_Date: 03-Aug-2000
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: XYZ ASCII
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (13,246,103)
      It contains the following raster data types:
      • Dimensions 4137 x 4677, type Grid Cell
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 10
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -123.00000
      Latitude_of_Projection_Origin: 0.00000
      False_Easting: 0.00
      False_Northing: 0.00
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 2.0
      Ordinates (y-coordinates) are specified to the nearest 2.0
      Planar coordinates are specified in Meters
      The horizontal datum used is WGS84.
      The ellipsoid used is WGS84.
      The semi-major axis of the ellipsoid used is 6378137.00 meters.
      The flattening of the ellipsoid used is 1/0.003352811.
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    Coordinates in the XYZ ASCII file are given in decimal degrees. Bathymetry is given in meters. Backscatter is an arbitrary scale ranging from 26 to 254.
    Sample of bathymetry XYZ ASCII file
    Longitude, Latitude, Elevation
    -122.11496,42.96909,1514.068
    -122.11494,42.96909,1514.674
    -122.11492,42.96909,1515.272
    -122.11490,42.96909,1515.862
    -122.11487,42.96909,1516.448
    -122.11485,42.96909,1517.026
    -122.11483,42.96909,1517.591
    -122.11481,42.96909,1518.141
    -122.11479,42.96909,1518.691
    
    Sample of Backscatter XYZ ASCII file
     Longitude, Latitude, DN Value
    -122.08681,42.95930,183.798
    -122.08679,42.95930,181.868
    -122.08677,42.95930,186.463
    -122.08675,42.95930,188.191
    -122.08673,42.95930,191.080
    -122.08670,42.95930,190.712
    -122.08668,42.95930,187.086
    -122.08666,42.95930,183.662
    -122.08664,42.95930,183.558
    
    Entity_and_Attribute_Detail_Citation: none
    Entity_and_Attribute_Overview:
    BATHY is an ArcInfo GRID with the following attributes:
    Data Type: Floating
    
    BOUNDARY (UTM meters)
    Xmin =  568119.572
    Xmax =  577473.572
    Ymin = 4750592.815
    Ymax = 4758866.815
    
    STATISTICS (grid cell values, elevation in meters)
    Minimum Value =      1289.1
    Maximum Value =      1881.0
    Mean          =      1529.6
    Standard Deviation =  180.0
    
    BACKSTR is an ArcInfo grid with the following attributes:
    Data Type: Floating
    
    BOUNDARY (UTM meters)
    Xmin =  568094.347
    Xmax =  577512.347
    Ymin = 4750342.202
    Ymax = 4758964.202
    
    STATISTICS (grid cell values, digital number)
    Minimum Value =       26.228
    Maximum Value =      253.965
    Mean          =      203.641
    Standard Deviation =  11.623
    
    Entity_and_Attribute_Detail_Citation: none

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • James V. Gardner
    • Peter Dartnell
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    James V. Gardner
    United States Geological Survey (USGS) Coastal and Marine Geology (CMG)
    Geologist
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA
    USA

    (650) 329-5469 (voice)
    (650) 329-5411 (FAX)
    jvgardner@usgs.gov

Why was the data set created?

These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) or other software to display bathymetry and backscatter data of Crater Lake, Oregon.

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: 03-Aug-2000 (process 1 of 2)
    The bathymetry and backscatter data were collected along a continuous swath perpendicular to the direction of the ship using a Kongsberg Simrad EM1002 multibeam sonar system. The data are cleaned of bad navigation and depth readings. The depth readings are gridded into a common grid. The gridded data are converted to an XYZ ASCII format file (Longitude, Latitude, Attribute). Person who carried out this activity:
    James V. Gardner
    United States Geological Survey (USGS) Coastal and Marine Geology (CMG)
    Geologist
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA
    USA

    (650) 329-5469 (voice)
    (650) 329-5411 (FAX)
    jvgardner@usgs.gov
    Date: 25-Apr-2001 (process 2 of 2)
    Creation of original metadata record Person who carried out this activity:
    Pete Dartnell
    United States Geological Survey (USGS) Coastal and Marine Geology (CMG)
    Physical Scientist
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA
    USA

    (650) 329-5460 (voice)
    (650) 329-5411 (FAX)
    pdartnell@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?
    0.5 meters
  3. How accurate are the heights or depths?
    0.05 percent of the water depth
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the observations, including topology?

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:
These data not intended for navigational purposes. Please recognize the U.S. Geological Survey (USGS) as the source of this information. USGS-authored or produced data and information are in the public domain. Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, these data and information are provided with the understanding that they are not guaranteed to be usable, timely, accurate, or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user. Neither the U.S. Government nor any agency thereof, 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 data, software, information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. Trade, firm, or product names and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy.
  1. Who distributes the data set? (Distributor 1 of 1)
    United States Geological Survey (USGS) Information Services
    Box 25286
    Denver, CO
    USA

    (888)ASK-USGS (voice)
  2. What's the catalog number I need to order this data set? S-00-OR data set
  3. What legal disclaimers am I supposed to read?
    These data not intended for navigational purposes. Please recognize the U.S. Geological Survey (USGS) as the source of this information. USGS-authored or produced data and information are in the public domain. Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, these data and information are provided with the understanding that they are not guaranteed to be usable, timely, accurate, or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user. Neither the U.S. Government nor any agency thereof, 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 data, software, information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. Trade, firm, or product names and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 13-Jun-2016
Metadata author:
Peter N Schweitzer
USGS Midwest Area
Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/
Mail Stop 954
12201 Sunrise Valley Dr
Reston, VA
USA

703-648-6533 (voice)
703-648-6252 (FAX)
pschweitzer@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://geo-nsdi.er.usgs.gov/metadata/digital-data/72/metadata.faq.html>
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