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

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:
XYZ ASCII format data generated from the 2000 multibeam sonar survey of Crater Lake, Oregon. The data include high-resolution bathymetry and calibrated acoustic backscatter. Data are also available in ArcInfo GRID format (see data download page of https://doi.org/10.3133/ds72)
Supplemental_Information:
Additional information about the field activities from which this data set was derived are available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=S100OR
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology.
  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: Digital Data Series 72, U.S. Geological Survey, Coastal and Marine Geology Program, Menlo Park, CA.

    Online Links:

    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: Digital Data Series 72, U.S. Geological Survey, Coastal and Marine Geology Program, Menlo Park, CA.

    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?
  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)
    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 2.0. Longitudes are given to the nearest 2.0. 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 6378137.00.
      The flattening of the ellipsoid used is 1/0.003352811.
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    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: U.S. Geological Survey

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?
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Attn: PCMSC Science Data Coordinator
    2885 Mission Street
    Santa Cruz, CA
    US

    831-427-4747 (voice)
    pcmsc_data@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 3)
    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).
    Date: 23-May-2018 (process 2 of 3)
    Metadata was modified to bring up to current USGS PCMSC standards. Several Thesaurus and keywords were added, and minor typos were corrected. No data information was changed. Person who carried out this activity:
    Susan A Cochran
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Geologist
    2885 Mission Street
    Santa Cruz, CA
    USA

    (831) 460-7545 (voice)
    scochran@usgs.gov
    Date: 24-Sep-2018 (process 3 of 3)
    Details about different Network Resource Name links was given in the Access Instructions section. Metadata Title was made consistent with rest of Digital Data Series. Phone number for Point of Contact and Metadata Contact was corrected. No data information was changed. Person who carried out this activity:
    Susan A Cochran
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Geologist
    2885 Mission Street
    Santa Cruz, CA
    USA

    (831) 460-7545 (voice)
    scochran@usgs.gov
  3. What similar or related data should the user be aware of?
    Gardner, James V., Mayer, Larry A., and Buktenica, Mark, 2000, Cruise Report; R/V Surf Surveyor Cruise S1-00-CL; Mapping the bathymetry of Crater Lake, Oregon: Open-File Report 2000-405, U.S. Geological Survey, Coastal and Marine Geology Program, Menlo Park, CA.

    Online Links:

    Ramsey, David W., Dartnell, Peter, Bacon, Charles R., Robinson, Joel E., and Gardner, James V., 2001, Crater Lake revealed: Geologic Investigations Series I-2790, U.S. Geological Survey, Coastal and Marine Geology Program, Menlo Park, CA.

    Online Links:

    Gardner, J.V., Dartnell, Peter, Helleqin, Laurent, Bacon, C.R., Mayer., L.A., and Buktenica, M.W., 2001, Bathymetry and selected perspective views of Crater Lake, Oregon: Water-Resources Investigations Report 2001-4046, U.S. Geological Survey, Coastal and Marine Geology Program, Menlo Park, CA.

    Online Links:

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

  1. How well have the observations been checked?
    Not applicable for raster data.
  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?
    This data set is complete as it contains all acquired data.
  5. How consistent are the relationships among the observations, including topology?
    Not applicable for raster 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:
USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data. This information is not intended for navigation purposes.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    Information Services
    Denver, CO
    USA

    (888)ASK-USGS (voice)
  2. What's the catalog number I need to order this data set? Downloadable Data: S-00-OR XYZ ASCII data
  3. What legal disclaimers am I supposed to read?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 24-Sep-2018
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA
US

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Generated by mp version 2.9.49 on Mon Sep 24 16:05:05 2018