Multibeam bathymetry data collected in 2016 for Lake Crescent in Olympic National Park, Washington

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Frequently anticipated questions:


What does this data set describe?

Title:
Multibeam bathymetry data collected in 2016 for Lake Crescent in Olympic National Park, Washington
Abstract:
In February 2016 the U.S. Geological Survey, Pacific Coastal and Marine Science Center in cooperation with North Carolina State University and the National Park Service collected multibeam bathymetry and acoustic backscatter data in Lake Crescent located in Olympic National Park, Washington. Data were collected using a Reson 7111 multibeam echosounder pole-mounted to the 36-foot USGS R/V Parke Snavely. These metadata describe the multibeam bathymetry raster data file that is included in "LakeCrescent_bathy_3m_UTM10_NAD83_NAVD88.zip" which is accessible from https://doi.org/10.5066/F7B56GW5.
Supplemental_Information:
Additional information about the field activities from which these data were derived are available online at
https://cmgds.marine.usgs.gov/fan_info.php?fan=2016-604-FA
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?
    Dartnell, Peter, Warrick, Jonathan A., and Wegmann, Karl W., 2017, Multibeam bathymetry data collected in 2016 for Lake Crescent in Olympic National Park, Washington: data release DOI:10.5066/F7B56GW5, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Dartnell, Peter, Warrick, Jonathan A., and Wegmann, Karl W., 2017, Multibeam bathymetry and acoustic-backscatter data collected in 2016 for Lake Crescent, Olympic National Park, Washington: data release DOI:10.5066/F7B56GW5, U.S. Geological Survey, Coastal and Marine Geology Program, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -123.917
    East_Bounding_Coordinate: -123.740
    North_Bounding_Coordinate: 48.096
    South_Bounding_Coordinate: 48.047
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 08-Feb-2016
    Ending_Date: 11-Feb-2016
    Currentness_Reference:
    ground condition at time data were collected.
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: ASCIIRaster
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Raster data set. It contains the following raster data types:
      • Dimensions 1758 x 4382 x 1, 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: 500000.0
      False_Northing: 0.00
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 3.0
      Ordinates (y-coordinates) are specified to the nearest 3.0
      Planar coordinates are specified in Meters
      The horizontal datum used is NAD83.
      The ellipsoid used is GRS80.
      The semi-major axis of the ellipsoid used is 6378137.00.
      The flattening of the ellipsoid used is 1/298.257223563.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: North American Vertical Datum of 1988]
      Altitude_Resolution: 0.1
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?
    value
    elevation in meters relative to NAVD88 (Source: Producer defined)
    Entity_and_Attribute_Overview:
    The complete 3-m resolution Lake Crescent bathymetry grid was originally archived as an ESRI grid with the following attributes.
    Cell size = 3.0
    Number of rows = 1758
    Number of columns = 4382
    
    Data type = floating point
    
    Boundary
    Xmin = 431687
    Xmax = 444833
    Ymin = 5321907
    Ymax = 5327181
    
    Statistics
    Minimum value = 2.29
    Maximum value = 175.94
    Mean = 73.32
    Standard deviation = 51.29
    
    Coordinate system description
    Projection  UTM
    Zone  10
    Datum  NAD83
    Vertical Reference NAVD88
    Units  meter
    
    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)
    • Peter Dartnell
    • Jonathan A. Warrick
    • Karl W. Wegmann
  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

    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. These data can be used with geographic information systems or other software to identify bathymetric features. These data are not intended to be used for navigation.

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: 2016 (process 1 of 3)
    Between February 8 and 11, 2016, the U.S. Geological Survey collected multibeam bathymetry and acoustic backscatter data in Lake Crescent, Washington using a Reson 7111 multibeam echosounder mounted on the R/V Parke Snavely. During the mapping mission an Applanix POS MV (Position and Orientation System for Marine Vessels) was used to accurately position the vessel during data collection and it also accounted for vessel motion such as heave, pitch, and roll. The POS MV also recorded position and vessel motion parameters for later post-processing. Sound-velocity profiles were collected throughout the survey days with an Applied Microsystems (AM) SVPlus sound velocimeter. The multibeam s7k files were imported into Caris HIPS and SIPS software and merged with post-processed POS MV Smoothed Best Estimate of Trajectory (SBET) files as well as the sound-velocity profiles. Soundings were cleaned for obvious errors and gridded into a 3-m base surface. The base surface was exported as an ASCIIRaster file in UTM-10 coordinates referenced to the WGS84 ellipsoid and imported into a GIS. Further grid cleaning of artifacts was completed in the GIS. From Geoid12B website http://www.ngs.noaa.gov/GEOID/GEOID12B/ there is a 20.227m offset between the WGS84 ellipsoid and NAVD88 elevations at 48 degrees, 3.509', 123 degrees 49.875' location (center of survey area). The value of 20.227 was added to the bathymetry grid to reference the grid to NAVD88 elevations. The grid was then projected from WGS84 to NAD83 using the WGS84_1984_(ITRF08)_to_NAD_1983_2011 tool in ESRI ArcTools. The grid was then exported to an ASCIIRaster file in UTM-10, NAD83 coordinates referenced to NAVD88 elevations.
    Date: 22-Jun-2018 (process 2 of 3)
    Metadata was modified to bring up to current USGS PCMSC standards. 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: 30-Aug-2018 (process 3 of 3)
    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
  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?
    Not applicable for raster data.
  2. How accurate are the geographic locations?
    Estimated to be no less than 3 m, owing to water depth and total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations.
  3. How accurate are the heights or depths?
    Estimated to be no less than 5 percent water depth, owing to water depth and total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations.
  4. Where are the gaps in the data? What is missing?
    Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.]
  5. How consistent are the relationships among the observations, including topology?
    No formal logical accuracy tests were conducted.

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, North Carolina State University, and the National Park Service as the originators 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 - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? These data are available in ASCIIRaster format (lakecrescent_bathy_3m_nad83_navd88.asc) contained in a single zip file (lakecrescent_bathy_3m_nad83_navd88.zip), which also includes CSDGM FGDC compliant metadata. An accompanying map in pdf format (LakeCrescent_2016_bathymetry_map.pdf) provides a visual display of the 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?
  5. What hardware or software do I need in order to use the data set?
    The downloadable data file has been compressed with the "zip" command and can be unzipped with Winzip (or other tool) on Windows systems. To utilize these data, the user must have software capable of uncompressing the WinZip file and importing and viewing an Esri ASCIIRaster file.

Who wrote the metadata?

Dates:
Last modified: 30-Aug-2018
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/LakeCrescent_bathy_3m_UTM10_NAD83_NAVD88.faq.html>
Generated by mp version 2.9.49 on Mon Sep 10 17:43:23 2018