Multibeam bathymetry data collected in 2017 and 2018 of Noyes Submarine Canyon and vicinity, southeast Alaska

Metadata also available as - [Outline] - [Parseable text] - [XML]

Frequently anticipated questions:

What does this data set describe?

Title:
Multibeam bathymetry data collected in 2017 and 2018 of Noyes Submarine Canyon and vicinity, southeast Alaska
Abstract:
These metadata describe bathymetry data collected during 2017 and 2018 multibeam echosounder surveys of Noyes Submarine Canyon and vicinity, southeast Alaska. Data were collected by the National Oceanic and Atmospheric Administration (NOAA) aboard the NOAA survey vessel Fairweather and the data were post-processed by the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC) for PCMSC research projects.
Supplemental_Information:
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, Brothers, Daniel S., and Andrews, Brian D., 20220919, Multibeam bathymetry data collected in 2017 and 2018 of Noyes Submarine Canyon and vicinity, southeast Alaska: data release DOI:10.5066/P9AU5I03, 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, Brothers, Daniel S., and Andrews, Brian D., 2022, Multibeam bathymetry and acoustic-backscatter data collected in 2017 and 2018 of Noyes Submarine Canyon and vicinity, southeast Alaska: data release DOI:10.5066/P9AU5I03, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -134.85
    East_Bounding_Coordinate: -133.79
    North_Bounding_Coordinate: 55.31
    South_Bounding_Coordinate: 54.21
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/5ceef6a3e4b0fd6593c49d8d?name=NoyesCyn_2017_2018_30m_bathy_UTM08_WGS84_QV.jpg (JPEG)
    Quick view image of 2017-2018 Noyes submarine canyon bathymetry data
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 17-Jun-2017
    Ending_Date: 29-Jun-2018
    Currentness_Reference:
    ground condition at time data were collected.
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: GeoTIFF
  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 4079 x 2644 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: 8
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -135.00000
      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 30.0
      Ordinates (y-coordinates) are specified to the nearest 30.0
      Planar coordinates are specified in Meters
      The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      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: World Geodetic Datum of 1984 (WGS 84)
      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
    Raster values represent elevation in meters relative to the WGS 84 ellipsoid. (Source: Producer defined)
    Entity_and_Attribute_Overview:
    The complete 30-m resolution "NoyesCyn_2017_2018_30m_bathy_UTM08_WGSA84" grid was originally archived as a TIFF image with the following attributes. 
    Cell size = 30.0
Number of rows = 4079
Number of columns = 2644

Data type = floating point

Boundary
Xmin = 509865
Xmax = 589185
Ymin = 6007305
Ymax = 6129675

Statistics
Minimum value = -2194
Maximum value = -185.3
Mean = -1097.17
Standard deviation = 510.61

Coordinate system description
Projection  UTM
Zone  8
Datum  WGS 84
Vertical Reference WGS 84
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
    • Daniel S. Brothers
    • Brian D. Andrews
  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?

In 2017 and 2018 the NOAA survey vessel Fairweather collected bathymetry and acoustic-backscatter data in and around Noyes Submarine Canyon in southeast Alaska using a Kongsberg EM-710 multibeam echosounder (NOAA survey D00208, https://www.ngdc.noaa.gov/nos/D00001-D02000/D00208.html and NOAA survey D00245, https://www.ngdc.noaa.gov/nos/D00001-D02000/D00245.html). These surveys were conducted to map the offshore expression of the Queen Charlotte-Fairweather fault system that runs for approximately 500 kilometers off the coast of southeast Alaska and British Columbia. These were part of a series of surveys to map the entire offshore component of the fault. The fault system has generated numerous powerful earthquakes in the magnitude 7 and 8 range. This new mapping will help understand the fault's slip rate, earthquake recurrence intervals, and paleoseismic history. The data provided in this data release were processed by PCMSC for these research studies. 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: 2018 (process 1 of 1)
    In 2017 and 2018 the NOAA survey vessel Fairweather mapped in and around Noyes Submarine Canyon in southeast Alaska using a Kongsberg EM-710 multibeam echosounder. USGS, PCMSC processed the bathymetry data post-cruise. The survey line files were imported into Caris HIPS and SIPS software (version 11) for processing. Post-processed Applanix POS-MV attitude data (SBET) were merged with each line file. Water column sound velocity data that was collected throughout the surveys was applied to the bathymetry data. The data were cleaned of obvious bad soundings and the soundings were gridded into one 30-m surface. The merged bathymetry grid was then exported as a TIFF file in UTM zone 8, WGS 84.
  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?
    The NOAA survey vessel Fairweather was outfitted with an Applanix POS-MV position and motion compensation system. This system has post-processed horizontal positional accuracy of about 0.1 m and roll and pitch accuracies of about 0.02 degrees (https://www.applanix.com/downloads/products/specs/posmv/POS-MV-WaveMaster-II.pdf). Accuracies of final products may be lower due 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?
    The NOAA survey vessel Fairweather was outfitted with an Applanix POS-MV position and motion compensation system. This system has post-processed vertical accuracy of about 0.2 m (https://www.applanix.com/downloads/products/specs/posmv/POS-MV-WaveMaster-II.pdf). Accuracies of final products may be lower due 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 and the National Oceanic and Atmospheric Administration 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 GeoTIFF format, including a tif world file (.tfw) and CSDGM FGDC-compliant metadata.
  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 a GeoTIFF file.

Who wrote the metadata?

Dates:
Last modified: 19-Sep-2022
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/DataReleases/ScienceBase/DR_P9AU5I03/NoyesCyn_2017_2018_30m_bathy_UTM08_WGS84_Metadata.faq.html>
Generated by mp version 2.9.51 on Fri Sep 23 09:58:23 2022