Navigation tracklines from a 2015 multibeam survey near Cross Sound, southeast Alaska, during field activity 2015-629-FA

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Frequently anticipated questions:

What does this data set describe?

Title:
Navigation tracklines from a 2015 multibeam survey near Cross Sound, southeast Alaska, during field activity 2015-629-FA
Abstract:
These metadata describe navigation tracklines from a 2015 multibeam echosounder survey near Cross Sound, southeast Alaska. Data were collected by the U.S. Geological Survey (USGS) and the Alaska Department of Fish and Game (ADFG) aboard the ADFG R/V Solstice during USGS field activity 2015-629-FA. The trackline data are provided as a GIS shapefile.
Supplemental_Information:
Additional information about the field activities from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2015-629-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, Brothers, Daniel S., and Haeussler, Peter J., 20220919, Navigation tracklines from a 2015 multibeam survey near Cross Sound, southeast Alaska, during field activity 2015-629-FA: data release DOI:10.5066/F7JH3KG6, 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 Haeussler, Peter J., 2022, Multibeam bathymetry and acoustic-backscatter data collected in 2015 near Cross Sound, southeast Alaska, during field activity 2015-629-FA: data release DOI:10.5066/F7JH3KG6, 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: -137.201
    East_Bounding_Coordinate: -136.217
    North_Bounding_Coordinate: 58.426
    South_Bounding_Coordinate: 57.808
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/5d1292f2e4b0941bde56ebaa?name=CrossSound_2015_tracklines_map.jpg&allowOpen=true (JPEG)
    Image of 2015 Cross Sound multibeam survey tracklines
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 05-May-2015
    Ending_Date: 21-May-2015
    Currentness_Reference:
    ground condition at time data were collected.
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: shapefile
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • String (504)
    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 WGS84.
      The ellipsoid used is WGS84.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.
  7. How does the data set describe geographic features?
    CrossSound_2015_tracklines
    shapefile of tracklines for 2015 multibeam survey near Cross Sound, southeast Alaska (Source: USGS)
    FID
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: ESRI) Coordinates defining the features.
    Day
    Year and Julian Day, the integer number representing the interval of time in days since January 1 of the year of collection (Source: USGS)
    Range of values
    Minimum:2015-125
    Maximum:2015-141
    Units:Julian day
    Line_Name
    Trackline number assigned by USGS (Source: USGS)
    Range of values
    Minimum:20150505_182946_Solstice
    Maximum:20150521_180243_Solstice
    Units:line number
    Min_Time
    time at start of trackline (Source: USGS)
    Range of values
    Minimum:2015-05-05 18:29:36.720
    Maximum:2015-05-21 18:02:33.670
    Units:date time
    Max_Time
    Time at end of trackline (Source: USGS)
    Range of values
    Minimum:2015-05-05 18:56:56.120
    Maximum:2015-05-21 18:04:23.670
    Units:date time
    Total_Time
    Total time of trackline (Source: USGS)
    Range of values
    Minimum:01:00.100
    Maximum:59:04.000
    Units:time
    length
    Length of trackline (Source: USGS)
    Range of values
    Minimum:1.969089
    Maximum:17566.68922
    Units:meters
    Entity_and_Attribute_Overview:
    The navigation polyline shapefile records the trackline followed by the Alaska Department of Fish and Game R/V Solstice in the 2015 survey near Cross Sound, southeast Alaska. The attributes are the day, USGS assigned line number, minimum time, maximum time total time, heading, length, and speed
    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
    • Peter J. Haeussler
  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 2015 the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC)in cooperation with the Alaska Department of Fish and Game (ADFG) collected bathymetry and acoustic backscatter data near Cross Sound in southeast Alaska using an Reson 7111 multibeam echosounder mounded to the ADFG R/V Solstice. The survey was conducted to map the offshore expression of the Queen Charlotte fault system that runs for approximately 500 kilometers off the coast of southeast Alaska and British Columbia. This was the first in 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. 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: 2019 (process 1 of 1)
    In May 2015 the USGS, PCMSC mapped offshore Cross Sound in southeast Alaska over the northern section of the Queen Charlotte fault. A Reson 7111 multibeam echosounder was pole-mounted to the Alaska Department of Fish and Game R/V Solstice. The survey line files were imported into Caris HIPS and SIPS software (version 9) for processing. The multibeam navigation trackline files were export from Caris as one GIS shapefile. The shapefile was imported in ESRI ArcMap. The shapefile was edited to remove unimportant attributes. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Peter Dartnell
    Pacific Coastal and Marine Science Center
    Santa Cruz, CA
    USA

    831-460-7415 (voice)
    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?
    No formal attribute accuracy tests were conducted.
  2. How accurate are the geographic locations?
    The Coda Octopus F180 position and motion compensation system has a horizontal positional accuracy of about 0.4 m with DGPS correstions and roll and pitch accuracies of about 0.025 degrees (https://www.oceanscan.net/gallery/Data_Sheets/CODA_F180_PRECISION_ALTITUDE__POSITIONING_SYSTEMS.pdf).
  3. How accurate are the heights or depths?
    Not applicable to trackline data.
  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 Alaska Department of Fish and Game 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? Downloadable zip file contains CrossSound_2015_tracklines.shp and other files associated with a shapefile.
  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 shapefile of navigation is compressed into a zip file (CrossSound_2015_tracklines.zip). To use these data, the user must have software capable of uncompressing the zip file and ArcGIS or another GIS application package capable of viewing the data.

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_F7JH3KG6/CrossSound_2015_tracklines_metadata.faq.html>
Generated by mp version 2.9.51 on Fri Sep 23 09:58:22 2022