Vessel-mounted acoustic Doppler current profiler (ADCP) data from the mouth of the Columbia River, Oregon and Washington, 2013

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Frequently anticipated questions:

What does this data set describe?

Title:
Vessel-mounted acoustic Doppler current profiler (ADCP) data from the mouth of the Columbia River, Oregon and Washington, 2013
Abstract:
Spatial surveys of water column currents were performed between June 14 and 16, 2013, in the mouth of the Columbia River, Oregon and Washington. These data were collected using an acoustic-doppler current profiler (ADCP).
Supplemental_Information:
Information about the data collection field activities can be found at: https://cmgds.marine.usgs.gov/fan_info.php?fan=S0313WO
  1. How might this data set be cited?
    Stevens, Andrew W., Gelfenbaum, Guy, MacMahan, Jamie, Reniers, Ad J.H.M., Elias, Edwin P., Sherwood, Christopher R., and Carlson, Emily M., 2017, Vessel-mounted acoustic Doppler current profiler (ADCP) data from the mouth of the Columbia River, Oregon and Washington, 2013: data release DOI:10.5066/F7NG4NS1, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Stevens, Andrew W., Gelfenbaum, Guy, MacMahan, Jamie, Reniers, Ad J.H.M., Elias, Edwin P., Sherwood, Christopher R., and Carlson, Emily M., 2017, Oceanographic measurements and hydrodynamic modeling of the mouth of the Columbia River, Oregon and Washington, 2013: data release DOI:10.5066/F7NG4NS1, 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: -124.011043
    East_Bounding_Coordinate: -123.937835
    North_Bounding_Coordinate: 46.263872
    South_Bounding_Coordinate: 46.210375
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/5907952de4b0fc4e448eb00d?name=mcr13_vmadcp_locs.png&allowOpen=true (PNG)
    Map showing locations of survey transects
    https://www.sciencebase.gov/catalog/file/get/5907952de4b0fc4e448eb00d?name=mcr13_vmadcp_example.png&allowOpen=true (PNG)
    Image showing example of vessel-mounted ADCP data along a transect
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 14-Jun-2013
    Ending_Date: 16-Jun-2013
    Currentness_Reference:
    ground condition at time data were collected
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: NetCDF files
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      Indirect_Spatial_Reference:
      Data were collected continuously along survey transects. Refer to self-contained NetCDF files for more location information.
    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 D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257223563.
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    NetCDF files are self-contained and attribute information may be found in the header of the file itself.
    Entity_and_Attribute_Detail_Citation:
    The entity and attribute information was generated by the individual and/or agency identified as the originator of the data set. Please review the rest of the metadata record for additional details and information.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Andrew W. Stevens
    • Guy Gelfenbaum
    • Jamie MacMahan
    • Ad J.H.M. Reniers
    • Edwin P. Elias
    • Christopher R. Sherwood
    • Emily M. Carlson
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Andrew W. Stevens
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Oceanographer
    2885 Mission Street
    Santa Cruz, CA
    USA

    831-460-7424 (voice)
    831-427-4748 (FAX)
    astevens@usgs.gov

Why was the data set created?

These acoustic-doppler current profiler (ADCP) were collected as a part of a larger investigation into hydrodynamics in the mouth of the Columbia River, Oregon and Washington.

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: 16-Jun-2013 (process 1 of 3)
    A total of 25 km of tracklines were surveyed with a vessel-mounted acoustic doppler current profiler (ADCP) in the mouth of the Columbia River (MCR) between June 14 and June 16, 2013. Three cross-channel transects were surveyed repeatedly to characterize changes in flow and backscatter amplitude at different stages of the tide cycle. Measurements of current velocity and acoustic backscatter amplitude in the water column were collected using a downward looking 600 kHz Teledyne RDI ADCP pole-mounted to the R/V Park Snavely. Positioning and orientation of the ADCP were measured using an Applanix POS MV 320 and recorded at 1 Hz intervals. Data acquisition and merging of the ADCP and positioning data were achieved with Teledyne RDI VMDAS software. While underway, profiles of current velocity and acoustic backscatter data were collected from 1.48 m below the transducer (approximately 2.2 m below the water surface) to the seafloor at 0.5 m intervals. Raw ADCP data were transformed to Earth coordinates in real time using heading and tilt information supplied by the POS MV. Velocity measurements were corrected to remove the motion of the vessel using the bottom ping, which estimates the vessel speed with respect to the seabed.
    Date: 19-May-2016 (process 2 of 3)
    Data were accumulated into NetCDF files.
    Date: 19-Oct-2020 (process 3 of 3)
    Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@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?
    Horizontal positional accuracy provided by the manufacturer is 0.5 - 2 m while operating in differential GPS mode.
  3. How accurate are the heights or depths?
    A formal accuracy assessment of the vertical positional information in the data set has either not been conducted, or is not applicable.
  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 metadata for each part of this data release carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    Data fall within expected ranges.

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.
  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
    USA

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? Downloadable data in NetCDF format. This zip file (mcr13_vmadcp.zip) contains 16 individual NetCDF files, one for each survey transect surveyed.
  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: 19-Oct-2020
Metadata author:
Andrew W. Stevens
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Oceanographer
2885 Mission Street
Santa Cruz, CA
USA

831-460-7424 (voice)
831-427-4748 (FAX)
astevens@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_F7NG4NS1/mcr13_vmadcp_metadata.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:17:19 2021