Bathymetry data from repeated surveys of a submerged nearshore berm at the mouth of the Columbia River, Washington, 2020-2021

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Frequently anticipated questions:

What does this data set describe?

Title:
Bathymetry data from repeated surveys of a submerged nearshore berm at the mouth of the Columbia River, Washington, 2020-2021
Abstract:
This portion of the USGS data release presents gridded bathymetry data derived from repeated bathymetric surveys conducted by the U.S. Army Corps of Engineers Portland District on the Pacific Ocean, Washington. Repeated surveys were performed between September 9, 2020, and March 10, 2021, from a vessel equipped with a multi-beam bathymetry system to characterize the morphology and dispersal of a nearshore berm composed of sediment dredged from the navigational channel at the mouth of the Columbia River. Digital data files containing gridded bathymetry data for each survey are provided in ESRI ARC ASCII (*.asc) format. These data accompany Stevens and others (2023).
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?
    Moritz, Hans R., McMillan, James M., and Stevens, Andrew W., 20230124, Bathymetry data from repeated surveys of a submerged nearshore berm at the mouth of the Columbia River, Washington, 2020-2021: data release DOI:10.5066/P9RVK9S9, 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., Moritz, Hans R., and McMillan, James M., 2023, Bathymetry data and sediment transport modeling of a submerged nearshore berm at the mouth of the Columbia River, Oregon and Washington, 2020-2021: data release DOI:10.5066/P9RVK9S9, 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: -124.101040
    East_Bounding_Coordinate: -124.136434
    North_Bounding_Coordinate: 46.2992846
    South_Bounding_Coordinate: 46.2809833
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/6227fc8ad34ee0c6b38b80d6?name=nhs_survey_area.png&allowOpen=true (PNG)
    Map showing location of bathymetric survey area
    https://www.sciencebase.gov/catalog/file/get/6227fc8ad34ee0c6b38b80d6?name=nhs_bathy.png&allowOpen=true (PNG)
    Gridded bathymetry from each survey
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 09-Sep-2020
    Ending_Date: 10-Mar-2021
    Currentness_Reference:
    Ground condition at time data were collected
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: comma-delimited text
  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.
    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 5
      Ordinates (y-coordinates) are specified to the nearest 5
      Planar coordinates are specified in METERS
      The horizontal datum used is NAD83.
      The ellipsoid used is GRS_1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: Mean Lower Low Water (MLLW)
      Altitude_Resolution: 0.01
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?
    Attribute Table
    Table containing attribute information associated with the data set (Source: Producer defined)
    Elevation
    Height in meters relative to the mean lower low water tidal datum. Values of -9999.00 indicate cells with no data. (Source: Producer Defined)
    Range of values
    Minimum:-16.78
    Maximum:-11.61
    Units:meters

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Hans R. Moritz
    • James M. McMillan
    • Andrew W. Stevens
  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?

Bathymetry data were obtained to characterize the morphology and dispersal of a nearshore berm composed of 216,000 cubic meters of sediment dredged from the navigational channel at the mouth of the Columbia River and placed outside the inlet in water depths between 12 and 15 m.

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: 10-Mar-2021 (process 1 of 3)
    Previously unpublished bathymetric data were acquired by the U.S. Army Corps of Engineers, and released here with the permission of the USACE. Bathymetric surveys were performed using the survey vessel Elton equipped with a Reson SeaBat T50-P mulitbeam sonar operated at 400 kHz. Depths were computed with sound velocity measurements acquired with either a YSI CastAway CTD or AML X2 Series sound velocity profiler. Positioning was achieved with an Applanix POS-MV Wavemaster II and submersible IMU operating primarily in real-time kinematic mode with differential corrections transmitted via NTRIP from the Oregon Real Time GNSS Network (https://www.oregon.gov/odot/ORGN/Pages/index.aspx). Post-processed positions were applied using Applanix POSPac MMS software when real time communications between the survey vessel and geodetic network failed. Hypack hydrographic software was used for survey data acquisition and post processing. Elevations relative to mean lower low water (MLLW) were computed using offsets from the National Geodetic Survey Geoid12a geoid model and tidal datum established at Hammond, Oregon.
    Date: 10-Oct-2021 (process 2 of 3)
    Original data were re-projected using UTM Zone 10, meters coordinate system and elevations were converted from survey feet to meters. Processed bathymetry data from each survey were gridded onto a using bin averaging onto a regular grid with 5-m resolution.
    Date: 09-Mar-2022 (process 3 of 3)
    Data were exported in ESRI ArcASCII format for distribution.
  3. What similar or related data should the user be aware of?
    Stevens, Andrew W., Moritz, Hans R., Elias, Edwin P.L., Gelfenbaum, Guy R., Ruggiero, Peter R., Pearson, Stuart G., McMillan, James M., and Kaminsky, George M., 2023, Monitoring and modeling dispersal of a submerged nearshore berm at the mouth of the Columbia River, USA: Coastal Engineering, Amsterdam, The Netherlands.

    Online Links:

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 Applanix POS-MV post-processed horizontal positional accuracy is about 0.1 m with roll and pitch accuracies of about 0.02 degrees (https://www.applanix.com/downloads/products/specs/posmv/POS-MV-WaveMaster-II.pdf). The SeaBat T50-P multibeam sonar system has an across-track beam width of 1 deg (http://www.teledynemarine.com/Lists/Downloads/RESON/SeaBat/SeaBat%20T50-P%20product%20leaflet.pdf) resulting in a resolution of about 17 cm in a water depth of 10 m. Accuracies of final products may be lower due to 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 Applanix POS-MV post-processed vertical positional accuracy is about 0.2 m (https://www.applanix.com/downloads/products/specs/posmv/POS-MV-WaveMaster-II.pdf). The SeaBat T50-P multibeam sonar system has a measurement resolution limit of 0.6 cm (http://www.teledynemarine.com/Lists/Downloads/RESON/SeaBat/SeaBat%20T50-P%20product%20leaflet.pdf). Accuracies of final products may be lower due to total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, fluctuations in the speed of sound in seawater, 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 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 - Science Base
    U.S. Geological Survey
    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? Gridded bathymetry data are available in Esri ARC/INFO ASCII GRID format, along with browse graphics of each gridded bathymetry dataset and location map in png format and associated 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?

Who wrote the metadata?

Dates:
Last modified: 24-Jan-2023
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_P9RVK9S9/nhs_bathy_metadata.faq.html>
Generated by mp version 2.9.51 on Thu Jan 26 17:28:07 2023