Video-OCS Floating Wind Farm Site

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Frequently anticipated questions:


What does this data set describe?

Title: Video-OCS Floating Wind Farm Site
Abstract:
This data release contains digital video files from the USGS field activity 2014-607-FA, a survey of the Oregon Outer Continental Shelf (OCS) Floating Wind Farm Site in 2014. Video data were collected over 3 days between September 6 and September 9, 2014 using a towed camera sled system. 11.6 hours of video were collected along 18 transects; the mean length of time per transect was 38 minutes. Video operations were conducted by deploying up drift of a target and drifting over it at speeds of 1 knot or slower. The video data were collected in order to ground truth geologic and habitat interpretations of sonar data collected during the same field activity. The video-survey locations were chosen after the sonar mapping to investigate sea-floor features of interest, including bathymetric features such as ridges and depressions, areas that represent the spectrum of backscatter intensity observed in the survey area, and areas that represent the spectrum of water depths surveyed. The camera sled was equipped with both vertical-downward and adjustable oblique-forward facing HD video cameras. Paired lasers set a fixed distance apart are visible in the video and are used to scale features on the seafloor. A fiber optic cable was used to allow real-time on-board viewing of both camera feeds. The sled was also equipped with a forward-scanning sonar system for collision avoidance. Conductivity and temperature were continuously recorded using a SeaBird Seacat 37-SM. Depth and altitude were measured to aid operations but not recorded. A downward facing still camera, designed for small invertebrate identification, was attached to the sled, but insufficient lighting rendered the still images unusable. Real-time observations of the major and minor substrate type were made, as well as occasional comments about organisms, features, or objects of interest.
Supplemental_Information:
Additional information about the field activity from which these data were derived is available online at: http://cmgds.marine.usgs.gov/fan_info.php?fan=2014-607-FA
  1. How might this data set be cited?
    Cochrane, Guy R., and Dartnell, Peter, 2017, Video-OCS Floating Wind Farm Site: Data Release doi:10.5066/F7V40S8V, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Cochrane, Guy R., Dartnell, Peter, Hemery, Lenaig G., and Hatcher, Gerry, 2017, Data release for USGS Field Activity 2014-607-FA, Oregon OCS Seafloor Mapping: Selected Lease Blocks Relevant to Renewable Energy: data release doi:10.5066/F7V40S8V, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -124.79
    East_Bounding_Coordinate: -124.437
    North_Bounding_Coordinate: 43.562
    South_Bounding_Coordinate: 43.289
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/58ffa17fe4b0e85db3a46c32?name=OregonOCS_DiveLocations.jpg&allowOpen=true (JPEG)
    Map showing dive locations for video collection during the Oregon OCS survey (USGS 2014-607-FA).
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 03-Sep-2014
    Ending_Date: 09-Sep-2014
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: MPEG-4 Video
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      Indirect_Spatial_Reference:
      Underwater digital video was collected off the coast of Coos Bay, central Oregon. GPS navigation coordinates of the ship’s location are encoded and recorded into the audio track of the video footage.
    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 1.0E-6. Longitudes are given to the nearest 1.0E-6. 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 6378137.0.
      The flattening of the ellipsoid used is 1/298.257223563.
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview: MPEG-4 Part 10 (H.264) encoded video files
    Entity_and_Attribute_Detail_Citation:
    H.264 video standard developed by Motion Picture Experts Group (MPEG) and Video Coding Experts Group (VCEG)

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Guy R. Cochrane
    • Peter Dartnell
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Guy R. Cochrane
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    2885 Mission Street
    Santa Cruz, CA
    USA

    (831) 460-7554 (voice)
    gcochrane@usgs.gov

Why was the data set created?

These data are intended for science researchers, students, policy makers, and the general public. 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: 2014 (process 1 of 3)
    Video was collected over 3 days using a towed camera sled. The camera sled has downward and adjustable oblique-forward facing HD video cameras. There were 18 video transects; 11.6 hours of video were collected; the mean length of time per transect was 38 minutes. Video operations were conducted by deploying up drift of a target and drifting over it at speeds of 1 knot or slower. Raw video was recorded in nanoFlash MXF digital files. GPS data was encoded and recorded onto the audio track of the video files using RedHen VMS hardware.
    Date: 2014 (process 2 of 3)
    MXF video files were converted to MPEG-2 encoded mpg container digital files using FFmpeg for further processing byRedHen software.
    Date: 2017 (process 3 of 3)
    The MPEG-2 video files were converted to MPEG-4 encoded mp4 container digital files using FFmpeg. This allowed the mp4 video files to have a subtitle track containing navigation added to the file. The subtitle tracks were generated using the navigation output from the GPS encoded audio tracks, and they display the date, time, latitude and longitude of video recording; subtitles are updated in the video every second.
  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 video data.
  2. How accurate are the geographic locations?
    Estimated to be no less than 2 m, owing to water depth and total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation.
  3. How accurate are the heights or depths?
    Not applicable to video imagery.
  4. Where are the gaps in the data? What is missing?
    Complete
  5. How consistent are the relationships among the observations, including topology?
    Unspecified

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 - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO
    United States

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? Video files are grouped into zip files by survey line and camera (vertical or oblique) and dive transect number.
  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?
    • Availability in digital form:
      Data format: The video files are MPEG-4 encoded H.264 video files in mp4 container format and contain a subtitle track displaying navigation data. in format MPEG-4 (version none) MPEG-4 encoded video files
      Network links: https://www.sciencebase.gov/catalog/file/get/58ffa17fe4b0e85db3a46c32
    • Cost to order the data: None

  5. What hardware or software do I need in order to use the data set?
    The downloadable data files have 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 playing the video file, such as VLC media player. Media players enabled with srt subtitle readers can display the subtitled navigation data by selecting and enabling the subtitle track for the video file.

Who wrote the metadata?

Dates:
Last modified: 25-Jul-2017
Metadata author:
Guy R. Cochrane
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Geophysicst
2885 Mission Street
Santa Cruz, CA
United States

831-460-7554 (voice)
gcochrane@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/Videos_2014-607-FA_metadata.faq.html>
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