CTD (Conductivity Temperature Depth) data collected October-November 2019 offshore of California and Oregon

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Frequently anticipated questions:


What does this data set describe?

Title:
CTD (Conductivity Temperature Depth) data collected October-November 2019 offshore of California and Oregon
Abstract:
CTD (Conductivity Temperature Depth) data were collected October-November 2019 offshore of California and Oregon as part of the ongoing EXPRESS: Expanding Pacific Research and Exploration of Submerged Systems project. The data were collected using an SBE 49 FastCAT V 1.2a CTD profiler attached to the “Yogi” ROV launched from the National Oceanic and Atmospheric Administration’s (NOAA’s) R/V Reuben Lasker (NOAA cruise R-19-05).
Supplemental_Information:
Additional information about the USGS field activity from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2019-672-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  1. How might this data set be cited?
    Baker, Miranda C., and Prouty, Nancy G., 20220630, CTD (Conductivity Temperature Depth) data collected October-November 2019 offshore of California and Oregon: data release DOI:10.5066/P9F7K9F2, 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: -124.8042
    East_Bounding_Coordinate: -118.4678
    North_Bounding_Coordinate: 46.5528
    South_Bounding_Coordinate: 33.1885
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 09-Oct-2019
    Ending_Date: 06-Nov-2019
    Currentness_Reference:
    Ground condition at time data were collected.
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: comma separated values
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Point data set.
    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 0.0001. Longitudes are given to the nearest 0.0001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is D_WGS_1984.
      The ellipsoid used is D_WGS_1984.
      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?
    Comma separated value files. First line of file is header.
    Output text file from SBE 49 FastCAT V 1.2a containing data points from CTD water column profiles with temperature, conductivity, pressure, salinity, and depth. (Source: Producer defined.)
    Time
    Time the sample was collected (Source: Producer defined.)
    Range of values
    Minimum:00:00:00
    Maximum:23:59:59
    Units:Time in HH:mm:ss
    Start Latitude
    Start Latitude (Source: Latitide at the start of the ROV dive)
    Range of values
    Minimum:33.18860681
    Maximum:46.55245123
    Units:decibars
    Resolution:0.00000001
    Start Longitude
    Start Longitude (Source: Longitude at the start of the ROV dive)
    Range of values
    Minimum:-124.80428952
    Maximum:-118.46801493
    Units:decibars
    Resolution:0.00000001
    Pressure
    Pressure (Source: Producer defined.)
    Range of values
    Minimum:0.0272
    Maximum:1262.232
    Units:decibars
    Resolution:0.001
    Depth
    Depth (Source: Producer defined.)
    Range of values
    Minimum:0.270
    Maximum:1249.000
    Units:meters
    Resolution:0.001
    Temperature
    Temperature (Source: Producer defined.)
    Range of values
    Minimum:3.0838
    Maximum:18.8779
    Units:degrees Celsius
    Resolution:0.0001
    Conductivity
    Conductivity (Source: Producer defined.)
    Range of values
    Minimum:0.099815
    Maximum:43.114992
    Units:microsiemens per centimeter
    Resolution:0.000001
    Time Elapsed
    Time elapsed since the start of dive (Source: Producer defined.)
    Range of values
    Minimum:0.469
    Maximum:37157.165
    Units:seconds
    Resolution:0.001
    Salinity
    Salinity (Source: Producer defined.)
    Range of values
    Minimum:0.6675
    Maximum:1060.7057
    Units:practical salinity units
    Resolution:0.0001
    Potential Temperature
    Potential Temperature (Source: Producer defined.)
    Range of values
    Minimum:2.9948
    Maximum:18.8766
    Units:degrees Celsius
    Resolution:0.0001
    Density
    Density (Source: Producer defined.)
    Range of values
    Minimum:0.0015
    Maximum:1162.1999
    Units:kilogram per cubic meter
    Resolution:0.0001
    Entity_and_Attribute_Overview: First line of the file is the header.
    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)
    • Miranda C. Baker
    • Nancy G. Prouty
  2. Who also contributed to the data set?
    Joanne Thede Ferreira, U.S. Geological Survey
  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?

Data were collected to provide water column information to complement ROV data. The goal of EXPRESS is to develop comprehensive digital elevation models, habitat maps, and geologic maps, which are needed to address important issues associated with marine spatial planning, ecosystem assessments, geohazards, and the impact on sensitive ecosystems of offshore infrastructure development.

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: 01-Oct-2020 (process 1 of 1)
    Conductivity, salinity, and depth (CTD) data were collected with a SBE 49 FastCAT V 1.2a CTD profiler. Data were accumulated into comma separated values files, and data collected when instruments were out of the water were removed during post-processing. Files are named using a multi-element alphanumeric code delimited by dashes and underscores as follows: the date of the start of ROV dive in YYYYMMDD format; the dive number; the name of the ROV (yogi); the instrument (ctd); the abbreviation for the research vessel (RL for Lasker); the year of the field activity (19=2019); the cruise number of the vessel (05); and the resolution of the CTD data (1m=1 meter, 1s= 1 second). Times in the raw files were converted from Julian Days to HH:mm:ss and rows containing negative density values were deleted in MS Excel.
  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?
    CTD was calibrated according to Sea-Bird user manual.
  2. How accurate are the geographic locations?
    A formal accuracy assessment of the horizontal positional information in the data set has not been conducted. The horizontal accuracy is estimated at less than 1 m.
  3. How accurate are the heights or depths?
    A formal accuracy assessment of the vertical positional information in the data set has not been conducted. Depth was determined using the SeaBird CTD digiquartz pressure sensor with an accuracy of 0.015 percent.
  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?
    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, Bureau of Ocean Energy Management (BOEM), and the National Oceanic and Atmospheric Administration (NOAA) as the originators 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

    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 comma separated value files contained in single zip file (2019_yogi_CTD_RL-10-05_data.zip). Each file contains the water column data for an individual ROV cast.
  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?
    These data can be viewed with any text editor software.

Who wrote the metadata?

Dates:
Last modified: 30-Jun-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)

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