R/V Parke Snavely (source vessel) navigation and survey geometry from USGS field activity 2021-619-FA collected in April of 2021 offshore Santa Cruz, CA

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Frequently anticipated questions:


What does this data set describe?

Title:
R/V Parke Snavely (source vessel) navigation and survey geometry from USGS field activity 2021-619-FA collected in April of 2021 offshore Santa Cruz, CA
Abstract:
Navigation data were recorded for the R/V Parke Snavely (RVPS; source vessel) during USGS field activity 2021-619-FA in April of 2021 off the coast of Santa Cruz, California. Data were collected as the RVPS towed a marine sparker sound source along seven depth site transects in water depths ranging between 25 and 600 meters. The R/V San Lorenzo (RVSL; receive vessel) maintained a nearly stationary position at the midpoint along the seven depth site transects and recorded sound with a calibrated hydrophone. Navigation data and survey geometry information are presented in csv format as well as a trackline shapefile.
Supplemental_Information:
Additional information about the field activity from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-619-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?
    Balster-Gee, Alicia F., Baldwin, Wayne E., and Hart, Partrick E., 20220920, R/V Parke Snavely (source vessel) navigation and survey geometry from USGS field activity 2021-619-FA collected in April of 2021 offshore Santa Cruz, CA: data release DOI:10.5066/P9EHITBI, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Balster-Gee, Alicia F., Baldwin, Wayne E., and Hart, Patrick E., 2022, Calibrated marine sparker source amplitude decay versus offset offshore Santa Cruz, California: data release DOI:10.5066/P9EHITBI, 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: -122.47431993
    East_Bounding_Coordinate: -121.81507587
    North_Bounding_Coordinate: 37.09648707
    South_Bounding_Coordinate: 36.72920243
  3. What does it look like?
    L200_pass_navigation.png (PNG)
    Map showing navigation along L200 planned trackline. Inset shows zoomed-in view at midpoint of L200 where the receive vessel (R/V San Lorenzo; RVSL) attempted to maintain stationary position for each pass of the source vessel (R/V Parke Snavely; RVPS).
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 19-Apr-2021
    Ending_Date: 28-Apr-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 Point data set. It contains the following vector data types (SDTS terminology):
      • Point (22337)
    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 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.
  7. How does the data set describe geographic features?
    2021-619-FA_RVPS_SrcNav.csv
    CSV table containing attribute information associated with the data set. (Source: Producer defined)
    linename
    Name of navigation line (Source: Assigned unique line identifier name)
    ValueDefinition
    PS-L25_S_aPass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site
    PS-L25_S_bPass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site
    PS-L25_S_cPass ‘c’ with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site
    PS-L25A_S_aPass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the second 25-meter depth site ‘25A’
    PS-L25A_S_a2Pass ‘a2’ (part two of pass a) with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site ‘25A’
    PS-L25A_S_a3Pass ‘a3’ with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site ‘25A’
    PS-L25A_S_bPass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site ‘25A’
    PS-L50_S_aPass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 50-meter depth site
    PS-L50_S_bPass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 50-meter depth site
    PS-L50A_S_aPass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 50-meter depth site ‘50A'
    PS-L50A_S_a2Pass ‘a2’ with the SIG ELP790 minisparker source (power 700 joules) at the 50-meter depth site ‘50A’
    PS-L50A_S_bPass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 50-meter depth site ‘50A’
    PS-L100_S_aPass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 100-meter depth site
    PS-L100_S_bPass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 100-meter depth site
    PS-L100_S_cPass ‘c’ with the SIG ELP790 minisparker source (power 700 joules) at the 100-meter depth site
    PS-L100_S_c2Pass ‘c2’ with the SIG ELP790 minisparker source (power 700 joules) at the 100-meter depth site
    PS-L200_S_aPass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 200-meter depth site
    PS-L200_S_bPass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 200-meter depth site
    PS-L200_S_cPass ‘c’ with the SIG ELP790 minisparker source (power 700 joules) at the 200-meter depth site
    PS-L200_D10_aPass ‘a’ with the Delta sparker source (power 1.0 kilojoule) at the 200-meter depth site
    PS-L200_D10_bPass ‘b’ with the Delta sparker source (power 1.0 kilojoule) at the 200-meter depth site
    PS-L200_D10_cPass ‘c’ with the Delta sparker source (power 1.0 kilojoule) at the 200-meter depth site
    PS-L200_D10_dPass ‘d’ with the Delta sparker source (power 1.0 kilojoule) at the 200-meter depth site
    PS-L600_S_aPass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 600-meter depth site
    PS-L600_S_bPass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 600-meter depth site
    PS-L600_D24_aPass ‘a’ with the Delta sparker source (power 2.4 kilojoules) at the 600-meter depth site
    PS-L600_D24_bPass ‘b’ with the Delta sparker source (power 2.4 kilojoules) at the 600-meter depth site
    nrp_lon
    Navigation Reference Point (NRP) longitude value from the GPS antenna location on the source vessel (Source: R/V Parke Snavely GPS (Applanix POS-MV))
    Range of values
    Minimum:-122.361167
    Maximum:-121.897193
    Units:longitude decimal degrees
    Resolution:0.000001
    nrp_lat
    Navigation Reference Point (NRP) latitude value from the GPS antenna location on the source vessel (Source: R/V Parke Snavely GPS (Applanix POS-MV))
    Range of values
    Minimum:36.763300
    Maximum:36.992469
    Units:latitude decimal degrees
    Resolution:0.000001
    lbsrc_lon
    Source layback longitude position from the stern of the R/V Parke Snavelybased on the measured length of the cable deployed behind the source vessel (Source: U.S. Geological Survey)
    Range of values
    Minimum:-122.361282
    Maximum:-121.896982
    Units:decimal degrees
    Resolution:0.000001
    lbsrc_lat
    instrument layback latitude position based on the measured length of the cable deployed behind the source vesselSource layback latitude position from the stern of the R/V Parke Snavely (Source: U.S. Geological Survey)
    Range of values
    Minimum:36.763391
    Maximum:36.992559
    Units:decimal degrees
    Resolution:0.000001
    offset
    distance in meters between the instrument layback position of the sparker source off the stern of the source vessel and the hydrophone deployed from the nearly stationary receiver vessel (Source: U.S. Geological Survey)
    Range of values
    Minimum:10
    Maximum:5441
    Units:rounded to nearest meter
    Resolution:1
    y
    Year collected (Source: time stamp from GGA navigation string from source vessel R/V Parke Snavely)
    Range of values
    Minimum:2021
    Maximum:2021
    Units:year collected
    Resolution:1
    jd
    Julian Day collected (Source: time stamp from GGA navigation string from source vessel R/V Parke Snavely)
    Range of values
    Minimum:111
    Maximum:119
    Units:Julian day collected
    Resolution:1
    h
    hour collected in 24-hour format (Source: time stamp from GGA navigation string from source vessel R/V Parke Snavely)
    Range of values
    Minimum:14
    Maximum:20
    Units:hour of day collected
    Resolution:1
    m
    minute collected (Source: time stamp from GGA navigation string from source vessel R/V Parke Snavely)
    Range of values
    Minimum:0
    Maximum:59
    Units:minute of hour collected
    Resolution:1
    s
    second collected (Source: time stamp from GGA navigation string from source vessel R/V Parke Snavely)
    Range of values
    Minimum:0
    Maximum:59
    Units:second of minute collected
    Resolution:1
    us
    microsecond collected (Source: time stamp from GGA navigation string from source vessel R/V Parke Snavely)
    Range of values
    Minimum:48592
    Maximum:999936
    Units:microsecond of second of minute collected
    Resolution:1
    utc_dt
    Coordinated Universal Time (UTC) Day Time string (Source: producer defined) Sequential unique whole numbers that are automatically generated. For example, 2021-04-23 18:31:02.999936+00:00 represents 2021-04-23 as the date collected and 18:31:02.999936+00:00 is the UTC time that the navigation point was taken.
    surveyid
    USGS field activity number (FAN) assigned to data collection activity (Source: producer defined) 2021-619-FA, details for which may be found at https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-619-FA
    vehicleid
    name of the source vessel from which data were collected (Source: producer defined) R/V Parke Snavely
    deviceid
    Sparker source type and power level (in joules) (Source: producer defined)
    ValueDefinition
    Applied Acoustics Delta Sparker (2400 J)Brand name and model of sparker source and power level measured in joules
    Applied Acoustics Delta Sparker (1000 J)Brand name and model of sparker source and power level measured in joules
    SIG ELP790 Sparker (700 J)Brand name and model of sparker source and power level measured in joules
    2021-619-FA_RVPS_SrcNavTrackline_shapefile.zip
    Zip file contains a multi-line shapefile (.shp) of the source vessel tracklines (R/V Parke Snavely, RVPS) that contains attribute information associated with the data set. (Source: Producer defined)
    linename
    Name of navigation line (Source: Assigned unique line identifier name)
    ValueDefinition
    PS-L25_S_aPass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site
    PS-L25_S_bPass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site
    PS-L25_S_cPass ‘c’ with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site
    PS-L25A_S_aPass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the second 25-meter depth site ‘25A’
    PS-L25A_S_a2Pass ‘a2’ (part two of pass a) with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site ‘25A’
    PS-L25A_S_a3Pass ‘a3’ with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site ‘25A’
    PS-L25A_S_bPass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site ‘25A’
    PS-L50_S_aPass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 50-meter depth site
    PS-L50_S_bPass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 50-meter depth site
    PS-L50A_S_aPass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 50-meter depth site ‘50A'
    PS-L50A_S_a2Pass ‘a2’ with the SIG ELP790 minisparker source (power 700 joules) at the 50-meter depth site ‘50A’
    PS-L50A_S_bPass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 50-meter depth site ‘50A’
    PS-L100_S_aPass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 100-meter depth site
    PS-L100_S_bPass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 100-meter depth site
    PS-L100_S_cPass ‘c’ with the SIG ELP790 minisparker source (power 700 joules) at the 100-meter depth site
    PS-L100_S_c2Pass ‘c2’ with the SIG ELP790 minisparker source (power 700 joules) at the 100-meter depth site
    PS-L200_S_aPass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 200-meter depth site
    PS-L200_S_bPass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 200-meter depth site
    PS-L200_S_cPass ‘c’ with the SIG ELP790 minisparker source (power 700 joules) at the 200-meter depth site
    PS-L200_D10_aPass ‘a’ with the Delta sparker source (power 1.0 kilojoules) at the 200-meter depth site
    PS-L200_D10_bPass ‘b’ with the Delta sparker source (power 1.0 kilojoules) at the 200-meter depth site
    PS-L200_D10_cPass ‘c’ with the Delta sparker source (power 1.0 kilojoules) at the 200-meter depth site
    PS-L200_D10_dPass ‘d’ with the Delta sparker source (power 1.0 kilojoules) at the 200-meter depth site Enumerated_Domain_Value_Definition_Source: Producer defined
    PS-L600_S_aPass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 600-meter depth site
    PS-L600_S_bPass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 600-meter depth site
    PS-L600_D24_aPass ‘a’ with the Delta sparker source (power 2.4 kilojoules) at the 600-meter depth site
    PS-L600_D24_bPass ‘b’ with the Delta sparker source (power 2.4 kilojoules) at the 600-meter depth site
    utc_dt_s
    Coordinated Universal Time (UTC) Day Time string of start of navigation line (Source: producer defined) Sequential unique whole numbers that are automatically generated. For example, 2021-04-23 18:31:02.999936+00:00 represents 2021-04-23 as the date collected and 18:31:02.999936+00:00 is the UTC time that the navigation point was taken.
    utc_dt_e
    Coordinated Universal Time (UTC) Day Time string of end of navigation line (Source: producer defined) Sequential unique whole numbers that are automatically generated. For example, 2021-04-23 18:31:02.999936+00:00, where 2021-04-23 represents the date collected and 18:31:02.999936+00:00 is the UTC time that the navigation point was taken
    surveyid
    USGS field activity number (FAN) number assigned to data collection activity (Source: producer defined) 2021-619-FA, details for which may be found at https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-619-FA
    vehicleid
    name of the vessel from which data were collected (Source: producer defined) R/V Parke Snavely
    deviceid
    Sparker source type and power level (in joules) (Source: producer defined)
    ValueDefinition
    Applied Acoustics Delta Sparker (2400 J)Brand name and model of sparker source and power level measured in joules
    Applied Acoustics Delta Sparker (1000 J)Brand name and model of sparker source and power level measured in joules
    SIG ELP790 Sparker (700 J)Brand name and model of sparker source and power level measured in joules
    length_km
    navigation trackline length (in kilometers) (Source: vessel GPS)
    Range of values
    Minimum:0.117
    Maximum:7.208
    Units:kilometers
    Resolution:0.001
    Entity_and_Attribute_Overview:
    Source vessel navigation tracklines are provided for visual purposes and described in the shapefile. The first line of the csv file is a header line.
    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)
    • Alicia F. Balster-Gee
    • Wayne E. Baldwin
    • Partrick E. Hart
  2. Who also contributed to the data set?
    The authors acknowledge our fellow participants of the sparker testing field activity 2021-619-FA (Pete Dal Ferro, Gerry Hatcher, Jared Kluesner, Rachel Marcuson, Jenny McKee, Dan Powers, and Rob Wyland) and our team involved in survey planning and execution (Jackson Currie, William Danforth, Jane Denny, Tim Elfers, Dave Foster, Nathan Miller, Eric Moore, and Carolyn Ruppel).
  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?

This two-vessel survey was designed to quantify the decay of sound emitted from the SIG ELP790 minisparker (powered at 700 joules) and from the Applied Acoustics Delta Sparker (powered at 1.0 and 2.4 kilojoules) as a function of distance during marine geophysical surveys. Seven transect sites were surveyed at five different water depths (25, 50, 100, 200, and 600 meters) to compare the effects of water depth on peak sound level. The source vessel (RVPS) towed the sparker sound source as well as a calibrated hydrophone (TC4034) to record the near-field outgoing signal along the transects. The receive vessel (RVSL) maintained a nearly stationary position at the midpoint of each transect and continuously recorded sound with a calibrated hydrophone (CR3101 or CR3102) at depths between 10 and 20 meters, depending on deployed cable length.

How was the data set created?

  1. From what previous works were the data drawn?
    RVSL_recnav (source 1 of 1)
    Balster-Gee, Alicia F., Baldwin, Wayne E, and Hart, Patrick E., 2022, R/V San Lorenzo (receive vessel) navigation and survey geometry from USGS field activity 2021-619-FA collected in April of 2021 offshore Santa Cruz, CA: U.S. Geological Survey, online.

    Online Links:

    Type_of_Source_Media: online data
    Source_Contribution:
    Receiver vessel navigation data were used to calculate the offset distance between the sparker layback and the receiver vessel hydrophone.
  2. How were the data generated, processed, and modified?
    Date: 27-Apr-2021 (process 1 of 2)
    Navigation data were acquired using an Applanix PosMV Elite differential Global Positioning System (DGPS) while the source vessel (RVPS) made several passes along seven planned survey tracklines ranging between 25 and 600 meters water depth. A unique code name was given to each navigation line where PS=the source vessel R/V Parke Snavely; L=line followed by 2- or 3-numerals representing the water depth (the water depth may be followed by an A denoting a planned replicate transect line); S=SIG ELP790 700-joule minisparker source, D10=1.0 kilojoule Delta sparker source, or D24=2.4 kilojoule Delta sparker source; subsequent passes are followed with a, b, c, d, and a numeral as needed.
    Date: 27-Apr-2021 (process 2 of 2)
    Navigation data were recorded in raw GGA format. and in a series of Python notebooks the UTC timestamp, latitude, and longitude were extracted. The layback position of the sparker source was calculated to be 20 meters from the stern of the vessel, based on the measured length of the source cable deployed. The Python tool PyProj.Geod WGS84 was used to merge the data frames of the source layback latitude and longitude positions (lbsrc_lat and lbsrc_lon, respectively) and to calculate and assign the offset distance between the position of the sparker source (source layback) and the hydrophone deployed from the nearly stationary receiver vessel (RVSL) for each UTC time sample (utc_dt). Data sources used in this process:
    • RVSL_recnav
  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?
    Source vessel (RVPS) navigation files (raw GGA format) were imported and sorted into an SQLite database and the attribute fields were assigned in a Python notebook utilizing the Python tool PyProj.Geod WGS84. Source vessel navigation tracklines are also described in the accompanying shapefile (see 2021-619-FA_RVPS_SrcNavTrackline_shapefile.zip).
  2. How accurate are the geographic locations?
    An Applanix POS-MV (Position and Orientation System for Marine Vessels) Elite was used to position the source vessel during data collection. The Applanix POS-MV Elite has a stated positional accuracy of 0.5-2 meters (https://www.applanix.com/downloads/products/specs/posmv/POS-MV-ELITE.pdf). Accuracies of final products may be lower due to total propagated uncertainties of the mapping systems, which include position and motion compensation system and navigation error.
  3. How accurate are the heights or depths?
    No vertical positional data are provided.
  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?
    Quality control was conducted during acquisition and processing to ensure consistency of the vessel position and UTC time of acquisition.

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 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 - CMGDS
    2885 Mission Street
    Santa Cruz, CA

    831-427-4747 (voice)
    pcmsc_data@usgs.gov
  2. What's the catalog number I need to order this data set? Navigation, layback, and offset data are available in csv format (2021-619-FA_RVPS_SrcNav.csv) accompanied by a shapefile of trackline positions (2021-619-FA_RVPS_SrcNavTrackline_shapefile.zip).
  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: csv table in format comma-delimited text (version RFC 4180) Size: 3.8
      Network links: https://doi.org/10.5066/P9EHITBI
    • Cost to order the data: None.

    • Availability in digital form:
      Data format: zip file contains a vessel navigation shapefile for the R/V Parke Snavely in format shapefile (version ArcGIS Pro (version 2.4.1)) Size: 0.2388
      Network links: https://doi.org/10.5066/P9EHITBI
    • Cost to order the data: None.

  5. What hardware or software do I need in order to use the data set?
    The csv data can be viewed with any text editing or spreadsheet software. Users must have software capable of reading shapefile (.shp) format to use the polyline shapefile.

Who wrote the metadata?

Dates:
Last modified: 20-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)

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