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

Frequently anticipated questions:

• What does this data set describe?
  1. How might this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  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?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How might this data set be cited?
   Balster-Gee, Alicia F., Baldwin, Wayne E., and Hart, Patrick 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:

   • https://doi.org/10.5066/P9EHITBI

   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:

   • https://doi.org/10.5066/P9EHITBI

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)

   Value	Definition
   PS-L25_S_a	Pass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site
   PS-L25_S_b	Pass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site
   PS-L25_S_c	Pass ‘c’ with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site
   PS-L25A_S_a	Pass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the second 25-meter depth site ‘25A’
   PS-L25A_S_a2	Pass ‘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_a3	Pass ‘a3’ with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site ‘25A’
   PS-L25A_S_b	Pass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site ‘25A’
   PS-L50_S_a	Pass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 50-meter depth site
   PS-L50_S_b	Pass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 50-meter depth site
   PS-L50A_S_a	Pass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 50-meter depth site ‘50A'
   PS-L50A_S_a2	Pass ‘a2’ with the SIG ELP790 minisparker source (power 700 joules) at the 50-meter depth site ‘50A’
   PS-L50A_S_b	Pass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 50-meter depth site ‘50A’
   PS-L100_S_a	Pass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 100-meter depth site
   PS-L100_S_b	Pass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 100-meter depth site
   PS-L100_S_c	Pass ‘c’ with the SIG ELP790 minisparker source (power 700 joules) at the 100-meter depth site
   PS-L100_S_c2	Pass ‘c2’ with the SIG ELP790 minisparker source (power 700 joules) at the 100-meter depth site
   PS-L200_S_a	Pass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 200-meter depth site
   PS-L200_S_b	Pass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 200-meter depth site
   PS-L200_S_c	Pass ‘c’ with the SIG ELP790 minisparker source (power 700 joules) at the 200-meter depth site
   PS-L200_D10_a	Pass ‘a’ with the Delta sparker source (power 1.0 kilojoule) at the 200-meter depth site
   PS-L200_D10_b	Pass ‘b’ with the Delta sparker source (power 1.0 kilojoule) at the 200-meter depth site
   PS-L200_D10_c	Pass ‘c’ with the Delta sparker source (power 1.0 kilojoule) at the 200-meter depth site
   PS-L200_D10_d	Pass ‘d’ with the Delta sparker source (power 1.0 kilojoule) at the 200-meter depth site
   PS-L600_S_a	Pass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 600-meter depth site
   PS-L600_S_b	Pass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 600-meter depth site
   PS-L600_D24_a	Pass ‘a’ with the Delta sparker source (power 2.4 kilojoules) at the 600-meter depth site
   PS-L600_D24_b	Pass ‘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)

   Value	Definition
   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)

   Value	Definition
   PS-L25_S_a	Pass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site
   PS-L25_S_b	Pass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site
   PS-L25_S_c	Pass ‘c’ with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site
   PS-L25A_S_a	Pass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the second 25-meter depth site ‘25A’
   PS-L25A_S_a2	Pass ‘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_a3	Pass ‘a3’ with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site ‘25A’
   PS-L25A_S_b	Pass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 25-meter depth site ‘25A’
   PS-L50_S_a	Pass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 50-meter depth site
   PS-L50_S_b	Pass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 50-meter depth site
   PS-L50A_S_a	Pass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 50-meter depth site ‘50A'
   PS-L50A_S_a2	Pass ‘a2’ with the SIG ELP790 minisparker source (power 700 joules) at the 50-meter depth site ‘50A’
   PS-L50A_S_b	Pass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 50-meter depth site ‘50A’
   PS-L100_S_a	Pass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 100-meter depth site
   PS-L100_S_b	Pass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 100-meter depth site
   PS-L100_S_c	Pass ‘c’ with the SIG ELP790 minisparker source (power 700 joules) at the 100-meter depth site
   PS-L100_S_c2	Pass ‘c2’ with the SIG ELP790 minisparker source (power 700 joules) at the 100-meter depth site
   PS-L200_S_a	Pass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 200-meter depth site
   PS-L200_S_b	Pass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 200-meter depth site
   PS-L200_S_c	Pass ‘c’ with the SIG ELP790 minisparker source (power 700 joules) at the 200-meter depth site
   PS-L200_D10_a	Pass ‘a’ with the Delta sparker source (power 1.0 kilojoules) at the 200-meter depth site
   PS-L200_D10_b	Pass ‘b’ with the Delta sparker source (power 1.0 kilojoules) at the 200-meter depth site
   PS-L200_D10_c	Pass ‘c’ with the Delta sparker source (power 1.0 kilojoules) at the 200-meter depth site
   PS-L200_D10_d	Pass ‘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_a	Pass ‘a’ with the SIG ELP790 minisparker source (power 700 joules) at the 600-meter depth site
   PS-L600_S_b	Pass ‘b’ with the SIG ELP790 minisparker source (power 700 joules) at the 600-meter depth site
   PS-L600_D24_a	Pass ‘a’ with the Delta sparker source (power 2.4 kilojoules) at the 600-meter depth site
   PS-L600_D24_b	Pass ‘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)

   Value	Definition
   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
   • Patrick 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?

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:

   • https://doi.org/10.5066/P9EHITBI

   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 3)

   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 3)

   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

   Date: 16-May-2023 (process 3 of 3)

   Edits were made to correct spelling in author name. No data were changed. The metadata available from a harvester may supersede metadata bundled within a download file. Users are advised to compare the metadata date of this file to any similar file to ensure they are using the most recent version. (scochran@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?
   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?

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: 16-May-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)