Navigation data collected on Stellwagen Bank during U.S. Geological Survey field activity 2017-009-FA, aboard the R/V Auk, Jan 30, 2017

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Frequently anticipated questions:


What does this data set describe?

Title:
Navigation data collected on Stellwagen Bank during U.S. Geological Survey field activity 2017-009-FA, aboard the R/V Auk, Jan 30, 2017
Abstract:
This field activity is part of the effort to map geologic substrates of the Stellwagen Bank National Marine Sanctuary region off Boston, Massachusetts. The overall goal is to develop high-resolution (1:25,000) interpretive maps, based on multibeam sonar data and seabed sampling, showing surficial geology and seabed sediment dynamics. This cruise was conducted in collaboration with the Stellwagen Bank National Marine Sanctuary, and the data collected will aid research on the ecology of fish and invertebrate species that inhabit the region. The Sanctuary's research vessel, R/V Auk, visited 13 locations on Stellwagen Bank at which a customized Van Veen grab sampler (SEABOSS) equipped with a video camera and a CTD was deployed in drift mode to collect sediment for grain-size analysis, video imagery of the seabed, and measurements of water column properties.
Supplemental_Information:
Additional information regarding the field activity can be obtained from https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-009-FA.
  1. How might this data set be cited?
    Valentine, Page C., 2019, Navigation data collected on Stellwagen Bank during U.S. Geological Survey field activity 2017-009-FA, aboard the R/V Auk, Jan 30, 2017: data release DOI:10.5066/P9THIZBB, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Valentine, Page C., and Cross, VeeAnn A., 2019, Sea Floor Sediment Samples, Seabed Imagery, and CTD Water Column Data Collected on Stellwagen Bank in January 2017, U.S. Geological Survey Field Activity 2017-009-FA: data release DOI:10.5066/P9THIZBB, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details:
    Suggested citation: Valentine, P.C., and Cross, V.A., 2019, Sea floor sediment samples, seabed imagery, and CTD water column data collected on Stellwagen Bank in January 2017, U.S. Geological Survey Field Activity 2017-009-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P9THIZBB .
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -70.66034
    East_Bounding_Coordinate: -70.22766
    North_Bounding_Coordinate: 42.19971
    South_Bounding_Coordinate: 41.29025
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 30-Jan-2017
    Currentness_Reference:
    ground condition of when data were collected
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: tabular digital data
  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 0.00001. Longitudes are given to the nearest 0.00001. 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?
    navigation log in Excel spreadsheet and CSV format
    The Excel spreadsheet has a header (in row 1) explaining the columns of information, row 2 has the header names, row 3 has header names that are appropriate for incorporation into a GIS (shorter names, no punctuation, and the header row of the CSV file) and the remaining rows contain the data in 11 columns. The labels below are the CSV row headers with the first part of the attribute definition the longer Excel header on row 2 of the Excel spreadsheet. (Source: U.S. Geological Survey)
    VESSEL
    Vessel name: The name of the ship that the field activity used for the cruise. The R/V Auk is the Stellwagen Bank National Marine Sanctuary research vessel - a 50 foot catamaran. (Source: U.S. Geological Survey) Text field.
    CRUISE_ID
    WHCMSC field activity number: The field activity number assigned to the cruise by the Woods Hole Coastal and Marine Science Center. The number is in the format YYYY-XXX where YYYY is the year and XXX is the number activity in that year. (Source: U.S. Geological Survey) Text field.
    UTC_DATE
    Date, UTC: The date of the row of data collection based on UTC (coordinated universal time) time. In the Excel spreadsheet, the date has the format of D-M-YYYY where D is the numeric day of the month, M is the month abbreviation, and YYYY is the year. (Source: U.S. Geological Survey) Text field.
    UTC_JD
    Julian Day, UTC: Julian day is the integer number representing the interval of time in days since January 1 of the year of collection. (Source: U.S. Geological Survey) Text field presented as a number.
    TIMEZONE
    Study area time zone: The time zone in which the study area is located. The time zone of the survey is dependent on the survey date. (Source: U.S. Geological Survey)
    ValueDefinition
    ESTEastern Standard Time. To derive EST, subtract 5 hours from the UTC time.
    Time-UTC-HHMMSS
    Time, UTC, HHMMSS: The time of the navigation fix in the format HHMMSS where HH is hour, MM is minutes, and SS is seconds. The times are UTC (coordinated universal time). (Source: U.S. Geological Survey) Text field presented as a number.
    DDMM_LAT
    Lat N, DDMM.MMMM: The latitude coordinate in the format DDMM.MMMM where DD is degrees and MM.MMMM is decimal minutes. The "N" refers to northern latitude. (Source: U.S. Geological Survey) Text field presented as a number.
    DDMM_LON
    Lon W, DDMM.MMMM: The longitude coordinate in the format DDMM.MMMM where DD is degrees and MM.MMMM is decimal minutes. The "W" refers to western longitude and serves the place of having a negative value. (Source: U.S. Geological Survey) Text field presented as a number.
    LATITUDE
    Lat N, decimal degrees: The latitude coordinate in decimal degrees, positive values indicate northern hemisphere. (Source: U.S. Geological Survey)
    Range of values
    Minimum:41.29025
    Maximum:42.19971
    Units:decimal degrees
    LONGITUDE
    Lon W, decimal degrees: The longitude coordinate in decimal degrees, negative values indicate the western hemisphere. (Source: U.S. Geological Survey)
    Range of values
    Minimum:-70.66034
    Maximum:-70.22766
    Units:decimal degrees
    AREA
    Region: The area of the survey. (Source: U.S. Geological Survey)
    ValueDefinition
    SBNMSStellwagen Bank National Marine Sanctuary
    Entity_and_Attribute_Overview:
    The attribute label is the abbreviated label that is more compatible with importing the dataset into a GIS. The first part of the attribute definition is the longer label of the column that is in the second row of the Excel spreadsheet.
    The Excel spreadsheet has the following information in the first row describing the spreadsheet.
    
    
    GPS navigation log: Column A, vessel name, AUK, SBNMS research vessel; column B, field activity number; column C, date, UTC; column D, Julian Day, UTC; column E, study area time zone; column F, time, UTC (for Eastern Standard Time substract 5 hours); column G, latitude north, degrees and decimal minutes; column H longitude west, degrees and decimal minutes; column I, latitude north, decimal degrees; column J, longitude west, decimal degrees; column K, geographic region [abbreviations: D, degrees; H, hour; M, minute; S, second; EST, Eastern Standard Time; lat, latitude; lon, longitude; WHCMSC, USGS Woods Hole Coastal and Marine Science Center; SBNMS, Stellwagen Bank National Marine Sanctuary; UTC, coordinated universal (Greenwich Mean Time, ZULU time); GPS, satellite-based Global Positioning System receiver]
    
    
    The columns of data are the same as represented in the entity and attribute detail information.
    
    
    The files with the same prefix name, but the CSV extension are exported from the Excel spreadsheet, minus the first two rows of information.
    
    
    The *_raw.csv files are the original $GPGGA strings off the ship. An example row from that file is:
    
    
    $GPGGA,123058,4158.6481,N,7039.2771,W
    
    
    The format of the columns of information are as follows:
    
    
    $GPGGA, UTC time, latitude (DDMM.MMMM), latitude hemisphere, longitude (DDMM.MMMM), longitude hemisphere.
    
    
    The first row in the *raw.csv file contains the filename and not the column headers.
    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)
    • Page C. Valentine
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U.S. Geological Survey
    Attn: Page C. Valentine
    Research Geologist
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    (508) 548-8700 x2239 (voice)
    (508) 457-2310 (FAX)
    pvalentine@usgs.gov

Why was the data set created?

These navigation data are provided as an archive of the navigation data files acquired during the survey in the original collected format as well as in reformatted CSV and XLSX formats. The reformatted files add additional information, and most significantly provide that navigation in decimal degrees.

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: 30-Jan-2017 (process 1 of 4)
    The files *_raw.csv are the $GPGGA strings of the raw navigation recorded on the ship each day.
    
    
    The format of the columns of information are as follows:
    
    
    $GPGGA, UTC time, latitude (DDMM.MMMM), latitude hemisphere, longitude (DDMM.MMMM), longitude hemisphere.
    
    
    The first row in the file contains the filename and not the column headers of the data. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Page C. Valentine
    Research Geologist
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    (508) 548-8700 x2239 (voice)
    (508) 457-2310 (FAX)
    pvalentine@usgs.gov
    Date: 2018 (process 2 of 4)
    The $GPGGA strings have the latitude/longitude in the format DDMM.MMMMM with the hemisphere indicated (N for North and W for West). These data were brought into an Excel spreadsheet and converted to decimal degrees using the following formula examples:
    
    
    latitude: (4211.9672-4200)/60+(42) to give 42.19945 decimal degrees
    
    
    longitude: ((7043.2105-7000)/60+70‚Äč)*-1 to give -70.72018 decimal degrees
    
    
    Additional fields of information were added to the spreadsheet and are defined in the entity and attribute section, as well as within header information in each spreadsheet. The first row is an explanation header, the second row contains descriptive column headers, and the third row contains brief column headers that are compatible with importing the data into a GIS.
    The filenames indicate the cruise and day of navigation. The reformatted version of the navigation excludes the transit navigation between the port and the study area. The original GPGGA navigation filenames are in the format AUK2017009_XXXX_UTC_nav_raw.csv where XXXX is the day of navigation (for example 30jan2017). The filenames of the reformatted navigation are in the format AUK2017043_station_nav_log_XXXX_UTC where XXXX is the day of navigation (for example 30JAN2017); the filename suffix is either XLSX or CSV. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Page C. Valentine
    Research Geologist
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    (508) 548-8700 x2239 (voice)
    (508) 457-2310 (FAX)
    pvalentine@usgs.gov
    Date: 2018 (process 3 of 4)
    The spreadsheet was opened in Excel (2010). The first row (the explanation header) and the second row (descriptive column headers) were deleted and the third row (brief column headers that are compatible with importing the data into a GIS) was retained. Then the spreadsheet was exported as an MS-DOS CSV file. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 08-Sep-2020 (process 4 of 4)
    Added keywords section with USGS persistent identifier as theme keyword. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@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?
  2. How accurate are the geographic locations?
    The location information for stations was acquired from a satellite navigation receiver (Furuno satellite compass SC-30, GPS receiver) at two second intervals with a horizontal accuracy of 10 m. The navigation antenna is located 5.3 m forward of the SEABOSS deployment location. This offset was not accounted for in the navigation acquisition (navigation fixes represent antenna location).
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    The raw navigation files (with the $GPGGA string) represent all the navigation acquired on the cruise. These files are the original files handed over to the scientist. The reformatted navigation files have removed the transit navigation to and from port to the study area. No other navigation fixes were removed, which could include bad navigation fixes and duplicates.
  5. How consistent are the relationships among the observations, including topology?
    The navigation was downloaded at the end of the cruise and is available in the original GPGGA format as well as reformatted for easier use. The filenames indicate the cruise and day of navigation. The reformatted version of the navigation excludes the transit navigation between the port and the study area. The original GPGGA navigation filenames are in the format AUK2017009_XXXX_UTC_nav_raw.csv where XXXX is the day of navigation (for example 30jan2017). The filenames of the reformatted navigation are in the format AUK2017009_station_nav_log_XXXX_UTC where XXXX is the day of navigation (for example 30JAN2017). The filename suffix is either XLSX or CSV.

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: None.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    Attn: Page C. Valentine
    Research Geologist
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    (508) 548-8700 x2239 (voice)
    (508) 457-2310 (FAX)
    pvalentine@usgs.gov
  2. What's the catalog number I need to order this data set? 2017-009-FA_nav.zip contains the navigation acquired on the cruise. The following file is the original $GPGGA navigation: AUK2017009_30jan2017_UTC_nav_raw.csv. The reformatted navigation are available in XLSX format and CSV. The files are as follows: AUK2017009_station_nav_log_30JAN2017_UTC.xlsx, AUK2017009_station_nav_log_30JAN2017_UTC.csv. In addition to the navigation files, the zip file contains the FGDC CSDGM metadata in TXT, XML, and HTML formats.
  3. What legal disclaimers am I supposed to read?
    Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    The zip file contains data in XLSX and CSV formats. The user must have software capable of uncompressing the zip file and reading the data formats.

Who wrote the metadata?

Dates:
Last modified: 08-Sep-2020
Metadata author:
U.S. Geological Survey
Attn: VeeAnn A. Cross
Marine Geologist
384 Woods Hole Rd.
Woods Hole, MA

508-548-8700 x2251 (voice)
508-457-2310 (FAX)
vatnipp@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

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