Navigation data collected on Stellwagen Bank during U.S. Geological Survey field activity 2017-043-FA, aboard the R/V Auk, Aug. 22 and 23, 2017 (geographic, WGS84)

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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 2017-043-FA, aboard the R/V Auk, Aug. 22 and 23, 2017 (geographic, WGS84)
Abstract:
This field activity is part of an 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-scale) interpretive maps, based on multibeam sonar data and seabed sampling, showing surficial geology and seabed sediment dynamics. The data collected in this study will aid research on the ecology of fish and invertebrate species that inhabit the region. On August 22 and 23, 2017, the U.S. Geological Survey, in collaboration with the Stellwagen Bank National Marine Sanctuary, conducted a research cruise aboard the Sanctuary’s Research Vessel Auk, visiting 39 locations within the sanctuary. A customized Van Veen grab sampler (SEABOSS) equipped with a video camera and a conductivity, temperature, and depth (CTD) instrument 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 this field activity is available from https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-043-FA.
The bounding coordinates presented in this metadata file are for the navigation as a whole. The raw navigation files include transit locations. The reformatted navigation excludes the transits and therefore has the reduced bounds of:
West Bounding Coordinate: -70.41192 East Bounding Coordinate: -70.22456 North Bounding Coordinate: 42.19542 South Bounding Coordinate: 42.08368
  1. How might this data set be cited?
    Valentine, Page C., 2018, Navigation data collected on Stellwagen Bank during U.S. Geological Survey field activity 2017-043-FA, aboard the R/V Auk, Aug. 22 and 23, 2017 (geographic, WGS84): data release DOI:10.5066/P9A57QWI, 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., 2018, Sea-Floor Sediment Samples, Seabed Imagery, and CTD Instrument Data Collected on Stellwagen Bank in August 2017, U.S. Geological Survey Field Activity 2017-043-FA: data release DOI:10.5066/P9A57QWI, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details:
    Suggested citation: Valentine, P.C., and Cross, V.A., 2018, Sea-floor sediment samples, seabed imagery, and CTD instrument data collected on Stellwagen Bank in August 2017, U.S. Geological Survey Field Activity 2017-043-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P9A57QWI.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -70.720810
    East_Bounding_Coordinate: -70.224550
    North_Bounding_Coordinate: 42.202700
    South_Bounding_Coordinate: 42.046210
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 22-Aug-2017
    Ending_Date: 23-Aug-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 an Excel spreadsheet format
    Each Excel spreadsheet has a header (in row 1) explaining the columns of information, row 2 has the header names, and row 3 has header names that are appropriate for incorporation into a GIS (shorter names, no punctuation) and the remaining rows contain the data in 11 columns. (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 activity number 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. (Source: U.S. Geological Survey)
    ValueDefinition
    EDTEastern Daylight Time. To derive EDT, subtract 4 hours from the UTC time.
    UTC_TIME
    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) Number represented as a text field.
    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) Number represented as a text field.
    LATITUDE
    Lat N, decimal degrees: The latitude coordinate in decimal degrees. The "N" refers to northern latitude. (Source: U.S. Geological Survey)
    Range of values
    Minimum:42.08368
    Maximum:42.1952
    Units:decimal degrees
    LONGITUDE
    Lon W, decimal degrees: The longitude coordinate in decimal degrees. The "W" refers to western longitude and serves the same purpose as the values being negative. (Source: U.S. Geological Survey)
    Range of values
    Minimum:-70.41192
    Maximum:-70.22456
    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 in row three of the Excel spreadsheet 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 Daylight Time subtract 4 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; EDT, Eastern Daylight 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 LATITUDE and LONGITUDE range of values are the values for the reformatted data that does not include transits. These values differ from the spatial domain bounding coordinates which represent the complete dataset - including the raw navigational data which contains the transit locations.
    The *_raw.csv files are the original $GPGGA strings off the ship. 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 each file describes the file.
    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 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: 2017 (process 1 of 4)
    General file description:
    The files *_raw.csv are the $GPGGA strings of the raw navigation recorded on the ship each day. $GPGGA is a National Marine Electronics Association (NMEA) GPS string or sentence that indicates Global Positioning System fix data.
    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 each file describes the file. 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: 2017 (process 2 of 4)
    The $GPGGA strings have the latitude/longitude in the decimal minute format DDMM.MMMMM with the hemisphere indicated (N for North and W for West). These data were brought into an Excel (version 2013) 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​)*-1 to give -70.72018 decimal degrees with negative for western hemisphere.
    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 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 AUK2017043_XXXX_UTC_nav_raw.csv where XXXX is the day of navigation (for example 22aug2017). 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 22AUG2017); 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: 2017 (process 3 of 4)
    The spreadsheet was opened in Excel (2013). 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: 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: 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 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 orignal files handed over to the scientist. The reformatted navigation files have removed the transit navigation to and from port to the study area. Of note - duplicate navigation fixed (same time and fix) that occur in the navigation files have not been removed. Both the original navigation and the reformatted navigation have 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 AUK2017043_XXXX_UTC_nav_raw.csv where XXXX is the day of navigation (for example 22aug2017). 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 22AUG2017); 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? 2017-043-FA_nav.zip contains the navigation acquired on the cruise. The following files are the original $GPGGA navigation: AUK2017043_22aug2017_UTC_nav_raw.csv, AUK2017043_23aug2017_UTC_nav_raw.csv. The reformatted navigation are available in XLSX format and CSV. The files are as follows: AUK2017043_station_nav_log_22AUG2017_UTC.xlsx, AUK2017043_station_nav_log_22AUG2017_UTC.csv, AUK2017043_station_nav_log_23AUG2017_UTC.xlsx, AUK2017043_station_nav_log_23AUG2017_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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