Location of bottom video tracklines collected during field activity 2011-015-FA by the U.S. Geological Survey and Massachusetts Office of Coastal Zone Management offshore of Massachusetts around Cape Cod and the Islands in September 2011 (polyline shapefile)

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Frequently anticipated questions:


What does this data set describe?

Title:
Location of bottom video tracklines collected during field activity 2011-015-FA by the U.S. Geological Survey and Massachusetts Office of Coastal Zone Management offshore of Massachusetts around Cape Cod and the Islands in September 2011 (polyline shapefile)
Abstract:
Accurate data and maps of sea-floor geology are important first steps toward protecting habitat, delineating marine resources, and assessing environmental changes due to natural or human effects. Initiated in 2003, the primary objective of the Geologic Mapping of the Massachusetts Sea Floor program is to develop regional geologic framework information for the management of coastal and marine resources. The project is focused on the inshore waters (5–30 meters deep) of Massachusetts. This dataset is from U.S. Geological Survey (USGS) sampling survey 2011-015-FA (September 9–16, 2011) by the USGS Woods Hole Coastal and Marine Science Center and the Massachusetts Office of Coastal Zone Management with partners from the Massachusetts Division of Marine Fisheries and the U.S. Environmental Protection Agency aboard the ocean survey vessel Bold. During the survey, surficial sediment samples and bottom still and video imagery were collected in Cape Cod Bay, Buzzards Bay, and Vineyard Sound; south of Martha's Vineyard; and south and east of Nantucket, Massachusetts.
Supplemental_Information:
To view the bottom videos, see the Coastal and Marine Geology Program Video and Photograph Portal (Golden and others, 2015; link available from the cross-reference citation). Bottom still imagery was also taken at all but one station (see shapefile 2011-015-FA_photos.shp available from the larger work citation). Physical sediment samples were also collected at many stations and analyzed for grain size (see shapefile 2011-015-FA_samples.shp available from the larger work citation) and benthic infauna (see report by the Massachusetts Office of Coastal Zone Management [2012] available from the cross-reference citation). For more information about this field activity, see https://cmgds.marine.usgs.gov/fan_info.php?fan=2011-015-FA. For more information about the Geologic Mapping of the Massachusetts Sea Floor program, see https://woodshole.er.usgs.gov/project-pages/coastal_mass/.
  1. How might this data set be cited?
    U.S. Geological Survey, 2018, Location of bottom video tracklines collected during field activity 2011-015-FA by the U.S. Geological Survey and Massachusetts Office of Coastal Zone Management offshore of Massachusetts around Cape Cod and the Islands in September 2011 (polyline shapefile): data release DOI:10.5066/F73F4NVM, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts.

    Online Links:

    This is part of the following larger work.

    Huntley, Emily C., Ackerman, Seth D., Boeri, Robert L., Callaghan, Todd P., and Sampson, Daniel W., 2018, Sampling data collected in Cape Cod Bay, Buzzards Bay, and Vineyard Sound; south of Martha's Vineyard; and south and east of Nantucket, Massachusetts, in 2011, U.S. Geological Survey Field Activity 2011-015-FA: data release DOI:10.5066/F73F4NVM, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details:
    Suggested citation: Huntley, E.C., Ackerman, S.D., Boeri, R.L., Callaghan, T.P., and Sampson, D.W., 2018, Sampling data collected in Cape Cod Bay, Buzzards Bay, and Vineyard Sound; south of Martha's Vineyard; and south and east of Nantucket, Massachusetts, in 2011, U.S. Geological Survey Field Activity 2011-015-FA: U.S. Geological Survey data release, https://doi.org/10.5066/F73F4NVM.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -71.009868
    East_Bounding_Coordinate: -69.902650
    North_Bounding_Coordinate: 41.981100
    South_Bounding_Coordinate: 41.190828
  3. What does it look like?
    https://cmgds.marine.usgs.gov/data/field-activity-data/2011-015-FA/data/imagery/2011-015-FA_videos_browse.jpg (JPEG)
    Thumbnail image of bottom video locations offshore of Massachusetts.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 10-Sep-2011
    Ending_Date: 14-Sep-2011
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: vector digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • String (248)
    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 0.0000001. Longitudes are given to the nearest 0.0000001. 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?
    2011-015-FA_videos
    Locations of bottom video tracklines collected during USGS survey 2011-015-FA offshore of Massachusetts in 2011. (Source: U.S. Geological Survey)
    FID
    Internal feature number. (Source: Esri) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: Esri) Coordinates defining the features.
    FIELD_NO
    Station number as assigned in the field. Two sites were occupied twice on different days during the survey, so the station number for the data collected when they were occupied the second time ends in "0.2" (i.e., stations 81.2 and 95.2). (Source: U.S. Geological Survey) String used to distinguish station numbers.
    LINENAME
    Station number for the SEABOSS trackline along which continuous bottom video was acquired. Two sites were occupied twice on different days during the survey, so the station number for the data collected when they were occupied the second time ends in "0.2" (i.e., stations 81.2 and 95.2). Two stations (stations 83 and 123) have two SEABOSS bottom video tracklines, so the tracklines were named "a" and "b" to indicate back-to-back deployments at the same station (e.g., line names 83a and 83b). (Source: U.S. Geological Survey) String used to distinguish station numbers.
    STARTTIME
    Start time of the bottom video drift in UTC in the format HH:MM:SS. (Source: U.S. Geological Survey) String used to distinguish UTC start times of the bottom video.
    ENDTIME
    End time of the bottom video drift in UTC in the format HH:MM:SS. (Source: U.S. Geological Survey) String used to distinguish UTC end times of the bottom video.
    JD
    Julian day that the bottom video was collected based on UTC time; Julian day is the integer number representing the interval of time in days since January 1 of the year (2011 for these data). (Source: U.S. Geological Survey)
    Range of values
    Minimum:253
    Maximum:257
    Units:days
    Resolution:1
    DATE
    UTC date that the bottom video was collected in the format YYYYMMDD. (Source: U.S. Geological Survey) String used to distinguish dates.
    YEAR
    Year that the bottom video was collected (2011 for these data). (Source: U.S. Geological Survey)
    Range of values
    Minimum:2011
    Maximum:2011
    Units:years
    Resolution:1
    LENGTH_M
    Length in meters of the bottom video trackline. Length was calculated in WGS 84 UTM Zone 19N. (Source: U.S. Geological Survey)
    Range of values
    Minimum:2.7
    Maximum:109.6
    Units:meters
    Resolution:0.1
    CAMERA
    Camera used to collect bottom video. (Source: U.S. Geological Survey) String used to distinguish between different camera models mounted on the grab sampler; however, for this survey, only one camera was used to collect bottom video.
    CRUISE_ID
    USGS Woods Hole Coastal and Marine Science Center field activity identifier (e.g., 2011-015-FA where 2011 is the survey year, 015 is survey number of that year, and FA is Field Activity). (Source: U.S. Geological Survey) String used to distinguish cruises by year and ID number.
    DEVICE_ID
    Sampling device used to collect the bottom video. (Source: U.S. Geological Survey) String used to identify the sampling configuration used during the survey.
    VEHICLE_ID
    Vehicle (ship) used to collect data during survey 2011-015-FA. (Source: U.S. Geological Survey) String used to identify the survey vessel.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • U.S. Geological Survey
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Seth Ackerman
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 x2315 (voice)
    508-457-2310 (FAX)
    sackerman@usgs.gov

Why was the data set created?

This dataset is used to display the locations of bottom videos acquired with a Kongsberg Simrad OE1365 video camera on the SEABed Observation and Sampling System (SEABOSS) collected during USGS survey 2011-015-FA. Video data serve as a means to visually classify grain size and are especially important for sites where no physical sediment sample was collected.

How was the data set created?

  1. From what previous works were the data drawn?
    Bottom video and raw navigation files (source 1 of 1)
    U.S. Geological Survey, Unpublished Material, Bottom video and navigation data.

    Type_of_Source_Media: disc
    Source_Contribution:
    Bottom video was acquired using the large SEABOSS, where operational. The observations from video and still cameras and the sediment data are used to explore the nature of the sea floor and, in conjunction with high-resolution geophysical data, to make interpretive maps of sedimentary environments and validate acoustic remote sensing data. The SEABOSS incorporates two video cameras (one forward-looking so that a shipboard operator can monitor for proper tow depth and obstacles, and one downward-looking, a Kongsberg Simrad OE1365 video camera in this setup, that overlaps with the field of view of the still camera), a still camera, and a modified Van Veen sediment sampler. The elements of this particular SEABOSS system are held within a stainless-steel frame that measures 1.1 x 1.1 meters. The frame has a stabilizer fin that orients the system as it drifts over the seabed. The OSV Bold occupied one of the target stations and the SEABOSS was deployed off the vessel's A-frame on the stern of the ship. The vessel and sampler drifted with wind and current for up to a few minutes to ensure a decent image with a clear view of the sea floor and then at most stations the sea floor was sampled with the SEABOSS's integrated Van Veen grab. Sediment samples were only attempted in areas where collecting a sample would not damage the SEABOSS; therefore, no samples were collected in areas with a cobble, boulder, or rocky seabed, as identified in real time using the top-side live video feed. At some sites, samples were attempted one or more times in what appeared in the real-time video as sand or mud, but no sample was successfully collected. The system was then raised and recovered to the deck of the survey vessel. Bottom video was recorded from the Kongsberg Simrad OE1365 downward-looking video camera on Digital8 tapes and backup DVDs. The SEABOSS was only operational for 246 of the 322 stations occupied during this survey. The SEABOSS's still camera was occasionally malfunctioning, so use of the SEABOSS was halted partway through the survey and the remaining stations were occupied using the ship's Van Veen grab sampler equipped with a GoPro HD HERO camera and dive lights, but no video camera. DGPS navigation from a Garmin GPSMAP 76CSx receiver was logged through a Microsoft HyperTerminal (version 5.1) session on a Dell Latitude D820 laptop computer running Windows XP SP2 via serial cable. The DGPS was set to receive fixes at a two-second interval in geographic coordinates (World Geodetic System of 1984 [WGS 84]). Log files were saved for each sampling watch in ASCII text format.
  2. How were the data generated, processed, and modified?
    Date: Sep-2011 (process 1 of 7)
    Three hundred twenty-two stations were occupied aboard the OSV Bold during USGS survey 2011-015-FA with the large SEABOSS (Blackwood and Parolski, 2001), where operational, or the ship's Van Veen grab sampler. The SEABOSS was equipped with a Van Veen grab sampler, a still camera, and two video cameras (forward- and downward-looking). The OSV Bold occupied one of the target stations, the SEABOSS was deployed, and then the vessel and SEABOSS drifted with wind and current for up to a few minutes to ensure a decent video with a clear view of the sea floor. Bottom video was recorded from the Kongsberg Simrad OE1365 downward-looking video camera on Digital8 tapes and backup DVDs. The still camera was occasionally malfunctioning, so the SEABOSS was only operational for 246 of the 322 stations. The remaining stations were occupied using the ship's Van Veen grab sampler, which did not have a video camera. Person who carried out this activity:
    Seth Ackerman
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 x2315 (voice)
    508-457-2310 (FAX)
    sackerman@usgs.gov
    Data sources produced in this process:
    • Bottom video
    Date: Sep-2011 (process 2 of 7)
    DGPS navigation from a Garmin GPSMAP 76CSx receiver was logged through a Microsoft HyperTerminal (version 5.1) session on a Dell Latitude D820 laptop computer running Windows XP SP2 via serial cable. The DGPS was set to receive fixes at a two-second interval in geographic coordinates (WGS 84). Log files were saved for each sampling watch in ASCII text format. The original log files were reformatted into log files by full Julian day. An AWK script (awkseth.gpgga.sda) was run on the log files to parse for the GPGGA navigation string and create ASCII Comma Separated Value (CSV) text files. The output files were merged and then reformatted using an AWK script (nav_time_reformat.awk), creating a final processed navigation file for the entire sampling survey. Person who carried out this activity:
    Seth Ackerman
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 x2315 (voice)
    508-457-2310 (FAX)
    sackerman@usgs.gov
    Data sources used in this process:
    • Raw navigation files
    Data sources produced in this process:
    • Processed two-second navigation file
    Date: Mar-2014 (process 3 of 7)
    Bottom video was originally recorded on Digital8 tapes and backup DVDs. Each tape was played back and imported to a separate iMovie project (version iMovie HD 6). Within iMovie, each individual SEABOSS deployment was separated as its own video clip. In order to batch export all of the clips for a particular iMovie project, a Perl script (parse_iMovie_XML_Mar2014.pl) was run to parse the iMovie XML project file and create a shell script (do_convert.sh). Each line of the shell script was a one-liner command to run the program FFmpeg (version 0.11) with video and audio codec parameters (libx264 and libfaac, respectively) and output a video file named by station number. The shell script was run for each iMovie project creating individual video clips for each station in the M4V file format. Person who carried out this activity:
    Seth Ackerman
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 x2315 (voice)
    508-457-2310 (FAX)
    sackerman@usgs.gov
    Data sources used in this process:
    • Bottom video
    Data sources produced in this process:
    • Bottom video clips
    Date: Jun-2014 (process 4 of 7)
    Since the DGPS was set to receive fixes at a two-second interval, a MATLAB script (latlon_dc_seth.m) was run to interpolate the navigation to get one-second fixes. Person who carried out this activity:
    Seth Ackerman
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 x2315 (voice)
    508-457-2310 (FAX)
    sackerman@usgs.gov
    Data sources used in this process:
    • Processed two-second navigation file
    Data sources produced in this process:
    • One-second navigation file
    Date: Sep-2017 (process 5 of 7)
    A drift log was created by parsing and reformatting the manually kept Microsoft Excel survey log for station number, start date and time in Coordinated Universal Time (UTC), and end date and time in UTC for each video drift. The drift log was checked and modified as a number of stations had unreliable start and end times based on the manually kept log. To determine the correct start and end times, the program Horax (version 0.1) was used to extract the Society of Motion Picture and Television Engineers (SMPTE) start and end times from the audio, which has the navigation embedded in it, of each video file. The bottom video for three stations (stations 44, 304, and 340) was not recorded on the Digital8 tapes but was available on backup DVDs in the VOB file format. The DVD videos have an overlay of the Global Positioning System (GPS) time, date, latitude, and longitude, as well as a user-input station number. The DVD videos for these three stations were viewed in VLC media player (version 2.2.4) to verify the start and end times as shown on the overlay. This process step and all subsequent process steps were performed by the same person, Emily Huntley. Person who carried out this activity:
    Emily Huntley
    U.S. Geological Survey
    Geographer/Database Specialist
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 (voice)
    508-457-2310 (FAX)
    ehuntley@usgs.gov
    Data sources used in this process:
    • Survey log
    • Bottom video clips
    • Backup bottom video DVDs
    Data sources produced in this process:
    • Drift log
    Date: Sep-2017 (process 6 of 7)
    A polyline shapefile was created by using a Python script (seaboss_trackline_creator_v1_1.py) to join the drift log with the one-second navigation file. The Python script reads the start and end times from the drift log, extracts the navigation points that fall within those start and end times, and then creates a polyline shapefile from the navigation points with a unique line for each video drift. Data sources used in this process:
    • Drift log
    • One-second navigation file
    Data sources produced in this process:
    • Bottom video tracklines shapefile
    Date: Sep-2017 (process 7 of 7)
    XTools Pro (version 12.0) for Esri ArcGIS (version 10.3.1) was used to rename, reorganize, and add new fields (Table Operations - Table Restructure) to the polyline shapefile, including an attribute for the trackline length in meters (LENGTH_M), date of collection (DATE), year of collection (YEAR), camera used (CAMERA), survey ID (CRUISE_ID), sampling device used to collect the video (DEVICE_ID), and survey vessel (VEHICLE_ID). The field calculator in Esri ArcGIS (version 10.3.1) was used to calculate the date from the Julian day. The trackline length was calculated in Esri ArcGIS using the Calculate Geometry tool (Property=Length; Use coordinate system of the data frame=WGS 1984 UTM Zone 19N; Unit=Meters). Data sources used in this process:
    • Bottom video tracklines shapefile
    Data sources produced in this process:
    • Final bottom video tracklines shapefile
  3. What similar or related data should the user be aware of?
    Golden, Nadine E., Ackerman, Seth D., and Dailey, Evan T., 2015, Coastal and Marine Geology Program video and photograph portal: U.S. Geological Survey, Santa Cruz, CA.

    Online Links:

    Massachusetts Office of Coastal Zone Management, 2012, ENV12 CZM 01 Benthic Infaunal Analysis Report: Massachusetts Office of Coastal Zone Management, Boston, MA.

    Online Links:

    Blackwood, D., and Parolski, K., 2001, Seabed observation and sampling system: Sea Technology v. 42, no. 2, p. 39-43, Compass Publications, Inc., Arlington, VA.


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?
    Navigation for survey 2011-015-FA used DGPS. The recorded position of each point along the video trackline is the position of the DGPS antenna on the survey vessel, not the SEABOSS sampler. The antenna was at the top of the vessel's A-frame from which the sampler was deployed, within a few meters of the sampler. No layback or offset was applied to the recorded position. In addition to the +/- 3-meter offset, the sampler may drift away from the survey vessel when deployed to the sea floor. Based on the various sources of horizontal offsets, a conservative estimate of the horizontal accuracy of the video trackline locations is 3-10 meters. At times the boat was moving so slowly that the resolution of the DGPS makes a trackline appear to double back on itself.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Three hundred twenty-two stations were occupied within the study area, but the SEABOSS was only operational for 246 sites. The remaining stations were occupied using the ship's Van Veen grab sampler, which did not have a video camera. Two stations (stations 83 and 123) have two video tracklines, so the tracklines were named "a" and "b" to indicate back-to-back deployments at the same station (e.g., line names 83a and 83b). Some videos were clipped to the duration that the camera was within view of the sea floor. A total of 248 video tracklines are included in this dataset.
  5. How consistent are the relationships among the observations, including topology?
    All bottom videos were acquired using a Kongsberg Simrad OE1365 video camera on the SEABOSS. The station numbers (FIELD_NO) were determined before the survey and are not necessarily in sequential order of when they were occupied. Gaps in sequential station numbers exist as not all planned stations were occupied during the survey. Two sites were occupied twice on different days during the survey, so the station number for the data collected when they were occupied the second time ends in "0.2" (i.e., stations 81.2 and 95.2); these sites are considered unique stations (e.g., 81 and 81.2 are two different stations). Two stations (stations 83 and 123) have two SEABOSS bottom video tracklines, so the tracklines were named "a" and "b" to indicate back-to-back deployments at the same station (e.g., line names 83a and 83b). The tracklines may self-intersect or self-overlap; at times the boat was moving so slowly that the resolution of the Differential Global Positioning System (DGPS) makes a trackline appear to double back on itself.

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:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.
  1. Who distributes the data set? (Distributor 1 of 1)
    Seth Ackerman
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 x2315 (voice)
    508-457-2310 (FAX)
    sackerman@usgs.gov
  2. What's the catalog number I need to order this data set? USGS data release 2011-015-FA contains bottom video tracklines collected offshore of Massachusetts in Cape Cod Bay, Buzzards Bay, and Vineyard Sound; south of Martha's Vineyard; and south and east of Nantucket (2011-015-FA_videos.zip). The zip file contains the following files: a shapefile of the bottom video trackline locations (2011-015-FA_videos.shp); a browse graphic of bottom video trackline locations (2011-015-FA_videos_browse.jpg); and Federal Geographic Data Committee (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM) metadata files in three standard formats (2011-015-FA_videos_meta.html, 2011-015-FA_videos_meta.txt, and 2011-015-FA_videos_meta.xml).
  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?
    This zip file contains data available in polyline shapefile format. The user must have software capable of reading shapefile format to use these data.

Who wrote the metadata?

Dates:
Last modified: 15-Feb-2018
Metadata author:
Emily Huntley
U.S. Geological Survey
Geographer/Database Specialist
384 Woods Hole Rd.
Woods Hole, MA
USA

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

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