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.
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.
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: Unpublished Material
Title: Bottom video and navigation data
Geospatial_Data_Presentation_Form: video and tabular digital data
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20110910
Ending_Date: 20110914
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: Bottom video and raw navigation files
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.
Process_Step:
Process_Description:
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.
Process_Date: 201109
Source_Produced_Citation_Abbreviation: Bottom video
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Seth Ackerman
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2315
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: sackerman@usgs.gov
Process_Step:
Process_Description:
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.
Source_Used_Citation_Abbreviation: Raw navigation files
Process_Date: 201109
Source_Produced_Citation_Abbreviation: Processed two-second navigation file
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Seth Ackerman
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2315
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: sackerman@usgs.gov
Process_Step:
Process_Description:
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.
Source_Used_Citation_Abbreviation: Bottom video
Process_Date: 201403
Source_Produced_Citation_Abbreviation: Bottom video clips
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Seth Ackerman
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2315
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: sackerman@usgs.gov
Process_Step:
Process_Description:
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.
Source_Used_Citation_Abbreviation: Processed two-second navigation file
Process_Date: 201406
Source_Produced_Citation_Abbreviation: One-second navigation file
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Seth Ackerman
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2315
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: sackerman@usgs.gov
Process_Step:
Process_Description:
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.
Source_Used_Citation_Abbreviation: Survey log
Source_Used_Citation_Abbreviation: Bottom video clips
Source_Used_Citation_Abbreviation: Backup bottom video DVDs
Process_Date: 201709
Source_Produced_Citation_Abbreviation: Drift log
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Emily Huntley
Contact_Organization: U.S. Geological Survey
Contact_Position: Geographer/Database Specialist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: ehuntley@usgs.gov
Process_Step:
Process_Description:
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.
Source_Used_Citation_Abbreviation: Drift log
Source_Used_Citation_Abbreviation: One-second navigation file
Process_Date: 201709
Source_Produced_Citation_Abbreviation: Bottom video tracklines shapefile
Process_Step:
Process_Description:
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).
Source_Used_Citation_Abbreviation: Bottom video tracklines shapefile
Process_Date: 201709
Source_Produced_Citation_Abbreviation: Final bottom video tracklines shapefile
Process_Step:
Process_Description:
Added keywords section with USGS persistent identifier as theme keyword.
Process_Date: 20200908
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
