Station and data summary for data collected by the U.S. Geological Survey on Stellwagen Bank during three surveys aboard the R/V Auk, September 2020 to August 2021

Sediment sampling methods:
As a part of the process of mapping the sea floor, the USGS developed the SEABed Observation and Sampling System (SEABOSS) to collect samples and video and photographic images of the seabed to aid in the interpretation of seabed sonar imagery. A modified Van Veen sediment grab sampler is mounted in the center of the SEABOSS frame, which ensures the sampler is properly oriented on the seabed when a sample is collected. Before deployment, the sampler bucket jaws are opened by collapsing the extended arms to a near-horizontal position and locking them in place with two catches. The sampler operates passively to sample the seabed; it is not spring loaded.
To collect a sediment sample, the SEABOSS frame was lowered gently onto the seabed, reducing tension on the cable, which caused the two locking catches to be automatically released by gravity. As the cable was retrieved, the grab sampler arms were pulled upward, closing the bucket around the sediment, and the SEABOSS was lifted off the seabed.
The SEABOSS was retrieved and set upon a wooden platform that kept the sampler bucket and camera systems above the deck. The sampler arms were held in the upright position manually or by tension on the cable, the two doors on the upper side of the bucket were opened, and the sediment surface was photographed before the sediment was removed. For this project, the upper 2 cm of sediment, representing the surface of the seabed, were removed with a rectangular shovel 2-cm deep and stored in a plastic bag for grain-size analysis. The remaining sediment was dumped into a tray on the deck below the sampler, after which the sampler was washed in preparation for sampling at the next site. The dumped sediment was sifted through for sandlance, which if found, were bagged and frozen for additional analyses by the SBNMS scientists. Further information on the SEABOSS can be found in Blackwood and Parolski (2001) and Valentine and others (2000).
Grain-size analyses of the sediment samples were performed at the sediment laboratory at the USGS Woods Hole Coastal and Marine Science Center in Woods Hole, Massachusetts, by using a standard suite of analytical methods (Poppe and others, 2014). This laboratory has been in operation since 1963 and has analyzed many thousands of sediment samples collected by the USGS in New England. The grain-size analyses of the sediment samples collected during these field activities is available from the larger work citation.
Video methods and data availability:
Seabed videos were collected using two battery-operated, high-definition (1920 x 1080 pixels) GoPro digital video camera mounted on the SEABOSS. The SEABOSS system also had a SeaViewer high-definition (1920 x 720 pixels), video camera attached to it with a live feed to the surface. It was mounted a little higher on the frame than the GoPros and was used to observe obstacles, like gill nets and lobster gear, in order to avoid entanglement. One of the GoPro cameras was selected as the primary source of video for this data release. In case of camera failure, the additional GoPro and SeaViewer cameras provided backup video. As the SEABOSS drifted over the seabed, the GoPro cameras imaged the seabed at a rate of 60 frames per second from an altitude of ~1 meter. Lighting was provided by two battery-operated Keldan LED dive lights. Each light provided a light flux of up to 9000 lumens at a correlated color temperature of 5000 Kelvins. Two parallel red lasers mounted 20 centimeters apart provided a scale in the video images.
GoPro video imagery includes the launch and recovery of the SEABOSS, transit through the water column, and the drift over the seabed. The duration of 168 individual video files ranges from 2 to 13.5 minutes. Video files are archived in .MP4 format and range in size from 0.2 to 3.0 gigabytes. The video files are not part of this data release, but they are archived at the USGS Woods Hole Coastal and Marine Science Center.
The position (latitude and longitude) and time were recorded from the navigation receiver by hand in the cruise log book (see the dataset cruise_logs_2020-2021 from the larger work citation of this data release). Consistently, the time when the SEABOSS reached the seabed, when a grab sample was attempted, and when it left the seabed was recorded in the log book. Some activities also recorded the time the instrument was deployed and recovered. Latitude and longitude positions recorded by hand in the log book were later adjusted to match the data recorded in the GPS navigation file. Video was recorded during the descent through the water column (1-2 minutes), during the drift over the seabed, and during the ascent to the surface.
Video frame grabs were captured to show typical images of the seabed. These images are available from the Larger Work citation.
The station position (latitude and longitude) represents the location of the sediment sample (if collected) as noted in the cruise log and then adjusted, if necessary, based on the GPS navigation data. If a sediment sample was not collected, the station position represents the end of the video drift.
Water depth was determined using a Simrad ES60, 120 kHz, single beam echosounder using a dual frequency 120-25 kHz transducer, which detects the seabed to a depth of 800 m. Depth values were recorded in a log book at the time of deployment of the SEABOSS and were rounded to the nearest meter to account for ship motion.
Data were collected from 2020 to 2021 with the process date representing the most recent acquisition year.

This information was manually entered into a Microsoft Excel (2016) spreadsheet with a column for each piece of information as described in the entity and attribute section of the metadata. 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 first and second rows do not appear in the CSV or shapefile versions of the dataset.
Data were collected from 2021 to 2021 with the process date representing the most recent acquisition year.

The individual Excel files from each cruise were combined into a single Excel file in Microsoft Excel O365. The data rows from each cruise were appended within the single file in chronological order.

The spreadsheet was opened in Microsoft Excel (O365). 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.

Using QGIS 3.16.7, the CSV file was converted to a shapefile within QGIS using Layer - Add Layer - Add delimited text layer. The CSV file was selected, with the x-coordinate set to STA_LON and the y-coordinate set to STA_LAT. The coordinate system of the input coordinates was set to the geographic coordinate system GCS_WGS_1984. Once the XY layer was added to QGIS, the data were then converted to a shapefile by right-clicking on the layer in the contents pane - Export - Save Features As. All of the features were exported using the layer's source data for the coordinate system. The output shapefile was exported as 2021-2021_station_data_summary.shp.