Blackwood and Parolski, 2001
Sample, photographic and video navigation for locations 1, 2 and (up to time: 13:31 for location 3) used navigation from the video time stamp, as navigation was not recorded in HYPACK. HYPACK navigation was available for bottom sample 3 location and from 13:31 to the end of file for photographs and video at location 3.
With the mini-SEABOSS deployed, the research vessel was allowed to drift with occasional power from the vessel to control drift direction. Bottom photographs were acquired at user-selected locations along the drift. Video drift position was derived from the HYPACK navigation files based on start and end times. The drift navigation was merged with the digital photographs based on time of day.
Gaps in sequential photo numbers exist. If the camera was triggered accidentally on deck or the photograph was of poor quality or location (e.g. photograph within water column), the photograph was not saved.
Grab samples of the surficial sediment were collected at 15 stations, typically at the end of a drift. The upper 2 cm of sediment was scraped from the surface of the sample for texture analysis. Sediment samples were collected at locations with relatively fine-grained sediment (sand or mud). Samples were not collected in gravel or cobble areas where gravel prevented full closure of the sampler and resulted in a washed-out sample.
A total of 13 bottom samples were submitted for grain-size analysis. Two partially recovered, washed-out samples were not submitted. Grain-size analysis was performed at the USGS Sediment Laboratory at WHCMSC using methods described by Poppe and others (2005).
The mini-SEABOSS is housed with a Minolta CO., LTD, DiMAGE 7Hi camera. The full resolution of the acquired images is 2560 x 1920 pixels.
The EXIF header of the JPEG images contains the time the photo was taken (UTC times) as well as information about the camera used and resolution of the images.
Sample locations for sample 1 and 2 were read from the video time stamp, as HYPACK navigation was not available. The position information at the end of the video drift was used as position of the sample. (Samples were acquired at the end of video drifts).
Mac OS X (snow leopard 10.6.4)
vi, Mac OSX 10.6.4
A 'hyperlink' field was added to the attribute table and used to hotlink to the bottom photos.
Full resolution JPEG images were desampled in order to create an image set that would enable faster download.
The following command was used to resize the JPEG images:
convert -file.JPG -resize 25% file_sm.JPG
Mac OSX 10.6.4; convert
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
This zip file also contains desampled JPG images of the bottom samples. Full resolution bottom photographs are available upon request, or can be downloaded individually (<https://pubs.usgs.gov/of/2010/1035/gis_catalog/seaboss/photos/>).