OFOBS Seafloor images from the Antarctic Peninsula and Powell Basin, collected during RV POLARSTERN cruise PS118

During the RV POLARSTERN cruise to the Antarctic Peninsula and Powell Basin during Feb - April 2019 the Ocean Floor Observation and Bathymetry System (OFOBS) was used to collect still and video images, as well as sidescan data, from various locations surveyed during the research cruise. The OFOBS sy...

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Bibliographic Details
Main Authors: Purser, Autun, Hehemann, Laura, Dreutter, Simon, Dorschel, Boris, Nordhausen, Axel
Format: Dataset
Language:English
Published: PANGAEA 2020
Subjects:
Antarctica
Antarctic Peninsula
Corals
OFOBS
OFOS
seafloor images
Sponges
Antarctic
Powell Basin
The Antarctic
Antarc*
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.911904
https://doi.org/10.1594/PANGAEA.911904
Description
Summary:During the RV POLARSTERN cruise to the Antarctic Peninsula and Powell Basin during Feb - April 2019 the Ocean Floor Observation and Bathymetry System (OFOBS) was used to collect still and video images, as well as sidescan data, from various locations surveyed during the research cruise. The OFOBS system consisted of a towed underwater camera system equipped with both a high-resolution photo-camera (iSiTEC, CANON EOS 5D Mark III) and a high-definition video-camera (iSiTEC, Sony FCB-H11) as well as an integrated sidescan sonar system. The cameras were mounted on a steel frame (140L x 92W x 135H cm), together with two strobe lights (iSiTEC UW-Blitz 250, TTL driven), three laser pointers spaced with a distance of 50 cm used to estimate the size of seafloor structures, four LED lights, and a USBL positioning system (Posidonia) to track the position of the OFOBS during deployments, with additional positioning information provided by the integrated INS and DVL systems. In automatic mode, a seabed photo, depicting an area of approximately 4 m**2, with variations depending on the actual height above ground, was taken every ~15 seconds to obtain series of "TIMER" stills distributed at regular distances along each of the survey profiles. Profile lengths varied in length depending on duration of the cast, usually determined by the current ice and sea state conditions at time of survey. At a ship speed of 0.5 kn, the average distance between seabed images was approximately 5 m. Ship speed was however greatly influenced by ice conditions. Additional "HOTKEY" photos were taken from interesting objects (organisms, seabed features, etc) when they appeared in the live video feed.

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