/* DATA DESCRIPTION:
Citation:	Hehemann, Laura; Purser, Autun; Hoge, Ulrich; Wenzhöfer, Frank (2018): OFOBS Seafloor images from the margins of the Atacama Trench, collected during RV SONNE cruise SO261 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.894734
Abstract:	The Ocean Floor Observation and Bathymetry System (OFOBS) was used during the SO261 cruise to the Atacama Trench, Chile, to image the seafloor at 4,000 - 6,000 m depth, on the eastern and western margins of the trench. 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 intergrated 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 newly 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 the profiles that vary in length depending on duration of the cast. 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.
	During this cruise there was considerable interest in sampling with MOCHNESS trawl from within the water column. In light of this, the seafloor images in this dataset are bracketed in some cases with images collected from within the water column, at the request of the cruise participants.
Coverage:	MEDIAN LATITUDE: -22.803392 * MEDIAN LONGITUDE: -71.293625 * SOUTH-BOUND LATITUDE: -24.197803 * WEST-BOUND LONGITUDE: -71.702051 * NORTH-BOUND LATITUDE: -20.332427 * EAST-BOUND LONGITUDE: -70.970545
	DATE/TIME START: 2018-03-07T09:23:16 * DATE/TIME END: 2018-03-28T23:59:35
License:	Creative Commons Attribution 4.0 International (CC-BY-4.0) (URI: https://creativecommons.org/licenses/by/4.0/)
Size:	7 datasets
*/
/* TABULAR SUMMARY OF DATASETS LISTED IN THIS COLLECTION: */
Filename	Citation of child dataset
SO261_14-1_links-to-images.tab	Hehemann, Laura; Purser, Autun; Hoge, Ulrich; Wenzhöfer, Frank (2018): Seabed photographs taken along OFOBS profile SO261_14-1 during SONNE cruise SO 261. https://doi.org/10.1594/PANGAEA.894725
SO261_26-1_links-to-images.tab	Hehemann, Laura; Purser, Autun; Hoge, Ulrich; Wenzhöfer, Frank (2018): Seabed photographs taken along OFOBS profile SO261_26-1 during SONNE cruise SO 261. https://doi.org/10.1594/PANGAEA.894726
SO261_53-1_links-to-images.tab	Hehemann, Laura; Purser, Autun; Hoge, Ulrich; Wenzhöfer, Frank (2018): Seabed photographs taken along OFOBS profile SO261_53-1 during SONNE cruise SO261. https://doi.org/10.1594/PANGAEA.894729
SO261_66-1_links-to-images.tab	Hehemann, Laura; Purser, Autun; Hoge, Ulrich; Wenzhöfer, Frank (2018): Seabed photographs taken along OFOBS profile SO261_66-1 during SONNE cruise SO261. https://doi.org/10.1594/PANGAEA.894730
SO261_78-1_links-to-images.tab	Hehemann, Laura; Purser, Autun; Hoge, Ulrich; Wenzhöfer, Frank (2018): Seabed photographs taken along OFOBS profile SO261_78-1 during SONNE cruise SO261. https://doi.org/10.1594/PANGAEA.894731
SO261_90-1_links-to-images.tab	Hehemann, Laura; Purser, Autun; Hoge, Ulrich; Wenzhöfer, Frank (2018): Seabed photographs taken along OFOBS profile SO261_90-1 during SONNE cruise SO261. https://doi.org/10.1594/PANGAEA.894732
SO261_109-1_links-to-images.tab	Hehemann, Laura; Purser, Autun; Hoge, Ulrich; Wenzhöfer, Frank (2018): Seabed photographs taken along OFOBS profile SO261_109-1 during SONNE cruise SO261. https://doi.org/10.1594/PANGAEA.894733
