Equipment Description: The new TOAD sled body used for the 2004 data collection is constructed from a shortened Phantom ROV body with a tail piece added for stability. It is equipped with a Deep Sea Power and Light Multi SeaCam 2060 color video camera, two 500 W DeepSea Power and Light Multi-SeaLite model 1050 underwater lights, a sonar altimeter to detect the height of the camera above the seafloor, a pair of parallel lasers to determine the size/scale of viewed objects, a compass to determine the sled heading and orientation, and a depth (pressure) sensor. The video signal from the sled is send via a coaxial conductor within a 200 m long and 127 mm diameter umbilical cable to a topside control unit.
Name & address of person collecting data: Scott Ferguson NOAA PIFSC 1125B Ala Moana Blvd Honolulu, HI 98614
Data Files: Video data were recorded to digital video cassette using a video recorder mounted in the control console. Video backups were made at the end of each day. Hypack Max (version 2.12A) hydrographic survey software was used to record GPS data, water depth, length of umbilical cable in the water, and camera sled information (height, heading, etc.), which provide ship and camera sled positions for the duration of individual tows.
File naming convention: Each tow is given a name consisting of a three-letter designator for the island area, followed by a two-digit year and a three-digit tow number, which increments by one for each new tow around that island. For example, during HI0602 (NOAA Ship Hi'ialakai 2nd cruise in calendar year 2006) the consecutive tows at Ofu started at OFU06001. For subsequent cruises in the same year, the tow numbers will increment by 100, so the first tow on the next cruise to Ofu in 2006 will be tow number OFU06100. Video tape labels and paper log forms are also annotated with the tow name; if more than one tape is required for a tow, consecutive letters are added to the end of the tow number (OFU06100a, OFU06100b, OFU06100c...). Navigation files generated by Hypack Max follow the Hypack CHS filename format consisting of the year, the first two letters of the platform name, the Julian date, and the hour and minute in which the file was started, followed by the extension .raw. For example, a file begun at 1935 on Dec. 10, 2004 (Julian date 345) aboard the Carolinian would be 2004CA3451935.raw.
Time Correlation: All clocks were synchronized to UTC at the beginning of each day's operations. Two clocks were manually synchronized to GPS-derived times: the acquisition computer clock and the internal clock of the OSD-79 on-screen display unit.
Resource Description: Digital video imagery that is geo-referenced to navigation files.