Optical validation data were collected using a Tethered Optical Assessment Device (TOAD), an underwater sled equipped with an underwater digital video camera, digital still camera and lights, and a drop camera system equipped with underwater digital video camera, digital still camera and lights in the Kohala coast area of northwest Hawai'i island. Data were collected using the camera sled deployed from the Hawai'ian Islands Humpback Whale National Marine Sanctuary small boat the R/V Kohola during the first 8 days of survey, while the drop camera system was used on the Nature Conservancy R/V Kaka for the final 4 days of survey during May 2015.
These data provide optical observations that have been used to provide information on the distribution of coral communities and other benthic cover along the west coast of Hawai'i.
The island of Hawai'i is the southernmost island of the Hawai'ian archipelago. It is also the largest island with a land area of nearly 10,500 sq km. It is the youngest island of the archipelago with ongoing volcanic activity. Operations Description: From May 21- June 2, 2015, CRED personnel conducted towed optical surveys along the Kohala coast of Hawai'i, between Kawaihae and Mahaiula Bay. The towed camera sled was deployed from the R/V Kohola, an 11m AMBAR vessel. Operations were conducted during daylight hours, with seafloor imagery collected using an underwater camera sled, designed and fabricated by Deep Ocean Engineering, Inc. (DOE) and a drop camera system with video from a Splashcam and still imagery from a GoPro. Optical data were collected with underwater video and still cameras with lights. These data are used to provide ground-truth validation for benthic habitat maps based on multibeam echosounder surveys and to gather additional information regarding benthic and fish communities. Camera deployments were conducted during daylight hours, usually between 0800 and 1500. The duration of each TOAD tow varied, but averaged about 10 minutes of bottom time per tow. The drop camera system was deployed for an average of 3 minutes per tow. Both camera systems were deployed from the port side of the vessel. At each station the vessel was positioned with the wind on the port side and drifted downwind; occasional light turns were applied if necessary to reduce the vessel's motion or to ensure the tethered cable was clear of the outboard engines. The TOAD sled was lowered slowly to the bottom by a pot-hauler holding 200 m of cable, operated from a control station in the cabin of the vessel. The drop camera was deployed by hand using 40 of cable. For both systems, the operator monitored a live video feed from the camera system and began recording video onto media cards using a digital video recorder once the camera reached the bottom. The operator continued to monitor the video feed during the tow and raised or lowered the sled to maintain a 2m altitude above the seafloor. Equipment Description: TOAD Camera Sled: The TOAD sled body is constructed from a shortened Phantom ROV body with a tail piece added for stability. The camera sled is equipped with a Deep Sea Power & Light (DSP&L) Multi SeaCam 2060 low-light color video camera, angled downwards to provide imagery of the seabed while allowing some view of upcoming obstacles, and a downward-facing Ocean Imaging System 12000 digital still camera (consisting of a Nikon D90 digital SLR camera within an aluminum housing). Illumination for the video camera is provided by 50 watt DSP&L LED Multi SeaLites. Illumination for the still camera is provided by a remote flash head (Ocean Imaging Systems). A pair of parallel DSP&L SeaLaser 100 lasers provided a scale reference in still images. The sled also has a Tritech PA200 Altimeter to detect the height of the camera above the seafloor, a pressure (depth) sensor and a fluxgate compass, all installed inside the sled's electronics bottle. The camera sled was attached to the control console (situated in the boat cabin) via a 130 M length (0.5" diameter) umbilical cable, and was deployed via a pot-hauler with a 300lbs (SWL) capacity, mounted on the port deck of the vessel. A video display monitor mounted on the control console was used to monitor the position of the sled relative to the seafloor. Video data were recorded to digital files using a digital video recorder mounted on the control console. A serial cable was connected to a Garmin GPS, to provide position of the vessel. Hypack hydrographic software (version 2014) was used to record position data (from GPS) and time. The length of umbilical cable in the water was manually entered into Hypack, this in conjunction with the camera sled depth and vessel position was used to calculate layback and determine the latitude and longitude of the sled. The calculated position is then recorded in Hypack. Drop Camera: The drop camera consisted of a Deep Blue Pro Marine video Splashcam angled downwards to provide imagery of the seabed while allowing some view of upcoming obstacles and a downward-facing GoPro Hero 3+ still camera inside an extreme depth underwater housing. Illumination for the still camera was provided by two LED underwater lights. A pair of parallel lasers proveded a scale reference in still images. The drop camera was attached to a small monitor screen on deck via a 40 M length umbilical cable and was deployed by hand from the port deck of the vessel. A video display monitor was used to monitor the position of the sled reletive to the seafloor. Video data were recorded to digital files using a digital video recorder on deck. Still imagery was collected at 10 second intervals and recorded on an internal microSD card. A hand held Garmin 76Cx GPS unit was used to record the position of the vessel. Vessel movement was kept to a minimum to maintain a vertical angle on the umbilical cable. Data Files: Video data were recorded on media cards using a digital video recorder and later copied to external hard drive digital files. Still imagery were recorded onto media cards and copied to external hard drive digital files. The position of the TOAD camera sled was recorded using Hypack 2014 hydrogrpahic software. Position of the drop camera was recorded using the vessel track file from the Handheld Garmin GPS unit. File naming convention: Each tow is given a name consisting of a 3-letter designator for the island area followed by a two-digit year and three-digit tow number. During cruise SB1505 the tows were named HAW15103 to HAW15266. Digital videos, still images and paper log forms are annotated with the associated tow name. Data recorded using Hypack software are of the format 2015KOHHMMSS where HHMMSS is UTC time. Time Correlation: All times are based on UTC. Clocks were manually synchronized prior to starting data collection each day of operations. Resource Description: Digital video imagery that is geo-referenced to navigation files.
ground condition
Please acknowledge the NOAA Coral Reef Ecosystem Division, Pacific Islands Fisheries Science Center as the source of this information.
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The horizontal position accuracy for the camera sled position is estimated at 40 meters. There are two primary sources of this error. The vessel positioning is estimated at 25 m horizontal accuracy, and as vessel position was used for camera sled position (with measured offsets between the vessel point of origin and the pothauler applied), an additional inaccuracy comes from the distance of the camera sled from the horizontal position of the vessel.
After a tow was completed the video was reviewed by opening the video file to verify that data were recorded. Raw data files recorded using Hypack 2014 software that include time and vessel position, were copied from the acquisition computer to the data archive. Tow-specific metadata were recorded in a custom database. Raw Hypack data files were exported as comma-delimited text files which were then modified in Excel so that additional information could be added, before being imported into ArcGISv10.1 and saved as shapefiles. Additional depth data was extracted from underlying bathymetry using "Extract values to points" tool available in ArcGIS. The dbf of the shapefile was then imported into the TOAD database, which is a custom-built Access 2007 database. The benthic habitat for each tow was classified using the PIBHMC_tow classification scheme. Ten points were classified at 30 second intervals and codes were input directly into the TOAD database. The classified results were then exported as an excel spreadsheet and imported into ArcGIS v10.1, then saved as a shapefile. For more information on classificiation methods, refer to the PIBHMC website ftp://ftp.soest.hawaii.edu/pibhmc/website/webdocs/documentation/Optical-Proc_Overview.pdf For more information on the classification scheme,refer to the PIBHMC website ftp://ftp.soest.hawaii.edu/pibhmc/website/webdocs/documentation/Benth-Habitat-Class_Codes.htm
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These data are not to be used for navigational purposes. NOAA makes no warranty regarding these data, expressed or implied, nor does the fact of distribution constitute such a warranty. NOAA cannot assume liability for any damages caused by any errors or omissions in these data, nor as a result of the failure of these data to function on a particular system.
Each comma-delimited record contains information on the UTC date and time, horizontal position of the sled, and heading of the vessel over the period of time that the camera sled is in the water. List of navigation files: 2015KO1422322.RAW 2015KO1422352.RAW 2015KO1430000.RAW 2015KO1430019.RAW 2015KO1430045.RAW 2015KO1432048.RAW 2015KO1432124.RAW 2015KO1432213.RAW 2015KO1432241.RAW 2015KO1432315.RAW 2015KO1432357.RAW 2015KO1440000.RAW 2015KO1440024.RAW 2015KO1440048.RAW 2015KO1440120.RAW 2015KO1441829.RAW 2015KO1441859.RAW 2015KO1441920.RAW 2015KO1441948.RAW 2015KO1442012.RAW 2015KO1442039.RAW 2015KO1442101.RAW 2015KO1442227.RAW 2015KO1442246.RAW 2015KO1442306.RAW 2015KO1442332.RAW 2015KO1442349.RAW 2015KO1450000.RAW 2015KO1450031.RAW 2015KO1451933.RAW 2015KO1452001.RAW 2015KO1452033.RAW 2015KO1452056.RAW 2015KO1452116.RAW 2015KO1452142.RAW 2015KO1452204.RAW 2015KO1452232.RAW 2015KO1452255.RAW 2015KO1452315.RAW 2015KO1452330.RAW 2015KO1452357.RAW 2015KO1460000.RAW 2015KO1460012.RAW 2015KO1460031.RAW 2015KO1461850.RAW 2015KO1461913.RAW 2015KO1461934.RAW 2015KO1462000.RAW 2015KO1462023.RAW 2015KO1462049.RAW 2015KO1462113.RAW 2015KO1462139.RAW 2015KO1462155.RAW 2015KO1462217.RAW 2015KO1462239.RAW 2015KO1462303.RAW 2015KO1462327.RAW 2015KO1471754.RAW 2015KO1471820.RAW 2015KO1471849.RAW 2015KO1471913.RAW 2015KO1471931.RAW 2015KO1471953.RAW 2015KO1472010.RAW 2015KO1472039.RAW 2015KO1472056.RAW 2015KO1472136.RAW 2015KO1472205.RAW 2015KO1472228.RAW 2015KO1472248.RAW 2015KO1472310.RAW 2015KO1472335.RAW 2015KO1481827.RAW 2015KO1481846.RAW 2015KO1481902.RAW 2015KO1481928.RAW 2015KO1481954.RAW 2015KO1482035.RAW 2015KO1482109.RAW 2015KO1482135.RAW
16.5 h of video data are available covering 266 square km of seabed, recorded as 164 digital video clips. List of video tapes (masters on digital hard drive, and backups on DVD) HAW15170.AVI HAW15171.AVI HAW15172.AVI HAW15173.AVI HAW15174.AVI HAW15175.AVI HAW15176.AVI HAW15177.AVI HAW15178.AVI HAW15178B.AVI HAW15179.AVI HAW15180.AVI HAW15181.AVI HAW15182.AVI HAW15183.AVI HAW15184.AVI HAW15185.AVI HAW15186.AVI HAW15187.AVI HAW15188.AVI HAW15189.AVI HAW15190.AVI HAW15191.AVI HAW15191B.AVI HAW15192.AVI HAW15193.AVI HAW15194.AVI HAW15195.AVI HAW15196.AVI HAW15197.AVI HAW15198.AVI HAW15199.AVI HAW15200.AVI HAW15201.AVI HAW15202.AVI HAW15203.AVI HAW15204.AVI HAW15204b.AVI HAW15205.AVI HAW15206.AVI HAW15207.AVI HAW15208.AVI HAW15209.AVI HAW15210.AVI HAW15211.AVI HAW15212.AVI HAW15213.AVI HAW15214.AVI HAW15215.AVI HAW15216.AVI HAW15217.AVI HAW15218.AVI HAW15220.AVI HAW15221.AVI HAW15222.AVI HAW15223.AVI HAW15224.AVI HAW15225.AVI HAW15226.AVI HAW15227.AVI HAW15228.AVI HAW15229.AVI HAW15230.AVI HAW15231.AVI HAW15232.AVI HAW15233.AVI HAW15234.AVI HAW15235.AVI HAW15236.AVI HAW15237.AVI HAW15238.AVI HAW15239.AVI HAW15240.AVI HAW15241.AVI HAW15242.AVI HAW15243.AVI HAW15244.AVI HAW15245.AVI HAW15246.AVI HAW15247.AVI HAW15247B.AVI HAW15248.AVI HAW15249.AVI HAW15250.AVI HAW15251.AVI HAW15252.AVI HAW15253.AVI HAW15254.AVI HAW15255.AVI HAW15256.AVI HAW15257.AVI HAW15258.AVI HAW15259.AVI HAW15260.AVI HAW15261.AVI HAW15262.AVI HAW15263.AVI HAW15264.AVI HAW15265.AVI HAW15266.AVI
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