Towed Optical Assessment Device (TOAD) Data to Support Benthic Habitat Mapping since 2001

Metadata Updated: February 8, 2018

Optical validation data were collected using a Tethered Optical Assessment Device (TOAD), an underwater sled equipped with an underwater digital video camera and lights.

FROM OLDER RECORD: CRED TOAD Optical Validation Data in the Pacific Ocean

Optical validation data were collected using a Towed Optical Assessment Device (TOAD), an underwater sled equipped with an underwater digital video camera and lights, in the Pacific coral reef ecosystems where is deeper than the approximately 30 meters depth . These data are used to provide ground-truth validation for benthic habitat maps based on multibeam echosounder surveys. Data were collected around the islands/banks of the Main Hawaiian Islands, the Northwest Hawaiian Islands, American Samoa, the Commonwealth of Northern Mariana Islands (CNMI) and Guam, and the Pacific Remote Island Areas (PRIAs) to support Benthic Habitat Mapping efforts during NOAA Ship cruises.

Camera sled deployments were conducted at night, usually between 1800 and midnight, to avoid interfering with daytime small boat and diver operations. The duration of each tow varied but averaged about 40 minutes of bottom time at a given location. The TOAD was originally deployed from a pot hauler mounted on the starboard side of the fantail on NOAA Ship Townsend Cromwell. On the NOAA Ships O.E. Sette and Hi`ialakai various iterations of TOADs were deployed off the portside J-frame amidships or the starboard side J-frame respectively. In all cases the sleds were lowered slowly to the bottom by the deck crew with the use of a capstan. The TOAD operator monitored a live video feed from the camera and began recording data on two video tape recorders. When the camera reached bottom the deck crew was notified by radio to stop lowering, and the ship moved off along a predetermined course, towing the TOAD astern for the first TOAD, or by drifting with subsequent camera sleds.

Video data are recorded on a mini DV video tape recorder. Each tow video is given a name consisting of a 3-letter designator for the island area followed by two-digit year and three-digit tow number. For example, FFS08001 means the first tow video at French Frigate Shoals in calendar year 2008.

Access & Use Information

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Dates

Metadata Date June 14, 2017
Metadata Created Date January 16, 2016
Metadata Updated Date February 8, 2018
Reference Date(s) 2001 (publication)
Frequency Of Update asNeeded

Metadata Source

Harvested from NOAA CSW Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Date June 14, 2017
Metadata Created Date January 16, 2016
Metadata Updated Date February 8, 2018
Reference Date(s) 2001 (publication)
Responsible Party Pacific Islands Fisheries Science Center (Point of Contact, Custodian)
Contact Email
Access Constraints Access Constraints: None | Use Constraints: Please acknowledge the NOAA Coral Reef Ecosystem Division, Pacific Islands Fisheries Science Center as the source of this information. | Distribution Liability: While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
Bbox East Long -156.6797
Bbox North Lat 28.47207
Bbox South Lat -14.37157
Bbox West Long 144.44
Coupled Resource
Frequency Of Update asNeeded
Guid gov.noaa.nmfs.inport:12608
Harvest Object Id 411869ce-d9a6-4bc9-aae6-870fa137224f
Harvest Source Id 2aed8e29-fc5b-4cde-aa66-fb1118fd705e
Harvest Source Title NOAA CSW Harvest Source
Licence
Metadata Language eng
Metadata Type geospatial
Progress onGoing
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2001-09-13

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