Identification_Information: Citation: Citation_Information: Originator: NOAA Pacific Islands Fisheries Science Center, Coral Reef Ecosystem Division, Pacific Islands Benthic Habitat Mapping Center Publication_Date: 200512 Title: CRED Optical Validation Data at Arakane Bank in the Commonwealth of the Northern Mariana Islands, 2003 to Support Benthic Habitat Mapping Geospatial_Data_Presentation_Form: Video imagery, track line navigation files, and log sheets Online_Linkage: http://www.soest.hawaii.edu/pibhmc/ Description: Abstract: Optical validation data were collected using a Tethered Optical Assessment Device (TOAD), an underwater sled equipped with an underwater digital video camera and lights. Data were collected in the Commonwealth of the Northern Mariana Islands (CNMI), around 18 different islands and banks, to support Benthic Habitat Mapping efforts during NOAA Ship Oscar Elton Sette cruise OES0307, from August 22 through September 21, 2003. Purpose: These data provide optical observations that will be correlated with bathymetry and acoustic backscatter imagery to develop a benthic habitat map of Arakane Bank. Refer to supplemental information for description of instrument and survey. Supplemental_Information: Arakane Bank is located approximately 325 km west-northwest of Saipan in the West Mariana Arc. On NOAA's Nautical Chart 81004, it is identified by a single sounding of 5 fm (9 m). It is smaller than indicated on the chart and its true center is approximately 1 km southeast of the center of the charted bank. It was mapped in September 2003 using single-beam sonar and an underwater video camera during the NOAA MARAMP cruise. Encrusting and fleshy algae, hard and soft corals, and sand were seen on hard substrate ridges. Optical validation data were collected using the Tethered Optical Assessment Device (TOAD), a sled equipped with underwater video camera and lights. These data are used to provide ground-truth validation for benthic habitat maps based on multibeam echosounder surveys. Camera sled deployments were conducted at night, usually between 1800 and midnight. The duration of each tow varied but averaged about 40 minutes of bottom time at a given location. The camera sled was deployed from the port J-frame mounted amidships on the NOAA Ship Oscar Elton Sette. At each station the ship was positioned with the wind on the port side and drifted downwind; occasional light turns were applied to the ship's screws if necessary to reduce the ship's motion. The TOAD was lowered slowly to the bottom by the deck crew using a capstan. The operator monitored a live video feed from the camera and began recording data on a video tape recorder. When the camera reached bottom the deck crew was notified by radio to stop lowering. The operator continued to monitor the vehicle and provided commands to raise or lower it to keep the camera just above the bottom. Equipment Description: The TOAD was deployed from the lower arm of the vessel's port side J-frame. The TOAD is a camera sled based on the Guildline MiniBat model 8820 tow body. The frame has been extensively modified from its original configuration and was equipped with an ROS model 54-00100-13 color underwater video camera as the primary data collection instrument. The ROS camera was mounted to point at approximately a 45 degree angle toward the seafloor. A Deep Sea Power and Light model 2050 MultiSeaCam low-light color video camera was also mounted on the sled and aimed straight ahead. The signal from this camera was fed to a second video monitor to provide warning of underwater obstructions the sled might be headed for. Illumination was provided by two 500 W DeepSea Power & Light Multi-SeaLite model 1050 underwater lights mounted on the original sled frame. The lights were located near the base and each side of the sled to provide the maximum possible horizontal distance from the ROS camera. Cable between the sled and the surface consisted of a underwater electrical cable (cable 2, black in color) with an internal kevlar strength member to support the sled frame. The cable was led from the camera sled over a 22-inch diameter sheave hung from the J-frame, and from there around a gypsy head mounted on the alternate CTD winch, amidships on the vessel's port side. All TOAD surface components were located in the Dry Lab in an equipment rack on the after bulkhead. Name & address of person collecting data: John Rooney NOAA PIFSC 1125B Ala Moana Blvd Honolulu, HI 98614 Data Files: Video data were recorded on a video tape recorder. The position of the camera sled was recorded in WGS-84 using Guildline MiniBat In-Tow data acquisition software and a data feed from a shipboard Northstar Chartplotter. 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 a three-digit tow number, which increments by one for each new tow around that island. For Arakane Bank the designator is "ARA. "During OES0307 (NOAA Ship Oscar Elton Sette's 7th cruise in calendar year 2003) the consecutive numbers started at ARA03000. Video tape labels, the navigation files (*.glo) and paper log forms are annotated with the tow name and number, e.g., ARA03002. If the navigation file is edited during processing the file name has a suffix 'a' added. For example, for a navigation data file named "ARA03002a.glo," the 'a' would indicate that metadata were extracted from the navigation data and recorded to a file with the same name as the navigation file except that a file type of '.met' was appended; for example, 'ARA03002a.glo.met. Time Correlation: All times are based on UTC. Two clocks were manually synchronized prior to starting data collection; the clock in the video character generator that was used to annotate the video tape, and the clock in the TOAD data acquisition computer. These clocks were set to UTC at the beginning of each evening's operations. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20030915 Ending_Date: 20030915 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: 142.75 East_Bounding_Coordinate: 142.78 North_Bounding_Coordinate: 15.64 South_Bounding_Coordinate: 15.62 Keywords: Theme: Theme_Keyword_Thesaurus: CoRIS Theme Thesaurus Theme_Keyword: EARTH SCIENCE > Biosphere > Aquatic Habitat > Benthic Habitat Theme_Keyword: EARTH SCIENCE > Biosphere > Zoology > Corals > Reef monitoring and assessment > Mapping Theme_Keyword: EARTH SCIENCE > Biosphere > Zoology > Corals > Reef monitoring and assessment > Photographic analysis > Videography Theme: Theme_Keyword_Thesaurus: CoRIS Discovery Thesaurus Theme_Keyword: Visual Images > Habitats Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Tethered Optical Assessment Device (TOAD) Theme_Keyword: Underwater video Theme_Keyword: OES0307 Theme: Theme_Keyword_Thesaurus: ISO 19115:2003 MD_TopicCategoryCode Theme_Keyword: environment Theme_Keyword: biota Place: Place_Keyword_Thesaurus: CoRIS Place Thesaurus Place_Keyword: OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Arakane Reef > Arakane Reef (15N141E0001) Place_Keyword: COUNTRY/TERRITORY > Northern Mariana Islands > Northern Mariana Islands > Arakane Reef (15N141E0001) Place_Keyword: OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Mariana Archipelago > Northern Mariana Islands ( CNMI ) (18N146E0000) Place_Keyword: COUNTRY/TERRITORY > Northern Mariana Islands > Northern Mariana Islands > Northern Mariana Islands ( CNMI ) (18N146E0000) Place: Place_Keyword_Thesaurus: None Place_Keyword: Arakane Bank Access_Constraints: None Use_Constraints: Please acknowledge the NOAA Coral Reef Ecosystem Division, Pacific Islands Fisheries Science Center as the source of this information. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), NOAA National Marine Fisheries Service (NMFS) Contact_Address: Address_Type: mailing and physical Address: 1680 East-West Road POST 833 City: Honolulu State_or_Province: HI Postal_Code: 96822 Country: USA Contact_Voice_Telephone: 808-956-5239 Contact_Electronic_Mail_Address: pibhmc@soest.hawaii.edu Contact_Instructions: e-mail preferred Data_Set_Credit: Pacific Islands Benthic Habitat Mapping Center, Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), NOAA Data_Quality_Information: Logical_Consistency_Report: Unspecified Completeness_Report: Complete Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The horizontal position accuracy for the camera sled position is estimated at plus or minus 100 meters. There are three primary sources of this error. The ship's positioning is based on GPS SPS, often called standalone or non-differential GPS positioning. SPS has a measured accuracy of under 5 meters. The position of the GPS antenna is used; no attempt is made to translocate this position to that of the tow block from which the camera is deployed. The difference between the tow block and the antenna is about 14 meters. The largest source of error is uncertainty associated with the sled's position relative to the tow block. Lineage: Process_Step: Process_Description: After a tow was completed the video tape data and still photographs were reviewed by spot-checking to verify that data were recorded. Navigation data were copied from the acquisition computer to the data archive. A metadata extractor (gloMeta.py, version 9/28/04) was run to summarize the navigation data and test for errors. If errors were detected they were corrected or flagged as appropriate and a new data file was made. This file's header was updated to document what type of processing occurred. A metadata file was recorded in the data archive in the same location as the navigation data. Processed navigation data were then read into ArcView 3.2 shapefiles using an Avenue script named `toadimport.playback.ave', version 9/25/01, written by Ronald Hoeke. Process_Date: 20051017 Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), NOAA National Marine Fisheries Service (NMFS) Contact_Address: Address_Type: mailing and physical Address: 1680 East-West Road POST 833 City: Honolulu State_or_Province: HI Postal_Code: 96822 Country: USA Contact_Voice_Telephone: 808-956-5239 Contact_Electronic_Mail_Address: pibhmc@soest.hawaii.edu Contact_Instructions: e-mail preferred Resource_Description: Digital video imagery that is geo-referenced to navigation files. Distribution_Liability: 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. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ASCII Format_Information_Content: Navigation information are recorded as successive lines in a comma-delimited ASCII text file, with a .glo extension. Each line of a GLO file includes the following data: the year, day of year, time, latitude, longitude, water column depth, vehicle depth, layback, and wing angle. The field for wing angle does not contain useful data. A total of 4 navigation files were collected, including: ara03000a.glo ara03001a.glo ara03002.glo ara03003.glo Digital_Transfer_Option: Offline_Option: Offline_Media: CD-ROM Recording_Format: ISO 9660 Digital_Form: Digital_Transfer_Information: Format_Name: mini digital video cassette Format_Information_Content: These data were recorded on 1 video tape, which includes 50 min of video data covering 1.3 linear km of seabed. List of video tapes: ARA03000-003, Mini DV, Master ARA03000-003, Mini Dv, Backup Digital_Transfer_Option: Offline_Option: Offline_Media: Video cassette tape Recording_Format: mini DV Fees: None Metadata_Reference_Information: Metadata_Date: 20060606 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), NOAA National Marine Fisheries Service (NMFS) Contact_Address: Address_Type: mailing and physical Address: 1680 East-West Road POST 833 City: Honolulu State_or_Province: HI Postal_Code: 96822 Country: USA Contact_Voice_Telephone: 808-956-5239 Contact_Electronic_Mail_Address: pibhmc@soest.hawaii.edu Contact_Instructions: e-mail preferred Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: Local Time Metadata_Access_Constraints: None Metadata_Use_Constraints: None CoRIS: CoRIS_ID: 20060531041214 CoRIS_Children: None CoRIS_Beginning_Date: 20030915 CoRIS_Ending_Date: 20030915 CoRIS_Metadata_Link: http://www.coris.noaa.gov/metadata/records/txt/cred_toad_arakane_2003.txt CoRIS_Tracking_ID: 1336