CRED Optical Validation Data at Midway Island, 2003, to Support Benthic Habitat Mapping

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator:
Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
Publication_Date: 200606
Title:
CRED Optical Validation Data at Midway Island, 2003, to Support Benthic Habitat Mapping
Geospatial_Data_Presentation_Form:
Video and photo 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 at the Northwestern Hawaiian Islands, Midway Island to support Benthic Habitat Mapping efforts.
Purpose:
This data provides optical observations that will be correlated with bathymetry and acoustic backscatter imagery to develop a benthic habitat map of Midway Island. Refer to supplemental information for description of instrument and survey.
Supplemental_Information:
The Midway Islands, located at 28.2 N, 177.4W, are enclosed in the classically shaped Midway Atoll. Within the reef are three islands; Sand Island and Eastern Island were extensively modified during the U.S. Navy's occupation of the atoll. The atoll and banks include 223 sq. km of area with depths less than 100 m. The area is now the Midway Atoll National Wildlife Refuge which is under jurisdiction of the U.S. Fish and Wildlife Service.

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 IRC NMFS/PIFSC/CRED 1845 WASP Blvd., Building 176 Honolulu, HI 96818

Data Files: Video data were recorded on two video tape recorders. The position of the camera sled was recorded using Guildline MiniBat In-Tow data acquisition software.

File naming convention: Each tow is given a name consisting of a 3-letter designator for the island area, "MID" in this case followed by a five-digit tow number. The first two digits indicate the last two digits of the calendar year, i.e., "03" is used for this cruise, which took place in 2003. The last three numbers indicate the consecutive number of the tow for that island and year, and start on the next hundred for subsequent cruises in that year to the same island. During OES0306 the consecutive numbers started at 000. Video tape labels, the navigation files (*.glo) and paper log forms are all annotated with the tow name. 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, "MID03000.glo.met"

Time Correlation: All times are based on UTC. Two clocks were set manually synchronized prior to starting data collection; the clock in the video character generator that was used to annotate the video tape and the TOAD data acquisition computer clock was used to annotate the navigation (*.glo) files. These clocks were set to UTC at the beginning of each evening's operations and then compared to one another prior to (and during) each tow.

Resource Description: Digital video images geo-referenced to navigation files

Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20030807
Ending_Date: 20030808
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -177.44478
East_Bounding_Coordinate: -177.27360
North_Bounding_Coordinate: 28.29900
South_Bounding_Coordinate: 28.18680
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: None
Theme_Keyword: Tethered Optical Assessment Device (TOAD)
Theme_Keyword: Underwater video
Theme_Keyword: OES0306
Theme:
Theme_Keyword_Thesaurus: CoRIS Discovery Thesaurus
Theme_Keyword: Visual Images > Habitats
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: environment
Theme_Keyword: biota
Place:
Place_Keyword_Thesaurus: CoRIS Place Thesaurus
Place_Keyword:
OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Northwestern Hawaiian Islands > Midway Atoll (28N177W0001)
Place_Keyword:
COUNTRY/TERRITORY > United States of America > Hawaii > Honolulu > Midway Atoll (28N177W0001)
Place_Keyword:
OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Northwestern Hawaiian Islands (28N178W0000)
Place_Keyword:
COUNTRY/TERRITORY > United States of America > Hawaii > Honolulu > Northwestern Hawaiian Islands (28N178W0000)
Place:
Place_Keyword_Thesaurus: CoRIS Region
Place_Keyword: NWHI
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), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
Contact_Person: John Rooney
Contact_Address:
Address_Type: mailing and physical address
Address: NOAA IRC
Address: NMFS/PIFSC/CRED
Address: 1845 WASP Blvd., Building 176
City: Honolulu
State_or_Province: HI
Postal_Code: 96818
Contact_Voice_Telephone: 808 725-5360
Contact_Facsimile_Telephone: 808 725-5429
Contact_Electronic_Mail_Address: nmfs.pic.credinfo@noaa.gov
Contact_Instructions: e-mail preferred
Browse_Graphic:
Browse_Graphic_File_Name:
<http://data.nodc.noaa.gov/coris/data/NOAA/nmfs/pifsc/cred/TOADbrowse/TOAD_MID_92dpi.jpg>
Browse_Graphic_File_Description: Midway Atoll, NWHI: TOAD Tows and Multibeam Bathymetry
Browse_Graphic_File_Type: JPEG
Data_Set_Credit:
Benthic Habitat Mapping Group, Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Oceanic and Atmospheric Administration (NOAA)
Security_Information:
Security_Classification_System: Not applicable
Security_Classification: Unclassified
Security_Handling_Description: Not applicable

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 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 camera sled position is based a layback calculation that use ship's course, the amount of cable out and the camera sled depth to develop an estimate of the camera sled position. The amount of cable deployed is manually entered by the operator during a given camera tow.
Lineage:
Process_Step:
Process_Description:
After a tow was completed the video tape data was reviewed by spot checking the master and backup tape to verify that data were recorded. Navigation data were copied from the acquisition computer to the data archive. A metadata extractor (gloFilter.py, version 3/06) 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 ArcView Avenue script named "TOAD.Import.Playback", version 9/25/01, written by Ronald Hoeke.
Process_Date: 20060318

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.0001
Longitude_Resolution: 0.0001
Geographic_Coordinate_Units: Decimal Degrees
Geodetic_Model:
Horizontal_Datum_Name: D_WGS_1984
Ellipsoid_Name: WGS_1984
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257224
Vertical_Coordinate_System_Definition:
Depth_System_Definition:
Depth_Datum_Name: No correction
Depth_Resolution: 0.1
Depth_Distance_Units: meters
Depth_Encoding_Method: Attribute Values

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), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
Contact_Person: John Rooney
Contact_Address:
Address_Type: mailing and physical address
Address: NOAA IRC
Address: NMFS/PIFSC/CRED
Address: 1845 WASP Blvd., Building 176
City: Honolulu
State_or_Province: HI
Postal_Code: 96818
Contact_Voice_Telephone: 808 725-5360
Contact_Facsimile_Telephone: 808 725-5429
Contact_Electronic_Mail_Address: nmfs.pic.credinfo@noaa.gov
Contact_Instructions: e-mail preferred
Resource_Description: Offline Data
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:
Each comma-delimited record contains year, day of year, time, latitude longitude, velocity north and east, water column depth, vehicle depth, layback, and wing angle. For this data set the fields for vehicle depth and wing angle do not contain useful data. List of navigation files: MID03000.glo MID03001.glo MID03002.glo MID03003.glo MID03004.glo MID03009.glo MID03010.glo
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CD-ROM
Recording_Format: ISO 9660
Digital_Form:
Digital_Transfer_Information:
Format_Name: mini digital video and VHS
Format_Information_Content:
List of video tapes: MID03000-001, VHS, Master MID03002-004, VHS, Master MID03009-010, VHS, Master MID03000-001a, Mini DV, Master MID03001b, Mini DV, Master MID03002-003a, Mini DV, Master MID03003b-004, Mini DV, Master MID03009-010a, Mini DV, Master MID03010b, Mini DV, Master MID03000-001a, Mini DV, Backup MID03001b, Mini DV, Backup MID03002-003a, Mini DV, Backup MID03003b-004, Mini DV, Backup MID03009-010a, Mini DV, Backup MID03010b, Mini DV, Backup
Digital_Transfer_Option:
Offline_Option:
Offline_Media: Video cassette tape
Recording_Format: Mini DV
Digital_Form:
Digital_Transfer_Information:
Format_Name: JPG digital still photo
Format_Information_Content:
66 still images available; poor photos were enhanced or deleted List of photo folders: MID03000: MID_080703_0531 (10 photos) MID03001: MID_080703_0651 (8 photos) MID03002: MID_080703_0754 (29 photos) MID03009: MID_080803_0841 (19 photos)
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CD-ROM
Recording_Format: JPEG
Fees: None

Metadata_Reference_Information:
Metadata_Date: 20140312
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), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
Contact_Person: CRED Data Management Team
Contact_Address:
Address_Type: mailing and physical address
Address: NOAA IRC
Address: NMFS/PIFSC/CRED
Address: 1845 WASP Blvd., Building 176
City: Honolulu
State_or_Province: HI
Postal_Code: 96818
Contact_Voice_Telephone: 808 725-5360
Contact_Facsimile_Telephone: 808 725-5429
Contact_Electronic_Mail_Address: nmfs.pic.credinfo@noaa.gov
Contact_Instructions: e-mail preferred
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

CoRIS:
CoRIS_ID: 20080502055735
CoRIS_Children: None
CoRIS_Beginning_Date: 20030807
CoRIS_Ending_Date: 20030808
CoRIS_Metadata_Link:
<http://www.coris.noaa.gov/metadata/records/html/cred_toad_midway_oes0306_2003.html>
CoRIS_Tracking_ID: 1486

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