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)
200606
CRED Fish Biomass Estimates at Pearl and Hermes Atoll, 2003 to Support Benthic Habitat Mapping
Video and photo imagery, track line navigation files, and log sheets
http://www.soest.hawaii.edu/pibhmc/
http://www.soest.hawaii.edu/pibhmc/pibhmc_nwhi_phr.htm
Fish biomass data were collected using a Towed Optical Assessment Device (TOAD), an underwater
sled equipped with an underwater digital video camera and lights. Data were collected at the Northwestern Hawaiian
Islands, Pearl and Hermes Atoll to support Benthic Habitat Mapping efforts during NOAA Ship Oscar Elton Sette cruise
OES0306.
These data will provide optical observations that will be correlated with bathymetry and acoustic backscatter
imagery to create a fish biomass map of Pearl and Hermes Atoll. Refer to supplemental information for description
of instrument and survey.
Pearl and Hermes Atoll, located at 27.8N, 175.8W, is an extensive atoll area containing
numerous small islets. The coral reef environment includes 1,166 sq. km of banks shallower than 100 m in depth.
Mobile fauna 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 fish count and biomass maps where benthic
habitat classification has been completed. 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 an 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, "PHR"
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 004. 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, "PHR03002.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 that are geo-referenced to navigation files
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ground condition
As needed
-176.01243
-175.99147
27.98013
27.75137
NCEI Geoportal FilterCoRIS_Metadata
CRCP Project
Benthic Habitat Mapping and Characterization - Northwestern and Main Hawaiian Islands
1217
CoRIS Theme Thesaurus
EARTH SCIENCE > Biosphere > Aquatic Habitat > Benthic Habitat
EARTH SCIENCE > Biosphere > Zoology > Corals > Reef monitoring and assessment > Mapping
EARTH SCIENCE > Biosphere > Zoology > Corals > Reef monitoring and assessment > Photographic analysis > Videography
EARTH SCIENCE > Oceans > Marine Biology > Fish
None
Tethered Optical Assessment Device (TOAD)
Underwater video
OES0306
CoRIS Discovery Thesaurus
Geographic Information > Fish Stock Characteristics
ISO 19115 Topic Category
environment
007
biota
002
CoRIS Place Thesaurus
OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Northwestern Hawaiian Islands > Pearl and Hermes Reef (27N176W0001)
COUNTRY/TERRITORY > United States of America > Hawaii > Honolulu > Pearl and Hermes Reef (27N176W0001)
None
Northwestern Hawaiian Islands
CoRIS Region
NWHI
None
Please acknowledge the NOAA Coral Reef Ecosystem Division, Pacific Islands Fisheries Science Center
as the source of this information.
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)
John Rooney
mailing and physical address
NOAA IRC
NMFS/PIFSC/CRED
1845 WASP Blvd., Building 176
Honolulu
HI
96818
808 725-5360
808 725-5429
nmfs.pic.credinfo@noaa.gov
e-mail preferred
https://www.ncei.noaa.gov/data/oceans/coris/data/NOAA/nmfs/pifsc/cred/TOADbrowse/TOAD_PHA_92dpi.jpg
Pearl and Hermes Atoll, NWHI: TOAD Tows and Multibeam Bathymetry
JPEG
Benthic Habitat Mapping Group, Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science
Center (PIFSC), National Oceanic and Atmospheric Administration (NOAA)
Not applicable
Unclassified
Not applicable
Unspecified
Complete
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.
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.TOAD video were classified for benthic habitat type to create Optical Validation maps to interpret
acoustically derived data layers. These classified points were imported into a Microsoft Access 2003 database. All
fish present during 15 second intervals before and after these positions were recorded and identified. Using LW
coefficients derived from fishbase.org and size estimates from video, total biomass was calculated for a given point.
An area of 0.0012 hectares per point observation was assumed based on average distances traveled between points as well
as average width of field of view. A table with position, island, biomass (tones/hectare), and number of fish was exported
from MS Access into ArcGIS v9.2. This file was exported as a shapefile. Column with biomass data was symbolized using
layer file MF_Biomass.lyr to create Fish Biomass Estimates map.
20060318
0.0001
0.0001
Decimal Degrees
D_WGS_1984
WGS_1984
6378137.000000
298.257224
No correction
0.1
meters
Attribute Values
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)
John Rooney
mailing and physical address
NOAA IRC
NMFS/PIFSC/CRED
1845 WASP Blvd., Building 176
Honolulu
HI
96818
808 725-5360
808 725-5429
nmfs.pic.credinfo@noaa.gov
e-mail preferred
Downloadable Data
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.
ASCII
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:
PHR03002.glo
PHR03003.glo
PHR03004.glo
PHR03005.glo
PHR03006a.glo
PHR03008.glo
PHR03009.glo
PHR03010.glo
PHR03011.glo
PHR03012.glo
PHR03016.glo
PHR03017a.glo
PHR03018a.glo
PHR03019.glo
PHR03020a.glo
PHR03021a.glo
PHR03022a.glo
PHR03023.glo
PHR03024.glo
CD-ROM
ISO 9660
mini digital video
List of video tapes:
PHR03002-003, VHS, Master
PHR03004, VHS, Master
PHR03005-006, VHS, Master
PHR03008-010, VHS, Master
PHR03011-012, VHS, Master
PHR03016-018, VHS, Master
PHR03019, VHS, Master
PHR03021-022, VHS, Master
PHR03023-024, VHS, Master
PHR03002-003, Mini DV, Master
PHR03004, Mini DV, Master
PHR03005-006a, Mini DV, Master
PHR03006b, Mini DV, Master
PHR03008-010a, Mini DV, Master
PHR03008-010b, Mini DV, Master
PHR03011-012, Mini DV, Master
PHR03016-018, Mini DV, Master
PHR03019, Mini DV, Master
PHR03021-022, Mini DV, Master
PHR03023-024a, Mini DV, Master
PHR03024b, Mini DV, Master
PHR03002-003, Mini DV, Backup
PHR03004, Mini DV, Backup
PHR03005-006a, Mini DV, Backup
PHR03006b, Mini DV, Backup
PHR03008-010a, Mini DV, Backup
PHR03008-010b, Mini DV, Backup
PHR03011-012, Mini DV, Backup
PHR03016-018, Mini DV, Backup
PHR03019, Mini DV, Backup
PHR03021-022, Mini DV, Backup
PHR03023-024a, Mini DV, Backup
PHR03024b, Mini DV, Backup
Video cassette tape
Mini DV
JPG digital still photo
245 still images available; poor photos were enhanced or deleted
List of photo folders:
PHR03006: PHR_073003_1717 (49 photos)
PHR03010: PHR_073103_0803 (47 photos)
PHR03011: PHR_073103_0852 (95 photos)
PHR03018: PHR_080103_0809 (54 photos)
CD-ROM
JPEG
None
20200329
20081222
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)
CRED Data Management Team
mailing and physical address
NOAA IRC
NMFS/PIFSC/CRED
1845 WASP Blvd., Building 176
Honolulu
HI
96818
808 725-5360
808 725-5429
nmfs.pic.credinfo@noaa.gov
e-mail preferred
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
Local Time
None
None
20081222035324
None
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https://www.coris.noaa.gov/metadata/records/html/cred_toad_pearl_hermes_oes0306_2003_mobilefauna.html
2479