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)
200509
CRED Optical Validation Data at the island of Tutuila in American Samoa, 2004 to Support Benthic Habitat Mapping
Video imagery, track line navigation files, and log sheets
http://www.soest.hawaii.edu/pibhmc/
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 main Hawaiian Islands,
around the island of Kauai to support Benthic Habitat Mapping efforts during NOAA Ship Oscar Elton Sette cruise
OES0402, from February 19-26, 2002.
These data provide optical observations that will be correlated with bathymetry and acoustic backscatter
imagery to develop a benthic habitat map of Tutuila. Refer to supplemental information for description of
instrument and survey.
Tutuila is the largest of seven islands in American Samoa at 142.3 sq. km. Volcanic in
origin, it reaches a height of 653m at Matafao Peak. Tutuila is centered at 14.30 degrees N, 169.75 degrees W,
has 101.3 km of coastline and an estimated 36.2 sq. km of reef area. The port of Pago Pago is a collapsed crater
and is one of the largest natural ports in the Pacific. Pago Pago contains a tuna cannery which is a hub of a large
purse-seining tuna fishing fleet. The cannery outputs large amounts of nutrients as byproduct into the waters of
Pago Pago harbor. The human population of Tutuila in 1990 was 45,043. It is considered a high island and contributes
significant nutrient and sediment runoff to coastal waters. Tutuila's waters are protected by the 0.7 sq. km
Fagatele Bay National Marine Sanctuary, as well as by the National Park of American Samoa, which covers the
north-central part of the island and approximately 5 sq. km of coastline.
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 1, blue in color) with a
separate load-bearing line to support the sled frame. The electrical cable was clipped to the line at regular
intervals upon deploymentand removed upon recovery. The load-bearing line was led to the starboard capstan on the
aft deck. All TOAD surface components were located in the Dry Lab in an equipment rack on the after bulkhead.
Name & address of person collecting data:
Joyce Miller
NOAA IRC
NMFS/PIFSC/CRED
1845 WASP Blvd., Building 176
Honolulu, HI 96818
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 tow number, which
increments by one for each new tow around that island. During
OES0402 (NOAA Ship Oscar Elton Sette's 2nd cruise in calendar year
2004) the consecutive numbers started at 100. For following
cruises, the tow numbers will increment by 100, so the first tow on
the next cruise to Tutuila will be tow number 200. Video tape labels,
the navigation files (*.glo) and paper log forms are annotated with
the tow name and number, e.g., tut04012. If the navigation file is
edited during processing the file name has a suffix 'a' added. For
example, for a navigation data file named tut04012a.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,
tut04012a.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.
Resource Description: Digital video imagery that is geo-referenced to navigation
files.
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ground condition
None planned
-170.92
-170.49
-14.20
-14.38
NCEI Geoportal FilterCoRIS_MetadataCRCP ProjectBenthic Habitat Mapping and Characterization - American Samoa and PRIA1084
CoRIS Theme Thesaurus
EARTH SCIENCE > Biosphere > Aquatic Habitat > Benthic Habitat
EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Photographic Analysis > Videography
EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Mapping
None
Tethered Optical Assessment Device (TOAD)
Underwater video
OES0402
CoRIS Discovery Thesaurus
Visual Images > Habitats
ISO 19115 Topic Category
environment
biota
CoRIS Place Thesaurus
OCEAN BASIN > Pacific Ocean > American Samoa > Tutuila Island (14S170W0016)
COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Tutuila Island (14S170W0016)
CoRIS Region
AmSam
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
Pacific Island Benthic Habitat Mapping Center, Coral Reef Ecosystem Division (CRED), Pacific Islands
Fisheries Science Center (PIFSC), NOAA
Not applicable
Unclassified
Not applicable
Unspecified
Complete
The horizontal position accuracy for the camera sled position is estimated at
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.
After a tow was completed the video tape data was reviewed by spot-
checking the master to verify that data were recorded. A backup copy of the
tape is made at that time as well. 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 ArcView Avenue
script named `TOAD.Import.Playback', version 9/25/01, written by Ronald
Hoeke.
20040226
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 information on the UTC date
and time, latitude, longitude, velocity north and east of the ship, water
depth of the seafloor below the transducer (to find the total depth
from the water surface to the seafloor add 5 m to these values to
account for the depth of the tranducer) layback, and wing angle.
List of navigation files:
Shapefiles showing camera sled tracks have a three letter location
designator (in this case they are Tut) followed by sequential
numbers starting at 101 and running through 149, except as noted
below. Each shapefile (with a .shp extension) is accompanied by files
of the same name but with .dbf, .shx, and.prj extensions. Only
the shapefiles are listed below, but the accompanying files are both
necessary and do exist in each case.
tut04001.shp tut04031.shp (31 files)
tut04031a.shp (1 file)
tut04032.shp tut04037.shp (6 files)
tut04039.shp tut04049.shp (11 files)
List of glo files:
tut04001-04049.glo
CD-ROM
ISO 9660
mini digital video and VHS
A total of 47 separate segments of video data are available covering
25.6 linear kilometers of seabed.
These data were recorded on 9 video tapes
List of video tapes:
tut04001-006, VHS- Master, Mini DV- Master and Backup
tut04007-012, VHS- Master, Mini DV- Master and Backup
tut04013-017, VHS- Master, Mini DV- Master and Backup
tut04018-019, VHS- Master, Mini DV- Master and Backup
tut04020-026, VHS- Master, Mini DV- Master and Backup
tut04027-030, VHS- Master, Mini DV- Master and Backup
tut04031-036, VHS- Master, Mini DV- Master and Backup
tut04037-044, VHS- Master, Mini DV- Master and Backup
tut04045-049, VHS- Master, Mini DV- Master and Backup
Video cassette tape
mini dv
avi
http://www.soest.hawaii.edu/pibhmc/pibhmc_amsamoa_optical_data.html
None
20200329
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 Standard for Digital Geospatial Metadata
FGDC-STD-001-1998
20080502062534
None
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https://www.coris.noaa.gov/metadata/records/html/cred_toad_tutuila_oes0402_2004.html
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