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)
200704
CRED Optical Validation Data at Lisianski Island, 2001, to Support Benthic Habitat Mapping
Video and photo 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 Northwestern Hawaiian
Islands, Lisianski Island to support Benthic Habitat Mapping efforts.
This data provides optical observations that will be correlated with bathymetry and acoustic backscatter
imagery to develop a benthic habitat map of Lisianski Island. Refer to supplemental information for description of
instrument and survey.
Lisianski Island and adjacent Neva Shoals, located at 26N, 174W, is an open atoll ecosystem.
The underlying basaltic structure is estimated to be 20 million years old. The island is large (1.46 sq. km) and
the coral reef habitats less than 100 m are extensive (979 sq. km).
Optical validation data were collected using the Tethered Optical Assessment Device (TOAD), a sled equipped with
underwater video camera, still camera, and lights. These data are used to provide ground-truth validation that for
benthic habitat maps based on multibeam echosounder surveys. Camera sled deployments were conducted at night,
usually between 1800 and midnight. The TOAD was deployed from a pot hauler mounted on the starboard side of the
fantail on NOAA Ship Townsend Cromwell. It was 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. The TOAD was a
MiniBat 8820 unit manufactured by Guideline, and was towed by the ship at 1-2 knots while remotely guided from the
ship using adjustable wing controls to keep the unit close to the underwater substrate.
Equipment Description: The TOAD is a camera sled based on the Guildline MiniBat model 8820 tow body. The frame was
configured with a single Sony DCR-PC110 Digital Video Camera in a modified Gates underwater housing, a Canon Power
Shot G1 Still Camera (modified by CRED engineers) in an Ikelite housing rated to 60 m slaved to an Ikelite DS-50
strobe, and two 500 W DeepSea Power & Light model 710-0400601 underwater lights. The Canon camera had a custom-built
timer that enabled the user to select a constant time interval (ranging from approximately 5 seconds to 2 minutes)
between photographs. An interval of 30 seconds was typically selected, which, assuming a mean velocity for the
camera sled of 1.5 knots, resulted in one photograph approximately every 20 m. Photograph resolution is 2048 x 1536
pixels and file names are assigned sequentially and automatically by the camera, starting at 100-0000 after the
camera's memory is cleared. The MiniBat pressure sensor and wing controller were also mounted on the frame but the
pressure sensor was not operational. The cable between the sled and the surface was an underwater load-bearing electrical cable. The TOAD
computers were located in the Electronics Lab of the Townsend Cromwell. The electronics box containing the power
switches was secured to the ship's fantail, and all other TOAD surface components were secured in the ship's wet lab.
Name & address of person collecting data:
Joyce Miller & Ronald Hoeke
NOAA IRC
NMFS/PIFSC/CRED
1845 WASP Blvd., Building 176
Honolulu, HI 96818
Data Files: Video data were recorded on two video tape recorders. Still photos were recorded on digital camera and
downloaded to the TOAD computer after the tow. 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 followed
by a tow number. During TC0111 the consecutive numbers started at 0001. 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, "LIS01001.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. There were
problems maintaining synchronization of the TOAD computer clock during this cruise. See the problems section for a
description.
Resource Description: Digital video images that are geo-referenced to navigation files
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20011107
ground condition
As needed
-174.13728
-174.02578
26.10765
25.99753
NCEI Geoportal FilterCoRIS_MetadataCRCP ProjectBenthic Habitat Mapping and Characterization - Northwestern and Main Hawaiian Islands1217
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 Video (TOAD)
Underwater video
TC0111
CoRIS Discovery Thesaurus
Visual Images > Habitats
ISO 19115 Topic Category
environment
007
biota
002
CoRIS Place Thesaurus
OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Northwestern Hawaiian Islands > Lisianski Island (25N173W0001)
COUNTRY/TERRITORY > United States of America > Hawaii > Honolulu > Lisianski Island (25N173W0001)
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)
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
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.
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)
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
Offline 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 dataset the
fields for vehicle depth and wing angle do not contain useful data.
List of navigation files:
LIS01001.glo
LIS01002.glo
LIS01003.glo
CD-ROM
ISO 9660
mini digital video and VHS
List of video tapes:
LIS01001- 002a, VHS, Master
LIS01001- 002a, Mini DV, Master
LIS01002b, VHS, Master
LIS01002b, Mini DV, Master
LIS01003, VHS, Master
LIS01003, Mini DV, Master
LIS01001- 002a, Mini DV, Backup
LIS01002b, Mini DV, Backup
LIS01003, Mini DV, Backup
Video cassette tape
Mini DV
JPG digital still photo
96 still images available; poor photos were enhanced or deleted
List of photo folders:
LIS01001: LIS_102801_0529 (5 photos)
LIS01003: LIS_110701_0106 (91 photos)
CD-ROM
JPEG
None
20200329
20110323
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)
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
20080502022053
None
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https://www.coris.noaa.gov/metadata/records/html/cred_toad_lisianski_tc0111_2001.html
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