CRED Towed-Diver Benthic Characterization Survey at Hawaii, Main Hawaiian Islands in 2010
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Metadata:
- Identification_Information:
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- Citation:
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- Citation_Information:
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- Originator:
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Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
- Publication_Date: 20110218
- Title:
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CRED Towed-Diver Benthic Characterization Survey at Hawaii, Main
Hawaiian Islands in 2010
- Geospatial_Data_Presentation_Form: spreadsheet
- Online_Linkage:
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https://www.fisheries.noaa.gov/pacific-islands/ecosystems/surveying-vast-ocean
- Description:
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- Abstract:
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To support NOAA Coral Reef Conservation Program (CRCP) long-term
goals for sustainable management and conservation of coral reef
ecosystems, towed-diver surveys (aka. towboard surveys) were
conducted by the Coral Reef Ecosystem Division (CRED) of the
NOAA Pacific Islands Fisheries Science Center (PIFSC) as part of
biennial Pacific Reef Assessment and Monitoring Program (RAMP)
Cruises. 37 towboard surveys (80.60 km in length), were
conducted at Hawaii during the Main Hawaiian Islands RAMP Cruise
HA1008 from 20101007 to 20101105. Towboard surveys are a good
method for obtaining a general description of large reef areas,
assessing the status of low-density populations of large-bodied
reef fish, large-scale disturbances (e.g., bleaching), general
distribution and abundance patterns of macro-invertebrates
(e.g., Crown of Thorns sea stars, giant clams), and for
assessing trends in these populations and metrics. A pair of
scuba divers (1 fish and 1 benthic diver) are towed 60 m behind
a small survey launch at a speed of 1-2 knots and a depth of
approximately 15 m. Each survey is 50 min long, covers about 2
km of habitat, and is divided into ten 5-minute survey segments.
The fish diver records, to the lowest possible taxon, all
large-bodied reef fishes (greater than 50 cm total length) seen
within 5 m either side and 10 m in front of the towboard. Length
of each individual is estimated to the nearest cm. The fish
towboard is also outfitted with a forward-facing digital video
camera to record the survey swath. The benthic diver records
percent cover of coral and macroalgae, estimates benthic habitat
type and complexity, and censuses a suite of benthic
macroinvertebrates including Crown of Thorns sea stars and sea
urchins. The benthic towboard is equipped with a downward-facing
digital still camera which images the benthos at 15-second
intervals. These images are analyzed for percent cover of coral,
algae, and other benthic components. Both towboards are equipped
with SEABIRD SBE-39 temperature/depth sensors set to record at
5-second intervals. Latitude and longitude of each survey track
is recorded at 5-second intervals using a Global Positioning
System (GPS) receiver onboard the tow boat. A layback algorithm
is applied to more accurately map the position of the divers
with respect to the reef environment. This algorithm calculates
the position of the divers based on the position of the tow boat
taking into account the length of the tow rope, the depth of the
divers, and the curvature of the survey track. This metadata
applies to the benthic characterization observations.
- Purpose:
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Part of a long-term monitoring program at biennial intervals
which documents the state of the reefs.
- Supplemental_Information:
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The benthic characterization observation data includes benthic
composition, complexity estimations, observed
macro-invertebrates, and observed man-made objects.
Classification of habitat complexity was recorded in six
categories: low (L), medium-low (ML), medium (M), medium-high
(MH), high (H), and very high (VH). Benthic cover was estimated
for four different types of substrate: hard substrate/pavement,
sand, rubble, and live hard (scleractinian) coral. The time of
the benthic digital photos were set to the GMT time. There are
approximately 200 pictures for each 50-minute towed survey
track. The resolution at "Draft" quality (the lowest) is 72
pixels/inch. The resolution at "Best" quality (the highest) is
266 pixels/inch. The naming convention of benthic photos is
***MMDDYY_X_###.JPG, where *** is 3-letter abbreviation of the
island or bank surveyed, MMDDYY is the local date of the
towboard survey, X is the Xth dive on the day, and ### is the
sequence number of the pictures taken for that particular dive.
As an example, JAR032106_3_108.JPG means the picture was the
108th picture taken on 3rd dive of March 21, 2006 at Jarvis
Island.
- Time_Period_of_Content:
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- Time_Period_Information:
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- Range_of_Dates/Times:
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- Beginning_Date: 20101008
- Ending_Date: 20101014
- Currentness_Reference: Ground Condition
- Status:
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- Progress: Complete
- Maintenance_and_Update_Frequency: asNeeded
- Spatial_Domain:
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- Bounding_Coordinates:
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- West_Bounding_Coordinate: -155.91979803
- East_Bounding_Coordinate: -154.83890703
- North_Bounding_Coordinate: 20.27140171
- South_Bounding_Coordinate: 18.93066935
- Keywords:
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- Theme:
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- Theme_Keyword_Thesaurus: NCEI Geoportal Filter
- Theme_Keyword: CoRIS_Metadata
- Theme:
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- Theme_Keyword_Thesaurus: CRCP Project
- Theme_Keyword:
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Pacific Reef Assessment and Monitoring Program (Pacific RAMP): Biennial monitoring for the U.S. Pacific Islands and Atolls
- Theme_Keyword: 1221
- Theme:
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- Theme_Keyword_Thesaurus: None
- Theme_Keyword: Marine Ecosystem
- Theme_Keyword: Reef Assessment and Monitoring Program (RAMP)
- Theme_Keyword: Towed Diver Surveys
- Theme_Keyword: Coral Reef
- Theme_Keyword: Benthic Habitat
- Theme_Keyword: Main Hawaiian Islands
- Theme_Keyword: Hawaii
- Theme_Keyword: HA1008
- Theme:
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- Theme_Keyword_Thesaurus: CoRIS Discovery Thesaurus
- Theme_Keyword: Numeric Data Sets > Biology
- Theme:
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- Theme_Keyword_Thesaurus: CoRIS Theme Thesaurus
- Theme_Keyword: EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs
- Theme_Keyword:
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EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs > Coral reef ecology
- Theme_Keyword:
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EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs > Coral reef ecology > Habitats
- Theme_Keyword:
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EARTH SCIENCE > Biosphere > Zoology > Corals > Reef monitoring and assessment
- Theme_Keyword: EARTH SCIENCE > Biosphere > Aquatic Habitat > Benthic Habitat
- Theme:
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- Theme_Keyword_Thesaurus: ISO 19115 Topic Category
- Theme_Keyword: biota
- Theme_Keyword: 002
- Place:
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- Place_Keyword_Thesaurus: None
- Place_Keyword: Main Hawaiian Islands
- Place_Keyword: Hawaii
- Place:
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- Place_Keyword_Thesaurus: CoRIS Place Thesaurus
- Place_Keyword:
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OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Hawaii Island > Hawaii Island (19N155W0003)
- Place_Keyword:
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COUNTRY/TERRITORY > United States of America > Hawaii > Hawaii > Hawaii Island (19N155W0003)
- Place:
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- Place_Keyword_Thesaurus: CoRIS Region
- Place_Keyword: MHI
- Access_Constraints: None
- Use_Constraints:
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Please cite CRED when using data. Coral Reef Ecosystem Division,
Pacific Islands Fisheries Science Center, National Marine
Fisheries Service, National Oceanic and Atmospheric Administration
- Point_of_Contact:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization:
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Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
- Contact_Address:
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- 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
- Country: USA
- 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
- Data_Set_Credit:
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Jason Helyer, Jeff Anderson, Coral Reef Ecosystem Division (CRED),
Pacific Islands Fisheries Sciences Center, NOAA National Marine
Fisheries Service
- Security_Information:
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- Security_Classification_System: Not applicable
- Security_Classification: Unclassified
- Security_Handling_Description: Not applicable
- Native_Data_Set_Environment: Oracle
- Data_Quality_Information:
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- Attribute_Accuracy:
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- Attribute_Accuracy_Report:
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Observations were made by divers who are expert coral reef
ecologist. Surveying in this habitat will greatly depend on the
current, wave conditions, and field scheduling. The towed-diver
survey is conducted one time per site per survey year; it is not
replicated. Divers may change from year to year and by location.
- Logical_Consistency_Report:
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The same data collection protocols were used at each island or bank
surveyed.
- Completeness_Report:
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The towboard surveys are completed in forereef, backreef, and
lagoon habitats. The minimum spatial resolution of the towboard
survey is the 5-minute survey segment which covers approximately
200 m. As such, these surveys are appropriate for broad estimates
but can not be used for fine scale, site-level data analysis.
- Positional_Accuracy:
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- Horizontal_Positional_Accuracy:
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- Horizontal_Positional_Accuracy_Report:
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Although resource grade GPS units were used and a layback
model was applied to the survey tracks, the exact survey
positions were not physically marked and effort was not made
to re-visit exact same tracks.
- Quantitative_Horizontal_Positional_Accuracy_Assessment:
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- Horizontal_Positional_Accuracy_Value: 1
- Horizontal_Positional_Accuracy_Explanation: Instrument parameters
- Vertical_Positional_Accuracy:
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- Vertical_Positional_Accuracy_Report: SeaBird SBE-39 temp/depth recorder
- Quantitative_Vertical_Positional_Accuracy_Assessment:
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- Vertical_Positional_Accuracy_Value: 0.3
- Vertical_Positional_Accuracy_Explanation: Instrument parameters
- Lineage:
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- Process_Step:
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- Process_Description:
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The towboard survey involves a pair of scuba divers who are
towed 60 m behind a small boat at a constant speed (~1.5
knots). The towboard survey is typically 50-min long and
covers about 2 km of habitat, depending on the depth profile
of the divers. The survey is divided into ten 5-min segments.
During the survey, the fish diver records, to the lowest
possible taxon, large fishes observed within a survey swath 5
m to either side of the diver and 10 m in front the diver.
- Process_Date: Unknown
- Spatial_Reference_Information:
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- Horizontal_Coordinate_System_Definition:
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- Geographic:
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- Latitude_Resolution: 0.0001
- Longitude_Resolution: 0.0001
- Geographic_Coordinate_Units: Decimal Degrees
- Geodetic_Model:
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- Horizontal_Datum_Name: World Geodetic System 1984 (WGS84)
- Ellipsoid_Name: Geodetic Reference System 80 (GRS80)
- Semi-major_Axis: 6378137
- Denominator_of_Flattening_Ratio: 298.2572236
- Vertical_Coordinate_System_Definition:
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- Depth_System_Definition:
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- Depth_Datum_Name: Local surface
- Depth_Resolution: 1
- Depth_Distance_Units: meters
- Depth_Encoding_Method: Explicit Depth Coordinate Included with Horizontal Coordinates
- Distribution_Information:
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- Distributor:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization:
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Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
- Contact_Position: Data Manager
- Contact_Address:
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- 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
- Country: USA
- 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:
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While every effort has been made to ensure that these data are
accurate and reliable within the limits of the current state of
the art, NOAA cannot assume liability for any damages caused by
errors or omissions in the data, nor as a result of the failure of
the data to function on a particular system. NOAA makes no
warranty, expressed or implied, nor does the fact of distribution
constitute such a warranty.
- Standard_Order_Process:
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- Digital_Form:
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- Digital_Transfer_Information:
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- Format_Name:
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xls (Microsoft Excel worksheet) or csv (comma-separated
values)
- Digital_Transfer_Option:
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- Offline_Option:
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- Offline_Media: CD-ROM or email
- Recording_Format: ISO 9660
- Fees: None if receiving the data online
- Custom_Order_Process: Contact CRED data management team for information
- Technical_Prerequisites: Contact CRED data management team for information
- Metadata_Reference_Information:
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- Metadata_Date: 20190605
- Metadata_Review_Date: 20110304
- Metadata_Contact:
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- Contact_Information:
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- Contact_Organization_Primary:
-
- Contact_Organization:
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Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
- 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
- Country: USA
- 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:
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- CoRIS_ID: 20110303101509
- CoRIS_Children: None
- CoRIS_Beginning_Date: 20101008
- CoRIS_Ending_Date: 20101014
- CoRIS_Metadata_Link:
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https://www.coris.noaa.gov/metadata/records/html/hawaiibenthictowmetadata2010.html
- CoRIS_Tracking_ID: 6216
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