CRED Optical Validation Data collected on Galvez Bank, Territory of Guam; and Rota Island, Commonwealth of Northern Mariana Islands, USA, in 2010 to support Benthic Habitat Mapping

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: 20111201
Title:

CRED Optical Validation Data collected on Galvez Bank, Territory of Guam; and Rota Island, Commonwealth of Northern Mariana Islands, USA, in 2010 to support Benthic Habitat Mapping

Geospatial_Data_Presentation_Form: Video 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 SeaBED-class AUV, over Galvez Bank, Territory of Guam; and Rota Island, Commonwealth of Northern Mariana Islands, USA. Data were collected from the NOAA Ship the Oscar Elton Sette during cruise SE1002, which ran from 11 February to 14 March 2010.

Purpose:

These data provides optical observations that have been used to provide information on the distribution of coral communities and associated fish communities between 50 and 150 m depths.

Supplemental_Information:

Galvez Bank is located about 12 nautical miles (22 km) south-southwest of the island of Guam. The bank has a minimum charted depth of 20 m. Most of the bank top is characterized by moderate relief reef, with algae, coral patch reefs and an associated reef fish community. Rota is the southernmost island of the Commonwealth of the Northern Mariana Islands, and lies about 60 km northeast of Guam. From February 14-23 2010, surveys were conducted with the SeaBED AUV from the Oscar Elton Sette. Equipment Description: The SeaBED-class AUV was built by Woods Hole Oceanographic Institution (WHOI), and is designed to autonomously follow the seafloor, collecting high resolution color imagery, while maintaining a forward speed of 0.25-0.5m/s along a pre-programed route. The AUV is twin-hulled, with the top hull containing CPU electronics, and the bottom hull containing batteries, cameras, and sensors. All electronics are connected by wet cabling that is routed through vertical struts. The AUV has a maximum depht range of 2000 m and a maximum single dive time of 6-8 hours. The AUV is mounted with two 5-megapixel Prosilica GigE strobe-lighted cameras, one downward-looking and one forward-looking (~35 deg). An onboard Seabird model 49 FastCat CTD also records temperature and salinity data along the track. During SE1002, the AUV was programed to travel a pre-determined route while maintaining an elevation of 3 m above the seafloor, at a speed of 0.25 m/s, and taking photographs every 5 seconds. Dives were conducted over the same track during daylight and nighttime hours to allow comparison between fish communities day and night. Data Files: Position data are recorded to text files as described below. Photos are recorded to hard drive. File naming convention: Navigation files follow the format of yyyymmdd_utctime.CTL.auv, e.g., 20110921_2200.CTL.auv Time Correlation: All times are based on UTC. Clocks were manually synchronized prior to starting data collection each day of operations.

Resource_Description Digital photographs that is geo-referenced to navigation files.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20100214
Ending_Date: 20111201

Currentness_Reference: ground condition

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: 144.4289
East_Bounding_Coordinate: 145.1826
North_Bounding_Coordinate: 14.1933
South_Bounding_Coordinate: 13.0746

Keywords:

Theme:

Theme_Keyword_Thesaurus: NCEI Geoportal Filter
Theme_Keyword: CoRIS_Metadata

Theme:

Theme_Keyword_Thesaurus: CRCP Project
Theme_Keyword:

Benthic Habitat Mapping and Characterization - Commonwealth of the Northern Mariana Islands and Guam

Theme_Keyword: 1398

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_Keyword:

EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs > Coral Reef Ecology > Hard Coral Cover Live percentage

Theme:

Theme_Keyword_Thesaurus: CoRIS Discovery Thesaurus
Theme_Keyword: Visual Images > Habitats

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: imageryBaseMapsEarthCover
Theme_Keyword: 010

Place:

Place_Keyword_Thesaurus: CoRIS Place Thesaurus
Place_Keyword:

OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > Galvez Bank (13N144E0049)

Place_Keyword:

COUNTRY/TERRITORY > United States of America > Guam > Galvez Bank (13N144E0049)

Place_Keyword:

COUNTRY/TERRITORY > Northern Mariana Islands > Rota > Rota Island ( Luta ) (14N145E0007)

Place_Keyword:

OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Rota Island > Rota Island ( Luta ) (14N145E0007)

Place_Keyword:

OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Mariana Archipelago > Northern Mariana Islands ( CNMI ) (18N146E0000)

Place_Keyword:

COUNTRY/TERRITORY > Northern Mariana Islands > Northern Mariana Islands > Northern Mariana Islands ( CNMI ) (18N146E0000)

Place:

Place_Keyword_Thesaurus: CoRIS Region
Place_Keyword: CNMI
Place_Keyword: Guam

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:

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

Data_Set_Credit:

Benthic Habitat Mapping Group, Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), 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:

Horizontal positional accuracy, based on examination of data, is estimated to be <10 m. Known error is attributable to the USBL and the ship's GPS. Position of the AUV relative to the ship is determined by USBL with an accuracy of 0.2 m. At the beginning of a dive, the AUV's RDI fixes a start location. Throughout the dive, the XY position of the AUV is recorded as an XY coordinate, relative to the start position. The ship's position is recorded throughout the mission, and the track lines are then created by calculating the position of the AUV, relative to it's start position, and to the ship's position. Position error arises from the ship's positioning. 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 referenced to the ship's granite block.

Lineage:

Process_Step:

Process_Description:

Photos are recorded on to the AUV hard drive during each dive, in a raw image format (.pgm). Following each dive, images are downloaded to a LAN hard drive or external hard drive, and then color-corrected using a WHOI-developed python script. Corrected images are then converted to JPEG format. The latitude and longitude for each image is determined by matching the timestamp of the image to the AUV navigation file. A script was developed to select photos taken approximately every 5 meters, and export these, along with position information, into a csv file which could then be imported into the custom-built TOAD Access 2007 database. Coral Point Count with Excel Extensions (CPCe) was used to overlay 10 points on to each photo. The substrate and living benthic cover underneath each point were then classified, with the classified data being entered directly into the TOAD Access database. The benthic habitat was classified using the PIBHMC_tow classification scheme. The classified results were then exported as an excel spreadsheet which summarized the data as percent cover of substrate and different benthic categories for each photo, and imported into ArcGIS v9.3, and then saved as a shapefile. Percent scleractinian coral was colour symbolized in optical validation maps with underlying fields of different substrates contained within the attribute table of the shapefile. For more information on classificiation methods, refer to the PIBHMC website ftp://ftp.soest.hawaii.edu/pibhmc/website/webdocs/documentation/Optical-Proc_Overview.pdf For more information on the classification scheme,refer to the PIBHMC website ftp://ftp.soest.hawaii.edu/pibhmc/website/webdocs/documentation/Benth-Habitat-Class_Codes.htm

Process_Date: 20111201

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

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: ArcGIS shapefile
Format_Information_Content: attribute table.

Digital_Transfer_Option:

Offline_Option:

Offline_Media: CD-ROM
Recording_Format: ISO 9660

Digital_Form:

Digital_Transfer_Information:

Format_Name: JPEG
Format_Information_Content:

689 photographs are available, from 3 tows, covering ~6.5 km of seabed.

Digital_Transfer_Option:

Offline_Option:

Offline_Media: DVD
Recording_Format: Hard disk

Fees: None

CRED Optical Validation Data collected on Galvez Bank, Territory of Guam; and Rota Island, Commonwealth of Northern Mariana Islands, USA, in 2010 to support Benthic Habitat Mapping

Metadata: