CRED Optical Validation Data in the Auau Channel, Hawaii, 2007, to Support Benthic Habitat Mapping

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Frequently anticipated questions:

What does this data set describe?

Title:
CRED Optical Validation Data in the Auau Channel, Hawaii, 2007, to Support Benthic Habitat Mapping
Abstract:
Optical validation data were collected using a RCV-150 remotely operated vehicle (ROV) operated by the Hawaii Undersea Research Laboratory (HURL). Data were collected in the Auau Channel, Main Hawaiian Islands, to support benthic habitat mapping efforts during the HURL Ship R/V Ka'imikai-o-Kanaloa cruise in December 2007.
Supplemental_Information:
The waters of the Auau Channel, located between and protected by the islands of Maui, Lanai, Molokai and Kahoolawe to the east, west, north, and south respectively, are bounded by the latitudes 20.983 and 20.733 and the longitudes -156.633 and -156.858. Topography of the channel consists of solution basins and rims (ridges), sediment plains and reef pinnacles on the channel floor, which were subaerially exposed during late Quaternary lowstands of sea level. Holocene reef growth occurs as a thin veneer on topographic highs in the Channel. The Channel reaches depths of 140 m, however, the majority of the seafloor is between 55 m and 100 m deep. The Auau Channel has been documented to include abundant coral reefs at these depths, which, along with algae and other organisms found there,collectively form mesophotic coral ecosystems. Optical validation data were collected using HURL's RCV-150 remotely operated vehicle (ROV), deployed during nighttime hours usually between 1900 and 2300 (Hawaii time). The duration of each dive varied ranging from 53 m to 3 h 36 m, averaging about 1 h 50 minutes. Equipment description: The RCV-150 system consists of a remotely operated vehicle with a color analog video camera, two parallel lasers for scale, and six 250 W lamps. This was deployed from the HURL ship, R/V Ka'imikai-o-Kanaloa. A heavy cage was deployed off the ship's J-frame to whic the ROV was tethered, using a dedicated winch. The ROV operators maintain the ROV, or at least the glow from its lights, within sight of a downward-looking video camera on the cage. This keeps the horizontal distance between the ROV and the cage within 15 m for most deployments. Lighting mounted on the base of the cage provided additional illumination to the ROV. 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 onto digital video media and transcribed on to DVD.
  1. How might this data set be cited?
    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), 20100801, CRED Optical Validation Data in the Auau Channel, Hawaii, 2007, to Support Benthic Habitat Mapping.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -156.8243
    East_Bounding_Coordinate: -156.6797
    North_Bounding_Coordinate: 20.9371
    South_Bounding_Coordinate: 20.7766
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 07-Dec-2007
    Ending_Date: 09-Dec-2007Currentness_Reference: ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Video imagery, track line navigation files, and log sheets
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
    2. What coordinate system is used to represent geographic features?
  7. How does the data set describe geographic features?

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
  2. Who also contributed to the data set?
    Pacific Island Benthic Habitat Mapping Center, Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), NOAA
  3. To whom should users address questions about the data?
    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)
    Attn: John Rooney
    NOAA IRC
    Honolulu, HI

    808 725-5360 (voice)
    808 725-5429 (FAX)
    nmfs.pic.credinfo@noaa.gov
    Contact_Instructions: e-mail preferred

Why was the data set created?

These data provide optical observations that will be used to provide information on the location and distribution of mesophotic coral ecosystem communities between approximately 40 and 150 m depths. Refer to supplemental information for description of instrument and survey.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 29-May-2008 (process 1 of 1)
    Following the cruise, the waypoints providing the ship's position that were recorded during the tow were entered into an Excel spreadsheet and imported into ArcGIS v 9.3. Waypoints provided positions for the ship approximately every 2-10 minutes. To obtain the approximate position of the ship between these points, an Excel macro was run which interpolated the track between these positions, assuming a constant speed of travel, providing approximate position for the ship at 30-second intervals. These positions were then re-imported into ArcGIS v 9.3 to display the interpolated track of the ship, and saved as shapefiles. These positions are used as the best indication of the position of the ROV during the tow, bearing in mind the limitations of the horizontal positional accuracy described above. Spreadsheets containing location and time data were then used to classify benthic habitat for each tow using the Pacific Coral Reef Ecosystem Benthic Habitat Mapping classification scheme. Five points were classified at 30 second intervals and codes were inputted into the spreadsheet. The spreadsheet was saved as dbase file, imported into ArcGIS v9.3, and saved as a shapefile. Percent cover of scleractinian coral was displayed in Optical Validation maps with classifications of other types of living cover and substrates contained within the attribute table of the shapefile.
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
    The horizontal positional accuracy for the ROV at each waypoint is estimated at plus or minus 30 meters. There are two primary sources of this error. The ship's positioning is based on non-differential GPS positioning, which has an accuracy of under 5 meters. The second and and larger source of error is the uncertainty associated with the ROV's position relative to the ship's antenna. This includes the offset of the cage from which the ROV is deployed, relative to the ship's antenna (approximately 10 m) and the distance the ROV may be from the cage (usually < 15 m).
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Complete
  5. How consistent are the relationships among the observations, including topology?
    Unspecified

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None
Use_Constraints:
Please acknowledge the NOAA Coral Reef Ecosystem Division, Pacific Islands Fisheries Science Center as the source of this information.
  1. Who distributes the data set? (Distributor 1 of 1)
    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)
    Attn: John Rooney
    NOAA IRC
    Honolulu, HI

    808 725-5360 (voice)
    808 725-5429 (FAX)
    nmfs.pic.credinfo@noaa.gov
    Contact_Instructions: e-mail preferred
  2. What's the catalog number I need to order this data set? Offline Data
  3. What legal disclaimers am I supposed to read?
    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.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 15-Dec-2024
Last Reviewed: 19-Oct-2010
Metadata author:
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)
Attn: CRED Data Management Team
NOAA IRC
Honolulu, HI

808 725-5360 (voice)
808 725-5429 (FAX)
nmfs.pic.credinfo@noaa.gov
Contact_Instructions: e-mail preferred
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Generated by mp version 2.9.44 on Thu Mar 13 20:52:40 2025