2002 EM1002 and EM120 Multibeam Sonar Data from Cruise R/V Kilo Moana KM-02-06 - Northwestern Hawaiian Islands

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Frequently anticipated questions:


What does this data set describe?

Title:
2002 EM1002 and EM120 Multibeam Sonar Data from Cruise R/V Kilo Moana KM-02-06 - Northwestern Hawaiian Islands
Abstract:
EM1002 and EM120 multibeam Data were collected in October/November 2002 aboard R/V Kilo Moana between Kauai Island and Lisianski Island in the Northwestern Hawaiian Islands (NWHI). Multibeam data were collected using Simrad Neptune software, converted to the Generic Sensor Format, and processed using SABER editing software. Sound velocity corrections from CTD's and motion corrections from a POS-MV vertical reference were applied to the data in real time. No tidal correctors were applied in real-time or in post-processing. The EM1002 has heave artifacts (~0.6m) in shallow bank-top data.

Horizontal accuracy is 20m (no differential GPS correctors applied), vertical accuracy is depth dependent (~1% of water depth), WGS84 datum. These data are not to be used for navigation. Depths mapped range from 30-5200 meters below sea level.

Supplemental_Information:
Data were collected aboard the R/V Kilo Moana, a 57 m (186') oceanographic research vessel operated by the University of Hawaii, School of Ocean and Earth Science and Technology undera a charter agreement with the Office of Naval Research. The R/V Kilo Moana survey sensors include a 12 kHz Simrad EM120 sonar and a 95 kHz Simrad EM1002 sonar, used to acquire bathymetry and acoustic backscatter imager, a TSS/Applanix POS/MV Model 320, which measures time, position, velocity, attitude and heading, and expendable bathymetry thermographs (XBT) to acquire sound velocity profiles.

For more information on R/V Kilo Moana's survey equipment see the University of Hawaii Marine Center's website: www.soest.hawaii.edu/UMC.

For more information on R/V Kilo Moana cruise KM-02-06 see the cruise report: ftp.soest.hawaii.edu/pibhmc/website/cruisecatalog/KM0206_cruise_report_draft.pdf.

Resource Description: EM1002 and EM120 Multibeam Sonar Data from KM-02-06

  1. How should 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), 200612, 2002 EM1002 and EM120 Multibeam Sonar Data from Cruise R/V Kilo Moana KM-02-06 - Northwestern Hawaiian Islands.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -174.70
    East_Bounding_Coordinate: -158.00
    North_Bounding_Coordinate: 26.66
    South_Bounding_Coordinate: 21.00

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 22-Oct-2002
    Ending_Date: 16-Nov-2002
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: Generic Sensor Format (GSF) digital data

  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?

    Joyce E. Miller, NOAA PIFSC Coral Reef Ecosystem Division and Dr. Bruce Appelgate and Paul Johnson, Hawaii Mapping Research Group, University of Hawaii

  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)
    NOAA IRC
    Honolulu, HI 96818

    808 725-5360 (voice)
    808 725-5429 (FAX)
    nmfs.pic.credinfo@noaa.gov

    Contact_Instructions: e-mail preferred


Why was the data set created?

The data were collected to provide information on the 25, 50, and 100 fm contours in the NWHI, which are important for establishing management boundaries for the NWHI Coral Reef Ecosystem Reserve. The data are being used to provide bathymetric and backscatter data for previously unmapped areas. The data support ecosystem management requirements for benthic habitat mapping and location of Essential Fish Habitat. The data are also used to study the geologic features of the area.


How was the data set created?

  1. From what previous works were the data drawn?

    Simrad EM 120 (source 1 of 2)
    Miller, Joyce E. , 200612, Simrad EM120 multibeam bathymetric data.

    Type_of_Source_Media: Digital data
    Source_Contribution:
    Simrad EM 120 (12 kHz) bathymetry and imagery data were collected in depths of ~100m and greater. The EM 120 system was placed in stand-by mode in shallower water due to high noise levels.

    Simrad EM1002 (source 2 of 2)
    Miller, Joyce E. , 200612, Simrad EM1002 Bathymetric Data.

    Type_of_Source_Media: Digital data
    Source_Contribution:
    Simrad EM 1002 (95 kHz) bathymetry and imagery data were collected in depths of ~20-1000m. The EM 1002 system was placed in stand-by mode in water depths greater than ~500 m. EM1002 bathymetric data have ~0.6 m heave artifacts 0n shallow bank-tops.

  2. How were the data generated, processed, and modified?

    Date: Unknown (process 1 of 1)
    None

  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?

    Horizontal accuracy is ~20 m as data were collected using GPS with no differential corrections. Vertical accuracy of multibeam data is estimated at 1% of water depth; no tidal corrections were applied.

  2. How accurate are the geographic locations?

    Variable

  3. How accurate are the heights or depths?

    Variable

  4. Where are the gaps in the data? What is missing?

    Varies

  5. How consistent are the relationships among the observations, including topology?

    These data are believed to be logically consisten though no tests were performed


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: These data are NOT TO BE USED FOR NAVIGATION

  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)
    NOAA IRC
    Honolulu, HI 96818

    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?

    Downloadable 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?

  5. Is there some other way to get the data?

    Please contact the Distributor (see above) for distribution options

    These data are also archived through NOAA's National Geophysical Data Center at <http://www.ngdc.noaa.gov/mgg/bathymetry/multibeam.html>

    Data Format - Generic Sensor Format, as described in <http://www.ldeo.columbia.edu/res/pi/MB-System/formatdoc/gsf_spec.pdf>


Who wrote the metadata?

Dates:
Last modified: 12-Mar-2014
Last Reviewed: 26-May-2009
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)
NOAA IRC
Honolulu, HI 96818

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)


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