2007 EM300 and EM3002D Multibeam Sonar Data from Cruise Hi'ialakai HI0702 - Commonwealth of the Northern Mariana Islands

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Frequently anticipated questions:


What does this data set describe?

Title:
2007 EM300 and EM3002D Multibeam Sonar Data from Cruise Hi'ialakai HI0702 - Commonwealth of the Northern Mariana Islands
Abstract:
EM300 and EM3002D multibeam Data were collected from May 12-22, 2007, aboard NOAA Ship Hi'ialakai at Santa Rosa Reef, Guam Island, Rota Island, Aguijan Island, Tinian Island, and Saipan Island during cruise HI0702. These multibeam data were collected using SAIC ISS-2000 software in the Generic Sensor Format and processed using SABER editing software. Surface sound velocity values were supplied by a Seabird SBE-45 MicroTSG and a SBE-38 remote temperature probe. Sound velocity corrections from a Seabird 911 CTD sensor and motion corrections from a POS-MV vertical reference were applied to the data in real time. Predicted tides were applied to the data in real time.

Horizontal accuracy is 20 m (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 ~20-3000 m.

Concurrent mapping at Santa Rosa Reef, Guam Island, Rota Island, Tinian Island, and Saipan Island was done by the R/V AHI in water depths ranging from ~10-350m with the data set being AHI0702; (metadata for AHI0702 are submitted separately.)

Supplemental_Information:
Data were collected aboard the NOAA Ship Hi'ialakai, a 68 m (218') United States National Oceanographic and Atmospheric Agency (NOAA) research ship. The NOAA Ship Hiialakai's survey sensors include a 30 kHz Simrad EM300 sonar and a 300 kHz Simrad EM3002d sonar, which measures bathymetry and acoustic backscatter imagery, a TSS/Applanix POS/MV Model 320, which measures time, position, velocity, attitude and heading, and a Seabird SBE 9/11 plus CTD used to measure sound velocity profiles.

The Hi'ialakai's equipment serial numbers, software versions and sensor configuration settings are as follows:

SIMRAD EM300 multibeam echosounder Serial #: 303 PU Software Versions: PU: 2.0.3 060421 DDS: 3.27 2005/02/17 BSP: 2.3.3 050822 SPRX: 1.1.3 040427 SPTX: 2.0.0 040614 SIS Software Version: 3.2.2, build 54, Sept 7 2006

SIMRAD EM3002D multibeam echosounders Serial #: 357 and 353 PU Software Versions: HCT: 2.0.7 040906 BSP67 Master: 1.3.1 060113 BSP67 Slave: 1.3.1 060113 PU: 1.8.7 060831 DDS: 3.18 2005/11/24 SIS Software Version: 3.2.2, build 54, Sept 7 2006

HI'IALAKAI POS/MV Model 320, version 4.000000 PCS serial #: 2484.000000 IMU serial #: 1333 PCS Firmware: 2.900000 Controller software: v 3.410000

Seabird SBE 9/11 plus CTD: Serial #: 09P35130-0737

Hi'ialakai Lever Arm Distances and Alignment Offsets: The Hi'ialakai's Reference Point (RP) is a granite block situated 1.222 m starboard of the ship's centerline, 1.23 m above the ship's baseline/datum on the keel. The RP is located under the forward deck, in the ship's laundry room. The ship's sensors, the sonar systems and permanent benchmarks are measured with respect to the RP. Positive X means the point is forward of the RP, positive Y means the point is to starboard of the RP, positive Z means the point is below the RP. The survey waterline is defined to be at the 15' draft mark on the vessel's starboard side.

During the 2006-2007 winter inport period the main mast was replaced. POS antenas were surveyed in and a patch test was performed in mid April.

POS/MV Settings: RP to IMU, m X= 0.0 Y= 0.0 Z= 0.0 RP to Primary GPS(port),m X= -16.46 Y= -2.15 Z= -20.21 RP to Vessel, m X= 0.00 Y= 0.00 Z= 0.00 IMU w.r.t. Ref. Frame, deg X= 0.43 Y= -0.03 Z= 0.01 RP to Heave lever arm, m X= -14.53 Y= -1.18 Z= -5.23 Sensor 1 & 2 lever arms & angles: X= 0.0 Y= 0.0 Z= 0.0 Antenna Baseline Distance: 1.985

EM300 Settings: X Y Z Pos sensors 1 2 & 3, m 0 0 0 TX Transducer, m -4.09 -2.22 1.73 RX Transducer, m -6.07 -1.22 1.73 Attitude sensors 1 & 2, m 0 0 0 Waterline, m -3.25

Roll Pitch Heading TX Transducer, deg 0.00 0.00 0.00 RX Transducer, deg 0.00 0.00 0.00 Attitude 1, deg -0.11 0.00 0.00 Attitude 2, deg 0 0 0 Stand-alone heading, deg 0

EM3002D Settings: Pos sensors 1 2 & 3, m 0 0 0 Sonar head 1 (port), m 4.44 -1.48 1.56 Sonar head 2 (stbd), m 4.44 -0.96 1.56 Attitude sensors 1 & 2, m 0 0 0 Waterline, m -3.26 Depth sensor, m 0 0 0

Roll Pitch Heading Sonar head 1 (port), deg 39.83 0.97 0.43 Sonar head 2 (stbd), deg -39.62 1.13 358.56 Attitude 1, deg 0.00 0.00 0.00 Attitude 2, deg 0 0 0 Stand-alone heading, deg 0

Resource Description: EM300 and EM3002D Multibeam Sonar Data from Cruise Hi'ialakai HI0702

  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), 20070824, 2007 EM300 and EM3002D Multibeam Sonar Data from Cruise Hi'ialakai HI0702 - Commonwealth of the Northern Mariana Islands.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: 144.3376
    East_Bounding_Coordinate: 146.0304
    North_Bounding_Coordinate: 15.4153
    South_Bounding_Coordinate: 12.7621

  3. What does it look like?

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

    Beginning_Date: 12-May-2007
    Ending_Date: 22-May-2007
    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?

    NOAA Ship Hi'Ialakai

  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 in support of Coral Reef Conservation Program goals to map all shallow (0-30 m) coral reefs in US Pacific waters and priority moderate (> 30 m) depth areas by 2009. The data are being used to provide bathymetric and backscatter data for previously unmapped areas; in support of ecosystem management requirements for benthic habitat mapping and location of Essential Fish Habitat; and to study the geologic features of the area.


How was the data set created?

  1. From what previous works were the data drawn?

    Simrad EM300 (source 1 of 2)
    NOAA PIFSC CRED PIBHMC and JIMAR, 20070824, Simrad EM300 multibeam bathymetric data.

    Type_of_Source_Media: Digital data
    Source_Contribution:
    Simrad EM 300 (30 kHz) bathymetry and imagery data were collected in depths of ~100m-3000m. The EM 300 system was placed in stand-by mode in shallower water due to high noise levels.

    Simrad EM3002D (source 2 of 2)
    NOAA PIFSC CRED PIBHMC and JIMAR, 20070824, Simrad EM3002D Bathymetric Data.

    Type_of_Source_Media: Digital data
    Source_Contribution:
    Simrad EM3002D (300 kHz) bathymetry and imagery data were collected in depths of ~20-150m. The EM3002D system was placed in stand-by mode in water depths greater than ~150 m.

  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; predicted 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 consistent 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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