Horizontal accuracy is ~5m (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 10 - 200 m. The AHI was deployed from shore.
The AHI's equipment serial numbers, software versions and sensor configuration settings are as follows:
RESON 8101-ER multibeam echosounder Transducer serial #: 201004 Firmware, dry: 8101-2.07-2D4D Firmware, wet: 8101-1.06-2F6B
R/V AHI POS/MV Model 320, version 4.0000 (w/ TrueHeave but no RTK) PCS serial #: 2514 IMU serial #: 203 Controller software: v 3.4.0.0 PCS Firmware: 3.41
Seabird SBE19 CTD: Serial #: 3029 Last Callibration: 06/17/2008
R/V AHI Lever Arm Distances and Alignment Offsets: The R/V AHI Reference Point (RP) is defined to be the intersection of the vessel's centerline, the cabin deck and the bulkhead immediately aft of the transducer. This is marked by a punch in the deck weld at that location. 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 loaded waterline is defined as the intersection of the vessel's performance wing with the hull at the transom.
POS/MV Settings: RP to IMU, m 0.80 0.00 0.08 RP to Primary GPS(port),m 0.85 -0.50 -2.29 RP to Vessel, m 0.16 0.00 0.77 IMU w.r.t. Ref. Frame, deg 0.00 0.00 0.00 RP to Heave lever arm, m -0.67 0.00 0.00 RP to Sensor 1(MB transducer), m 0.16 0.00 0.77 RP to Sensor 2 0 0 0 Sensor 1 rotation Ref. Frame, deg 0 0 0 Sensor 2 rotation Ref. Frame, deg 0 0 0 Antenna Baseline Distance: 1.229
ISS2000 Settings for RESON DTC: Roll Bias, deg 0.34 Pitch Bias, deg 0.020 Gyro Bias, deg 0.0 Transducer depth, m 0.62
Resource Description: Reson 8101ER Multibeam Sonar Data from Cruise AHI-09-02 (R/V AHI)
Online Links:
John Rooney, Coral Reef Ecosystem Division, NOAA Pacific Islands Fisheries Science Center
The bathymetric data collection was conducted to support investigations to minimize the impact of cable routes to the coral reef environemt and benthic habitat. The data are being used to provide bathymetric and backscatter data for areas of interest, and previously unmapped areas around Oahu, Lanai, Molokai, and Maui and in support of the Department of Business, Economic Development & Tourism cable routes surveys efforts for the Main Hawaiian Islands.
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
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.
Please contact the Distributor (see above) for distribution optionsData Format - Generic Sensor Format, as described in http://www.ldeo.columbia.edu/res/pi/MB-System/formatdoc/gsf_spec.pdf