Reson 8101ER multibeam Data were collected between
21 August and 13 September 2003 (JD 233-256) aboard NOAA Survey
Launch Acoustic Habitat Investigator (AHI) at Saipan and Tinian Islands and
Tatsumi and Marpi Banks in the Commonwealth of the Northern
Mariana Islands in the Western Pacific during cruise OES-03-07/AHI-03-07.
The AHI was deployed independently from the NOAA Ship Oscar
Elton Sette (OEs).
The multibeam data were logged into data set Saipan
and collected using SAIC ISS-2000 software in the Generic Sensor Format
and processed using SABER editing software. Sound velocity
corrections from a Seabird SBE19 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 and observed tides from Guam tide gauge
1630000 with a time corrector of 18 minutes and a tide height
multiplier of 0.94 were applied using SABER postprocessing
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 10 - 300 m.
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.
Data were collected aboard the R/V AHI (Acoustic Habitat
Investigator), a 8 m (25') survey launch owned and operated
by the NOAA Pacific Islands Fisheries Science Center in
Honolulu, HI. The R/V AHI's survey sensors include a 240
kHz RESON 8101-ER 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 19 CTD used to measure sound
The AHI's equipment serial numbers, software versions and
sensor configuration settings are as follows:
RESON 8101-ER multibeam echosounder
DOC inventory #: CD0000537418
Transducer serial #: 201004
Firmware, dry: 8101-2.07-2D4D
Firmware, wet: 8101-1.06-2F6B
R/V AHI POS/MV Model 320, version 3
DOC inventory #: CD0000476647
PCS serial #: 474
IMU serial #: 203
Controller software: v 184.108.40.206
PCS Firmware: 2.16
Seabird SBE19 CTD:
Serial #: 3029
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.
Antenna Baseline Distance, m: 1.229
Transducer depth below waterline, m 0.62
RP to IMU 0.80 0.00 0.08
RP to Primary GPS Antenna -3.55 -0.61 -1.88
RP to Vessel 0.16 0.00 0.77
RP to Sensor 1(MB transducer) 0.16 0.00 0.77
RP to Sensor 2 0 0 0
RP to Aux. GPS Antenna 0 0 0
RP to Heave lever arm(deg) -0.67 0.00 0.00
IMU rotation Ref. Frame, deg 0 0 0
Sensor 1 rotation Ref. Frame, deg 0 0 0
Sensor 2 rotation Ref. Frame, deg 0 0 0
Roll offset: +0.5 deg
Pitch offset: 0.0 deg
Gyro offset: 0.0 deg
Resource Description: Reson 8101ER Multibeam Sonar Data from
Cruise OES-03-07/AHI-03-07. Data Set Name: Saipan.
These data are NOT TO BE USED FOR NAVIGATION
1845 WASP Blvd., Building 176
Joyce E. Miller Coral Reef Ecosystem Division,
NOAA Pacific Islands Fisheries Science Center
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.
These data are believed to be logically consistent though no tests were performed
Multibeam sonar data. No DGPS corrections applied; 20 m accuracy
Accuracy varies with water depth. Predicted tide correctors applied; multibeam data vertical accuracy is ~1% of water depth.
Reson 8101ER (240 kHz) bathymetry and imagery data were collected in depths of ~10-300 m.
Generic Sensor Format multibeam data were processed with SAIC SABER processing software and converted to gridded bathymetry products. See product metadata for detailed processing steps.
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 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