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)
200508
CRED Acoustic Backscatter Manua Islands, American Samoa 2004; Imagery Extracted from Gridded Bathymetry of the Surrounding Banktop and Slope Environments
raster digital data and geoTIFF image
http://www.soest.hawaii.edu/pibhmc/
Backscatter extracted from gridded bathymetry of the banktops and slope of Ofu and Olosega Islands of the
Manu'a Island group, American Samoa. This survey provides almost complete coverage between 20 and 250 meters.
This netCDF grid of acoustic imagery was created using data gathered from multibeam soundings for use as a planning
and reference document. Refer to supplemental information for description of instrument and survey.
Data were collected aboard the R/V AHI (Acoustic Habitat Investigator), a 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 providing bathymetry and imagery data, a TSS/Applanix POS/MV Model 320 which measures position,
velocity, attitude and heading, and a Seabird SBE 19 CTD used to measure sound velocity profiles.
Equipment serial numbers and software versions are as follows:
RESON 8101-ER multibeam echosounder
DOC inventory #: CD0000537418
Firmware, dry: 8101-2.07-2D4D
Firmware, wet: 8101-1.06-2F6B
POS/MV Model 320, version 3
DOC inventory #: CD0000476647
PCS serial #: 474
IMU serial #: 203
Controller software: v 1.0.5.0
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
20040205
20040212
ground condition
As needed
-169.708
-169.388
-14.1304
-14.2917
NCEI Geoportal FilterCoRIS_Metadata
CRCP Project
Benthic Habitat Mapping and Characterization - American Samoa and PRIA
1084
CoRIS Theme Thesaurus
EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Water Depth
CoRIS Discovery Thesaurus
Geographic Information > Backscatter
None
Acoustic Imagery
Backscatter
Sidescan
AHI0402
ISO 19115 Topic Category
elevation
006
oceans
014
CoRIS Place Thesaurus
OCEAN BASIN > Pacific Ocean > Manu'a Group > Ofu Island (14S169W0013)
COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Ofu Island (14S169W0013)
OCEAN BASIN > Pacific Ocean > Manu'a Group > Ofu (14S169W0002)
COUNTRY/TERRITORY > United States of America > American Samoa > Ofu Island > Ofu (14S169W0002)
OCEAN BASIN > Pacific Ocean > Manu'a Group > Olosega Island (14S169W0014)
COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Olosega Island (14S169W0014)
None
Manu'a Islands
CoRIS Region
AmSam
None
These data are not to be used for navigation purposes. Please acknowledge the NOAA Coral Reef Ecosystem
Division, Pacific Islands Fisheries Science Center as the source of this information.
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)
mailing and physical address
NOAA IRC
NMFS/PIFSC/CRED
1845 WASP Blvd., Building 176
Honolulu
HI
96818
808 725-5360
808 725-5429
nmfs.pic.credinfo@noaa.gov
e-mail preferred
Benthic Habitat Mapping Group, Coral Reef Ecosystem Division
(CRED), Pacific Islands Fisheries Science Center (PIFSC), NOAA
Not applicable
Unclassified
Not applicable
Data are collected for resource management
and research purposes and are tested for internal consistency; however,
no effort is made to compare these data to external references or to
other published data.
Unspecified
Complete
Horizontal positioning system: GPS SPS
Horizontal position accuracy: 1.0 meters
Range resolution of sonar: 1.25 cm
Raw sounding resolution: 1 cm
Vertical accuracy of gridded product: 1 meter
Science Applications International Corporation's
(SAIC) ISS-2000 acquires, processes and records data, provides survey
control and underway quality control displays. SAIC's SABER processing
software is used to process the raw soundings, analyze the results,
manually edit the sounding data to remove outliers and derive average
gridded data values.
The data have been corrected for observed tides from Guam tide gauge
1630000 with a time corrector of 18 minutes and a tide height multiplier
of 0.94 using SABER postprocessing software. The data were also
recorrected for observed sound velocities in postprocessing.
Hawaii Mapping Research Group (HMRG) processing software was then used to
extract values of acoustic intensity from the soundings. HMRG is an organization
of scientists, engineers and technicians whose mission is to design, build, and operate
tools for mapping the seafloor. HMRG is a group within the School of Ocean and Earth
Science and Technology at the University of Hawaii at Manoa. The gsf2mr program (July, 2003)
converts the swath bathymetry ping records contained within a GSF (Generic Sensor
Format) version 2.02 dataset into mr1file format. This is done as follows: (i) position each
beam's bottom detect intensity sample at the across-track location of that beam's bathymetry
value; (ii) assuming a flat bottom in the near neighborhood of the beam, compute across-track
distances for all of the beam's remaining intensity samples based on their temporal relation to
the bottom detect sample and the computed average sound velocity for that beam as derived from
its range and travel time; (iii) after all of the intensity samples from all beams of a ping
have been located in across-track distance, fill the gaps between them as necessary by
interpolation.
The conversion described above is necessary in order to run HMRG backscatter processing
operations on the data, such as filtering to remove noise, and to create netCDF grids, raster
images and geotiffs.
GMT was then used to reformat the acoustic imagery when necessary. Interactive
Visualization System's Fledermaus, ESRI ArcGIS, and RSI ENVI were used for
viewing results and creating browse objects.
Software used:
SAIC ISS-2000 Acquisition Software, v 3.4 (20030610)
SAIC SABER Processing Software, v 2.0.2 (20030610)
Hawaii Mapping Research Group (HMRG) Processing Software
GMT Generic Mapping Tools, v 3.4.2 (20021002)
20050520
Raster
Grid Cell
6520
7668
1
Universal Transverse Mercator
2
9.9996
147
0
500000
0
Row and Column
1
1
meters
D_WGS_1984
WGS_1984
6378137.000000
298.257224
mean lower low water
0.01
meters
Attribute Values
Sidescan data within a GSF file are arranged as small sequences of intensity
values, one sequence per beam per ping. The intensity values represent the
amplitude of echo returns to the sensor and can be related to seabed
roughness.
none
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)
mailing and physical address
NOAA IRC
NMFS/PIFSC/CRED
1845 WASP Blvd., Building 176
Honolulu
HI
96818
808 725-5360
808 725-5429
nmfs.pic.credinfo@noaa.gov
e-mail preferred
Downloadable Data
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.
netCDF
unZIP
https://www.pifsc.noaa.gov/cred/hmapping/map_manua.php
ftp://ftp.soest.hawaii.edu/pibhmc/website/data/amsamoa/backscatter/manua/
Binary netCDF Grid:
This file is formatted as a 2-D binary netCDF grid file. This is the default
grid file format used by GMT (Generic Mapping Tools), which created this file.
More information can be be located at
http://unidata.ucar.edu/packages/netcdf/index.html
List of Manua backscatter netCDF grid files:
manua-8-01.grd.zip
manua-8-02.grd.zip
manua-8-03.grd.zip
manua-8-04.grd.zip
manua-8-05.grd.zip
manua-8-06.grd.zip
manua-8-07.grd.zip
geoTIFF
ftp://ftp.soest.hawaii.edu/pibhmc/website/data/amsamoa/backscatter/manua/
TIFF is a format for storage, transfer, display, and printing of raster images. The TIFF file structure allows both the metadata and the image data to be encoded into the same file. GeoTIFF refers to a TIFF file that has geographic data embedded as tags within the TIFF file. The geographic data can be used to position the image in the correct location and geometry on the screen of a geographic information display. Any GIS, CAD, Image Processing, Desktop Mapping and other types of systems using geographic images can read any GeoTiff file. More specifically, files of this type can be added to ArcInfo and ArcView 8.x or higher and may be viewed in the Table of Contents as a new raster layer. Image visualization software that does not use geography as a basis for image placement can view a GeoTIFF image as if there were no geographic information in the TIFF file. For example, GeoTIFF files can be viewed using Windows Picture and Fax viewer without geographic information.The GeoTIFF format is public domain, non-proprietary.
List of Manua backscatter GeoTIFF files:
manua-8-01.zip
manua-8-02.zip
manua-8-03.zip
manua-8-04.zip
manua-8-05.zip
manua-8-06.zip
manua-8-07.zip
None
20200329
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)
CRED Data Management Team
mailing and physical address
NOAA IRC
NMFS/PIFSC/CRED
1845 WASP Blvd., Building 176
Honolulu
HI
96818
808 725-5360
808 725-5429
nmfs.pic.credinfo@noaa.gov
e-mail preferred
FGDC Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998
20061004075602
None
20040205
20040212
https://www.coris.noaa.gov/metadata/records/html/cred_backscatter_manua_islands_2004.html
1448