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)
20071201
CRED Simrad EM300 multibeam backscatter data from portions of
the banktop and bank edge environments at Pearl and Hermes
Atoll, Hawaii, USA with 30 meter resolution
digital data
ftp://ftp.soest.hawaii.edu/pibhmc
Multibeam backscatter imagery extracted from gridded
bathymetry of Pearl and Hermes Atoll, Northwestern Hawaiian
Islands, USA.
These data provide coverage between 0 and 2000 meters. The
backscatter dataset includes data collected using the Simrad
EM300 multibeam sonar. The sonars frequency is 30 kHz. These
metadata are for the 30 m grid cell size Simrad EM300 multibeam
backscatter data only.
The GeoTIFFs and netCDF grids of backscatter imagery were
created using data gathered from multibeam soundings for use as
a planning and reference document. The data are also being used
for benthic habitat mapping, for locating Essential Fish
Habitat, and for studying geologic features of the area. Refer
to supplemental information for description of instrument and
survey.
Multibeam data were collected aboard the NOAA Ship Hi'ialakai, a
218' United States National Oceanographic and Atmospheric
Administration research ship. The NOAA Ship Hi'ialakai's survey
sensors include a 30 kHz Simrad EM300 sonar and a 300 kHz Simrad
EM3002d sonar, which provide bathymetry and imagery data, a
TSS/Applanix POS/MV Model 320, which measures position,
velocity, attitude and heading, and a Seabird SBE 9/11 plus CTD
used to measure sound velocity profiles. Specific equipment
configurations are documented in metadata from cruises HI0609.
These metadata can be accessed at
http://www.soest.hawaii.edu/pibhmc/cms/cruise-catalog/.
20000623
20060720
ground condition
As needed
-176.12
-175.14
28.37
27.63
NCEI Geoportal FilterCoRIS_Metadata
CRCP Project
Benthic Habitat Mapping and Characterization - Northwestern and Main Hawaiian Islands
1217
none
EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Backscatter
Acoustic Imagery
Multibeam Backscatter
Backscatter
CoRIS Theme Thesaurus
EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Backscatter
ISO 19115 Topic Category
oceans
014
elevation
006
CoRIS Discovery Thesaurus
Geographic Information > Backscatter
CoRIS Place Thesaurus
OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Northwestern Hawaiian Islands > Pearl and Hermes Reef (27N176W0001)
COUNTRY/TERRITORY > United States of America > Hawaii > Honolulu > Pearl and Hermes Reef (27N176W0001)
CoRIS Region
NWHI
None
Pearl and Hermes Atoll
Hawaii
Northwestern Hawaiian Islands
United States of America
none
OCEAN BASIN > Pacific Ocean > Central Pacific
Ocean > Hawaiian Islands > Pearl and Hermes Atoll
COUNTRY/TERRITORY > United States of America >
Hawaii > Honolulu
None
These data are not to be used for navigation purposes.
Please acknowledge NOAA and the Joint Institute for
Marine and Atmospheric Research (JIMAR) University of Hawaii as
the sources 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
http://www.soest.hawaii.edu/pibhmc/NWHI_images/ph_bs_440.jpg
Multibeam Backscatter, Acoustic Imagery
JPEG
http://www.soest.hawaii.edu/pibhmc/NWHI_images/ph_em300_boxes_440.jpg
Multibeam Backscatter, Acoustic Imagery
JPEG
PIBHMC, CRED, PIFSC, NOAA and JIMAR
Not applicable
Unclassified
Not applicable
GeoTIFF and netCDF grid file created
using HMRG software in a LINUX environment
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.
These data are believed to be logically
consistent though no tests were performed
Complete
Horizontal positioning system: GPS (SPS)
Horizontal position accuracy: 25 meters
1 m
Range resolution of sonar ~1.25 cm
Raw sounding resolution: Variable
Vertical accuracy of gridded product: 1% of water depth
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. Additional data
acquisition and processing information can be found in the
metadata for cruises HI0609 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 gsf2bs
program (July, 2005) converts the swath bathymetry ping records
contained within a GSF (Generic Sensor Format) version 2.02
dataset into bs file 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 comparing travel times of
beams adjacent to the gap, assigning the position using the
adjacent sample closest to nadir, and averaging the interpolated
values that fall within a cell. 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 GeoTIFF's. For more
information on the backscatter processing technique see
<http://www.soest.hawaii.edu/pibhmc/pibhmc_documentation.htm>.
Software_Used:
SAIC ISS-2000 Acquisition Software, v 3.4
SAIC SABER Processing Software, v 3.3.15
Hawaii Mapping Research Group (HMRG) Processing Software
GMT Generic Mapping Tools, v 4.1
MB System, v 5.0.7
20070818
Raster
Grid Cell
3195
2717
1
Universal Transverse Mercator
-1
0.9996
-177
0
500000
0
Row and Column
30
30
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.
GeoTIFF, .tif
TIFF is a format for storage, transfer, display, and printing of
raster images. The TIFF file structure allows both the tag 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. The GeoTIFF format is public domain, non-proprietary.
none
http://www.soest.hawaii.edu/pibhmc/cms/data-by-location/northwest-hawaiian-islands/pearl-and-hermes-atoll/backscatter/
netCDF, .grd
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). The file was created by the HMRG sofware program bsovl.
More information about netCDF files can be found at at
http://www.soest.hawaii.edu/gmt/ and
http://www.unidata.ucar.edu/software/netcdf/.
none
http://www.soest.hawaii.edu/pibhmc
None
20190605
20110318
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
FGDC Content Standards for Digital
Geospatial Metadata
FGDC-STD-001-1998
Universal Time
None
None
20090427062807
None
20000623
20060720
https://www.coris.noaa.gov/metadata/records/html/cred_backscatter_ph_em300_30m.html
4024