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)
20100901
Side-scan imagery of Apra Harbor, Guam U.S. Territory
digital data
http://www.soest.hawaii.edu/pibhmc
http://www.soest.hawaii.edu/pibhmc/pibhmc_cnmi_apra_backscat.htm
Gridded side-scan imagery collected in Apra Harbor, Guam U.S. Territory, USA. The GeoTIFF and
Arc ASCII file includes data that were collected using a Klein 3000 high-resolution side-scan sonar system
with dual operating frequencies of 100 and 500 kHz. The data were collected in 2008 by the NOAA Office
of Coast Survey and the United States Navy Fleet Survey Team and were preliminarily processed by NOAA
OCS using the Caris software. Additional processing and mosaicking was performed by the NOAA Coral Reef
Ecosystem Division.
The GeoTIFF and Arc ASCII of side-scan 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 the supplemental information for instrument
and survey information.
Survey data were acquired by the United States Navy (USN) Fleet
Survey Team (FST) with Survey Vessel Swamp Fox. The Klein 3000
Side Scan Sonar is operated in the stern-towed configuration.
Additional detailed information on data acquisition, equipment
configuration, and corrections can be found in the Data Acquisition
and Processing Report (DAPR) that can be accessed at: www.soest.hawaii.edu/pibhmc
and is included in the ZIP file containing the side-scan GeoTIFF.
20080329
20080504
ground condition
As needed
144.623
144.676
13.464
13.418
NCEI Geoportal FilterCoRIS_Metadata
CRCP Project
Benthic Habitat Mapping and Characterization - Commonwealth of the Northern Mariana Islands and Guam
1398
ISO 19115 Topic Category
imageryBaseMapsEarthCover
010
CoRIS Theme Thesaurus
EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Backscatter
CoRIS Discovery Thesaurus
Geographic Information > Backscatter
None
Acoustic Imagery
Side Scan
None
UTM Zone 55
Apra Harbor
Guam Island
U.S. Territory
United States of America
CoRIS Place Thesaurus
OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > Apra Harbour (13N144E0051)
COUNTRY/TERRITORY > United States of America > Guam > Apra Harbour (13N144E0051)
CoRIS Region
Guam
None
These data are not to be used for navigation purposes.
Please acknowledge NOAA (Office of Ocean Exploration and the
Pacific Islands Fisheries Science Center) and the Joint Institute for
Marine and Atmospheric Research (JIMAR) University of Hawaii, the NOAA
Office of Coast Survey, and the USN Fleet Survey Team 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/CNMI_images/apra_ss_1m_445.jpg
Side Scan/Acoustic Imagery
JPG
Benthic Habitat Mapping Group, Coral Reef Ecosystem Division
(CRED), Pacific Islands Fisheries Science Center (PIFSC), NOAA and the Joint
Institute for Marine and Atmospheric Research (JIMAR) are the sources of
this information.
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.
These data are believed to be logically consistent
though no tests were performed
Complete
Horizontal positioning system: see DAPR
Horizontal position accuracy: see DAPR
see DAPR
Range resolution of sonar: see DAPR
Raw sounding resolution: see DAPR
Vertical accuracy of gridded product: see DAPR
The Klein 3000 system consists of a Klein towfish, a Transceiver/Processing Unit (TPU),
and a computer for user interface. The along-track resolution is approximately 30cm at
the 100m range scale, even when acquiring data at speeds up to 10 knots. Across-track
resolution is typically 7.5cm at the 100m range scale. The achievable 0.3m resolution
meets the OCS Hydrographic Surveys Specifications and Deliverables Manual for object
detection. ISIS Sonar Pro is used to acquire data with the Klein 3000 SSS. Sonar Pro is
a Windows-based acquisition software package that provides real-time data
display and sonar control. Sonar Pro is used to acquire Klein 3000 data in XTF format.
Data acquisition is monitored real time by a qualified sonar operator.
The primary user settings that are adjustable during SSS acquisition are the range scale
and the resolution. Typically, the range scale and resolution are set prior to logging data
and not changed again until the surveyed depth area changes.
Caris HIPS/SIPS (Hydrographic Information Processing System/ Side-scan Information
Processing System) is used for processing, correcting, and analyzing all bathymetric, side
scan, and phase-differencing bathymetric sonar data. Caris SIPS is used for converting and
correcting side-scan sonar imagery and for contact selection and mosaic generation. After
acquisition, SSS data are converted from XTF format to Caris HDCS format. Fish
height, vessel heading (gyro), and vessel navigation records are then reviewed and
corrected and recalculated. Data are then slant-range corrected to 0.1m with beam
pattern correction. Side scan mosaics were created using the SIPS side scan editor. Mosaics
consisted of combinations of lines that resulted in a seamless product after interpolation
was applied during GeoBAR creation in Caris SIPS. Since the dataset is so large, a final
mosaic was created using ArcGIS 9.x Raster Dataset Tools in the Toolbox. See the SWAMPFOX
Data Acquisition and Processing Report included in the side-scan data download ZIP file
(apra_ss_1m.zip) available from http://www.soest.hawaii.edu/pibhmc.
20101122
Raster
Grid Cell
5127
5727
1
Universal Transverse Mercator
55
0.9996
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
Backscatter 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 hardness
and 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
ftp://ftp.soest.hawaii.edu/pibhmc/website/data/cnmi-guam/backscatter/apra_ss_1m.rar
Arc ASCII, .asc
The Arc ASCII file,
for use in ESRI's (http://www.esri.com) GIS software, can be converted to an Arc Raster Grid using
ArcToolbox ASCII to Raster conversion tool.
none
ftp://ftp.soest.hawaii.edu/pibhmc/website/data/cnmi-guam/backscatter/apra_ss_1m.rar
None
20200329
20101202
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
Local Time
None
None
20101202025054
None
20080329
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https://www.coris.noaa.gov/metadata/records/html/apra_ss_1m.html
6065