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)
20100701
40 m Gridded bathymetry of Swains Island, American Samoa (Arc ASCII format)
raster digital data
http://www.soest.hawaii.edu/pibhmc
http://www.soest.hawaii.edu/pibhmc/pibhmc_amsamoa_swains_bathy.htm
Gridded bathymetry (40 m cell size) of the slope environment of
Swains Island, American Samoa. Almost complete bottom coverage was achieved
in depths between 7 and 4800 m. The multibeam data are from the Simrad EM300
system aboard the NOAA Ship Hi'ialakai, and the Reson 8101ER system aboard the
R/V AHI and were collected from 10th - 13th February 2006.
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 NOAA Ship Hiialakai, a 218' United States
National Oceanographic and Atmospheric Administration research ship. The NOAA
Ship Hiialakai'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. Sensor configuration for the Hi'ialakai for
cruise HI-06-02 is documented in the cruise/multibeam metadata file
HI0602_MB_Metadata.txt.
Data were also 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. Sensor configuration for the AHI for cruise AHI-06-02
is documented in the cruise/multibeam metadata file AHI0602_MB_Metadata.txt.
20040210
20060313
ground condition
As needed
-171.218623090848
-170.938117186678
-10.935484848778
-11.188300163771
NCEI Geoportal FilterCoRIS_Metadata
CRCP Project
Benthic Habitat Mapping and Characterization - American Samoa and PRIA
1084
CoRIS Discovery Thesaurus
Geographic Information > Bathymetry
ISO 19115 Topic Category
elevation
006
CoRIS Theme Thesaurus
EARTH SCIENCE > Biosphere > Aquatic Habitat > Reef Habitat > Description
EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Bathymetry
EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Water Depth
CoRIS Place Thesaurus
OCEAN BASIN > Pacific Ocean > American Samoa > Swains Atoll (11S171W0001)
COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Swains Atoll (11S171W0001)
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 and the Pacific Islands Benthic
Habitat Mapping Center, School of Ocean and Earth Science and Technology, 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)
John Rooney
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/amsamoa_images/Swains_40m_445.jpg
Gridded Bathymetry
jpg
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.
These data are believed to be logically consistent
though no tests were performed
Complete
Horizontal positioning system: GPS C/A
Horizontal position accuracy: 25 meters
Range resolution of sonar: varies with depth
Raw sounding resolution: varies with depth
Vertical accuracy of gridded product ~ 1% of water depth
Multibeam swath files are acquired in the Generic Sensor Format (GSF) and
are edited on a swath by swath basis using SAIC's SABER editing software.
The edited swath files are then combined into a Pure File Magic (PFM) format
in SABER and area based editing is performed. The edited PFM is then exported
as X,Y,Z. The resulting X,Y,Z data are then gridded using nearneighbor, a Generic
Mapping Tools (GMT) algorithm that reads arbitrarily located X,Y,Z and assigns an
average value to each grid node that has one or more points within a 200 m radius
centered on the node and outputs a netCDF grid file. GMT is an open source collection
of tools for manipulating geographic data sets. Grid nodes with more than one value are
set to the average value and unconstrained nodes are set to NaN. Finally, the netCDF grid
is clipped at a depth that minimizes data gaps for the specified grid cell size and
then converted to an ArcGIS ASCII file format using LINUX/UNIX commands in
combination with GMT. Additional information about GMT can be found at:
www.soest.hawaii.edu/gmt and additional information about the multibeam data
processing is recorded in the cruise metadata report AHI0602_MB_Metadata.txt
and AHI0602_MB_Metadata.txt
20100607
Raster
Grid Cell
699
766
1
Universal Transverse Mercator
-2
0.9996
-171
0
500000
1000000
Row and Column
40
40
meters
D_WGS_1984
WGS_1984
6378137.000000
298.257224
mean lower low water
0.01
meters
Attribute Values
Depth values are real values based on the average of the
soundings that fell within the extracted grid cells. The number of
soundings per grid cell range from >1000 soundings in shallow depths
to as few as 20 soundings in deeper areas. A total error budget for
this survey has not been developed. Therefore, the accuracy of depth
measurements should be considered to be within 1 per cent of water depth.
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)
John Rooney
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.
Arc ASCII
Arc ASCII can be converted to Arc
Raster using ArcToolbox Conversion Tools (ASCIItoRaster).
ftp://ftp.soest.hawaii.edu/pibhmc/website/data/amsamoa/bathymetry/Swains_40m.asc.zip
None
20200329
20101102
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 Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
Universal Time
None
None
20101102025635
None
20040210
20060313
https://www.coris.noaa.gov/metadata/records/html/swains_40m_asc.html
6027