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)
20111102
Gridded multibeam bathymetry of Guam Island, Guam U.S.
Territory
digital data
http://www.soest.hawaii.edu/pibhmc
http://www.soest.hawaii.edu/pibhmc/pibhmc_cnmi_gua_bathy.htm
Gridded bathymetry shelf, bank and slope environments of
Guam Island, Guam U.S. Territory. Bottom coverage was achieved in
depths between 0 and 3500 meters. The netCDF and Arc ASCII grids
include multibeam bathymetry from the Simrad EM300 and Reson 8101
multibeam sonars collected as of June 2007 by the NOAA Coral Reef
Ecosystem Division. The sonar frequencies are 30 and 240 kHz
respectively.
These netCDF and ASCII grids 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.
Multibeam 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.
Additional data were collected aboard the NOAA vessel Oscar Elton Sette, a 68 m
(224') United States National Oceanographic and Atmospheric
Agency (NOAA) research ship. The Oscar Elton Sette deployed an over the side pole
mounted survey sensors system including 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
velocity profiles.
Specific equipment configurations are documented in metadata from
cruises AHI0307, AHI0702, HI0702,and SE1002. These metadata can be accessed
at: http://www.soest.hawaii.edu/pibhmc/pibhmc_cruise-catalog.htm
20030922
20100314
ground condition
As needed
144.326
145.116
13.913
12.761
CoRIS Theme Thesaurus
EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Bathymetry
ISO 19115 Topic Category
elevation
006
CoRIS Discovery Thesaurus
Geographic Information > Bathymetry
None
Bathymetry
Multibeam sonar
None
Guam
Territory of Guam
United States of America
CoRIS Place Thesaurus
OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > Guam (13N144E0000)
COUNTRY/TERRITORY > United States of America > Guam > Guam (13N144E0000)
CoRIS Region
Guam
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
1125B Ala Moana Blvd.
Honolulu
HI
96814
(808) 983-3776
(808) 983-2902
pibhmc@soest.hawaii.edu
e-mail preferred
http://www.soest.hawaii.edu/pibhmc/CNMI_images/Guam_60m_445.jpg
Multibeam Bathymetry
JPEG
PIBHMC, CRED, PIFSC, NOAA and JIMAR
Not applicable
Unclassified
Not applicable
netCDF file created using the Generic
Mapping Tools (GMT) and ArcGIS ASCII file, both created 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 m
1 m
Raw sounding resolution: Variable
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 xyz2grd, a Generic
Mapping Tools (GMT) algorithm that converts an ASCII or binary table to a netCDF
grid file format. 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.
20110930
Raster
Grid Cell
2113
1408
1
Universal Transverse Mercator
55
0.9996
147
0
500000
0
Row and Column
60
60
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 these data have not been developed. Therefore, the
accuracy of depth measurements should be considered to be within
1 meter.
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
1125B Ala Moana Blvd.
Honolulu
HI
96814
(808) 983-3776
(808) 983-2902
pibhmc@soest.hawaii.edu
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 and Arc ASCII
These data can be downloaded as either a 2-D binary netCDF raster
grid or an ArcGIS ASCII text file. The netCDF grid
is the default grid file format used by GMT (Generic Mapping
Tools), which created this file. More information can be located
at http://www.soest.hawaii.edu/gmt/and
http://www.unidata.ucar.edu/software/netcdf/. 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.
http://www.soest.hawaii.edu/pibhmc/pibhmc_cnmi_gua_bathy.htm
None
20121220
20111108
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
1125B Ala Moana Blvd.
Honolulu
HI
96814
(808) 983-3776
(808) 983-2902
pibhmc@soest.hawaii.edu
e-mail preferred
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
Universal Time
None
None
20111108081904
None
20030922
20100314
http://www.coris.noaa.gov/metadata/records/html/guam_60m.html
6407