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)
20080915
Bathymetric Position Index (BPI) Structures 60 m grid derived from gridded
bathymetry of the U.S. Territory of Guam.
raster digital data
http://www.soest.hawaii.edu/pibhmc
BPI Structures are derived from two scales of a focal mean
analysis on bathymetry and slope. The grid is based on
gridded (60 m cell size) multibeam bathymetry, collected aboard NOAA
Ship Hi'ialakai and R/V AHI, and it was created using the Benthic
Terrain Modeler (http://www.csc.noaa.gov/products/btm/). Cell values
represent one of 13 classes in an index of seafloor terrains. This
data set is for the shelf and slope environments of Guam Island. As
part of the southern islands in the Mariana Islands archipelago,
Guam has a shelf (above -100m) with escarpments that lead to broad
flat areas without forming a deeper shelf. Conversely, the northern
islands each have a shelf (above -60m), and most have a deep shelf
(below -60m), with escarpments that lead outside of the coverage area.
The data were derived in support of Coral Reef Conservation
Program goals. Goal 1 is to map all U.S. Coral Reef Ecosystems.
This data set specifically addresses Objective 1 and 4: to develop
high-resolution benthic maps and to characterize priority deep
water reefs and associated habitats. This derivative of
bathymetry provides a GIS layer that may be used for benthic and
essential fish habitat characterization, and for the study of
geologic features. By combining the dataset with bathymetry,
backscatter, other derivatives, and in situ data, they
collectively compose benthic habitat maps which are designed to
be used to understand and predict moderate to deep depth
(~10m to 3500m) benthic habitats for different organisms that
inhabit coral reef ecosystems.
Gridded multibeam data were collected aboard the Hi'ialakai, a
218' United States National Oceanographic and Atmospheric
Administration (NOAA) research ship, and 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 metadata for the bathymetry is documented in
the product metadata, guam_60m.txt.
(http://www.soest.hawaii.edu/pibhmc/pibhmc_cnmi_bathy.htm)
References:
Lundblad et al., 2006, A benthic terrain classification scheme for
American Samoa, Marine Geodesy, 29(2):89 - 111.
http://www.csc.noaa.gov/products/btm/
The terrestrial elevation data shown in the map for this data set are
SRTM Finished 3 arc sec Shaded Relief. They were collected during
NASA's Shuttle Radar Topograph Mission (SRTM). For more information
on the mission, go to:
http://www2.jpl.nasa.gov/srtm/faq.html#data. The data are available
from the United States Geological Survey (USGS) as reformatted
elevation data that are consistent with other Digital Elevation Models.
20030922
20070522
ground condition
As needed
144.326
145.116
13.913
12.761
NCEI Geoportal FilterCoRIS_MetadataCRCP ProjectM218 Benthic Habitat Mapping and Characterization in the Pacific Islands Region1217
CoRIS Discovery Thesaurus
Geographic Information > Habitats
ISO 19115 Topic Category
imageryBaseMapsEarthCover
010
CoRIS Theme Thesaurus
EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Bathymetric Position Index Structures
EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Mapping > geomorphology Mapping
None
Bathymetric Position Index Structures
Bathymetry
Multibeam sonar
None
Guam Island
Mariana Islands
United States Territory
United State 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 the NOAA Pacific Islands Fisheries
Science Center (PIFSC) Coral Reef Ecosystem Division (CRED) and
the Pacific Islands Benthic Habitat Mapping Center (PIBHMC), and
the Joint Institute for Marine and Atmospheric Research (JIMAR)
as the sources of this information.
http://www.soest.hawaii.edu/pibhmc/CNMI_images/guam_60m_BPIstructures_445.jpg
Gridded Bathymetry Derivative
JPG
NOAA PIFSC CRED PIBHMC and JIMAR
Not applicable
Unclassified
Not applicable
ArcGIS ASCII file, derived from bathymetry and
slope in ArcGIS 9.3 (Spatial Analyst and Benthic Terrain Modeler)
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
Bathymetric Position Index Structures were derived from the gridded
multibeam bathymetry (guam_60m) using the Benthic Terrain Modeler
(BTM). The BTM (written for ArcGIS 8.x or 9.x) may be downloaded from
http://dusk2.geo.orst.edu/djl/samoa/tools.html.
BPI Structures are derived from two scales of a focal mean analysis
on bathymetry and slope. After testing combinations, two
scales of bpi (240 and 1020) were chosen for Guam Island. Two fine
scale factors (180, 240) and two broad scale factors (1020, 1800)
were tested in different combinations. After measuring
many of the bathymetric features that indicate possible reef structures
when overlaid on the hillshade, the scale factors were chosen.
Multiple scales of BPI grids were created and used in the Terrain
Classification Builder (part of the BTM) to create multiple structure
and zone grids. The combination of 180 and 1020 (or 1800) brought out
those fine scale structures, including the broad crests, which are very
important in coral reef environments. However, the fine scale factor
of 240 defined the fine scale structures as more continuous features and
cancelled out a lot of the noise that was falsely defined by using 180.
As for the broad scale factor, using 1020 instead of 1800 separated
features that are not bathymetrically continuous, better defining unique
broad scale features. Additionally, three ranges of slope define flats,
slopes, and near vertical: x < 5; 5 < x < 70; x > 70. Depth bounds
separated broad flat (< -100m) structures from the shelf (0 to -100m)
environments. The deep shelf class was excluded for Guam since there is
not a step in the bathymetry offshore of Guam, rather a gradual escarpment
with broad flat areas. The shelf depth was based on the bathymetric drop
off just offshore (within ~ 1km from shore) of Guam.
20080904
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
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).
http://www.soest.hawaii.edu/pibhmc/pibhmc_cnmi_gua_geomorph.htm
None
20200329
20090506
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
20090506013352
None
20030922
20070522
https://www.coris.noaa.gov/metadata/records/html/guam_60m_bpistructures.html
2695