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)
20081215
Bathymetric Position Index (BPI) Structures 10 m grid derived from gridded
bathymetry of Asuncion Island, Commonwealth of the Northern Mariana
Islands (CNMI), USA.
raster digital data
http://www.soest.hawaii.edu/pibhmc/pibhmc_cnmi_asu_geomorph.htm
BPI Structures are derived from two scales of a focal mean
analysis on bathymetry and slope. The grid is based on
gridded (10 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 14 classes in an index of seafloor terrains. This
data set is for the shelf and slope environments of Asuncion Island. As
part of the northern islands of the Mariana Islands archipelago,
Asuncion's offshore terrain has a shelf (above -60m) and a deep shelf
(below -60m) that are both present off the southwest side of the island.
Conversely, the southern islands each have a shelf (above -100m) with
escarpments that lead to broad flat areas without forming a deeper shelf.
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 depth (~20m to 800m)
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, asuncion_10m.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.
20070525
20070608
ground condition
As needed
145.362
145.437
19.727
19.642
NCEI Geoportal FilterCoRIS_Metadata
CRCP Project
Benthic Habitat Mapping and Characterization - Commonwealth of the Northern Mariana Islands and Guam
1398
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
Asuncion Island
Commonwealth of the Northern Mariana Islands
United State of America
CoRIS Place Thesaurus
COUNTRY/TERRITORY > Northern Mariana Islands > Asuncion Island > Asuncion Island (19N145E0001)
OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Asuncion Island > Asuncion Island (19N145E0001)
CoRIS Region
CNMI
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/asuncion_10m_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 (asuncion_10m) 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 (50 & 250) were chosen for Asuncion Island. Two fine
scale factors (20 and 50) and two broad scale factors (250 and 500)
were tested after measuring many of the bathymetric features that
indicate possible reef structures when overlaid on the hillshade
(also after Lundblad et al. 2006; see Supplemental_Information).
Four combinations of scale factors were created and used in the
Terrain Classification Builder (part of the BTM) to create multiple
structure and zone grids. Compared to the combinations using a broad
scale factor of 500, those using 250 highlight more fine scale structures,
including the broad crests, which are very important in coral reef
environments. The fine scale factor of 50 defined the fine scale
structures as more continuous features and cancelled out a lot of the
noise that was falsely defined by using 20 or 30. Additionally, three
ranges of slope define flats, slopes, and near vertical: x < 5;
5 < x < 70; x > 70. Depth bounds separated flat structures into shelf
(0 to -60m) and deep shelf (-60 to -1000m) environments. The depths were
based on the bathymetric drop off on the SW end of the island.
20081203
Raster
Grid Cell
932
783
1
Universal Transverse Mercator
55
0.9996
147
0
500000
0
Row and Column
10
10
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).
ftp://ftp.soest.hawaii.edu/pibhmc/website/data/cnmi-guam/benthichabitatlayers/asuncion_10m_BPIstructures.zip
None
20200329
20090916
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
20090916071936
None
20070525
20070608
https://www.coris.noaa.gov/metadata/records/html/asuncion_10m_bpistructures.html
4085