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)
20080830
Rugosity 10 m grid derived from gridded bathymetry of Alamagan Island,
Commonwealth of the Northern Mariana Islands (CNMI), USA
raster digital data
http://www.soest.hawaii.edu/pibhmc/pibhmc_cnmi_ala_geomorph.htm
Rugosity is derived from gridded (10 m cell size)
multibeam bathymetry, collected aboard NOAA Ship Hi'ialakai and
R/V AHI, using the Benthic Terrain Modeler with rugosity methods by
Jeff Jenness (2003). Cell values reflect the surface area to
planimetric area ratio for the area contained within that cell's
neighborhood. They provide indices of topographic roughness &
convolutedness. This data set is for the shelf and slope environment
of Alamagan Island.
The data were derived in support of NOAA 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 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,
alamagan_10m.txt. (http://www.soest.hawaii.edu/pibhmc/pibhmc_cnmi_bathy.htm)
References:
Jenness, J. 2003. Grid surface areas: Surface area and ratios from
elevation grids [Electronic manual]. Jenness Enterprises:
ArcView Extensions.
http://www.jennessent.com/arcview/arcview_extensions.htm
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/
CNMI and Guam rugosity maps are all symbolized with the same
stretched color ramp (1.5 standard deviations) in order to provide a
standard for qualitative comparisons between islands. Each island has
a unique maximum value for rugosity causing the distribution of values
across the color ramp to vary slightly. It is recommended that
the actual data set be used for integrated analysis in order to make
quantitative observations. The values for this data set range from
1.000 to 9.304 with a mean of 1.142 and a standard deviation of 0.258.
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
145.788
145.875
17.667
17.555
NCEI Geoportal FilterCoRIS_MetadataCRCP ProjectBenthic Habitat Mapping and Characterization - Commonwealth of the Northern Mariana Islands and Guam1398
CoRIS Discovery Thesaurus
Geographic Information > Habitats
ISO 19115 Topic Category
imageryBaseMapsEarthCover
010
CoRIS Theme Thesaurus
EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Rugosity
None
Rugosity
Bathymetry
Multibeam sonar
None
Alamagan Island
Commonwealth of the Northern Mariana Islands
United States of America
CoRIS Region
CNMI
CoRIS Place Thesaurus
COUNTRY/TERRITORY > Northern Mariana Islands > Alamagan Island > Alamagan Island (17N145E0002)
OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Alamagan Island > Alamagan Island (17N145E0002)
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/alamagan_10m_rugosity_445.jpg
Gridded Bathymetry
JPEG
NOAA PIFSC CRED PIBHMC and JIMAR
Not applicable
Unclassified
Not applicable
ArcGIS ASCII file, derived from bathymetry in
ArcGIS 9.3, Spatial Analyst
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
Rugosity was derived from the gridded multibeam bathymetry
(alamagan_10m) using the Benthic Terrain Modeler (BTM). The BTM may
be downloaded from http://www.csc.noaa.gov/products/btm/. The BTM,
written for ArcGIS 8.x or 9.x, includes a component for deriving
rugosity using methods by Jeff Jenness as he wrote for ArcView 3.x.
20090219
Raster
Grid Cell
1215
879
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)
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/alamagan_10m_rug.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
20090916071532
None
20070525
20070608
https://www.coris.noaa.gov/metadata/records/html/alamagan_10m_rug.html
4083