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
Slope grid derived from gridded bathymetry of Johnston Island,
Pacific Remote Island Areas, Central Pacific.
raster digital data
http://www.soest.hawaii.edu/pibhmc
http://www.soest.hawaii.edu/pibhmc/cms/data-by-location/pacific-remote-island-area/johnston-atoll/johnston-atoll-geomorphology/
Slope is derived from gridded (20 m cell size) multibeam
bathymetry, collected aboard R/V AHI, and NOAA ship Hi'ialakai.
Cell values reflect the maximum rate of change (in degrees) in
elevation between neighboring cells derived with the ArcGIS
Spatial Analyst extension. This data set is for Johnston Island,
Pacific Remote Island Areas, Central Pacific.
The data were derived in support of NOAA Coral Reef Conservation
Program goals. Goal one is to map all U.S. Coral Reef Ecosystems.
This data set specifically addresses Objective one and four: 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 - 150m) benthic habitats for different
organisms that inhabit coral reef ecosystems.
Gridded multibeam data were 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 and the 218' NOAA Ship Hi'ialakai. The process for deriving the
gridded (20 m cell size) multibeam data is described in Johnston_20m.asc.txt.
The resulting grid (Johnston_20m.grd) was used in the slope calculation.
Slope was calculated using the slope tool in ESRI ArcGIS Spatial Analyst.
20060118
20060123
ground condition
As needed
-169.695161
-169.270155
16.883695
16.572806
NCEI Geoportal FilterCoRIS_MetadataCRCP ProjectBenthic Habitat Mapping and Characterization - American Samoa and the U.S. Pacific Remote Island Area1084
ISO 19115 Topic Category
imageryBaseMapsEarthCover
010
CoRIS Discovery Thesaurus
Geographic Information > Habitats
CoRIS Theme Thesaurus
EARTH SCIENCE > Biosphere > Aquatic Habitat > Reef Habitat > Description
EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Bathymetry
EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Slope
CoRIS Place Thesaurus
OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Johnston Atoll > Johnston Atoll (16N169W0001)
COUNTRY/TERRITORY > United States of America > USA Minor Outlying Islands > Johnston Atoll (16N169W0001)
CoRIS Region
PRIA
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, and the Joint Institute for Marine
and Atmospheric Research (JIMAR) and School of Ocean and Earth
Science and Technology (SOEST), 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
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/PRIAs_images/Johnston_20m_Slope_445.jpg
Gridded Bathymetry Derivative
JPEG
NOAA PIFSC CRED and the Pacific Islands Benthic Habitat
Mapping Center, JIMAR and SOEST
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
The Spatial Analyst extension was used in ArcMap 9.3 to derive
slope from the gridded (20m) bathymetry.
Spatial Analyst --> Surface Analysis --> Slope
using the following parameters:
Input surface: Johnston_20m; Output measurement: Degree; Z factor: 1; Output cell size: 20
20100701
Raster
Grid Cell
2253
1703
1
Universal Transverse Mercator
2
0.9996
-177
0
500000
10000000
Row and Column
20
20
meters
D_WGS_1984
WGS_1984
6378137.000000
298.257224
none
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
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/pria/benthichabitatlayers/Johnston_20m_Slope.rar
None
20190605
20101207
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
20101207024214
None
20060118
20060123
https://www.coris.noaa.gov/metadata/records/html/johnston_20m_slope.html
6069