Hogrefe Natural Systems Analysis in collaboration with
Davey Jones Locker GIS Laboratory, Oregon State Universtiy for
Coral Reef Ecosystem Division, NOAA Pacific Islands Fisheries
Science Center, Pacific Islands Benthic Habitat Mapping Center
20090123
Mosaic of 5 m gridded multibeam bathymetry and bathymetry derived
from multispectral IKONOS satellite imagery of Asuncion Island,
Commonwealth of the Northern Marianas Islands, USA
raster digital data
http://www.soest.hawaii.edu/pibhmc/pibhmc_cnmi_asu_bathy.htm
Gridded multibeam bathymetry is integrated with bathymetry
derived from multpectral IKONOS satellite data. Gridded (5 m cell
size) multibeam bathymetry collected aboard NOAA Ship Hiialaka'i and
R/V AHI. Bathymetry values shallower than 15 m were derived by
gauging the relative attenuation of blue and green spectral radiance
as a function of depth. A multiple linear regression analysis of
linearized blue and green band spectral values against depth determined
the variables of y-intercept, blue slope and green slope values.
Variables then used in multivariate slope intercept formula to derive
depth. Variables were adjusted to improve the statistical accuracy and
spatial coverage of the final derived bathymetry product. Digital image
processing to derive depths conducted with the ENVI 4.5 software program
while data editing and integration was performed using ArcGIS 9.3. This
dataset is for the shelf environment of Asuncion Island, Commonwealth of
the Northern Marianas Islands, USA
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 integration of derived
bathymetry with multibeam sonar data provides a GIS layer with
expanded spatial coverage that may be used for benthic and essential
fish habitat characterization, and for the study of geologic features.
By combining the dataset with other bathymetry, backscatter, derivatives,
and in situ data, they collectively compose benthic habitat maps
designed to be used to understand and predict shallow depth (0m to 150m)
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,
Asuncion_5m.txt.
http://www.soest.hawaii.edu/pibhmc/pibhmc_cnmi_asu.htm
Original IKONOS imagery was purchased to support the Pacific Islands
Geographic Information System (GIS) project and National Ocean Service's
(NOS) coral mapping activities. Orthographically corrected IKONOS Imagery
was provided by NOAA's National Centers for Coastal Ocean Science, Center
for Coastal Monitoring and Assessment. The metadata for this IKONOS
imagery is documented in the original product metadata, po_107144_metadata
(http://www.soest.hawaii.edu/pibhmc/)
20030403
20070608
ground condition
As needed
145.366525
145.430229
19.718796
19.646644
CoRIS Theme Thesaurus
EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Bathymetry
EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Water Depth
EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Remote Sensing > Satellite (digital scans) > IKONOS
None
Slope
Bathymetry
Multibeam sonar
ISO 19115 Topic Category
elevation
006
CoRIS Discovery Thesaurus
Geographic Information > Bathymetry
None
Asuncion Island
Commonwealth of the Northern Marianas Islands
United States of America
CoRIS Place Thesaurus
OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Asuncion Island > Asuncion Island (19N145E0001)
COUNTRY/TERRITORY > Northern Mariana Islands > Asuncion Island > Asuncion Island (19N145E0001)
CoRIS Region
CNMI
None
These data are not to be used for navigation
purposes. Please acknowledge NOAA Pacific Islands Fisheries
Science Center, the Joint Institute for Marine and
Atmospheric Research (JIMAR) University of Hawaii and Davey
Jones Locker GIS Laboratory Oregon State University as the
sources of this information.
http://www.soest.hawaii.edu/pibhmc/CNMI_images/asu_bathymetry_mb&IKONOS_5m_445.jpg
Gridded Bathymetry
jpeg
NOAA PIFSC CRED, the Pacific Islands Benthic Habitat
Mapping Center and Davey Jones Locker GIS Laboratory
Oregon State University
Not applicable
Unclassified
Not applicable
ArcGIS ASCII file or ArcGIS Grid file,
bathymetry derived from 4x4m multispectral satellite imagery (IKONOS)
using ENVI 4.5, multibeam and derived bathymetry were integrated using
ArcGIS 9.3
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 sonar product: ~ 1% of water depth
Vertical accuracy of derived bathymetry product: 5 meter range
Multiple tools in ENVI 4.5 were used to complete the following
processing steps: Data conversion from digital number to radiance,
correction for atmosphere and water surface reflection,
linearization of spectral decay as function of depth, masking of
non-applicable values, and bathymetric derivation using variables
from multiple linear regression analysis. Multiple tools in
ArcGIS 9.3 were used for dataset integration and to extract values
for the multiple linear regression analysis and subsequent error
analyses. The statisitcs program S-Plus was used for the multiple
linear regression analysis to provide original variables for depth
derivation. The multivariate slope intercept formula used to
derive depth was Depth=Yint+(Mblue)(Xblue)+(Mgreen)(Xgreen). Two
derived products from the image asuncion_107144_msi_rat.pix (Asu144),
were integrated to enhance statistical accuracy and expand spatial
coverage. The original MLR variables for Asu144 were Yint=-12.6994,
Mblue=-8.1453, and Mgreen=10.8586. Two additional products were
derived to enhance accuracy and expand coverage. The first
(Asu144_5m_DB9) was derived using increased linearized blue and green
band slope values of -16.1453 and 18.8586 to increase statistical
accuracy. The second (Asu144_5m_DB11) was derived using a increased
slope value of -8.6994 with the original linearized blue and green
band slope values. Data from Asu144_5m_DB9 replaced concurrent data
from Asu144_5m_DB11 during integration due to better statistical
accuracy.
The derived bathymetry mosaic was (Asu_DBall_mos) was then integrated
with the multibeam sonar data 5m grid, with sonar data prioritized over
derived data, to create the final product (Asu_5m_DBMB).
A detailed description of all processing steps is available at:
http://oregonstate.edu/~hogrefek/Cookbook/Cookbook_042108.pdf
An error analysis of each derived bathymetry grid used is available
upon request.
20090121
Raster
Pixel
1585
1321
1
Universal Transverse Mercator
55
0.999600
147.000000
0.000000
500000.000000
0.000000
Row and Column
5.000000
5.000000
meters
D_WGS_1984
WGS_1984
6378137.000000
298.257224
NOAA PIFSC CRED PIBHMC and DJLab OSU
Kyle Hogrefe
mailing and physical address
104 Wilkinson Hall, Oregon State University
Corvallis
Oregon
97331
USA
541-737-2397
hogrefek@geo.oregonstate.edu
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 Grid
Arc Grid can be opened directly using
ArcMap or ArcCatalog.
http://www.soest.hawaii.edu/pibhmc/pibhmc_cnmi_asu_bathy.htm
None
20151017
20091222
Kyle Hogrefe
NOAA PIFSC CRED PIBHMC and DJLab OSU
mailing and physical address
104 Wilkinson Hall, Oregon State University
Corvallis
Oregon
97331
USA
541-740-8444
hogrefek@geo.oregonstate.edu
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
Universal Time
None
None
20091222063406
None
20030403
20070608
http://www.coris.noaa.gov/metadata/records/html/asu_5m_dbmb_metadata.html
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