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Bathymetric data derived from two multipectral IKONOS satellite images
are mosaiced to provide near complete coverage of nearshore terrain
around the islands. Bathymetry values shallower than 25 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 4.3 software program
while data editing and integration was performed using ArcGIS 9.3. This
data set is for the shelf environment of Ofu and Olosega Islands,
American Samoa.
Depth is displayed in meters (m).
Data Provided By:
Hogrefe Natural Systems Analysis in collaboration with Davey Jones Locker GIS Laboratory, Oregon State University
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.
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The Conservation Biology Institute (CBI) provides scientific expertise to support the conservation and recovery of biological diversity in its natural state through applied research, education, planning, and community service.