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This dataset displays the possible error in the bathymetry measurements,
in meters, around Ofu and Olosega Islands. It is calculated as (Sonar
depth - satellite imagery derived depth). The spatial extent is the area
of overlap between the two measurement types.
{Abstract from "Shelf Bathymetry, Ofu and Olosega Islands
(American Samoa)" dataset}
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 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.
Data Provided By:
NOAA PIFSC CRED, the Pacific Islands Benthic Habitat Mapping Center and 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.