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301-713-3028
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1305 East West Highway, N-SCI-1, SSMC 4
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Silver Spring
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Maryland
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Principal Component Surface (2011) for St. Thomas East End Reserve, St. Thomas
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2013-11-30
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https://www.coris.noaa.gov/metadata/records/ISO/html/pca3_steer_resample_p3m_iso.html
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Silver Spring
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Maryland
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This image represents a 0.3x0.3 meter principal component analysis (PCA) surface for areas the St. Thomas East
End Reserve (STEER) in the U.S. Virgin Islands (USVI). It was created by integrating eight topographic
complexity surfaces (mean depth, standard deviation of depth, curvature, plan curvature, profile curvature,
rugosity, slope, and slope of slope). The eight complexity surfaces were rendered, stacked and exported to
create one image with several different bands (each band representing a specific complexity surface). This
stacked image was transformed into its first three principal components using the "Principal Components
Analysis" function in ENVI 5.0. The transformation reduced the dimensionality of the dataset by removing
information that correlated among the different bands (i.e., complexity surfaces). The resulting PCA GeoTIFF
was created to aid in the classification of benthic habitat inside the STEER.The original bathymetric
surface used to derive the tographic complexity surfaces and PCA was collected by Fugro LADS and funded by
the National Oceanic & Atmospheric Administration (NOAA). Bathymetry and reflectivity data were acquired
between 1/29/2011 - 2/28/2011using a LADS (Laser Airborne Depth Sounder) Mark II Airborne System from
altitudes between 1,200 and 2,200ft at ground speeds between 140 and 175 knots. The 900 Hertz Nd: YAG
(neodymium-doped yttrium aluminum garnet) laser (1064 nm) acquired 3x3 meter spot spacing and 200% seabed
coverage. Depths between 3 and 40 m were surveyed, producing a 3x3 m bathymetry and 3x3 m reflectivity
surface. These surfaces were resampled to 0.3x0.3 m to match the spatial resolution of the orthophoto
mosaic. Environmental factors such as wind strength and direction, cloud cover, water clarity and depth
influenced the area of data acquisition on a daily basis. The data was processed using the LADS Mark II
Ground System and data visualization, quality control and final products were created using CARIS HIPS and
SIPS and CARIS BASE Editor. All users should individually evaluate the suitability of this data according to
their own needs and standards.
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This principal component surface was created by NOAA to support the characterization of seafloor features in,
and creation of a benthic habitat map for, the St. Thomas East End Reserve (STEER) in the U.S. Virgin
Islands (USVI). Habitat maps provide a spatially explicit representation of benthic structure and biological
cover. The spatial products developed for this project will: (1) inform local managers as to the current
distribution of resources, (2) provide a point of comparison for past and future mapping efforts, (3) help
locate sensitive marine communities, and (4) guide monitoring efforts and prioritize management actions.
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Please cite the National Oceanic & Atmospheric Administration (NOAA), National Centers for Coastal Ocean
Science (NCCOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Branch (BB) in any use of
this data.
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301-713-3028
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301-713.4384
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1305 East West Highway, N-SCI-1, SSMC 4
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Silver Spring
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Maryland
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20910
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Biogeography Branch (BB) in any use of this data.
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Biogeography Branch (BB) in any use of this data.
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National Oceanic & Atmospheric Administration, National Centers For Coastal and Ocean Science, Center
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301-713-3028
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301-713.4384
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1305 East West Highway, N-SCI-1, SSMC 4
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Silver Spring
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Maryland
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20910
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NOT TO BE USED FOR NAVIGATION. Please cite the National Oceanic & Atmospheric Administration (NOAA),
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Biogeography Branch (BB) in any use of this data.
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