Benthic Habitat Data

Bathymetry

Zipped data files contain 1) grid data file (GMT or ASCII), 2) high-res JPG of image, and 3) explanatory metadata text file (identical to linked file listed below).

40m grid data
5m grid data
Merged Multibeam Bathymetry, IKONOS Derived Depths

Not yet available

Zipped data files contain 1) Arc ASCII file, 2) layer (.lyr) file for symbology, 3) high-res JPG/PDF of image, and 4) explanatory metadata text file (identical to linked file listed below).

40m grid data
5m grid data

American Samoa: Rose Atoll

[ Bathymetry | Backscatter | Optical Validation | Geomorphology ]

Gridded Geomorphology

Download 40 meter grid:
Substrate
Download 5 meter grid:
Substrate, Int. Substrate, Slope, Rugosity, BPI Structures, BPI Zones

Click here for a Discussion of Geomorphological Layers

Zipped data files contain 1) Arc ASCII file, 2) layer (.lyr) file for symbology, 3) high-res JPG/PDF of image, and 4) explanatory metadata text file (identical to linked file listed below).

Substrate, Hard bottom vs. Soft bottom - 40 meter grid

Substrate :This is a preliminary product derived from an unsupervised classification of multibeam bathymetric data derivatives and multibeam backscatter data. Cell values reflect whether the seafloor is hard or soft. Please see the metadata for additional information.

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Hard vs. Soft substrate classification data files
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Substrate, Hard bottom vs. Soft bottom - 5 meter grid

Substrate :This is a preliminary product derived from an unsupervised classification of multibeam bathymetric data derivatives and multibeam backscatter data. Cell values reflect whether the seafloor is hard or soft. Please see the metadata for additional information.

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Hard vs. Soft substrate classification data files
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Integrated Substrate, Hard bottom vs. Soft bottom - 5 meter grid

Integrated Substrate : Hard and soft seafloor substrate map, derived from integrating two existing map products: hard and soft substrate maps derived from an unsupervised classification of multibeam backscatter and bathymetry derivatives.

Image map of Rose substrate.

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Integrated Hard vs. Soft Substrate Classification data files
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Slope - 5 meter grid

Slope: Cell values reflect the maximum rate of change (in degrees) in elevation between neighboring cells. Slope was derived with the ArcGIS Spatial Analyst extension.

Image map of Rose slope.

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Slope data files
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Rugosity - 5 meter grid

Rugosity: Cell values reflect the surface area / planimetric area ratio for the area contained within that cell’s boundaries. They provide indices of topographic roughness and convolutedness. (Jenness 2003)

Image map of Rose rugosity.

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Rugosity data files
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BPI Structures - 5 meter grid

BPI Structures: Derived from two scales (30 & 200) of BPI; slope; and depth. Three ranges of slope defined flats, slopes and near vertical: x < 5; 5 < x < 70.

Figure giving visual description of BPI Structure classes.

A visual description of BPI Structure classes (Click image for larger view.)

Image map of Rose BPI Structures.

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BPI Structures data files
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BPI Zones - 5 meter grid

BPI Zones: Derived from a broad scale (200) BPI grid and slope. Two ranges of slope defined flats and slopes: x < 5 and 5 < x < 70.

Image map of Rose BPI Zones.

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BPI Zones data files
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