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
10m grid data
2m WV-2 derived depths data files
5m WV-2 derived depths, and multibeam from NOAA Ship Hi'ialakai & R/V AHI data files

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

American Samoa: Swains Island

[ Bathymetry | Backscatter | Optical Validation | Geomorphology ]

Gridded Geomorphology

Download 40 meter grid:
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.

This map includes both the Simrad em3002d and Reson 8101 substrate data sets.
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Hard vs. Soft substrate classification data files

GeoTIFFs derived separately from Simrad em3002d and Reson 8101 backscatter:

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Slope - 40 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 Swains slope.

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Slope data files
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Rugosity - 40 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 Swains rugosity.

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Rugosity data files
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BPI Structures - 40 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 Swains BPI Structures.

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BPI Structures data files
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BPI Zones - 40 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 Swains BPI Zones.

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BPI Zones data files
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