Kure Atoll: Geomorphology

[ Bathymetry | Backscatter | Optical Validation | Geomorphology ]
Download 5 meter grid:
Slope, Rugosity, BPI Structures, BPI Zones

Zipped data files contain 1) Arc ASCII or GeoTIFF 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).

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 Kure Atoll.

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Slope data files

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 Kure Atoll.

Download this image as a high-res JPG or PDF

Rugosity data files

BPI Structures – 5 meter grid

BPI Structures: Derived from two scales (20 & 250) 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 Kure Atoll BPI Structures.

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BPI Structures data files

BPI Zones – 5 meter grid

BPI Zones: Derived from a broad scale (250) BPI grid and slope. Two ranges of slope defined flats and slopes: x < 5 and 5 < x < 70.

Image map of Kure Atoll BPI Zones.

Download this image as a high-res JPG or PDF

BPI Zones data files
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