Ni‘ihau: Geomorphology

[ Bathymetry | Backscatter | Optical Validation | Geomorphology ]
Download 5 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(Multibeam), Hard bottom vs. Soft bottom – 5 meter grid

Substrate(Multibeam): Preliminary hard and soft bottom seafloor substrate map derived from an unsupervised classification of gridded backscatter and bathymetry derivatives of Ni’ihau Island, Hawaii, USA.

Image map of Guam substrate.
Download this image as a high-res JPG or PDF

Hard vs. Soft Substrate (Multibeam) classification data files

Substrate(World View-2), Hard bottom vs. Soft bottom – 5 meter grid

Substrate(World View-2): Preliminary hard and soft bottom seafloor substrate map derived from an supervised classification of bathymetry derived from multispectral World View-2 satellite imagery of Ni’ihau Island,  Territory of Main Hawaiian Islands, USA

Image map of Guam substrate.
Download this image as a high-res JPG or PDF

Hard vs. Soft Substrate (World View-2) classification data files

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 Nii Slope.

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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 Nii rugosity.

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Rugosity data files

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 Nii BPI Structures.

Download this image as a high-res JPG or PDF

BPI Structures data files

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 Nii BPI Zones.

Download this image as a high-res JPG or PDF

BPI Zones data files
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