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).
* Ikonos imagery & USGS Digital Ortho Quarter Quads NOT included with download.

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

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).

5m grid data

Main Hawaiian Islands: Ni‘ihau

[ Bathymetry | Backscatter | Optical Validation | Geomorphology ]

Gridded Geomorphology

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(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.
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Hard vs. Soft Substrate (Multibeam) classification data files
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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.
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Hard vs. Soft Substrate (World View-2) 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 Guam 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 Nii 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 Nii 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 Nii 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 Nii BPI Zones.

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BPI Zones data files
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