[ 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.
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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
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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.
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Slope data files
- Arc ASCII: Metadata text • Zipped data
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)
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Rugosity data files
- Arc ASCII: Metadata text • Zipped data
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.
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| A visual description of BPI Structure classes (Click image for larger view.) |
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BPI Structures data files
- Arc ASCII: Metadata text • Zipped data
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.
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BPI Zones data files
- Arc ASCII: Metadata text • Zipped data