Benthic Habitat Data

5m grid data

Backscatter Imagery

Optical Validation

Zipped data files contain 1) Arc ASCII file, 2) layer (.lyr) file for symbology, 3) high-res JPG of image, and 4) explanatory metadata text file (identical to linked file listed below).

5m grid data files

CNMI-Guam: Galvez Bank & Eleven Mile Bank

[ Bathymetry | Backscatter | Optical Validation | Geomorphology ]

Gridded Geomorphology

Download 5 meter grid:
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 of image, and 4) explanatory metadata text file (identical to linked file listed below).

5 Meter Grids

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 Guam slope.

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Slope data files
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Rugosity - 5 meter grid

Rugosity: Cell values reflect the surface area and (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 Guam rugosity.

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Rugosity data files
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BPI Structures - 5 meter grid

BPI Structures: Derived from two scales of BPI, slope and depth. Broad and fine-scalefactors of BPI used were 150 and 30 for Galvez Bank and South Galvez Bank, and 150 and 50 for Eleven-mile Bank. Three ranges of slope defined flats, slopes and near vertical: x < 5; 5 < x < 70. Depth alone, in this case, is added only to separate flat structures into shelf (<30 m) and broad flat (>30 m) environments (depths based on SCUBA limits).

Figure giving visual description of BPI Structure classes.

A visual description of BPI Structure classes (Click image for larger view.)

Image map of guam BPI Structures.

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BPI Structures data files
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BPI Zones - 5 meter grid

BPI Zones: BPI Zones: Derived from a broad scale (150) BPI grid and slope. Two ranges of slope defined flats and slopes: x < 5 and 5 < x < 70.

Image map of guam BPI Zones.

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BPI Zones data files
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