Farallon de Medinilla: Geomorphology

[ Bathymetry | Backscatter | Optical Validation | Geomorphology ]
Slope, Rugosity, BPI Structures, BPI Zones

Click here for a Discussion of Geomorphological Layers

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 (25 & 200) of BPI; slope; and depth. 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: 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 guam BPI Zones.

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BPI Zones data files
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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 grid data

Not yet available

Not yet available

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