Pearl and Hermes Atoll: Geomorphology

[ Bathymetry | Backscatter | Optical Validation | Geomorphology ]
Download 5 meter grid:
Slope, Rugosity, BPI Structures, BPI Zones

Zipped data files contain 1) Arc ASCII or GeoTIFF 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).

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 PHR.

Download this image as a high-res JPG or PDF

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 PHR.

Download this image as a high-res JPG or PDF

Rugosity data files

BPI Structures – 5 meter grid

BPI Structures: Derived from two scales (20 & 250) 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 PHR 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 (250) BPI grid and slope. Two ranges of slope defined flats and slopes: x < 5 and 5 < x < 70.

Image map of PHR BPI Zones.

Download this image as a high-res JPG or PDF

BPI Zones data files
Top of the page

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).

20m grid data
5m grid data

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