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.

Bathy 1m grid data
Side-Scan 1m grid data

CNMI-Guam: Apra Harbor

[ Bathymetry | Side-Scan | Optical Validation | Geomorphology ]

Gridded Geomorphology

Download 1 meter grid:
Slope, Rugosity

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).

Substrate, Hard bottom vs. Soft bottom - 5 meter grid

Substrate : This is a preliminary product classified from sidescan and multibeam
bathymetry data.  Cell values reflect whether the seafloor is hard or
soft.  Please see the metadata for additional information.

Image map of Apra substrate.

Download this image as a high-res JPG or PDF

Hard vs. Soft substrate classification data files

GeoTIFFs

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Slope - 1 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 Apra slope.

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Slope data files
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Rugosity - 1 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 Apra rugosity.

Download this image as a high-res JPG or PDF

Rugosity data files
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