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
Merged Multibeam Bathymetry, IKONOS Derived Depths

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).

20m grid data files

PRIA: Johnston Atoll

[ Bathymetry | Backscatter | Optical Validation | Geomorphology ]

Backscatter Gridded Data

Johnston Composite Backscatter Imagery

Johnston backscatter composite image.

Download above image as a high-res JPG or high-res PDF

Johnston Color Composite Backscatter Imagery

Johnston backscatter composite image.

Download above image as a high-res JPG or high-res PDF

 

Zipped data files contain 1) grid data file (NetCDF/GMT or GeoTIFF), 2) high-res JPG of image, and 3) explanatory metadata text file (identical to linked file listed below). Study area grids are named for the island location, the type of sensor used for data acquisition, the chart box number, and the grid resolution in meters.

AHI Reson 8101 240 kHz Backscatter Imagery

Johnston AHI Reson 8101 240 kHz Backscatter Imagery.

Download above image with boxes as a high-res JPG or high-res PDF
Download above image without boxes as a high-res JPG or high-res PDF

The boxes on the map represent charts used to grid subsets of the backscatter data into manageable file sizes. The box labels correspond to the charts available for download in the pull down menus. To create a map of the entire backscatter dataset, all charts must be downloaded and the data must be mosaicked.

Reson 1 meter grid: NetCDF grid metadata text | GeoTIFF metadata text

 
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Hi‘ialakai Simrad EM300 30 kHz Backscatter Imagery

Johnston Hiialakai Simrad EM300 30 kHz Backscatter Imagery.

Download above image with boxes as a high-res JPG or high-res PDF
Download above image without boxes as a high-res JPG or high-res PDF

The boxes on the map represent charts used to grid subsets of the backscatter data into manageable file sizes. The box labels correspond to the charts available for download in the pull down menus. To create a map of the entire backscatter dataset, all charts must be downloaded and the data must be mosaicked.

EM300 5 meter grid: NetCDF grid metadata text | GeoTIFF metadata text

 
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Hi‘ialakai Simrad EM3002d 300 kHz Backscatter Imagery

Johnston Hiialakai Simrad EM3002d 300 kHz Backscatter Imagery.

Download above image with boxes as a high-res JPG or high-res PDF
Download above image without boxes as a high-res JPG or high-res PDF

The boxes on the map represent charts used to grid subsets of the backscatter data into manageable file sizes. The box labels correspond to the charts available for download in the pull down menus. To create a map of the entire backscatter dataset, all charts must be downloaded and the data must be mosaicked.

EM3002d 1 meter grid: NetCDF grid metadata text | GeoTIFF metadata text

 
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