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.
Zipped data files contain 1) Arc ASCII 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).
The collection and analysis of photographic data to ground truth and interpret multibeam data layers with the goal of characterizing seafloor habitats.
Descriptions of optical data products.
Download: Accessory Files
The map above shows percent cover values of scleractinian coral derived from classified photos and videos collected at Ni‘ihau in 2005. Each point represents an analyzed video frame or photo. Note that the percent classes are unevenly sized to better display this relatively low-abundance bottom type.
The optical data are classified by substrate type, type of live growth on bottom, geomorphic zone, and the size and abundance of holes in the substrate. Although what we show here is the percentage of coral, the shapefiles contain data on all those categories, enabling users to map the occurrence of any combination of characteristics that are included in the classification scheme. (See sidebar for shapefiles.)