Necker Island: Optical Validation

[ Bathymetry | Backscatter | Optical Validation | Geomorphology ]

The collection and analysis of photographic data to ground truth and interpret multibeam data layers with the goal of characterizing seafloor habitats.

Coral Cover Map

TOAD map for Necker Island.
Click thumbnail map to view a high-resolution JPG.   Download: High-res JPGPDF


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 Necker Island in 2001, 2002, 2003 and 2004. 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.)