NWHI - Necker Island

Necker Island is all that remains of an estimated 10 million-year-old shield volcano. Geologists believe that the portion of the volcano above water was once as large as the current size of the island of O'ahu. Now, the highest point on Necker is about 112 m above sea level. Wave erosion has reduced the volcano to a submerged shelf about 65 km long in a NW-SE direction and about 24 km wide. Necker Island itself is about 1.1 km long and less than 0.3 km wide, with steep sea cliffs on all sides.

Maps and Imagery


Download shapefiles which correspond to the detailed habitat class and aggregated cover imagery. Each zipped shapefile consists of 6 separate files, with the same root name and .dbf, .prj, .sbn, .sbx, .shp, and .shx extensions.

Assisted Files and Data