Image Name : ww15mgh
Boundaries : Lat -90N to 90N ;
Lon 0E to 360E
Color Scale, Upper (Red) : 85.4 meters and higher
Color Scale, Lower (Magenta) :-107.0 meters and lower
Data Max value : 85.4 meters
Data Min value :-107.0 meters
Illuminated from the : East
This is an image generated from 15'x15' geoid undulations covering the planet Earth. These undulations represent the NIMA/GSFC WGS-84 EGM96 15' Geoid Height File. This file is a global grid of undulations generated from: (a) the EGM96 spherical harmonic coefficients and (b) correction terms that convert pseudo-height anomalies on the ellipsoid to geoid undulations.
This file may be found at: http://188.8.131.52/geospatial/products/GandG/wgs-84/geos.html
The undulations in this file refer to the WGS-84(G873) reference ellipsoid.
We are deeply indebted to the NIMA/GSFC EGM96 team for their work on EGM96 and this grid of associated geoid undulations.
Some interesting features to note about this image are: Even at 15' resolution, some beautiful features of the global geoid are obvious.
Map and description from the National Geodetic Survey.