Image Name                   :  egm96us
Boundaries                   :  Lat 24N to 53N ; Lon 230E to 294E
Color Scale, Upper (Red)     :  -7.4 meters and higher
Color Scale, Lower (Magenta) : -52.6 meters and lower 
Data Max value               :  -7.4 meters
Data Min value               : -52.6 meters
Illuminated from the         :  East 


  This is an image generated from 2'x2' geoid undulations covering the
conterminous United States and surrounding areas.  These undulations were
generated from the EGM96 spherical harmonic model of the Earth's external
gravitational potential, including a height anomaly to geoid height
correction.  Some interesting features to note about this image are:

  Unlike the GEOID96/DEFLEC96/G96SSS models, the resolution of the EGM96
grid is 30'.  Thus, even though the values are gridded at 2' spacings, 
features smaller than 30' wide are not resolved in the model.

  The geoid high (red) of -7.4 meters is centered over the "Yellowstone
hot spot".  While less detailed than the same high in image g96us, this
feature still shows its broad characteristics.

  Large features of the geoid, such as those induced by Sacramento Valley,
the continental shelf, and the Rocky Mountains are visible.  However, features
that are smaller, such as sea mounts are not seen in this image.  The
mid-continent gravity high (Minnesota to Iowa) is partially represented
due to its narrow structure.

das/dgm 10/18/96