Image Name                   :  d96useta
Boundaries                   :  Lat 24N to 53N ; Lon 230E to 294E
Color Scale, Upper (Red)     :  16 arcseconds and higher
Color Scale, Lower (Magenta) : -16 arcseconds and lower 
Data Max value               :  42.3 arcseconds
Data Min value               : -34.6 arcseconds
Illuminated from the         :  East 

  This is an image generated from 2'x2' E/W surface deflections of the
vertical covering the conterminous United States and surrounding areas.
Some interesting features to note about this image are:

  The mixture of purple (lows) and red (highs) through the western portion
of the image is created by high-frequency geoid changes that are occurring
in relation to similar high-frequency terrain changes throughout the 
Rocky Mountains.

  The large N/S signal running through Minnesota/Iowa are the 
deflections induced by the mid-continent gravity high.  Gravity vectors
East and West of this area will both point toward the area and therefore
yield positive deflections to the East and negative deflections to the West.

  The large positive signals (orange) off of the East coast are
deflections induced by the edge of the continental shelf.

  Large bumps in the Pacific Ocean areas are the effect of sea mounts on the
deflections of the vertical.

das/dgm 10/18/96