Image Name                   :  dmx97ns 
Boundaries                   :  Lat 14N to 33N ; Lon 241E to 285E
Color Scale, Upper (Red)     :  16 arcseconds and higher
Color Scale, Lower (Magenta) : -16 arcseconds and lower 
Data Max value               :  37.0 arcseconds
Data Min value               : -37.5 arcseconds
Illuminated from the         :  North

  This is an image generated from 2'x2' N/S surface deflections of the
vertical covering Mexico and surrounding areas.  Some interesting 
features to note about this image are:

  The mixture of purple (lows) and red (highs) through the western and
lower central 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 and Sierra Madre Mountains.

  The series of highs and lows between the Yucatan peninsula and Jamaica
and Cuba are signals induced by the bathymetry of the region.  The longest
signal runs from Belize to Cuba and is induced by the Cayman trench
(the deepest trench in the Caribbean -- 24,720 feet deep)

  The large negative signals (magenta) off the west coast of Mexico are 
induced by the Middle American trench.

  Off of the north coast of the Yucatan Peninsula is a large positive
(orange) signal being caused 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 4/14/97