{I550,0;λ40;JUFC;W0,1260,0,1900;}
	A 3-D geometric modeling system for application
to computer vision  is described. In computer vision geometric models
provide a  goal  for  descriptive  image analysis,    an  origin  for
verification  image synthesis,   and  a context  for spatial  problem
solving.  Some of the design ideas presented have been implemented in
two programs named GEOMED  and CRE; the programs are  demonstrated in
situations involving camera motion relative to a static world.