This paper describes a method to produce a relative digital elevation model (DEM) from SPOT level 1A stereo pair or triplet images without the use of ground control points. The proposed method consists of 1. stereo matching by correlation, 2. calculation of the intersection point of pair or triplet viewing lines and 3. interpolation from random DEM to grid DEM. The emphasis is laid on how to restrict a search area for stereo matching using approximate epipolar constraint.