High resolution and accurate Digital Elevation Model (DEM) generation from satellite imagery is a challenging problem. In this work, a stereo 3-d reconstruction framework is outlined that is applicable to non-stereoscopic satellite image pairs that may be captured by different satellites. The orthographic height maps given by stereo reconstruction are compared to height maps given by a multiview approach based on probabilistic volumetric representation (PVR). Height map qualities are measured in comparison to manually prepared ground-truth height maps in 3 sites from different parts of the world with urban, semi-urban and rural features. The results along with strengths and weaknesses of the two techniques are summarized.