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High-altitude Himalayan terrain exhibits extreme geometric distortion along north-facing (dilation) and south-facing (compression) slopes as observed in satellite stereo data with high look angles. In the present study, Cartosat-1 stereo pairs have been used for generating Digital Elevation Model (DEM) using Differential Global Positioning System based Ground Control Points. DEM quality assessment through stereoscopic visualization revealed distortions especially in E-W oriented steep valleys. The study highlights issues and challenges in DEM generation for Himalayan terrain and articulates density of editing required. Quantitative and qualitative assessment of the DEM produced showed considerable improvements after post processing.

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