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In most geological applications of Earth Obervation (EO) data over mountainous regions little attention is given to orthorectification, mainly because of the large spatial errors that can be tolerated (often many times the original pixel size). In most times a least-squares polynomial fit serves the purpose of image georeferencing. In this paper two procedures for optical EO data orthorectification are presented which differ on the extraction of the Digital Elevation Model (DEM). The proceduresdoi:10.1080/10106040008542153 fatcat:2n46bzzxhva2fog5w27624u5lu