Abstract
Digital elevation models (DEMs) can be generate by interferometric SAR (InSAR) and radargrammetry techniques from different acquisition of Synthetic Aperture Radar (SAR) images. Radar imaging systems record both the phase and intensity information of the backscattered signals from ground. InSAR utilizes the phase information of the images to extract useful geodetic information, such as the height of terrain, ground deformation and movement. However, InSAR technique is constrained by the temporal and spatial baselines between the images used, as well as the various atmospheric conditions at the time of acquisitions. In comparison, radargrammetry technique uses the intensity (power) information in a stereo-pair of radar images. It is similar to stereo-grammetry or photogrammetry which is a classic method for relief reconstruction using airborne/spaceborne optical imageries. In this paper, the radargrammetric DEM quality improvement method using SAR image processing is presented by ENVISAT/ASAR imageries.
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