Lateral Ground Movement Estimation from Space borne Radar by Differential Interferometry

Synthetic Aperture Radar (SAR) Interferometry (InSAR) is a powerful and exciting technique that has gained eminence in the last 10 years after the advances in Satellite imaging systems. Interferometry is a phase-based technique which uses a coherent imaging system to extract topographical information from image pairs. This paper will demonstrate the possibility of extracting lateral ground displacement with InSAR. Movement derived from one look direction (subsidence only) will contain errors, if it is incorrectly assumed that the other two components (East-West and North-South) are zero. The suggested technique can be used to improve the accuracy of single-pair subsidence estimates by fusing two non-parallel pass images and measuring the lateral movement.