Abstract:

In recent years, the Synthetic Aperture Radar Interferometry (InSAR) is widely applied and it provides reliable results for determining Digital Elevation Model, and vertical and horizontal land deformation. All these applications are based on the analysis of the phase difference between two pairs of Radar interferometry. To determine the surface deformation, we can use 2 or 3 photo images to form two pairs of interference, including a pair for determining interference topography while the another pair for determining interferometer containing topography and topography deformation. Topography deformation will be determined by removing the interference pattern topography or minimized to the extent not substantially interfering in the pair contains deformation. This paper introduces InSAR technique in determining surface subsidence and experimental result in Hanoi city with TeraSAR-X images has identified areas of North Thang Long Industrial subsidence (-41mm/ year) during the period 2012 to 2013.