A study on Tamilnadu coastal deformation processes using SAR Interferometric data
Author(s)– German Amali Jecintha .T1, V.E. NethajiMariappan2
SAR systems take advantage of the long-range propagation characteristics of radar signal and the complex information processing capability of modern digital electronics to provide high resolution imagery. The paper focuses on the differential interferometric SAR (Synthetic Aperture Radar) technique for the monitoring of terrain surface deformations. A series of ERS (Earth Resources Satellite) 1&2 and ASAR (Advance Synthetic Aperture Radar) images acquired at different dates before and after tsunami were used in this study. Two SAR images are combined to produce a SAR Interferogram to reveal information about the third dimension (elevation) of the object and to measure small displacements of objects between the two image acquisitions. Interferometric processing, the SLC images were accurately co registered and the complex interferograms are formed by multiplying each complex pixel of the first image by the complex conjugate of the same pixel in the second image. Coherence images and interferograms were then derived from pairs of co- registered SLC images. The interferogram thus generated is a complex image itself. A careful observation of the images reveals that closer are the fringes, more are the topographical changes or height variations which represents the main observation for the estimation of the coastal deformations processes.