DERIVATION OF VELOCITY OF THE POTSDAM GLACIER, EAST ANTARCTICA USING SAR INTERFEROMETRY

摘要

The Synthetic Aperture Radar Interferometry (InSAR) is a robust method for monitoring Earth's surface mainly to measure its topography and deformation. It is a widely used technique in multidisciplinary applications. By using two SAR images interferogram was generated which showed phase as well as the amplitude information. The phase information from two and more interferogram further used to extract information about height and displacement of the surface. We used this technique to derived glacier velocity for Potsdam glacier which is located south of the Schirmacher oasis and north of Wohlthat Massif, east Antarctica, using Sentinel-1 Single Look Complex images captured in Interferometric Wide mode. For velocity estimation, Persistent Scatterer interferometry (PS-InSAR) method was applied. This method uses time coherent of permanent pixel of master images and correlates to same pixel of the slave image to get displacement. C-band sensor of European Space Agency, Sentinel-1A and 1B data were used in this study. Estimated average velocity was around 0.12 m/day, which varied annually from 30 to 60 m. The velocity varied by about 30-35 m/yr at higher elevation to 55-60 m/yr at lower elevation of the Potsdam glacier.