Comparison of Antarctic Ice sheet elevation between ICESat GLAS and InSAR DEM

In this study we used two kinds of SAR Interferometry (InSAR) analysis and its applications for Antarctic ice sheet research. We extracted grounding line along with the Antarctic coastal zone from 80 degrees W to 160 degrees W using ERS-1/2 tandem data. The grounding line extracted from InSAR compared with conventional one stored in Antarctic Digital Database (ADD). Grounding line delineated by InSAIR showed extremely detailed features as compared with ADD' s cone. This result revealed that InSAR is a practical tool for the detection of grounding lines. We also compared ice sheet elevation from ICESat GLAS (Geoscience Laser Altimetry System) data to InSAR DEM. The comparison result showed that elevation values derived by InSAR DEM have insufficient height accuracy compared to GLAS data due to ice flow appeared in the fringe pattern and difficulty of phase unwrapping. To apply operational comparison with GLAS data, we need to improve InSAR DEM to take account with the effect of ice flow appeared in the fringe pattern.