DEM Generation And 3-D Deformation In Grove Mountains,East Antarctica

The high resolution and precision digital elevation model(DEM)is the basis of the Antarctic scientific research tasks and an important reference for the Antarctic ice sheet's mass balance research.However,The current Antarctic DEMs does not meet the needs with regard to resolution and precision in the edge and steep regions.The research on the glacial ice movement is not only important for the study of mass balance and environmental change in the Antarctica,but also the reference data for the investigation of the Antarctic inland and the site inspections of research station.With the maturity of earth observation technology and the development of remote sensing technology,it is possible to obtain Antarctic topographic data and ice movement on a large scale,which also promotes the related research on the generation of DEM and ice movement in Antarctica.Based on Synthetic Aperture Radar(SAR)technology and altimetry technology,this paper uses the baseline combined Synthetic Aperture Interference(BC-InSAR)and interferometrioc swath processing of CryoSat-2 L1 b data to generate DEM in Grove Mountains,one of the key areas of the country's scientific expedition to Antarctica.In addition,the differential InSAR(D-InSAR)and multi-aperture InSAR(MAI)methods are used to analyze the three-dimensional movement in this area.The main research contents and results obtained are as follows:(1)Based on the Sentinel-1 A/B IW mode data,the DEM was generated in study area using the baseline combined method,and the product precision was analyzed.At the same time,it is concluded that under the premise of ensuring good coherence,the greater the difference of vertical baseline,the better the precision of the final DEM.(2)Based on the CryoSat-2 L1 b SARIn mode data,the interferometrioc swath processing method is used to generate the DEM in Grove Mountains,and the product precision is analyzed.Compared with the L2 elevation footprints released by ESA,the elevation footprints results obtained by this method have two orders of magnitude improvement in quantity.The roll angle correction was performed for the CryoSat-2 baseline C data with respect to the satellite attitude error.(3)Based on the Beer–Lambert law and related research,combined with the reanalysis data in study area,the microwave penetration model was used to evaluated the penetration impact of the CryoSat-2 Ku band and Sentinel-1 C band in the Grove mountains area.(4)Combining D-InSAR and MAI techniques to extract the displacements of the two direction(line of sight(LOS)and azimuth(Azimuth))in study area,respectively.The geometry model is used to extract the three-dimensional movement in this area.2-D velocity and elevation changes were further calculated based on the three-dimensional movement field.