Digital Elevation Models（ DEMs） for Antarctica are critical datasets for general circulation models

change analysis of ice sheet dynamics and logistical planning of field expeditions. To date

there are five different DEMs covering all of Antarctica

all of which were derived from satellite radar or laser altimetry data in combination with ground data. Since the margins of ice sheets are highly dynamic in space and time

DEMs of Antarctica should be updated frequently as new data become available. We used Radar Altimeter（ RA-2） data from Envisat and laser altimeter（ GLAS） data from ICESat to create an up-to-date DEM of Antarctica with high accuracy and precision of elevation measurement. In this paper

these two different sources of satellite altimeter data from 2003 to 2009 were integrated to generate a DEM for the entire continent of Antarctica. We applied five different quality judgment rules to filter unreliable ICESat / GLAS data; as a result

8. 36% of the data were filtered out. A relative correction method based on speckle geometry intersection was used to correct Envisat RA-2 elevations to ICESat / GLAS. The data were interpolated to a regular 1000 m polar stereographic grid using ordinary Kriging after semi-variance analysis. The accuracy of the final DEM was a ssessed through a comparison with two airborne LiDAR datasets

a field GPS strip from China’s Zhongshan Station to Dome A and the most recently published DEM. The comparison result shows that the error of the new DEM is from 3. 21 m to 27. 84 m

and the distribution of errors depends on the surface slope. The new DEM shows an obvious improvement on steep slopes

including the quickly changing ice sheet margin areas.