Static GPS measurements in the vicinity of EDML and an elevation model for Dronning Maud Land

The knowledge of ice sheet surface topography and the location of the ice divides are essential for ice dynamic modeling. An improved digital elevation model (DEM) of Dronning Maud Land (DML), Antarctica, is presented in this paper. It is based on ground-based kinematic GPS profiles, airborne radar altimetry, and data of the airborne radio-echo sounding system, as well as spaceborne laser altimetry from NASA's Ice, Cloud and land Elevation Satellite (ICESat). The accuracy of ICESat ice sheet altimetry data in the area of investigation is discussed. The location of the ice divides is derived from aspect calculation of the topography and is verified with several velocity data derived from repeated static GPS measurements.

冰盖表面地形知识及其冰分界线位置对于冰动力学模型构建至关重要。本文提出了一种改进的南极洲德隆女王地（DML）数字高程模型（DEM）。该模型基于地面基于运动的GPS剖面、机载雷达高程测量、机载无线电回波探测系统数据以及美国国家航空航天局（NASA）的冰、云和地表高程卫星（ICESat）的空基激光高程测量。讨论了研究区域ICESat冰盖高程数据的精度。冰分界线的位置通过地形坡向计算得出，并经多次静态GPS测量的速度数据验证。