Digital Elevation Model ( DEM ) is one of the important parts of the geographic information systems, which has a wide range of applications in terrain analysis, constructing project, emulating battlefield environment and many other fields. 数字高程模型(DEM)作为空间信息系统的重要组成部分,在地学分析,工程建设、战场环境仿真等许多领域有着广泛的应用。