1.Digital Terrain Model display two demission geographic position and relational properts information with digital pattern. DTM is an important component of Gis,and is basic of "digital earth".
数字地面模型(Digital Terrain Model,DTM)是地表二维地理空间位置和其相关的地表属性信息的数字化表现,是地理信息系统(Geographic Information System,GIS)的重要组成部分,是数字地球的基础。