As one of frame data of National Spatial Data Infrastructure , Digital Elevation Model excels contour line. it can express continuous gurgitation of ground, and it can also carry out relevant mathematical analyses and imitation, so it is applied broadly in various fields at present. Large-scale Digital Elevation Model is foundation of spatial information in CyberCity and provides a great deal of information for 2D map and 3D model of CyberCity, and it provides a kind of efficient method to manag...