In view of the situation that there are errors in navigation data and digitalterraindata, the robustness of reference path is ensured according to choice the cell width of search space properly.
针对导航系统精度和数字地图存在误差的情况，通过适当划分搜索空间网格保证了航迹的鲁棒性。
2
As the data base of the GIS digitalterrain analysis, digital Elevation Model (DEM) contains rich of terrain, topography and related geo-information and knowledge.
Generation of triangular meshes for digitalterrain model is studied, the triangulation algorithm of discrete points and edges and its data structure are presented.