本文在分析GIS、CAD以及通用出版软件数据模型的基础上提出了面向地图出版的数据模型，具体包括几何对象模型、地图模型和拓扑模型以及它们的数据库存储方案。
The data model is drive from the analysis of the data model of GIS , CAD and DTP system. It include the geometry model, the map model, the topology model and their database schema.
通过对模型轮廓曲线及表面的几何特性分析，编辑对象，从而达到对设计进行优化的目的。
Through geometrical feature analysis of curve and face of model outline, editing object, thus receiving purpose of optimization design.
以某地铁标段施工的土压平衡盾构机为研究对象，建立了盾构密封舱土压力系统离散元仿真的几何模型；
Taking the shield machine tunneling in a subway section as the research object, the DEM geometrical model for analyzing the chamber pressure of the shield machine is established.
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