数码校园GIS中的三维建模

3D Modeling in 3D Geographical Information System

为满足“数字地球”时代的发展要求 ,地理信息系统 (GeographicInformationSystem ,GIS)必须把三维世界真实地表达出来 ,因此如何更有效地获取地球上的各种信息是个关键问题。在此以清华大学三维景观的建立为例 ,利用数字摄影测量技术对地面模型及地物进行三维建模 ,对于不能直接从航片上获取的复杂地物 ,则采用 3DGIS软件进行单个模型的建立 ,通过这种建模方式的结合 ,可大大节省实现三维可视化的时间。实践证明 ,这种建模方法的效果令人满意 ,不仅是一种快速有效的建模方法 ,而且更新也很方便 。

In order to meet the requirements of building digital earth,3D information must be included in GIS and to show real 3D world a critical problem of technique which needs to be solved is how to visualize real 3D world.In view of 3D scene of Tsinghua University,terrain model and regular objects are built by using digital photogrammetric system,and complicated object built by Auto CAD,3DS,3DMAX or 3DGIS.The result proved that this method is not only fast and efficient,but also convenient for updating the data in future,especially for large area.