As the Shanghai downtown construction-intensive, complex terrain, has been the focus of three-dimensional modeling and difficult.

由于上海中心城区建筑密集，地形复杂，一直是三维建模的重点和难点。

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This paper introduced the modeling process and realization method and terrain simplification of the freeway three-dimensional scene.

文中介绍了高等级公路三维视景的建模过程、实现方法，以及地形的简化技术。

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Three dimensional strata model, constructed by the published modeling approaches, is inconsistent to the terrain.

目前三维地层表面建模方法构建的三维地层模型上表面粗糙，与地形不一致。

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