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文章简要介绍了公路工程三维模型系统的功能、开发环境、应用情况，阐述了数字地面模型技术在建立路线、互通立交三维模型的作用，以及实现的方法。
The paper briefly introduces the function, development environment and application of 3D model system of highway engineering. It also expounds the function of digital terrain model in building 3D model of route and interoperability and the method of realization.