Road surface model is basis of highway three dimension design, the key is the overlaid compute of design model and terrain model.
公路三维表面模型是公路三维设计的基础，其关键是设计模型和地表模型的叠加运算。
Digital Elevation model (DEM) is a common model of three dimension terrain, and digital analysis is mainly based on DEM.
在三维地形有关的数字分析中，地表面积是经常用到的数据。
The authors set up the road and terrain model with CDT theory, and transform it into mesh model and show the three-dimension view.
采用CDT理论建立道路与地形整体模型，并转化成格网模型进行三维显示；
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