Terrain is the carrier of Virtual Geographic Environment(VGE).

地形是虚拟地理环境的承载体。

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And with the demonstrational geographic elements of road and forest, the road design is realized and the constructional method of virtual forest environment is mentioned based on TIN.

并以道路和森林为示范地理要素，初步实现了基于TIN的道路设计，并提出了基于TIN的虚拟森林环境的构建方法。

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And with the demonstrational geographic elements of road and forest, the road design is realized and the constructional method of virtual forest environment is mentioned based on TIN.

并以道路和森林为示范地理要素，初步实现了基于TIN的道路设计，并提出了基于TIN的虚拟森林环境的构建方法。

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